效果:一个手指实现(所有手势事件)和(部分事件的);
A. 所有手势
activity_main.xml
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<TextView
android:id= "@+id/gesture"
android:layout_width= "match_parent"
android:layout_height= "150dp"
android:gravity= "center"
android:text= "单击手势变化" /><TextView
android:id= "@+id/doubleTap"
android:layout_width= "match_parent"
android:layout_height= "150dp"
android:gravity= "center"
android:text= "双击手势变化" />
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MainActivity.java
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public class MainActivity extends Activity
{
private static final String LOG_TAG = "HelloGesture" ;
private GestureDetector mGestureDetector = null ;
private TextView mGestureTextView = null ;
private TextView mDoubleTapTextView = null ;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGestureTextView = (TextView) findViewById(R.id.gesture);
mDoubleTapTextView = (TextView) findViewById(R.id.doubleTap);
// 构造GestureDetector对象,传入监听器对象
mGestureDetector = new GestureDetector( this , mOnGestureListener);
// 传入双击监听器对象
mGestureDetector.setOnDoubleTapListener(mDoubleTapListener);
}
@Override public boolean onTouchEvent(MotionEvent event)
{
// 在onTouchEvent方法中将事件传递给手势检测对象,否则手势监听对象中的回调函数是不会被调用的
mGestureDetector.onTouchEvent(event);
return super .onTouchEvent(event);
}
private OnGestureListener mOnGestureListener = new OnGestureListener()
{
@Override
public boolean onSingleTapUp(MotionEvent e)
{
Log.i(LOG_TAG, "onSingleTapUp: " + e.toString());
mGestureTextView.setText( "onSingleTapUp: " );
return false ;
}
@Override
public void onShowPress(MotionEvent e)
{
Log.i(LOG_TAG, "onShowPress: " + e.toString());
mGestureTextView.setText( "onShowPress: " );
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY)
{
Log.i(LOG_TAG, "onScroll: " + e1.toString() + ", " + e2.toString());
mGestureTextView.setText( "onScroll " );
return false ;
} @Override
public void onLongPress(MotionEvent e)
{
Log.i(LOG_TAG, "onLongPress: " + e.toString());
mGestureTextView.setText( "onLongPress: " );
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY)
{
Log.i(LOG_TAG, "onFling: " + e1.toString() + ", " + e2.toString());
mGestureTextView.setText( "onFling " );
return false ;
}
@Override
public boolean onDown(MotionEvent e)
{
Log.i(LOG_TAG, "onDown: " + e.toString());
mGestureTextView.setText( "onDown: " );
return false ;
}
}; private OnDoubleTapListener mDoubleTapListener = new OnDoubleTapListener()
{
@Override
public boolean onSingleTapConfirmed(MotionEvent e)
{
Log.i( "LOG_TAG" , "onSingleTapConfirmed: " + e.toString());
mDoubleTapTextView.setText( "onSingleTapConfirmed: " );
return false ;
}
@Override
public boolean onDoubleTapEvent(MotionEvent e)
{
Log.i( "LOG_TAG" , "onDoubleTapEvent: " + e.toString());
mDoubleTapTextView.setText( "onDoubleTapEvent: " );
return false ;
}
@Override
public boolean onDoubleTap(MotionEvent e)
{
Log.i( "LOG_TAG" , "onDoubleTap: " + e.toString());
mDoubleTapTextView.setText( "onDoubleTap: " );
return false ;
}
};}
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B. 部分手势
如果你仅仅只想处理几种手势,你可以选择继承GestureDetector.SimpleOnGestureListener类,而不是实现
GestureDetector.OnGestureListener接口
MainActivity.java
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public class MainActivity extends Activity
{
private GestureDetector mGestureDetector = null ;
private TextView mGestureTextView = null ;
private TextView mDoubleTapTextView = null ;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGestureTextView = (TextView) findViewById(R.id.gesture);
mDoubleTapTextView = (TextView) findViewById(R.id.doubleTap);
// 构造GestureDetector对象,传入监听器对象
mGestureDetector = new GestureDetector( this , new MyGestureListener());
// 传入双击监听器对象
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
// 在onTouchEvent方法中将事件传递给手势检测对象,否则手势监听对象中的回调函数是不会被调用的
this .mGestureDetector.onTouchEvent(event);
return super .onTouchEvent(event);
}
class MyGestureListener extends GestureDetector.SimpleOnGestureListener
{
private static final String DEBUG_TAG = "Gestures" ;
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY)
{
Log.d(DEBUG_TAG, "onFling: " + e1.toString() + ", " + e2.toString());
mGestureTextView.setText( "onFling " );
return false ;
}
@Override
public boolean onDown(MotionEvent e)
{
Log.d(DEBUG_TAG, "onDown: " + e.toString());
mGestureTextView.setText( "onDown: " );
return false ;
}
}}
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