代码执行返回事件

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(3000);
//                    MainActivity.this.onKeyDown(KeyEvent.KEYCODE_BACK, null);
//                    onKeyEvent(KeyEvent.KEYCODE_BACK);
//                    sendKeyCode1(KeyEvent.KEYCODE_BACK);
                    sendKeyCode2(KeyEvent.KEYCODE_BACK);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();
//        onKeyEvent(KeyEvent.KEYCODE_BACK);
    }

    public static void onKeyEvent(final int keyCode) {
        new Thread() {
            public void run() {
                try {
                    Instrumentation inst = new Instrumentation();
                    inst.sendKeyDownUpSync(keyCode);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }

    private void sendKeyCode1(int keyCode) {
        try {
            String keyCommand = "input keyevent " + keyCode;
            // 调用Runtime模拟按键操作
            Runtime.getRuntime().exec(keyCommand);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void sendKeyCode2(final int keyCode) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    // 创建一个Instrumentation对象
                    Instrumentation inst = new Instrumentation();
                    // 调用inst对象的按键模拟方法
                    inst.sendKeyDownUpSync(keyCode);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}