安卓开发中遇到的奇奇怪怪的问题
写这篇文章属于脑中一闪的一个念头，是想着把自己做项目中遇到的一些奇怪问题和解决办法分享出来。因为是现想，所以想到一个在更新一个吧。可能有理解错误的地方，望指出。
1.App的首次安装。
问题描述：在我们安装完成一个app时，在安装界面直接点击打开。我们进入了app的首页，这时我们按home键返回桌面，再点击应用图标，会发现没有直接进入首页，而是先进入了app的闪屏页，在进入首页。重复这一步一直如此。这时我们按back键返回，发现没有直接退回桌面，而是返回到之前打开的多个首页。但是如果一开始安装完我们不是直接打开，而是在桌面点击应用进入就不会这样了。
奇奇怪怪~~
记得当时我在应用市场下载了部分应用，也有一些有同样的问题。但是有些虽然重复打开，但双击退出程序将整个重复打开的关闭了。这确实也是一种方法，但是觉得不是最合理。
解决方法：
- https://code.google.com/p/android/issues/detail?id=2373#c40
- http://stackoverflow.com/questions/3042420/home-key-press-behaviour/4782423#4782423
我贴一下代码
if (!isTaskRoot()) {
Intent intent = getIntent();
String action = intent.getAction();
if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) && action != null && action.equals(Intent.ACTION_MAIN)) {
finish();
return;
}
}2.Android自定义CheckBox
问题描述：曾经写过一个自定义CheckBox，结果运行在4.1的手机上消失不见了。。。你说郁闷不。写法如下：
<CheckBox
android:id="@+id/check_box"
style="@style/MyCheckBox"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
<style name="MyCheckBox" parent="Widget.AppCompat.CompoundButton.CheckBox">
<item name="android:button">@drawable/checkbox_selector
style>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/icon_on" android:state_checked="true"/>
<item android:drawable="@drawable/icon_off" android:state_checked="false"/>
selector>写法没有什么问题吧，但是就是不显示，凭空消失。当然如果我加上文字，就出来了，但是文字图片重叠。。。
最后谷歌出了原因：大致是说4.1.2版本中CompoundButton没有getCompoundPaddingXX。两个版本的计算方式不一样，4.1.2以上版本绘制文字时，会把图片的宽度和paddingXX的宽度加上，而4.1.2版本只计算设置的paddingLeft。
知道了原因，解决方法：
3. RecyclerView Bug
问题描述：这个是在友盟的错误分析中报的，错误信息如下：
java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid view holder adapter positionViewHolder{42fb7f40 position=11 id=-1, oldPos=-1, pLpos:-1 no parent}
at android.support.v7.widget.RecyclerView$Recycler.validateViewHolderForOffsetPosition(RecyclerView.java:4801)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4932)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4913)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
at android.support.v7.widget.LinearLayoutManager.scrollBy(LinearLayoutManager.java:1193)
at android.support.v7.widget.LinearLayoutManager.scrollVerticallyBy(LinearLayoutManager.java:1043)
at android.support.v7.widget.RecyclerView.scrollByInternal(RecyclerView.java:1552)
at android.support.v7.widget.RecyclerView.onTouchEvent(RecyclerView.java:2649)
at android.view.View.dispatchTouchEvent(View.java:7706)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2224)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1954)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2230)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1968)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2230)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1968)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2230)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1968)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2230)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1968)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2230)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1968)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2230)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1968)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2074)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1521)
at android.app.Activity.dispatchTouchEvent(Activity.java:2569)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2022)
at android.view.View.dispatchPointerEvent(View.java:7886)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3967)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3846)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3412)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3462)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3431)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3538)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3439)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3595)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3412)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3462)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3431)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3439)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3412)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5552)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5532)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5503)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5632)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)
at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5605)
at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5651)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:542)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5162)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)从上面可以看到并没有报到我们自己的代码里面来，这就很尴尬了。老办法谷歌，找到了Drakeet大神的一篇博客，说到了我的心坎里。
重现的方法是：使用 RecyclerView 加官方下拉刷新的时候，如果绑定的 List 对象在更新数据之前进行了 clear，而这时用户紧接着迅速上滑 RV，就会造成崩溃，而且异常不会报到你的代码上，属于RV内部错误。初次猜测是，当你 clear 了 list 之后，这时迅速上滑，而新数据还没到来，导致 RV 要更新加载下面的 Item 时候，找不到数据源了，造成 crash.
真是一样一样的，那么解决方法大神也提供了，就是在刷新，也就是 clear 的同时，让 RecyclerView 暂时不能够滑动，之后再允许滑动即可。代码就是在 RecyclerView 初始化的时候加上是否在刷新进而拦截手势：
mRecyclerView.setOnTouchListener(
new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (mIsRefreshing) {
return true;
} else {
return false;
}
}
}
);当然如果觉得刷新时不能滑动可以用这种方案：
public class WrapContentLinearLayoutManager extends LinearLayoutManager {
//... constructor
@Override
public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
try {
super.onLayoutChildren(recycler, state);
} catch (IndexOutOfBoundsException e) {
Log.e("probe", "meet a IOOBE in RecyclerView");
}
}
}使用：
RecyclerView recyclerView = (RecyclerView)findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new WrapContentLinearLayoutManager(activity, LinearLayoutManager.HORIZONTAL, false));补充：但是这里要注意的是，禁止 RecycleView “下拉刷新” 和 “加载更多” 同时执行 。否则会报：
java.lang.IllegalStateException: Added View has RecyclerView as parent but view is not a real child. Unfiltered index:0
at android.support.v7.widget.RecyclerView$LayoutManager.addViewInt(RecyclerView.java:7048)
at android.support.v7.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:7012)
at android.support.v7.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:7000)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1428)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578)
at com.jingzhao.shopping.customview.WrapContentLinearLayoutManager.onLayoutChildren(WrapContentLinearLayoutManager.java:27)<---这里
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3260)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3069)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3518)
at android.view.View.layout(View.java:15697)
at android.view.ViewGroup.layout(ViewGroup.java:5050)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077)
at android.view.View.layout(View.java:15697)
at android.view.ViewGroup.layout(ViewGroup.java:5050)
at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:598)
at android.view.View.layout(View.java:15697)
at android.view.ViewGroup.layout(ViewGroup.java:5050)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1692)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1468)
at android.view.View.layout(View.java:15697)
at android.view.ViewGroup.layout(ViewGroup.java:5050)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077)
at android.view.View.layout(View.java:15697)
at android.view.ViewGroup.layout(ViewGroup.java:5050)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15697)
at android.view.ViewGroup.layout(ViewGroup.java:5050)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15697)
at android.view.ViewGroup.layout(ViewGroup.java:5050)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15697)
at android.view.ViewGroup.layout(ViewGroup.java:5050)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2232)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1984)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1163)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6190)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:773)
at android.view.Choreographer.doCallbacks(Choreographer.java:586)
at android.view.Choreographer.doFrame(Choreographer.java:556)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:759)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:159)
at android.app.ActivityThread.main(ActivityThread.java:5540)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:964)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759)可以做类似的处理：
if(swipeRefreshLayout.isRefreshing()){
return;
}4.华为部分设备不打印Log
部分的华为设备工程模式下log是关闭的
1.如果是华为手机，进入拨号界面输入：*#*#2846579#*#*进入页面设置。
2.如果是华为pad，进入计算器输入：()()2846579()()= 进入页面设置。
5.一些注意点
（1）平时为了给apk瘦身，我们会对图片进行有损或无损的压缩。那我平时有用到的一个有损压缩网站tinypng，但是切记我们的9图不要压缩，不然会有问题。（这里顺便分享一个做9图的在线工具http://inloop.github.io/shadow4android/）
（2）Android的透明主题需谨慎使用。
（3）for循环不要把获得数量的代码写在循环当中：for(int i = 0; i <= list.size(); i ++)
（4）ListView的如果其宽度或高度被设置为wrap_content，会有性能等问题。参见：http://stackoverflow.com/questions/4270278/layout-width-of-a-listview
暂时就想起这么多了，码字不易，多多点赞。