Android中监控home键

一、需求

在应用开发过程中，启动服务开启线程锁等待服务返回解锁，为了避免点击home键使线程锁卡死的bug，需要监控home键，解锁线程。

二、实现

在应用时，需要register和unregister。

public class HomeWatcherReceiver extends BroadcastReceiver {
    private static final String SYSTEM_DIALOG_REASON_KEY = "reason";
    private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
    private OnKeyListener listener;

    @Override
    public void onReceive(Context context, Intent intent) {

        String intentAction = intent.getAction();
        if (TextUtils.equals(intentAction, Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
            String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
            if (TextUtils.equals(SYSTEM_DIALOG_REASON_HOME_KEY, reason)) {
                listener.onHomeKey();
            }
        }
    }

    public void registerHomeKeyReceiver(Context context) {
        IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
        context.registerReceiver(this, homeFilter);
    }

    public void unregisterHomeKeyReceiver(Context context) {
        context.unregisterReceiver(this);
    }

    public void setListener(OnKeyListener listener) {
        this.listener = listener;
    }

    @FunctionalInterface
    public interface OnKeyListener {
        void onHomeKey();
    }
}