实例详解用户输入 i. 检测常用手势

<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" /> 

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; } };} 

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; } }}