[移动开发]android 程序中发送并接收事件

? ? 在某些情况下，需要在程序模拟一些系统事件（如键盘、触摸输入事件），完成远程控制或进行软件测试等工作，本文介绍了生成系统触摸事件并在程序中接收处理该事件。
? ? 1、生成一个android测试工程，本文工程名叫myTouch。
? ? 2、在工程中增加一个新的View类，类名myView，文件名myView.java,文件内容如下：
?

package com.mytouch;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by Administrator on 2022/2/24.
 */
public class myView extends View implements View.OnTouchListener{
    private Paint paint;
    private Rect rect;
    private int left;
    private int top;
    private int right;
    private int bottom;
    public myView (Context context) {
        super(context);
        initPaint();
        setOnTouchListener(this);
    }

    public myView (Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        initPaint();
        setOnTouchListener(this);
    }

    public myView (Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initPaint();
        setOnTouchListener(this);
    }

    private void initPaint() {
        paint=new Paint();
        left=100;
        top=100;
        right=300;
        bottom=300;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        paint.setColor(Color.GREEN);
        paint.setStyle(Paint.Style.STROKE);
        rect=new Rect(left,top,right,bottom);
        canvas.drawRect(rect,paint);
    }

????@Override
    public boolean onTouch(View v,MotionEvent e) {
    int action=e.getAction();
    switch (action) {
        case MotionEvent.ACTION_DOWN:
            Log.d("dhl", "down axisX:" + e.getX());
            Log.d("dhl", "down axisY:" + e.getY());
            break;
        case MotionEvent.ACTION_UP:
            Log.d("dhl", "up axisX:" + e.getX());
            Log.d("dhl", "up axisY:" + e.getY());
            break;
    }
    return false;
 }
}
3、修改程序布局文件activity_main.xml,增加一个按钮，一个上面定义的myView控件，修改后的代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.mytouch.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:id="@+id/textView"/>

    <Button
        android:layout_width="300dp"
        android:layout_height="100dp"
        android:text="New Button"
        android:id="@+id/button"
        android:layout_below="@+id/textView"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="0dp"/>
    <com.mytouch.myView
        android:id="@+id/custom_view"
        android:layout_width="300dp"
        android:layout_height="200dp"
        android:layout_below="@+id/button"
        android:background="#3F51B5"/>
   
</RelativeLayout>
4、在按钮中发送触摸事件，此处用到andriod的input命令，通过Runtime类执行该命令，发送触摸事件，程序如下：

bt.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        Process process=null;
        Process process1=null;
        try {
            for (int i=0;i<5;i++) {
                process = Runtime.getRuntime().exec("input tap 200 300");
                Log.d("dhl","send touch event");
            }
            /*
            BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(process.getInputStream()), 1024);
            String line = bufferedReader.readLine();
            while ( line != null) {
                Log.d("dhl","******:"+line);
            }
            */
        } catch ( IOException e) {
            e.printStackTrace();
        }
        return false;
    }
});
5、点击按钮，则自动向系统中发送了ACTION_DOWN的触摸事件，在myView的触摸事件响应函数中会接收到发送的ACTION_DOWN事件，注意发送事件的坐标是屏幕的物理坐标，坐标经过转换后应该落在myView之内，否则myView将接收不到该事件。
6、关于input命令可参考Android adb input 命令介绍_Lincoln 的专栏-CSDN博客_adb input textAndroid adb input 命令介绍（有些功能很像按键精灵的……研究一下也许能写按键精灵……233333）https://blog.csdn.net/soslinken/article/details/49587497