Add support for swapping feeds in Android AppRTCMobile.

webrtc/examples/androidapp/src/org/appspot/apprtc/PercentFrameLayout.java

-/*
- *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-package org.appspot.apprtc;
-
-import android.content.Context;
-import android.util.AttributeSet;
-import android.view.View;
-import android.view.ViewGroup;
-
-/**
- * Simple container that confines the children to a subrectangle specified as percentage values of
- * the container size. The children are centered horizontally and vertically inside the confined
- * space.
- */
-public class PercentFrameLayout extends ViewGroup {
-  private int xPercent = 0;
-  private int yPercent = 0;
-  private int widthPercent = 100;
-  private int heightPercent = 100;
-
-  public PercentFrameLayout(Context context) {
-    super(context);
-  }
-
-  public PercentFrameLayout(Context context, AttributeSet attrs) {
-    super(context, attrs);
-  }
-
-  public PercentFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
-    super(context, attrs, defStyleAttr);
-  }
-
-  public void setPosition(int xPercent, int yPercent, int widthPercent, int heightPercent) {
-    this.xPercent = xPercent;
-    this.yPercent = yPercent;
-    this.widthPercent = widthPercent;
-    this.heightPercent = heightPercent;
-  }
-
-  @Override
-  public boolean shouldDelayChildPressedState() {
-    return false;
-  }
-
-  @Override
-  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-    final int width = getDefaultSize(Integer.MAX_VALUE, widthMeasureSpec);
-    final int height = getDefaultSize(Integer.MAX_VALUE, heightMeasureSpec);
-    setMeasuredDimension(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
-        MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
-
-    final int childWidthMeasureSpec =
-        MeasureSpec.makeMeasureSpec(width * widthPercent / 100, MeasureSpec.AT_MOST);
-    final int childHeightMeasureSpec =
-        MeasureSpec.makeMeasureSpec(height * heightPercent / 100, MeasureSpec.AT_MOST);
-    for (int i = 0; i < getChildCount(); ++i) {
-      final View child = getChildAt(i);
-      if (child.getVisibility() != GONE) {
-        child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
-      }
-    }
-  }
-
-  @Override
-  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
-    final int width = right - left;
-    final int height = bottom - top;
-    // Sub-rectangle specified by percentage values.
-    final int subWidth = width * widthPercent / 100;
-    final int subHeight = height * heightPercent / 100;
-    final int subLeft = left + width * xPercent / 100;
-    final int subTop = top + height * yPercent / 100;
-
-    for (int i = 0; i < getChildCount(); ++i) {
-      final View child = getChildAt(i);
-      if (child.getVisibility() != GONE) {
-        final int childWidth = child.getMeasuredWidth();
-        final int childHeight = child.getMeasuredHeight();
-        // Center child both vertically and horizontally.
-        final int childLeft = subLeft + (subWidth - childWidth) / 2;
-        final int childTop = subTop + (subHeight - childHeight) / 2;
-        child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
-      }
-    }
-  }
-}