android

GestureDetector学习之左右滑动，上下滑动屏幕切换页面

要实现滑屏等触发事件，视情况而定；

如果实现的触屏或者手势效果较多，则使用第一种方法，实现OnGestureListener 接口（参考OnGestureListener）；

如果只是实现较少的效果，则考虑使用SimpleOnGestureListener（参考SimpleOnGestureListenter）;

主要分为以下三步：

第一种方法：

1、继承OnTouchListener , OnGestureListener ；

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//继承OnTouchListener,OnGestureListener  
public class MainActivity extends Activity implements OnTouchListener,OnGestureListener{

注：此处使用的OnGestureListener来自包 android.view.GestureDetector.OnGestureListener;而不是 android.gesture.GestureOverlayView.OnGestureListener;

2、初始化OnGestureListener ，即注册手势监听 ；获得当前接受操作的布局id ； 注册触屏监听；

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//手势监听  
mGestureDetector = new GestureDetector(MainActivity.this,(OnGestureListener) this);//(OnGestureListener) 可以省略  
//获得当前接受操作的布局id  
RelativeLayout mActivity = (RelativeLayout)findViewById(R.id.main_activity);  
//触屏监听  
mActivity.setOnTouchListener(this);  
mActivity.setLongClickable(true);

3、重载onFling()和onTouch();

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public boolean onTouch(View v, MotionEvent event) {  
    return mGestureDetector.onTouchEvent(event);  
}  
      
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {  
        //省略  
}

第二种方法如下：

1、继承OnTouchListener ；

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//继承OnTouchListener  
public class MainActivity extends Activity implements OnTouchListener{

2、初始化OnGestureListener ，即注册手势监听 ；获得当前接受操作的布局id ； 注册触屏监听；

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//手势监听  
mGestureDetector = new GestureDetector(MainActivity.this,new MySimpleOnGestureListener());//下边定义MySimpleOnGestureListener,  
                                                                                          //并使其继承SimpleOnGestureListener类  
//获得当前接受操作的布局id  
RelativeLayout mActivity = (RelativeLayout)findViewById(R.id.main_activity);  
//触屏监听  
mActivity.setOnTouchListener(this);  
mActivity.setLongClickable(true);

3、定义SimpleOnGestureListener子类，并重载onTouch()和所需方法;

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class MySimpleGestureListener extends SimpleOnGestureListener{  
        @Override   
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {  
              
            //大于设定的最小滑动距离并且在水平/竖直方向速度绝对值大于设定的最小速度，则执行相应方法  
            if(e1.getX()-e2.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){  
                Toast.makeText(MainActivity.this, "turn left", Toast.LENGTH_SHORT).show();  
                      
            }else if(e2.getX() - e1.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){  
                Toast.makeText(MainActivity.this, "turn right", Toast.LENGTH_SHORT).show();  
                  
            }else if(e1.getY()-e2.getY() > 20 && Math.abs(velocityY) > 10){  
                Toast.makeText(MainActivity.this, "turn up", Toast.LENGTH_SHORT).show();  
                  
            }else if(e2.getY()-e1.getY() > 20 && Math.abs(velocityY) > 10){  
                Toast.makeText(MainActivity.this, "turn down", Toast.LENGTH_SHORT).show();  
            }  
              
            return false;  
        }  
          
         @Override  
         public boolean onDown(MotionEvent e){  
        Toast.makeText(MainActivity.this, "onDown", Toast.LENGTH_SHORT).show();  
        return false;  
         }  
    }

具体代码如下：

（第一种方法）

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import android.app.Activity;  
import android.content.Intent;  
  
import android.os.Bundle;  
import android.util.Log;  
import android.view.GestureDetector;  
import android.view.GestureDetector.OnGestureListener;  
import android.view.GestureDetector.SimpleOnGestureListener;  
import android.view.Menu;  
import android.view.MotionEvent;  
import android.view.View;  
import android.view.View.OnTouchListener;  
import android.widget.*;  
  
public class MainActivity extends Activity implements OnTouchListener,OnGestureListener{  
        private static final String tag = "mainActivity";  
      
    private GestureDetector mGestureDetector;  
    private int verticalMinistance = 20;            //水平最小识别距离  
    private int minVelocity = 10;           //最小识别速度  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
        //手势监听  
        mGestureDetector = new GestureDetector(MainActivity.this,(OnGestureListener) this);//(OnGestureListener) 可以省略  
        //获得当前接受操作的布局id  
        RelativeLayout mActivity = (RelativeLayout)findViewById(R.id.main_activity);  
        //触屏监听  
        mActivity.setOnTouchListener(this);  
        mActivity.setLongClickable(true);  
          
    }  
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
  
    @Override  
    public boolean onTouch(View v, MotionEvent event) {  
        return mGestureDetector.onTouchEvent(event);  
    }  
      
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {  
          
         //大于设定的最小滑动距离并且在水平/竖直方向速度绝对值大于设定的最小速度，则执行相应方法  
        if(e1.getX()-e2.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){  
                //在此处实现跳转  
                //Intent intent  = new Intent(MainActivity.this,nextActivity.class);  
            //startActivity(intent);  
                 
            Toast.makeText(MainActivity.this, "turn left", Toast.LENGTH_SHORT).show();  
                  
        }else if(e2.getX() - e1.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){  
            Toast.makeText(MainActivity.this, "turn right", Toast.LENGTH_SHORT).show();  
              
        }else if(e1.getY()-e2.getY() > 20 && Math.abs(velocityY) > 10){  
            Toast.makeText(MainActivity.this, "turn up", Toast.LENGTH_SHORT).show();  
              
        }else if(e2.getY()-e1.getY() > 20 && Math.abs(velocityY) > 10){  
            Toast.makeText(MainActivity.this, "turn down", Toast.LENGTH_SHORT).show();  
        }  
              
        return false;  
    }  
  
    //只要有触发就会调用次方法  
    @Override  
    public boolean onDown(MotionEvent e) {  
        Toast.makeText(MainActivity.this, "onDown", Toast.LENGTH_SHORT).show();  
        return false;  
    }  
  
    @Override  
    public void onLongPress(MotionEvent e) {  
        Toast.makeText(MainActivity.this, "onLongPress", Toast.LENGTH_SHORT).show();  
          
    }  
  
    @Override  
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {  
          
//      Toast.makeText(MainActivity.this, "onScroll", Toast.LENGTH_SHORT).show();  
        return false;  
    }  
  
  
    @Override  
    public void onShowPress(MotionEvent e) {  
//      Toast.makeText(MainActivity.this, "onShowPress", Toast.LENGTH_SHORT).show();  
    }  
  
    @Override  
    public boolean onSingleTapUp(MotionEvent e) {  
//      Toast.makeText(MainActivity.this, "onsingleTapup", Toast.LENGTH_SHORT).show();  
        return false;  
    }       
}

（第二种方法）

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import android.app.Activity;  
import android.content.Intent;  
  
import android.os.Bundle;  
import android.util.Log;  
import android.view.GestureDetector;  
import android.view.GestureDetector.OnGestureListener;  
import android.view.GestureDetector.SimpleOnGestureListener;  
import android.view.Menu;  
import android.view.MotionEvent;  
import android.view.View;  
import android.view.View.OnTouchListener;  
import android.widget.*;  
  
public class MainActivity extends Activity implements OnTouchListener{  
    private static final String tag = "mainActivity";  
      
    private GestureDetector mGestureDetector;  
    private int verticalMinistance = 20;            //水平最小识别距离  
    private int minVelocity = 10;           //最小识别速度  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
        //手势监听  
        mGestureDetector = new GestureDetector(MainActivity.this,new LearnGestureListener());  
        //获得当前接受操作的布局id  
        RelativeLayout mActivity = (RelativeLayout)findViewById(R.id.main_activity);  
        //触屏监听  
        mActivity.setOnTouchListener(this);  
        mActivity.setLongClickable(true);  
          
    }  
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
  
    @Override  
    public boolean onTouch(View v, MotionEvent event) {  
        return mGestureDetector.onTouchEvent(event);  
    }  
      
    class LearnGestureListener extends SimpleOnGestureListener{  
        @Override   
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {  
              
            //大于设定的最小滑动距离并且在水平/竖直方向速度绝对值大于设定的最小速度，则执行相应方法  
            if(e1.getX()-e2.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){  
                Toast.makeText(MainActivity.this, "turn left", Toast.LENGTH_SHORT).show();  
                      
            }else if(e2.getX() - e1.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){  
                Toast.makeText(MainActivity.this, "turn right", Toast.LENGTH_SHORT).show();  
                  
            }else if(e1.getY()-e2.getY() > 20 && Math.abs(velocityY) > 10){  
                Toast.makeText(MainActivity.this, "turn up", Toast.LENGTH_SHORT).show();  
                  
            }else if(e2.getY()-e1.getY() > 20 && Math.abs(velocityY) > 10){  
                Toast.makeText(MainActivity.this, "turn down", Toast.LENGTH_SHORT).show();  
            }  
              
            return false;  
        }  
          
        @Override  
        public boolean onDown(MotionEvent e){  
            Toast.makeText(MainActivity.this, "onDown", Toast.LENGTH_SHORT).show();  
            return false;  
        }  
    }  
   
}

转自：http://blog.csdn.net/rflyee/article/details/9383889