Android Open Source - android-screenshot-gallery Overlay Decor Layout

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Back to project page android-screenshot-gallery.

License

The source code is released under:

Apache License

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Java Source Code

package com.demondevelopers.screenshotgallery;
//from w ww  .  j ava 2s  . c o  m
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.Window;
import android.widget.FrameLayout;


public class OverlayDecorLayout extends FrameLayout
{
  private View mActionBar;
  
  
  public OverlayDecorLayout(Context context)
  {
    super(context);
    initView(context, null);
  }
  
  public OverlayDecorLayout(Context context, AttributeSet attrs)
  {
    super(context, attrs);
    initView(context, attrs);
  }
  
  public OverlayDecorLayout(Context context, AttributeSet attrs, int defStyle)
  {
    super(context, attrs, defStyle);
    initView(context, attrs);
  }
  
  protected void initView(Context context, AttributeSet attrs)
  {
    Activity activity = (Activity)getContext();
    if(activity.getWindow().hasFeature(Window.FEATURE_ACTION_BAR_OVERLAY)){
      mActionBar = findActivityActionBar(activity);
      if(mActionBar == null){
        throw new IllegalStateException("Failed to find ActionBar");
      }
    }
  }
  
  /**
   * Finds ActionBar the same way the platform does.
   * 
   */
  private View findActivityActionBar(Activity activity)
  {
    View actionBar = null;
    View decor = activity.getWindow().getDecorView();
    int top_action_bar = getResources().getIdentifier("android:id/top_action_bar", null, null);
    if(top_action_bar != 0){
      actionBar = decor.findViewById(top_action_bar);
    }
    if(actionBar == null){
      int action_bar_container = getResources().getIdentifier("android:id/action_bar_container", null, null);
      if(action_bar_container != 0){
        actionBar = decor.findViewById(action_bar_container);
      }
    }
    return actionBar;
  }
  
  @Override
  protected void onAttachedToWindow()
  {
    super.onAttachedToWindow();
    if(mActionBar != null){
      ViewTreeObserver vto = mActionBar.getViewTreeObserver();
      if(vto.isAlive()){
        vto.addOnGlobalLayoutListener(mGlobalLayoutListener);
      }
    }
  }
  
  private ViewTreeObserver.OnGlobalLayoutListener mGlobalLayoutListener = 
    new ViewTreeObserver.OnGlobalLayoutListener()
  {
    @Override
    public void onGlobalLayout()
    {
      FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams)getLayoutParams();
      lp.topMargin = (int)(mActionBar.getHeight() + mActionBar.getTranslationY());
      setLayoutParams(lp);
      /*post(new Runnable()
      {
        public void run()
        {
          requestLayout();
        };
      });*/
    }
  };
  
  @SuppressLint("NewApi")
  @SuppressWarnings("deprecation")
  @Override
  protected void onDetachedFromWindow()
  {
    super.onDetachedFromWindow();
    if(mActionBar != null){
      ViewTreeObserver vto = mActionBar.getViewTreeObserver();
      if(vto.isAlive()){
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN){
          vto.removeOnGlobalLayoutListener(mGlobalLayoutListener);
        }
        else{
          vto.removeGlobalOnLayoutListener(mGlobalLayoutListener);
        }
      }
    }
  }
}

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