Android Open Source - PinchToClose Pinch To Close

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License

The source code is released under:

Apache License

Java Source Code

package lt.marius.pinchtoclose;
/*ww w .  ja v a2  s .c o  m*/
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.ViewGroup;
/**
 * Wrapper static class for initializing PinchToClose
 * @author Marius Noreikis
 * Created: Mar 28, 2014
 */
public class PinchToClose {

  public interface CustomFinishCallback {
    public void finish(Activity activity);
  }
  
  /**
   * Initialize PinchToClose for the specified activity. The activity
   * will be closed by pinching at least 3 fingers on the screen
   * @param activity Activity which should be closed by pinch
   */
  public static void init(Activity activity) {
    init(activity, false, null, false);
  }
  
  /**
   * Initialize PinchToClose for the specified activity. The activity
   * will be closed by pinching at least 3 fingers on the screen
   * @param activity Activity which should be closed by pinch
   * @param closeAll whether to close parent activities
   * @param callback function to be called for closing the activity. 
   * Convenient if you want to set the activity result etc. before 
   * closing the activity
   */
  public static void init(Activity activity, boolean closeAll, CustomFinishCallback callback) {
    init(activity, closeAll, callback, false);
  }
  
  /**
   * Initialize PinchToClose for the specified activity. The activity
   * will be closed by pinching at least 3 fingers on the screen
   * @param activity Activity which should be closed by pinch
   * @param closeAll whether to close parent activities
   * @param callback function to be called for closing the activity. 
   * @param debug whether or not draw debugging information on screen
   * Convenient if you want to set the activity result etc. before 
   * closing the activity
   */
  public static void init(Activity activity, boolean closeAll, CustomFinishCallback callback, boolean debug) {
    ViewGroup root = (ViewGroup)activity.findViewById(android.R.id.content);
    root = findRecursiveRoot(root);
    if (root == null) {
      throw new IllegalArgumentException("Root layout not yet initialized." +
          "This must be called after setContentView()");
    }
    CloseDecoratorLayout layout = new CloseDecoratorLayout(activity);
    layout.setBackgroundColor(Color.BLACK);
    layout.setDebugMode(debug);
    layout.setId(CLOSE_DECORATOR_ID);
    ViewGroup existing = (ViewGroup)root.findViewById(CLOSE_DECORATOR_ID);
    if (existing != null) {
      removeView(root, existing);  //prevent reinitialisation problems
    }
    insertView(root, layout);
    layout.setCloseAll(closeAll);
    layout.setCustomFinishCallback(callback);
  }
  
  private static final int CLOSE_DECORATOR_ID = 0x7f06ffff;
  
  private static void insertView(ViewGroup parent, ViewGroup added) {
    List<View> children = new ArrayList<View>();
    for (int i = 0, n = parent.getChildCount(); i < n; i++) {
      children.add(parent.getChildAt(i));
    }
    parent.removeAllViews();
    
    for (View v : children) {
      added.addView(v);
    }
    
    parent.addView(added);
  }
  
  private static void removeView(ViewGroup parent, ViewGroup remove) {
    List<View> children = new ArrayList<View>();
    for (int i = 0, n = remove.getChildCount(); i < n; i++) {
      children.add(remove.getChildAt(i));
    }
    remove.removeAllViews();
    
    parent.removeView(remove);
    for (View v : children) {
      parent.addView(v);
    }
    
  }  
  
  private static ViewGroup findRecursiveRoot(ViewGroup view) {
    if (view.getParent() != null && view.getParent() instanceof ViewGroup) {
      return findRecursiveRoot((ViewGroup) view.getParent());
    }
    return view;
  }
  
  
}

Java Source Code List

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