CameraPreviewFrameView.java
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package com.cnlive.demo.streamqn.ui;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
/**
* Created by jerikc on 16/2/5.
*/
public class CameraPreviewFrameView extends GLSurfaceView {
private static final String TAG = "CameraPreviewFrameView";
public interface Listener {
boolean onSingleTapUp(MotionEvent e);
boolean onZoomValueChanged(float factor);
}
private Listener mListener;
private ScaleGestureDetector mScaleDetector;
private GestureDetector mGestureDetector;
public CameraPreviewFrameView(Context context) {
super(context);
initialize(context);
}
public CameraPreviewFrameView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize(context);
}
public void setListener(Listener listener) {
mListener = listener;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!mGestureDetector.onTouchEvent(event)) {
return mScaleDetector.onTouchEvent(event);
}
return false;
}
private GestureDetector.SimpleOnGestureListener mGestureListener = new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
if (mListener != null) {
mListener.onSingleTapUp(e);
}
return false;
}
};
private ScaleGestureDetector.SimpleOnScaleGestureListener mScaleListener = new ScaleGestureDetector.SimpleOnScaleGestureListener() {
private float mScaleFactor = 1.0f;
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
// factor > 1, zoom
// factor < 1, pinch
mScaleFactor *= detector.getScaleFactor();
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.01f, Math.min(mScaleFactor, 1.0f));
return mListener != null && mListener.onZoomValueChanged(mScaleFactor);
}
};
private void initialize(Context context) {
Log.i(TAG, "initialize");
mScaleDetector = new ScaleGestureDetector(context, mScaleListener);
mGestureDetector = new GestureDetector(context, mGestureListener);
}
}