Home键监听与电源键

最新推荐文章于 2024-06-13 11:45:49 发布

原创最新推荐文章于 2024-06-13 11:45:49 发布 · 8.5k 阅读

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本文介绍了如何在Android应用中实现对Home键和电源键的监听。通过创建BroadcastReceiver，可以监听到Home键被按下，并在相应事件中执行自定义逻辑。同时，文章也展示了如何在权限设置中加入"android.permission.WAKE_LOCK"，以便监听电源键（屏幕关闭）事件。在onCreate和onDestroy方法中进行接收器的注册与注销，以防止错误。

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Home键监听

编写广播接收器

    private final BroadcastReceiver homePressReceiver = new BroadcastReceiver() {
        final String SYSTEM_DIALOG_REASON_KEY = "reason";
        final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if(action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
                String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
                if(reason != null
                        && reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
                    // 自己随意控制程序，关闭...
                }
            }
        }

在onCreate中注册接收器

        final IntentFilter homeFilter = new IntentFilter(
                Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
        registerReceiver(homePressReceiver, homeFilter);

在onDestory()中解除注册防止报错

        if(homePressReceiver != null) {
            try {
                unregisterReceiver(homePressReceiver);
            }
            catch(Exception e) {
            }
        }

电源键监听

首先，我们是要获取系统权限

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

监听Action

    // Intent.ACTION_SCREEN_OFF;
    // Intent.ACTION_SCREEN_ON;
    private final BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(final Context context, final Intent intent) {
            final String action = intent.getAction();
            if(Intent.ACTION_SCREEN_OFF.equals(action)) {

            }
        }
    };
    // onCreate()方法中注册
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
    registerReceiver(mBatInfoReceiver, filter);

    // onDestory()方法中解除注册
    if(mBatInfoReceiver != null) {
        try {
            unregisterReceiver(mBatInfoReceiver);
        }
        catch(Exception e) {
       }
    }