小問題記錄

1. 當一個ViewGroup中有兩個 SurfaceVeiw 時，如surfaceView1, surfaceView2, 要 使sufaceView1 所有顯示在下面,  而 surfaceView2 以透明的方式 覆蓋在surfaceView1 之上， 以下設置，

surfaceView1.setZOrderOnTop(false);  

surfaceView2.setZOrderMediaOverlay(true);

surfaceView2.getHolder().setFormat(PixelFormat.TRANSPARENT);

 

 2.實現Parcelable接口時，成員變量boolean類型的實現：

public boolean isSelected;

public void writeToParcel(Parcel out, int flags) {       
　　 out.writeByte((byte) (isSelected ? 1 : 0));
}
private LyrPointEntity(Parcel in) {
    isSelected = in.readByte() != 0;
}

 

3.當在Fragment裏面添加Viewpager，Viewpager由多個Fragment組成，在viewpager的setAdapter時產生錯誤以下：Recursive entry to executePendingTransactions。

 

public class FrgtPagerAdapter extends FragmentPagerAdapter {
    private ArrayList<Fragment> fragments;

    public FrgtPagerAdapter(Fragment fragment, ArrayList<Fragment> fragments) {
        super(fragment.getChildFragmentManager());
        this.fragments = fragments;
    }

於我而言，以前在構造方法裏，super()參數是activity.getSupportFragmentManager()，如上，將其改成
getChildFragmentManager()便可。

http://stackoverflow.com/questions/7338823/viewpager-recursive-entry-to-executependingtransactions

 

4. 下列方法分兩個階段關閉 ExecutorService。第一階段調用 shutdown 拒絕傳入任務，而後等60秒後，任務還沒執行完成，就調用 shutdownNow（若有必要）取消全部遺留的任務：

 

 void shutdownAndAwaitTermination(ExecutorService pool) {
   pool.shutdown(); // Disable new tasks from being submitted
   try {
     // Wait a while for existing tasks to terminate
     if (!pool.awaitTermination(60, TimeUnit.SECONDS)) {
       pool.shutdownNow(); // Cancel currently executing tasks
       // Wait a while for tasks to respond to being cancelled
       if (!pool.awaitTermination(60, TimeUnit.SECONDS))
           System.err.println("Pool did not terminate");
     }
   } catch (InterruptedException ie) {
     // (Re-)Cancel if current thread also interrupted
     pool.shutdownNow();
     // Preserve interrupt status
     Thread.currentThread().interrupt();
   }
 }