Android 左右滑动切换页面或Activity的效果实现

对于Android桌面可以用手势左右滑动进行切换。或者大家用过iReader的一定被其丰富的手势折服吧。现在看看自己的多个Activy之间如何切换呢

1、需要继承OnGestureListener和OnDoubleTapListener，如下：

Java代码




public class ViewSnsActivity extends Activity implements OnTouchListener, OnGestureListener

2、在添加mGestureDetector的定义，并在ViewSnsActivity的onCreate函数中加入其页面布局的setOnTouchListener事件

Java代码




GestureDetector mGestureDetector;

Java代码




public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.view_sns_activity);

mGestureDetector = new GestureDetector((OnGestureListener) this);

LinearLayout viewSnsLayout = (LinearLayout)findViewById(R.id.viewSnsLayout);

viewSnsLayout.setOnTouchListener(this);

viewSnsLayout.setLongClickable(true);

}

3、重载onFling函数

Java代码




public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

float velocityY) {

if (e1.getX()-e2.getX() > snsConstant.getFlingMinDistance()

&& Math.abs(velocityX) > snsConstant.getFlingMinVelocity()) {

// 切换Activity

// Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);

// startActivity(intent);

Toast.makeText(this, "向左手势", Toast.LENGTH_SHORT).show();

} else if (e2.getX()-e1.getX() > snsConstant.getFlingMinDistance()

&& Math.abs(velocityX) > snsConstant.getFlingMinVelocity()) {

// 切换Activity

// Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);

// startActivity(intent);

Toast.makeText(this, "向右手势", Toast.LENGTH_SHORT).show();

}

return false;

}

其中SnsConstant如下：

Java代码




public class SnsConstant {

private static final int FLING_MIN_DISTANCE = 50;

private static final int FLING_MIN_VELOCITY = 0;

public static int getFlingMinDistance() {

return FLING_MIN_DISTANCE;

}

public static int getFlingMinVelocity() {

return FLING_MIN_VELOCITY;

}

}

4、重载onTouch函数

Java代码




public boolean onTouch(View v, MotionEvent event) {

return mGestureDetector.onTouchEvent(event);

}