全志 Android 11：实现响应全局按键

一、篇头

最近实现热键想功能，简单总结了下全志平台Android 11 的响应全局热键的方法。

二、需求

实现全局热键，响应F-、AF、F+三个按键，AF只用于启动调焦界面，F-和F+除了可以启动调焦界面外，还用于调整镜头的焦距（控制步进电机进退）。

三、按键配置

配置方法略，可参考本人红外或蓝牙的按键配置的相文章。

• 如下在kl文件中添加3个按键
• ZOOM_IN和ZOOM_OUT用于控制调焦电机的进和退，也用于启动调焦界面
• APP_SWITCH 暂用于启动调焦界面

key 53   ZOOM_IN  //对应遥控器的F-
key 52   ZOOM_OUT //对应遥控器的F+
key 64   APP_SWITCH //对应遥控器的AF

四、代码实现

4.1 全局按键响应：TvWindowManager.java

• 位置：android\frameworks\base\services\core\java\com\android\server\policy\TvWindowManager.java

    @Override
    public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
        int keyCode = event.getKeyCode();
        final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
		Log.d(TAG,"key event key = " + KeyEvent.keyCodeToString(keyCode));

…… 略…… 
        if (down) {

…… 略…… 

                case KeyEvent.KEYCODE_APP_SWITCH:
                case KeyEvent.KEYCODE_ZOOM_IN:
                case KeyEvent.KEYCODE_ZOOM_OUT:
					 //（1）判断当前topActivity，如果已经打开了调焦界面，则不再启动
                     if (mActivityManager == null)
                         mActivityManager = (ActivityManager)mContext.getSystemService(Context.ACTIVITY_SERVICE);
                     ComponentName cn = mActivityManager.getRunningTasks(1).get(0).topActivity;
                     String ActivityName = cn.getClassName();
                     Log.d(TAG, "current activity is " + ActivityName);
                     if (ActivityName.contains("cictech.projector.FocusActivity")) {
                         Log.d(TAG, " do NOT start FocusActivity ");
                         break;
                     }
					//（2）启动调焦界面
                    Log.d(TAG, " Key down to start FocusActivity ");
                    Intent focusIntent = new Intent();
                    focusIntent.setComponent(new ComponentName("com.android.tv.settings", "com.android.tv.settings.szhou.projector.FocusActivity"));
                    focusIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
                    focusIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    mContext.startActivity(focusIntent);
                    break;

4.2 调焦界面：FocusActivity.java

public class FocusActivity extends Activity {

    private final String TAG = "FocusActivity";
    private JniMotor mJniMotor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_focus);
        mJniMotor = new JniMotor();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        switch (keyCode){
            case KeyEvent.KEYCODE_ZOOM_IN:
            {
                //right
                Log.d(TAG, "KEYCODE_ZOOM_IN + 5" + mJniMotor.ioctl(1, 5));
            }
            break;
            case KeyEvent.KEYCODE_ZOOM_OUT:
            {
                //left
                Log.d(TAG, "KEYCODE_ZOOM_OUT -5 " + mJniMotor.ioctl(2, 5));
            }
            break;
            default:
                return super.onKeyDown(keyCode, event);
        }
        return true;
    }
}

4.3 调试打印

• Andorid 打印如下