用戶輸入 i. 檢測常用手勢（一）

參考：

http://blog.csdn.net/qq418716640/article/details/8508973
http://www.cnblogs.com/mengdd/p/3335508.html

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介面

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;

        }
    }

}