Android开发——实现TabHost随手滑动切换选项卡功能（绝对实用）
以前用TabHost只是点击导航栏选项卡才进行切换，今天试了下手势滑动进行切换，搜了好多资料感觉特别乱，花了好长时间整理了一下终于有效果了，自己写了一个Demo。
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程序清单1：布局文件
说明：和我们写Tabhost布局文件一样
activity_main.xml
android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent"> android:layout_width="fill_parent" android:layout_height="fill_parent"> android:layout_width="fill_parent" android:layout_height="wrap_content" /> android:layout_width="fill_parent" android:layout_height="fill_parent" > android:focusable="true" android:focusableInTouchMode="true" android:id="@+id/tab01" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="你好" android:textSize="20sp"/> android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="match_parent" android:dividerHeight="10dp" android:divider="#D1D1D1" > android:id="@+id/tab02" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="你好" android:textSize="20sp"/> android:id="@+id/listview1" android:layout_width="match_parent" android:layout_height="match_parent">
android:id="@+id/tab03" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="你好" android:textSize="20sp"/> android:id="@+id/listview2" android:layout_width="match_parent" android:layout_height="360dp" > 程序清单2： MainActivity.java public class MainActivity extends TabActivity { 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; private Animation slideLeftIn; private Animation slideLeftOut; private Animation slideRightIn; private Animation slideRightOut; private ViewFlipper viewFlipper; int currentView = 0; private static int maxTabIndex = 2; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TabHost tabHost = getTabHost(); tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("tab1 ") .setContent(R.id.tab01)); tabHost.addTab(tabHost.newTabSpec("tab2").setIndicator("tab2 ") .setContent(R.id.tab02)); tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab3 ") .setContent(R.id.tab03)); tabHost.setCurrentTab(0); slideLeftIn = AnimationUtils.loadAnimation(this, R.anim.slide_left_in); slideLeftOut = AnimationUtils .loadAnimation(this, R.anim.slide_left_out); slideRightIn = AnimationUtils .loadAnimation(this, R.anim.slide_right_in); slideRightOut = AnimationUtils.loadAnimation(this, R.anim.slide_right_out); gestureDetector = new GestureDetector(new MyGestureDetector()); gestureListener = new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { if (gestureDetector.onTouchEvent(event)) { return true; } return false; } }; } class MyGestureDetector extends GestureDetector.SimpleOnGestureListener { @Override public 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; if (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) { // nothing } return false; } } //@Override //public boolean onTouchEvent(MotionEvent event) { //if (gestureDetector.onTouchEvent(event)) //return true; //else //return false; //} @Override public boolean dispatchTouchEvent(MotionEvent event) { if(gestureDetector.onTouchEvent(event)){ event.setAction(MotionEvent.ACTION_CANCEL); } return super.dispatchTouchEvent(event); } } 当然这里会用到关于滑动的四个xml文件 我们将它们存在 res\anim中 (anim文件要自己新建) 1、 slide_left_in 2、slide_lefe_out 3、slide_right_in 4、slide_right_out 1、 slide_left_in.xml android:duration="500" android:fromXDelta="100%p" android:toXDelta="0" /> android:duration="500" android:fromAlpha="0.0" android:toAlpha="1.0" /> 2、slide_lefe_out.xml android:duration="500" android:fromXDelta="0" android:toXDelta="-100%p" /> android:duration="500" android:fromAlpha="1.0" android:toAlpha="0.0" /> 3、slide_right_in.xml android:duration="500" android:fromXDelta="-100%p" android:toXDelta="0" /> android:duration="500" android:fromAlpha="0.0" android:toAlpha="1.0" /> 4、slide_right_out.xml android:duration="1500" android:fromXDelta="0" android:toXDelta="100%p" /> android:duration="1500" android:fromAlpha="1.0" android:toAlpha="0.1" /> 好了现在就完成了。来几张效果图：
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