Android应用关闭的情况以及识别方法详解

<receiver
    android:name=".app.receiver.ShutdownReceiver"
    android:enabled="true"
    android:exported="true">
    <intent-filter android:priority="1000">
        <!-- 关机广播 -->
        <action android:name="android.intent.action.ACTION_SHUTDOWN" />
        <!-- 手机启动完成监听 -->
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</receiver>

public static int getBatteryLevel(Context context) {
    if(context == null){
        return -1;
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        BatteryManager batteryManager = (BatteryManager) context.getSystemService(BATTERY_SERVICE);
        if (batteryManager == null) {
            return -1;
        }
        return batteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);
    } else {
        ContextWrapper wrapper = new ContextWrapper(context.getApplicationContext());
        Intent intent = wrapper.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
        int power = -1;
        if(intent != null)power = (intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) * 100) / intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        return power;
    }
}

public class PowerUtils {
    //华为电源管理(设置省电的地方)
    public static Intent getPowerSaveModeIntent() {
        Intent intent = new Intent();
        intent.setComponent(new ComponentName("com.huawei.systemmanager", "com.huawei.systemmanager.power.ui.HwPowerManagerActivity"));
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        return intent;
    }
    /**
     * @param context
     * @return 1 省电模式
     */
    public static int shouldShowPowerSaveModeOption(Context context) {
        int a = b();
        if (a != 1) {
            return a;
        }
        try {
            ActivityInfo resolveActivityInfo = getPowerSaveModeIntent().resolveActivityInfo(context.getPackageManager(), 0);
            if (resolveActivityInfo == null || !resolveActivityInfo.exported) {
                return -1;
            }
            return a;
        } catch (Exception e) {
            return -1;
        }
    }
    private static boolean isHuaWeiDevice() {
        String brand = Build.BRAND;
        if (brand == null) return false;
        brand = brand.toLowerCase();
        if ("huawei".contains(brand)) {
            return true;
        }
        if ("magic".contains(brand)) {
            return true;
        }
        return "honor".contains(brand);
    }
    private static int b() {
        if (Build.VERSION.SDK_INT < 24 || !isHuaWeiDevice()) {// || !LoggerFactory.getDeviceProperty().isHuaweiDevice()
            return -1;
        }
        if (i()) {
            return 1;
        }
        return 0;
    }
    private static boolean i() {
        return "false".equals(d("persist.sys.performance"));
    }
    private static Method dd;
    private static String d(String str) {
        try {
            if (dd == null) {
                dd = Class.forName("android.os.SystemProperties").getMethod("get", new Class[]{String.class});
            }
            return (String) dd.invoke(null, new Object[]{str});
        } catch (Throwable th) {
            return null;
        }
    }
}

<application
     android:largeHeap="true">
</application>

//系统正运行于低内存的状态，应用随时可能被关闭
public void onLowMemory() {
}
//预示着你设备的内存资源已经开始紧张，此时尽量释放非必要内存资源
public void onTrimMemory(int level) {
}

//动态注册开锁屏事件监听
filter.addAction(Intent.ACTION_SCREEN_ON)
filter.addAction(Intent.ACTION_SCREEN_OFF)
filter.addAction(Intent.ACTION_USER_PRESENT)

////动态注册手机菜单、HOME键事件监听
filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)