[移动开发]安卓模拟系统发送返回键值(KEYCODE_BACK)

实验环境：

Android5.1?

不用系统platform签名，但root 了

代码

package com.hisense.sendbackkey;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Instrumentation;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


    }


    public void sendBack() {
        new Thread() {
            public void run() {
                try {
                    Instrumentation inst = new Instrumentation();
                    inst.sendKeyDownUpSync(KeyEvent.KEYCODE_BACK);
                } catch (Exception e) {
                }
            }
        }.start();
    }

    public void sendBack2(){
        try {
            Runtime runtime = Runtime.getRuntime();
            runtime.exec("input keyevent " + KeyEvent.KEYCODE_BACK);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    public void onBtnBack(View view){
        Log.i(TAG, "点了BACK 请求返回键");
        //sendBack();
        sendBack2();
    }

}

以上2个办法都可以实现返回键

有人説要加这个权限，实际意义不大。

<uses-permission android:name="android.permission.INJECT_EVENTS" />