实例详解用户输入 i. 检测常用手势

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

android:id="@+id/gesture"

android:layout_width="match_parent"

android:layout_height="150dp"

android:gravity="center"

android:text="单击手势变化" />

android:id="@+id/doubleTap"

android:layout_width="match_parent"

android:layout_height="150dp"

android:gravity="center"

android:text="双击手势变化" />

MainActivity.java

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;

}

};}

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

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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