實例詳解用戶輸入 i. 檢測常用手勢

效果：一個手指實現（所有手勢事件）和（部分事件的）；

A. 所有手勢

activity_main.xml

<TextView 
android:id="@+id/gesture" 
android:layout_width="match_parent" 
android:layout_height="150dp" 
android:gravity="center" 
android:text="單擊手勢變化" /><TextView 
android:id="@+id/doubleTap" 
android:layout_width="match_parent" 
android:layout_height="150dp" 
android:gravity="center" 
android:text="雙擊手勢變化" /> 

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); 
// 構造GestureDetector對象，傳入監聽器對象 
mGestureDetector = new GestureDetector(this, mOnGestureListener); 
// 傳入雙擊監聽器對象 
mGestureDetector.setOnDoubleTapListener(mDoubleTapListener); 
} 
@Override public boolean onTouchEvent(MotionEvent event) 
{ 
// 在onTouchEvent方法中將事件傳遞給手勢檢測對象，否則手勢監聽對象中的回調函數是不會被調用的 
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. 部分手勢

如果你僅僅只想處理幾種手勢，你可以選擇繼承GestureDetector.SimpleOnGestureListener類，而不是實現
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); 
// 構造GestureDetector對象，傳入監聽器對象 
mGestureDetector = new GestureDetector(this, new MyGestureListener()); 
// 傳入雙擊監聽器對象 
} 
@Override 
public boolean onTouchEvent(MotionEvent event) 
{ 
// 在onTouchEvent方法中將事件傳遞給手勢檢測對象，否則手勢監聽對象中的回調函數是不會被調用的 
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; 
} 
}}