Android 左右滑動切換頁面或Activity的效果實現

對於Android案頭可以用手勢左右滑動進行切換。或者大家用過iReader的一定被其豐富的手勢折服吧。現在看看自己的多個Activy之間如何切換呢

 

1、需要繼承OnGestureListener和OnDoubleTapListener，如下：

Java代碼  

1. public
    
   class
    ViewSnsActivity 
   extends
    Activity 
   implements
    OnTouchListener, OnGestureListener  
   

public class ViewSnsActivity extends Activity implements OnTouchListener, OnGestureListener

 

2、在添加mGestureDetector的定義，並在
ViewSnsActivity的onCreate函數中加入其頁面配置的setOnTouchListener事件

 

Java代碼  

1. GestureDetector mGestureDetector;  
   

GestureDetector mGestureDetector;

 

 

Java代碼  

1. public
    
   void
    onCreate(Bundle savedInstanceState) {  
   
2.         super
   .onCreate(savedInstanceState);  
   
3.         setContentView(R.layout.view_sns_activity);  
4.           
5.         mGestureDetector = new
    GestureDetector((OnGestureListener) 
   this
   );    
   
6.         LinearLayout viewSnsLayout = (LinearLayout)findViewById(R.id.viewSnsLayout);    
7.         viewSnsLayout.setOnTouchListener(this
   );    
   
8.         viewSnsLayout.setLongClickable(true
   );    
   
9.     }  

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、重載onFling函數

Java代碼  

1.     
   public
    
   boolean
    onFling(MotionEvent e1, MotionEvent e2, 
   float
    velocityX,  
   
2.             float
    velocityY) {  
   
3.           
4.         if
    (e1.getX()-e2.getX() > snsConstant.getFlingMinDistance()  
   
5.                 && Math.abs(velocityX) > snsConstant.getFlingMinVelocity()) {  
6.   
7. //          切換Activity
     
   
8. //          Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);
     
   
9. //          startActivity(intent);
     
   
10.             Toast.makeText(this
    , 
    "向左手勢"
    , Toast.LENGTH_SHORT).show();  
    
11.         } else
     
    if
     (e2.getX()-e1.getX() > snsConstant.getFlingMinDistance()  
    
12.                 && Math.abs(velocityX) > snsConstant.getFlingMinVelocity()) {  
13.               
14. //          切換Activity
      
    
15. //          Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);
      
    
16. //          startActivity(intent);
      
    
17.             Toast.makeText(this
    , 
    "向右手勢"
    , Toast.LENGTH_SHORT).show();  
    
18.         }  
19.           
20.         return
     
    false
    ;    
    
21.     }  

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {if (e1.getX()-e2.getX() > snsConstant.getFlingMinDistance()&& Math.abs(velocityX) > snsConstant.getFlingMinVelocity()) {// 切換Activity//Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);//startActivity(intent);Toast.makeText(this, "向左手勢", Toast.LENGTH_SHORT).show();} else if (e2.getX()-e1.getX() > snsConstant.getFlingMinDistance()&& Math.abs(velocityX) > snsConstant.getFlingMinVelocity()) {//切換Activity//Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);//startActivity(intent);Toast.makeText(this, "向右手勢", Toast.LENGTH_SHORT).show();}return false;  }

其中SnsConstant如下：

Java代碼  

1. public
    
   class
    SnsConstant {  
   
2.     private
    
   static
    
   final
    
   int
    FLING_MIN_DISTANCE = 
   50
   ;    
   
3.     private
    
   static
    
   final
    
   int
    FLING_MIN_VELOCITY = 
   0
   ;  
   
4.       
5.     public
    
   static
    
   int
    getFlingMinDistance() {  
   
6.         return
    FLING_MIN_DISTANCE;  
   
7.     }  
8.     public
    
   static
    
   int
    getFlingMinVelocity() {  
   
9.         return
    FLING_MIN_VELOCITY;  
   
10.     }  
11. }  

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、重載onTouch函數

 

Java代碼  

1. public
    
   boolean
    onTouch(View v, MotionEvent event) {  
   
2.     return
    mGestureDetector.onTouchEvent(event);  
   
3. }  

public boolean onTouch(View v, MotionEvent event) {return mGestureDetector.onTouchEvent(event);}