GestureDetector学习之左右滑动，上下滑动屏幕切换页面

2022-12-08 14:27:34

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 ；

//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；

//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();

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 ；

//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；

//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;

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）

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）

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;

		}

	}

}

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