转载Android常见问题

1. R.java消失或解析异常

查看res中资源文件，图片，xml等。比如图片文件名不能有大写不能有空格。 
搞定错误之后Project->clean就可以了。

1. 自定义title栏。 
   首先要z在values->styles中定义一个style，然后在mainfest文件中设置android:theme. 
   最后在Activity中按照这个顺序写： 
   super.onCreate(savedInstanceState); 
   requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
   setContentView(R.layout.activity_main); 
   getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title_layout);

2. SQLite isFirst和isBeforeFirst方法的区别： 
   看下面一段代码 
   Cursor c = queryTheCursor(type); 
   if(c.moveToLast()) 
   while (!c.isBeforeFirst()) { 
   String tmpContent = new String(); 
   tmpContent = c.getString(c.getColumnIndex(“content”)); 
   contents.add(tmpContent); 
   c.moveToPrevious(); 
   } 
   c.close(); 
   代码的作用是逆序输出表中的内容，第三行如果用的是isFirst（）的话就无法输出第一行，正确做发是用isBeforeFirst（）。

3. eclipse删除空行 
   在eclipse中删除某一行就用ctrl+D快捷键。如果你想删除一个文件中的所有空行呢。 
   可以用下面方法。

1)打开源码编辑器 
2)使用快捷键Ctrl+f 
3)在Find输入框中输入：^\s*\n 
4)Replace With输入框的值为空 
5)在【Options】选中的”Regular expressions” 
6)点击【Replace All】按钮。 
7)OK!

1. getX()和getRawX（）的区别 
   getX()是表示Widget相对于自身左上角的x坐标 
   而getRawX()是表示相对于屏幕左上角的x坐标值(注意:这个屏幕左上角是手机屏幕左上角,不管activity是否有titleBar或是否全屏幕),getY(),getRawY()一样的道理

2. imagView居中显示问题 
   xml设置如下：

<code class="hljs xml has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-pi" style="color: rgb(0, 102, 102); box-sizing: border-box;"><?xml version="1.0" encoding="utf-8"?></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">LinearLayout</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">xmlns:android</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://schemas.android.com/apk/res/android"</span>     <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_width</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"fill_parent"</span>     <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_height</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"wrap_content"</span>     <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_gravity</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"center"</span>     <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:orientation</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"vertical"</span> ></span>     <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">ImageView</span>         <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_width</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"wrap_content"</span>     <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_height</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"wrap_content"</span>         <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:id</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@+id/myImageView"</span>         <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_gravity</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"center"</span>         <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:scaleType</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"matrix"</span>         <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:src</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@drawable/pic"</span> ></span>     <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">ImageView</span>></span>
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

1. synchronized引发了 java.util.ConcurrentModificationException

   如果多个线程同时访问一个 ArrayList 实例，而其中至少一个线程从结构上修改了列表，那么它必须 保持外部同步。
   

   解决方法：初始化的时候 将ArrayList改为CopyOnWriteArrayList；

   原理：JAVA中将引用从一个对象移到另外一个对象不需要消耗CPU时间，可以看做是一个原子操作。 
   JAVA中如果一个对象仍旧存在引用，则不会被CG回收。 
   CopyOnWriteArrayList就是根据以上两个特点，在列表有更新时直接将原有的列表复制一份，并再新的列表上进行更新操作，完成后再将引用移到新的列表上。旧列表如果仍在使用中(比如遍历)则继续有效。如此一来就不会出现修改了正在使用的对象的情况(读和写分别发生在两个对象上)，同时读操作也不必等待写操作的完成，免去了锁的使用加快了读取速度。

2. 获取随机颜色 
   并不用每次都生成三个随机数，下面两条语句就可以了： 
   Random myRandom=new Random(); 
   int ranColor = 0xff000000 | mRandom.nextInt(0x00ffffff);

3. 去掉Activity的标题栏，全屏显示 
   在manifest文件中修改对应的Avtivity属性。 
   android:theme=”@android:style/Theme.NoTitleBar.Fullscreen”

4. 如何修改应用名称及应用图标 
   修改程序的图标，修改drawable文件夹的i→→c_launcher.png图标，把新的图标改名覆盖就可以了。 
   如果你要自己的名称，可以修改AndroidManifest.xml的这个节点，application android:icon=”@drawable/ic_launcher”，不需要加文件扩展名。 
   即使这么做了，真机调试的时候可能还是会有一些问题，比如图标没办法改变，这个时候就需要在Eclipse中新建一个不同名的项目，然后转移代码（有点小麻烦～_～!）。

5. 关于调试方法 
   调试的时候程序如果出错，一般是查看logcat，看error发生的地方，会提示在程序的第几行，然后去找就可以了。 
   但有些错误没办法定位，那就把日志输出成txt，然后去google，baidu吧。

6. Couldn’t read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. 
   错误1：请求的字段在数据库的表中不存在，一般是大小写没写对； 
   错误2：编程的中途改变表的字段，实际字段并没有改变，解决方法是卸载当前版本，再安装调试。

7. android.content.res.Resources.loadXmlResourceParser 
   在传递string类做参数的地方传了int形变量。

8. android.content.res.Resources$NotFoundException 
   出现此类异常时，可以根据 Resource ID到资源类R中找相关的资源。比如0x7f030000，对应的是city_item布局文件，就可以将问题缩小到更小的范围。对于这类运行时找不到资源，但资源又确实存在的问题，可能的编译打包时出现问题，没有将该资源加入。可修改一下该资源，让编译器重新编译。 
   还有试一下Project ->Clean一下这个项目 也可以的。

9. 交互性的button定义的方法： 
   首先是准备好按钮不同状态的图片 
   然后 在res/drawable中定义selector的xml文件

<code class="hljs xml has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-pi" style="color: rgb(0, 102, 102); box-sizing: border-box;"><?xml version="1.0" encoding="utf-8"?></span>
<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">selector</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">xmlns:android</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://schemas.android.com/apk/res/android"</span>></span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"><!-- 定义按钮点击时的图片 --></span>
    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">item</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:drawable</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@drawable/addbtn_focus"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:state_pressed</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"true"</span>/></span>
    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"><!-- 定义按钮默认的图片 --></span>
    <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">item</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:drawable</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@drawable/addbtn_lost"</span>/></span>


<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">selector</span>></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

最后Button的background属性中设置

<code class="hljs xml has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">Button
</span>            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:id</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@+id/btnAdd"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_width</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"wrap_content"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_height</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"wrap_content"</span>
            <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:background</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@drawable/addbtn_selector"</span>/></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

1. 在超级终端中执行程序报错-Permission deny 
   参照http://android.stackexchange.com/questions/16814/terminal-permission-denied-need-more-info-on-error-message 
   主要原因是不能在sdcard中执行，直接进入data/目录下面创建文件，然后执行就可以了。

2. 从svn导入工程项目有惊叹号 
   错误提示 
   Archive for required library: ‘libs/armeabi/libvudroid.so’ in project ‘DocumentViewer’ cannot be read or is not a valid ZIP file 
   主要是路径出了问题 
   解决方法：在project的build-path将外部包（库）的引用删掉就可以了。

3. 首次进入带有EditText的Activity不自动弹出软键盘，再次点击才弹出。 
   只有设置manifest的方法有用，在activity的设置中添加： 
   android:windowSoftInputMode=”adjustPan|stateHidden”

4. Gallery中OnItemClickListener与OnItemSelectedListener的区别 
   OnItemClickListener：只有单击Gallery中的View才会触发事件，准确的说是当点击之后抬起手的时候触发，滑动不会触发。 
   OnItemSelectedListener：当Gallery中的View被选中的时候就会触发，Galler初次显示就会触发一次，选中第一个iew，滑动和单击都会触发。 
   20.从16进制中提取颜色的rgb分量。 
   主要就是通过位运算来实现。

<code class="hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> Main {
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">main</span>(String[] args) {
        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// TODO Auto-generated method stub</span>
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> INK_COLOR = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0xFF11ef23</span>;
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> r = getColorR(INK_COLOR );
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> g = getColorG(INK_COLOR );
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> b = getColorB(INK_COLOR );
        System.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span>.print(r+<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">" "</span>+g+<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">" "</span>+b);

    }

    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> <span class="hljs-title" style="box-sizing: border-box;">getColorR</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> c)
    {
         <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> R = (c & <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x00FF0000</span> )>><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>;
         <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span>) (R/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">255.0</span>);
    }

    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> <span class="hljs-title" style="box-sizing: border-box;">getColorG</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> c)
    {

         <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> G =(c & <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x0000FF00</span> )>><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span>;
         <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span>) (G/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">255.0</span>);
    }

    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> <span class="hljs-title" style="box-sizing: border-box;">getColorB</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> c)
    {

         <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> B = c & <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x000000FF</span>;
         <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span>) (B/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">255.0</span>);
    }

}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li></ul>

1. Eclipse中签名导出apk崩溃，手动签名。 
   工程没问题，调试也没问题，但打包的时候eclipse会崩溃，解决方法是手动打包。 
   首先去工程目录下的bin文件夹下找到apk文件，解压后删除META-INF文件夹，重新打包成压缩包，改后缀名为.apk 
   首先是签名（假设你已经在根目录下生产了密钥keystore）： 
   进入java安装目录/bin文件夹下： 
   ./jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore android.keystore ~/Output.apk android

然后是优化，进入sdk的tools文件夹下，运行。 
./zipalign -v 4 ~/Output.apk Output_realase.apk

当前目录下Output_realase.apk就是打包签名好的apk了。

1. android.view.InflateException: Binary XML file line #异常的解决 
   创建自定义view的时候，碰到 android.view.InflateException: Binary XML file line #异常，反复研究

后发现是缺少一个构造器造成。

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-title" style="box-sizing: border-box;">MyView</span>(Context context,AttributeSet paramAttributeSet)
{
      <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>(context,paramAttributeSet);
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>

补齐这个构造器，异常就消失了.

1. 将assets文件夹中的压缩包拷贝到sdcard中（不限大小）

<code class="hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">copyAssetToSdcard</span>(Context c, String assetFile, String destination) throws IOException {  
        InputStream <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> = c.getAssets().open(assetFile);  
        File outFile = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(destination);
        OutputStream <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span>;  
        Log.v(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Try"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Try coping."</span>);
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> {
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(destination)).exists()) {
                Log.v(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Try"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Not exists.."</span>);
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> FileOutputStream(outFile);
                copyFile(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span>, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span>);
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span>.close();
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span>.flush();
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span>.close();
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
            }
        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (Exception e) {
            Log.v(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Error"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Error in if。"</span>);
        }

    }  

    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">copyFile</span>(InputStream <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span>, OutputStream <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span>) throws IOException {
        Log.v(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Coping"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"copyFiling."</span>);
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">byte</span>[] buffer = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">byte</span>[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1024</span>];
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> read;
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> ((read = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span>.read(buffer)) != -<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>) {
            Log.v(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"read:"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">""</span> + read);
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">out</span>.write(buffer, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, read);
        }
    }
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li></ul>

1. 判断是否有root权限

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">synchronized</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">boolean</span> <span class="hljs-title" style="box-sizing: border-box;">getRootAhth</span>()
    {
        Process process = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
        DataOutputStream os = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>
        {
            process = Runtime.getRuntime().exec(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"su"</span>);
            os = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> DataOutputStream(process.getOutputStream());
            os.writeBytes(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"exit\n"</span>);
            os.flush();
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> exitValue = process.waitFor();
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (exitValue == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)
            {
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>;
            } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>
            {
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>;
            }
        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (Exception e)
        {
            Log.d(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"*** DEBUG ***"</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Unexpected error - Here is what I know: "</span>
                    + e.getMessage());
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>;
        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">finally</span>
        {
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span>
            {
                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (os != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>)
                {
                    os.close();
                }
                process.destroy();
            } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (Exception e)
            {
                e.printStackTrace();
            }
        }
    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li></ul>

1. 最简单的Root 模拟器的方法 
   启动一个模拟器，开始-运行-输入cmd，打开dos，依次输入 
   adb shell 
   mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system 
   cd /system/bin 
   cat sh > su 
   chmod 4755 su 
   su 
   即可获得root权限

2. 新版ADT开启eclipse提示 “Running Android Lint” has encountered a problem 
   进Eclipse，Window > Preferences > Android > Lint Error Checking, u去掉 “When saving files check for errors”的勾。

3. 新版ADT开启eclipse提示 cannot open libstdc++.so.6.. 
   要安装32位的库。 
   sudo apt-get install lib32stdc++6 
   sudo apt-get install lib32z1

4. 无法升级ADT

<code class="hljs applescript has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">I want <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">to</span> install ADT plugin <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> Eclipse <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> Zip <span class="hljs-type" style="box-sizing: border-box;">file</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">but</span> when i click <span class="hljs-function_start" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">on</span></span> next button <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">first</span> page <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">of</span> install, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">the</span> progress late long <span class="hljs-property" style="box-sizing: border-box;">time</span>. I wait <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">around</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>hours <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">that</span> i wait <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> install <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">but</span> now half ADT install :(

In install window, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">above</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">of</span> progress bar, writes: cannot perform operation.Computing alternate solutions, may take a <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span>: <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span> .

Why <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">to</span> install ADT needs a long <span class="hljs-property" style="box-sizing: border-box;">time</span>? Is this no problem <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">or</span> install has a problem?

sorry <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">my</span> poor english <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> Thanks <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> help</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

由于官方对android开发的ide主推Android Studio，对eclipse也就少了很多，ADT-bundle也停止了更新，所以出现了上面的问题。 
解决方法是从Eclipse官网下载最新版本的Eclipse，最新版的ADT插件。