小编Pha*_*at7的帖子

我已经学习Java一段时间了,还在学习新的语法技巧和东西.我在Android源代码中遇到过这个:

boolean retry = id == 1;

这是什么意思？

我正在尝试为containerLinearLayout(20dp)和btn按钮(20dp)设置动画(向右移动它们),但它们会在mainLinearLayout(40dp)的整个宽度之后被剪切.我试过clipChildren="false"这两个,但它不起作用.我不能使用match_parent尺寸布局,因为它是一个叠加应用程序,将阻止后面的触摸.

有任何想法吗？

我的布局:

<LinearLayout
    android:id="@+id/main"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:clipChildren="false"
    android:clipToPadding="false" >

    <LinearLayout
        android:id="@+id/container"
        android:layout_width="20dp"
        android:layout_height="80dp"
        android:clipChildren="false"
        android:clipToPadding="false" >        
    </LinearLayout>

    <ImageButton
        android:id="@+id/btn"
        android:layout_width="20dp"
        android:layout_height="80dp"
        android:padding="0dp"
        android:background="@drawable/btn" />

</LinearLayout>

我的(简化)代码:

super.onCreate();       
windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
params = new WindowManager.LayoutParams(
    LayoutParams.WRAP_CONTENT, //can't have MATCH_PARENT
    LayoutParams.WRAP_CONTENT, //can't have MATCH_PARENT
    WindowManager.LayoutParams.TYPE_SYSTEM_ALERT | 
    WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
    WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
    PixelFormat.TRANSLUCENT);

LayoutInflater inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
main = (LinearLayout) inflater.inflate(R.layout.main,null);

btn = (ImageButton)main.findViewById(R.id.btn);
container = (LinearLayout)main.findViewById(R.id.container);
btn.setOnClickListener(onClickListener);        
windowManager.addView(main, params);
}

动画代码: …

我知道服务无法实现Back按键,我理解其基本原理.但是有一个名为SideBar 的应用程序(在Play商店中)会对后退按键做出反应.这是一种将视图添加为系统覆盖的服务,并在按下后退键时删除视图.谁能解释一下这是怎么做到的？

这是另一个做得很好的应用程序.我已经搜索过网络,但还没有找到解决这个问题的方法.有任何想法吗？

最近,我的十个构建中有九个因以下异常而失败.我清理并重建项目,但无济于事.我到处搜索并尝试在其他类似问题上分享的解决方案 - 再次没有帮助.我的Android Studio版本是2.0 Beta 5,Gradle也是2.0.0-beta5.以下是我收到的例外情况:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformClassesWithDexForDebug'.
> com.android.build.api.transform.TransformException: java.lang.RuntimeException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.7.0_75\bin\java.exe'' finished with non-zero exit value 2

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:transformClassesWithDexForDebug'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203) …

非常简单:我在屏幕上添加一个动态按钮,我尝试在添加后将其淡出,但动画永远不会播放.我稍后在屏幕上渲染时尝试添加它,但仍然没有.以下是代码:

btn = new ImageButton(context);
btn.setBackgroundColor(0xFFFF0000);

params = new WindowManager.LayoutParams(
    width,height,
    WindowManager.LayoutParams.TYPE_SYSTEM_ALERT | 
    WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
    WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH |
    WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
    PixelFormat.TRANSLUCENT);
params.gravity = Gravity.TOP | Gravity.LEFT;

windowManager.addView(btn, params);

btn.startAnimation(new AlphaAnimation(1,0));

有任何想法吗？