tabhost通过手势滑动切换activity

package com.mars.mp3player;import android.app.TabActivity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.GestureDetector;import android.view.GestureDetector.SimpleOnGestureListener;import android.view.Menu;import android.view.MotionEvent;import android.view.View;import android.widget.TabHost;import android.widget.TabHost.TabSpec;public class ActivityMain extends TabActivity {private TabSpec tabSpec;private TabHost tabHost;private Intent intent;private static final int SWIPE_MIN_DISTANCE = 120;private static final int SWIPE_MAX_OFF_PATH = 250;private static final int SWIPE_THRESHOLD_VELOCITY = 200;private GestureDetector gestureDetector;View.OnTouchListener gestureListener;int currentView = 0;private static int maxTabIndex = 2;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.activity_main);UtilVar.activities.add(ActivityMain.this);this.initTableHost();gestureDetector = new GestureDetector(new MyGestureDetector());gestureListener = new View.OnTouchListener() {public boolean onTouch(View v, MotionEvent event) {if (gestureDetector.onTouchEvent(event)) {return true;}return false;}};}/** * tablehost的初始化，代码完成 */private void initTableHost() {tabHost = super.getTabHost();// 歌曲列表intent = new Intent(ActivityMain.this, ActivityList.class);tabSpec = tabHost.newTabSpec("歌曲列表").setIndicator("歌曲列表",getResources().getDrawable(R.drawable.ic_launcher)).setContent(intent);tabHost.addTab(tabSpec);// 正在播放intent = new Intent(ActivityMain.this, ActivityPlaying.class);tabSpec = tabHost.newTabSpec("正在播放").setIndicator("正在播放",getResources().getDrawable(R.drawable.ic_launcher)).setContent(intent);tabHost.addTab(tabSpec);// 专辑列表intent = new Intent(ActivityMain.this, ActivityLyric.class);tabSpec = tabHost.newTabSpec("歌词显示").setIndicator("歌词显示",getResources().getDrawable(R.drawable.ic_launcher)).setContent(intent);tabHost.addTab(tabSpec);// 设置当前tabtabHost.setCurrentTab(1);}// 左右滑动刚好页面也有滑动效果class MyGestureDetector extends SimpleOnGestureListener {@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {TabHost tabHost = getTabHost();try {if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)return false;// right to left swipeif (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {Log.i("test", "right");if (currentView == maxTabIndex) {currentView = 0;} else {currentView++;}tabHost.setCurrentTab(currentView);} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {Log.i("test", "left");if (currentView == 0) {currentView = maxTabIndex;} else {currentView--;}tabHost.setCurrentTab(currentView);}} catch (Exception e) {}return false;}}@Overridepublic boolean dispatchTouchEvent(MotionEvent event) {if (gestureDetector.onTouchEvent(event)) {event.setAction(MotionEvent.ACTION_CANCEL);}return super.dispatchTouchEvent(event);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main, menu);return true;}}// 主要代码就这样吧，以后就不必到处找手势跳转activity的例子了。