[置顶] 开发笔记

1. 颜色值计算

2. 逆向助手反编译，apktool, jd-gui,dex2jar-0.0.9.15

3. 设置图片底色: ImageView.setColorFilter()

4. 打log

StackTraceElement st[] = Thread.currentThread().getStackTrace();

for (int i = 0; i < st.length; i++) {

android.util.Log.i("silion", "trace: " + st[i].toString());

}

android.util.Log.i("silion", "--------boundary--------");

5. 卡顿时，连续onClick，同时add多个Fragment

FragmentTransaction.commitAllowingStateLoss();

FragmentManager.executePendingTransactions();

6. 文字带下划线

Strings

 
<resources>
    <string name="hello"><u>phone: 1390123456</u></string>
    <string name="app_name">MyLink</string>
</resources>

Code

TextView textView = (TextView)findViewById(R.id.testView); 
textView.setText(Html.fromHtml("<u>"+"hahaha"+"</u>"));

7. EditText 去掉下划线

android：background="@null"

8. String添加文字

<string name="hello">你好，我是%1$s。</string>

String.format(context.getString(R.id.hello), "silion")

9. 判断字符串是否为空(去掉首尾空格)

TextUtils.isEmpty(string.trim())

10. String中的部分文字设置成超链接

a. strings.xml

<string name="silion_blog">这是<a href = "http://blog.csdn.net/xilove102">silion</a>的博客</string>

b. java中实现

TextView hyperlinkTextView = new TextView(this);
hyperlinkTextView.setText(Html.fromHtml(getResources().getString(R.string.silion_blog)));
hyperlinkTextView.setMovementMethod(LinkMovementMethod.getInstance());

11. 隐藏输入法

InputMethodManager imm = (InputMethodManager) this.getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm != null) {
    imm.hideSoftInputFromWindow(hyperlinkTextView.getWindowToken(), 0);
}

12. 自定义ListView divider

drawable/divider_listitem.xml

<insert xmlns:android=“http://schemas.android.com/apk/res/android"
    android:insert="0dp">

    <shape android:shape="rectangle">
        <solid android:color="@color/ca" />
    </shape>
</insert>

布局

<ListView
    android:id="@+id/listView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:divider="@drawable/divider_listitem"
    android:dividerHeight="2px" />

13. Android API Level 8及其以上Android系统提供了为应用程序数据的备份和恢复功能

android:allowBackup="true"

14. Call requires API level 18 (current min is 14):类似异常解决

15. actionLink to URI

        Log.d(TAG, "performActionLink, actionLink = " + "voc://view/main");

        URI uri = null;
        try {
            uri = new URI(actionLink.trim());
        } catch (URISyntaxException e) {
            Log.e(TAG, e.getMessage(), e);
        }
        if (uri == null) {
            return;
        }

        String scheme = uri.getScheme() != null ? uri.getScheme() : "";
        String function = uri.getHost() != null ? uri.getHost() : "";
        String path = uri.getPath() != null ? uri.getPath() : "";
        if (path.length() > 1) {
            path = path.substring(1);
        }

16. 字符串格式化String.format()

res\valuse\strings.xml

    <string name="string_format">字符串格式化 数字：%1$d</string>

MainFragment.java

                titleTextView.setText(String.format(mMainActivity.getString(R.string.string_format), 0));

17. 定时重复执行 Timer() and TimerTask

            mViewPagerScrollTimer = new Timer();
            mViewPagerScrollTimer.scheduleAtFixedRate(new TimerTask() {
                @Override
                public void run() {
                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            int i = mHeaderViewPager.getCurrentItem() + 1;
                            if (i >= mHeaderViewPagerAdapter.getCount()) {
                                i = 0;
                            }

                            android.util.Log.v("slong.liang", "set current item = " + i);
                            mHeaderViewPager.setCurrentItem(i);
                            if (i == 0) {
                                //TODO changeNormalHeaderImage();
                            }
                        }
                    });
                }
            }, 5000, 5000);

18. 字符串编码转换

new String(str.getBytes("iso8859-1"), "utf-8")

19.URL编码

URLEncode.encode(str, "UTF-8")