Android 10关机界面定制

在 Android 10 中,我们可以通过定制关机界面来为用户提供更好的体验。在本文中,我们将介绍如何定制 Android 10 关机界面,并提供代码示例来帮助读者理解。

关机界面定制流程

下面是关机界面定制的流程图:

flowchart TD
    A[创建自定义界面] --> B[注册BroadcastReceiver]
    B --> C[为BroadcastReceiver指定IntentFilter]
    C --> D[创建SystemService]
    D --> E[在BroadcastReceiver中进行UI定制]
    E --> F[在SystemService中调用自定义UI]

创建自定义界面

首先,我们需要创建一个自定义界面,用于替换原始的关机界面。可以使用XML布局文件来定义界面的样式和布局。以下是一个简单的示例:

<!-- custom_shutdown_layout.xml -->
<LinearLayout xmlns:android="
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Custom Shutdown Screen"
        android:textSize="20sp"
        android:gravity="center"
        android:layout_gravity="center_horizontal" />

    <!-- 添加其他自定义视图 -->

</LinearLayout>

注册BroadcastReceiver

接下来,我们需要注册一个 BroadcastReceiver,用于接收系统发送的关机广播。在 BroadcastReceiver 中,我们可以对关机事件进行处理,并将自定义界面显示出来。

// CustomShutdownReceiver.java
public class CustomShutdownReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SHUTDOWN)) {
            // 显示自定义界面
            showCustomShutdownScreen(context);
        }
    }

    private void showCustomShutdownScreen(Context context) {
        Intent shutdownIntent = new Intent(context, CustomShutdownActivity.class);
        shutdownIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(shutdownIntent);
    }
}

为BroadcastReceiver指定IntentFilter

为了让 BroadcastReceiver 接收到关机广播,我们需要在 AndroidManifest.xml 文件中为它指定相应的 IntentFilter。

<!-- AndroidManifest.xml -->
<manifest>
    <application>
        <receiver android:name=".CustomShutdownReceiver">
            <intent-filter>
                <action android:name="android.intent.action.ACTION_SHUTDOWN" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

创建SystemService

为了能够调用自定义界面,我们需要创建一个 SystemService。SystemService 是一个单例类,可以在其中封装一些关于关机界面的逻辑。

// CustomShutdownService.java
public class CustomShutdownService extends SystemService {
    private static final String TAG = "CustomShutdownService";

    private WindowManager mWindowManager;
    private View mView;

    public CustomShutdownService(Context context) {
        super(context);
        mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    }

    @Override
    public void onStart() {
        super.onStart();
        Log.d(TAG, "onStart");
    }

    @Override
    public void onStop() {
        super.onStop();
        Log.d(TAG, "onStop");
    }

    public void showCustomShutdownScreen() {
        mView = LayoutInflater.from(getContext()).inflate(R.layout.custom_shutdown_layout, null);
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);
        mWindowManager.addView(mView, params);
    }

    public void hideCustomShutdownScreen() {
        if (mView != null) {
            mWindowManager.removeView(mView);
            mView = null;
        }
    }
}

在BroadcastReceiver中进行UI定制

在 BroadcastReceiver 中,我们可以调用 SystemService 的方法来显示和隐藏自定义界面。

// CustomShutdownReceiver.java
public class CustomShutdownReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SHUTDOWN)) {
            // 显示自定义界面
            CustomShutdownService customShutdownService = (CustomShutdownService)
                    context.getSystemService(Context.CUSTOM_SHUTDOWN_SERVICE);
            customShutdownService.showCustomShutdownScreen();
        }
    }
}

在SystemService中调用自定义UI

最后,我们需要在 SystemService 中调用自定义界面的方法来显示和隐藏自定义界面。

// CustomShutdownService.java
public class CustomShutdownService extends SystemService {
    // ...

    @Override