触控两点，onTouchEvent

最新推荐文章于 2017-04-14 14:52:49 发布

原创最新推荐文章于 2017-04-14 14:52:49 发布 · 488 阅读

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文章标签：

#触控两点 #onTouchEvent #MotionEvent

本文介绍两种实现屏幕对角点击弹出对话框的方法：一是通过重写onTouchEvent方法捕捉多点触摸事件；二是分别在屏幕两个对角放置View并监听点击事件。

项目中遇到一个需求，需要同时点击屏幕的一个对角弹出一个对话框，查阅相关资料，找到一个常用的方法，即重写onTouchEvent，在方法中做相关处理，自己写了个demo，代码如下package com.example.twotouch;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.widget.Toast;

public class MainActivity extends Activity {
   private int x0;
   private int y0;
   private int x1;
   private int y1;
   private int width;
   private int height;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       //获取屏幕宽高
       WindowManager systemService = (WindowManager)getSystemService(WINDOW_SERVICE);
       width = systemService.getDefaultDisplay().getWidth();
       height = systemService.getDefaultDisplay().getHeight();
   }
   @Override

public boolean onTouchEvent(MotionEvent event) {

//获取点击点的个数

       int pointerCount = event.getPointerCount();
       int action = event.getAction();
       if (pointerCount==1) {
           switch (action) {
           case MotionEvent.ACTION_DOWN:
               x0 = (int)event.getX(0);
               y0=(int)event.getY(0);

               System.out.println("ACTION_DOWN pointerCount="+pointerCount);
               break;
           case MotionEvent.ACTION_MOVE:
               System.out.println("ACTION_MOVE pointerCount="+pointerCount);
               break;
           case MotionEvent.ACTION_UP:
               System.out.println("ACTION_UP pointerCount="+pointerCount);
               break;

           default:
               break;
           }
       }

       if (pointerCount==2) {
           x0 = (int)event.getX(0);
           y0=(int)event.getY(0);
           x1 = (int)event.getX(1);
           y1 = (int)event.getY(1);
           switch (action) {
           case MotionEvent.ACTION_DOWN:
               System.out.println("ACTION_DOWN pointerCount="+pointerCount);
               break;
           case MotionEvent.ACTION_MOVE:
               System.out.println("ACTION_MOVE pointerCount="+pointerCount);
               break;
           case MotionEvent.ACTION_UP:
               System.out.println("ACTION_UP pointerCount="+pointerCount);
               break;
           case MotionEvent.ACTION_POINTER_1_DOWN:
               System.out.println("ACTION_POINTER_1_DOWN pointerCount="+pointerCount);
               break;
           case MotionEvent.ACTION_POINTER_1_UP:
               System.out.println("ACTION_POINTER_1_UP pointerCount="+pointerCount);
               break;
           case MotionEvent.ACTION_POINTER_2_DOWN:
               if (x0<width*0.5 && y0<height*0.5) {
                   if (x1>width*0.5 && y1>height*0.5) {
                       Toast.makeText(getApplicationContext(), "弹出窗口", Toast.LENGTH_SHORT).show();
                   }

               }
               System.out.println("ACTION_POINTER_2_DOWN pointerCount="+pointerCount);

               break;
           case MotionEvent.ACTION_POINTER_2_UP:
               System.out.println("ACTION_POINTER_2_UP pointerCount="+pointerCount);
               break;

           default:
               break;
           }

       }
       return super.onTouchEvent(event);
   }
}

还有一种相对简单的方法就是在屏幕的对角个写以一个view给view写点击事件

代码如下

package com.example.touch;

import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

   private View viewTop;
   private View viewBotton;
   private boolean isOnclickTop = false;
   private boolean isOnclickBottom = false;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       //初始化控件
       viewTop = findViewById(R.id.view_top);
       viewBotton = findViewById(R.id.view_bottom);

       initView();
   }

   private void initView() {
       // TODO Auto-generated method stub
       viewTop.setOnClickListener(this);
       viewBotton.setOnClickListener(this);

   }

   @Override
   public void onClick(View v) {
       // TODO Auto-generated method stub
       switch (v.getId()) {
       case R.id.view_top:
           isOnclickTop=true;

           new CountDownTimer(100,100) {

               @Override
               public void onTick(long arg0) {
                   // TODO Auto-generated method stub

               }

               @Override
               public void onFinish() {
                   // TODO Auto-generated method stub
                   isOnclickTop=false;
               }
           }.start();

           break;
       case R.id.view_bottom:
           isOnclickBottom=true;

           new Thread(new Runnable() {//也可以开启一个新的线程

               @Override
               public void run() {
                   // TODO Auto-generated method stub
                   isOnclickBottom=false;
               }
           }).start();

//           new CountDownTimer(100,100) {
//
//               @Override
//               public void onTick(long arg0) {
//                   // TODO Auto-generated method stub
//
//               }
//
//               @Override
//               public void onFinish() {
//                   // TODO Auto-generated method stub
//                   isOnclickBottom=false;
//               }
//           }.start();

           break;


       default:
           break;
       }
       if (isOnclickTop==true&&isOnclickBottom==true) {
           Toast.makeText(getApplicationContext(), "弹出窗口", Toast.LENGTH_SHORT).show();
       }

   }
}

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