android之OnGestureListener实现图片的左右滑动

先来看看效果图吧

welcome_glide.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent">  <ViewFlipper android:id="@+id/viewflipper"    android:layout_width="fill_parent"    android:layout_height="fill_parent"/>  </LinearLayout>

import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.DisplayMetrics;import android.util.Log;import android.view.GestureDetector;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.view.WindowManager;import android.view.GestureDetector.OnGestureListener;import android.view.animation.AnimationUtils;import android.widget.ImageView;import android.widget.ViewFlipper;import static android.view.KeyEvent.KEYCODE_BACK;  public class WelcomeGlide extends Activity implements OnGestureListener{private static final String TAG = "Fuchangle.AggHelp";private int mScreenWidth ;private int mScreenHeight ;private GestureDetector detector;private ViewFlipper flipper;private int mIndexHelpPic = 0;private int[] mBgList = {R.drawable.guide01,R.drawable.guide02,R.drawable.guide03,R.drawable.guide04,R.drawable.guide05};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.welcome_glide);DisplayMetrics dm =  new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);mScreenWidth = dm.widthPixels;mScreenHeight = dm.heightPixels;if(mScreenWidth <240){mScreenWidth = 240;}if(mScreenHeight < 320){mScreenHeight = 320;}flipper = (ViewFlipper)this.findViewById(R.id.viewflipper);flipper.addView(addImageByID(mBgList[mIndexHelpPic]), new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT));detector = new GestureDetector(this);}@Overridepublic boolean onDown(MotionEvent e) {return false;}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {if(e1.getX()-e2.getX() > 120){if(++mIndexHelpPic >= mBgList.length){mIndexHelpPic = mBgList.length - 1;backToMainDesk();return true;}this.flipper.setInAnimation(AnimationUtils.loadAnimation(this,R.anim.push_left_in));this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));flipper.addView(addImageByID(mBgList[mIndexHelpPic]),new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));this.flipper.showNext();}else if(e1.getX() - e2.getX()< -120){if(--mIndexHelpPic < 0){mIndexHelpPic = 0;return true;}this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in));this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out));this.flipper.showPrevious();return true;}return true;}private void backToMainDesk(){startActivity(new Intent(this,QQActivity.class));finish();}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {         switch (keyCode) {            case KEYCODE_BACK:               backToMainDesk();               return true;           default:               break;         }         return super.onKeyDown(keyCode, event);     }  private View addImageByID(int id){ImageView img = new ImageView(this);img.setImageResource(id);img.setAdjustViewBounds(true);img.setMaxWidth(mScreenWidth);img.setMaxHeight(mScreenHeight);img.setScaleType(ImageView.ScaleType.FIT_XY);return img;}@Overridepublic boolean onTouchEvent(MotionEvent event) {Log.i("Fling",  "Activity onTouchEvent!");return this.detector.onTouchEvent(event);  }@Overridepublic void onLongPress(MotionEvent e) {}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) {return false;}@Overridepublic void onShowPress(MotionEvent e) {}@Overridepublic boolean onSingleTapUp(MotionEvent e) {return false;}}

下面的文件放在res/anim里面
push_left_in.xml

<?xml version="1.0" encoding="utf-8"?><set  xmlns:android="http://schemas.android.com/apk/res/android">>    <translate android:fromXDelta="100%p" android:toXDelta="0"    android:duration="500"/>    <alpha android:fromAlpha="1.0" android:toAlpha="1.0"    android:duration="500"/></set>

push_left_out.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">      <translate android:fromXDelta="0" android:toXDelta="-100%p"         android:duration="500" />      <alpha android:fromAlpha="1.0" android:toAlpha="1.0"          android:duration="500" />      </set>

push_right_in.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"><translate android:fromXDelta="0" android:toXDelta="100%p"android:duration="500" /><alpha android:fromAlpha="1.0" android:toAlpha="1.0"android:duration="500" /></set>

push_right_out.xml

<?xml version="1.0" encoding="utf-8"?>  <set xmlns:android="http://schemas.android.com/apk/res/android">      <translate android:fromXDelta="-100%p" android:toXDelta="0"          android:duration="500" />      <alpha android:fromAlpha="1.0" android:toAlpha="1.0"          android:duration="500" />  </set>

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