利用OnGestureListener识别用户手势
文件引用：http://samwong.iteye.com/blog/870779
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android可以识别用户的手势（即用户用手指滑动的方向），通过用户不同的手势，从而做出不同的处理，下面是一个识别用户手势的效果：
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实现过程是，继承OnGestureListener方法，通过坐标来实现。下面是主要代码：
public class GestureTest extends Activity implements OnTouchListener,
??????? OnGestureListener {??? GestureDetector mGestureDetector;
??? private static final int FLING_MIN_DISTANCE = 100;
??? private static final int FLING_MIN_VELOCITY = 200;??? @Override
??? protected void onCreate(Bundle savedInstanceState) {
??????? super.onCreate(savedInstanceState);
??????? setContentView(R.layout.main);??????? mGestureDetector = new GestureDetector(this);
??????? TextView tv = (TextView) findViewById(R.id.page);
??????? tv.setOnTouchListener(this);
??????? tv.setText(R.string.text);
??????? tv.setLongClickable(true);
??? }??? @Override
??? public boolean onTouch(View v, MotionEvent event) {
??????? return mGestureDetector.onTouchEvent(event);
??? }
??? @Override
??? public boolean onDown(MotionEvent e) {
??????? return false;
??? }
??? @Override
??? public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
??????????? float velocityY) {
??????? if (e1.getX() – e2.getX() > FLING_MIN_DISTANCE
??????????????? && Math.abs(velocityX) > FLING_MIN_VELOCITY) {
??????????? // Fling left
??????????? Toast.makeText(this, "向左手势", Toast.LENGTH_SHORT).show();
??????? } else if (e2.getX() – e1.getX() > FLING_MIN_DISTANCE
??????????????? && Math.abs(velocityX) > FLING_MIN_VELOCITY) {
??????????? // Fling right
??????????? Toast.makeText(this, "向右手势", Toast.LENGTH_SHORT).show();
??????? }
??????? return false;
??? }
??? @Override
??? public void onLongPress(MotionEvent e) {??? }
??? @Override
??? public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
??????????? float distanceY) {
??????? return false;
??? }??? @Override
??? public void onShowPress(MotionEvent e) {??? }
??? @Override
??? public boolean onSingleTapUp(MotionEvent e) {
??????? return false;
??? }}
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源代码：http://easymorse-android.googlecode.com/svn/trunk/GestureTest
