Android 给App保活（10种方案）

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1.Activity 1像素保活
public class Activity1 extends AppCompatActivity {

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_1);

    Window window = getWindow();
    window.setGravity(Gravity.LEFT|Gravity.TOP);
    WindowManager.LayoutParams layoutParams = window.getAttributes();
    layoutParams.width = 1;
    layoutParams.height = 1;
    layoutParams.x = 1;
    layoutParams.y = 1;
    window.setAttributes(layoutParams);
}

}

2.前台服务
public class ForegroundService extends Service {
private final static int SERVICE_ID = 1;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onCreate() {
    super.onCreate();

    if (Build.VERSION.SDK_INT<Build.VERSION_CODES.JELLY_BEAN_MR2){
        //4.3以下
        startForeground(SERVICE_ID,new Notification());
    }else if (Build.VERSION.SDK_INT<Build.VERSION_CODES.O){
        //7.0以下
        startForeground(SERVICE_ID,new Notification());
        //删除通知栏
        startService(new Intent(this,InnerService.class));
    }else {
        //8.0以上
        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        //NotificationManager.IMPORTANCE_MIN 通知栏消息的重要级别  最低，不让弹出
        //IMPORTANCE_MIN 前台时，在阴影区能看到，后台时 阴影区不消失，增加显示 IMPORTANCE_NONE时 一样的提示
        //IMPORTANCE_NONE app在前台没有通知显示，后台时有
        NotificationChannel channel = new NotificationChannel("channel", "keep", NotificationManager.IMPORTANCE_NONE);
        if (notificationManager!=null){
            notificationManager.createNotificationChannel(channel);
            Notification notification = new Notification.Builder(this, "channel").build();
            startForeground(SERVICE_ID,notification);
        }

    }
}


private static class InnerService extends Service{
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(KeepAliveApp.TAG, "onCreate: ");
        startForeground(SERVICE_ID,new Notification());
        stopSelf();
    }
}

}

3.广播拉活
在发生特定系统事件时，系统会发出广播，通过在 AndroidManifest 中静态注册对应的广播监听器，即可在发生响应事件时拉活。

    但是从android 7.0开始，对广播进行了限制，而且在8.0更加严格https://developer.android.google.cn/about/versions/oreo/background.html#broadcasts

    可静态注册广播列表： https://developer.android.google.cn/guide/components/broadcast-exceptions.html

4.利用系统机制拉活
START_STICKY：

“粘性”。如果service进程被kill掉，保留service的状态为开始状态，但不保留递送的intent对象。随后系统会尝试重新创建service，由于服务状态为开始状态，所以创建服务后一定会调用onStartCommand(Intent,int,int)方法。如果在此期间没有任何启动命令被传递到service，那么参数Intent将为null。

START_NOT_STICKY：

“非粘性的”。使用这个返回值时，如果在执行完onStartCommand后，服务被异常kill掉，系统不会自动重启该服务。

START_REDELIVER_INTENT：

重传Intent。使用这个返回值时，如果在执行完onStartCommand后，服务被异常kill掉，系统会自动重启该服务，并将Intent的值传入。

START_STICKY_COMPATIBILITY：

START_STICKY的兼容版本，但不保证服务被kill后一定能重启。

只要 targetSdkVersion 不小于5，就默认是 START_STICKY。但是某些ROM 系统不会拉活。并且经过测试，Service 第一次被异常杀死后很快被重启，第二次会比第一次慢，第三次又会比前一次慢，一旦在短时间内 Service 被杀死4-5次，则系统不再拉起。

public class StickyService extends Service {

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return super.onStartCommand(intent, flags, startId);
}

}
5.账户同步拉活
/**

创建可添加用户
*/
public class AuthenticationService extends Service { private AccountAuthenticator accountAuthenticator; @Nullable
@Override
public IBinder onBind(Intent intent) {
return accountAuthenticator.getIBinder();
} @Override
public void onCreate() {
super.onCreate();
accountAuthenticator = new AccountAuthenticator(this);
} public static class AccountAuthenticator extends AbstractAccountAuthenticator { public AccountAuthenticator(Context context) { super(context); } @Override public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) { return null; } @Override public Bundle addAccount(AccountAuthenticatorResponse response, String accountType, String authTokenType, String[] requiredFeatures, Bundle options) throws NetworkErrorException { return null; } @Override public Bundle confirmCredentials(AccountAuthenticatorResponse response, Account account, Bundle options) throws NetworkErrorException { return null; } @Override public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException { return null; } @Override public String getAuthTokenLabel(String authTokenType) { return null; } @Override public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException { return null; } @Override public Bundle hasFeatures(AccountAuthenticatorResponse response, Account account, String[] features) throws NetworkErrorException { return null; } }
}

public class AccountHelper {
private static final String TAG = “AccountHelper”;

private static final String ACCOUNT_TYPE = "com.zsl.keepalive.account";
private static final String AUTHORITY = "com.zsl.keepalive.provider";

/**
 * 添加账号
 *
 * @param context
 */
public static void addAccount(Context context) {
    AccountManager accountManager = (AccountManager) context.getSystemService(Context.ACCOUNT_SERVICE);
    // 获得此类型的账户
    // 需要增加权限  GET_ACCOUNTS
    Account[] accounts = accountManager.getAccountsByType(ACCOUNT_TYPE);
    if (accounts.length > 0) {
        Log.e(TAG, "账户已存在");
        return;
    }
    Account account = new Account("zsl", ACCOUNT_TYPE);
    // 给这个账户类型添加一个账户
    // 需要增加权限  AUTHENTICATE_ACCOUNTS
    accountManager.addAccountExplicitly(account, "keepalive", new Bundle());
}

/**
 * 设置账户自动同步
 */
public static void autoSync() {
    Account account = new Account("zsl", ACCOUNT_TYPE);
    // 下面三个都需要同一个权限  WRITE_SYNC_SETTINGS
    // 设置同步
    ContentResolver.setIsSyncable(account, AUTHORITY, 1);
    // 自动同步
    ContentResolver.setSyncAutomatically(account, AUTHORITY, true);
    // 设置同步周期
    ContentResolver.addPeriodicSync(account, AUTHORITY, new Bundle(), 1);
}

}

public class SyncService extends Service {

private SyncAdapter mSyncAdapter;

private static final String TAG = "SyncService";

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return mSyncAdapter.getSyncAdapterBinder();
}

@Override
public void onCreate() {
    super.onCreate();
    mSyncAdapter = new SyncAdapter(getApplicationContext(), true);
}

public static class SyncAdapter extends AbstractThreadedSyncAdapter {

    public SyncAdapter(Context context, boolean autoInitialize) {
        super(context, autoInitialize);
    }

    @Override
    public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
        Log.e(TAG, "同步账户");
        //与互联网 或者 本地数据库同步账户
    }
}

}

public class SyncProvider extends ContentProvider {
@Override
public boolean onCreate() {
return false;
}

@Nullable
@Override
public Cursor query(@NonNull Uri uri, @Nullable String[] projection, @Nullable String selection,
                    @Nullable String[] selectionArgs, @Nullable String sortOrder) {
    return null;
}

@Nullable
@Override
public String getType(@NonNull Uri uri) {
    return null;
}

@Nullable
@Override
public Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {
    return null;
}

@Override
public int delete(@NonNull Uri uri, @Nullable String selection, @Nullable String[] selectionArgs) {
    return 0;
}

@Override
public int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection,
                  @Nullable String[] selectionArgs) {
    return 0;
}

}

6.JobScheduler拉活
JobScheduler允许在特定状态与特定时间间隔周期执行任务。可以利用它的这个特点完成保活的功能,效果即开启一个定时器，与普通定时器不同的是其调度由系统完成。同样在某些ROM可能并不能达到需要的效果

public class KeepAliveJobService extends JobService {
@Override
public boolean onStartJob(JobParameters jobParameters) {
if (Build.VERSION.SDK_INT>= Build.VERSION_CODES.O){
startJob(this);
}
return false;
}

private void startJob(Context context) {
    JobScheduler jobScheduler = (JobScheduler) context.getSystemService(JOB_SCHEDULER_SERVICE);
    JobInfo.Builder builder = new JobInfo.Builder(27,
            new ComponentName(context.getPackageName(), KeepAliveJobService.class.getName()))
            .setPersisted(true);
    if (Build.VERSION.SDK_INT<Build.VERSION_CODES.N){
        builder.setPeriodic(1000);
    }else {
        builder.setMinimumLatency(1000);
    }
    jobScheduler.schedule(builder.build());

}

@Override
public boolean onStopJob(JobParameters jobParameters) {
    return false;
}

}

7.双进程守护
AIDL+JobScheduler 实现

// IMyAidlInterface.aidl
package com.zsl.keepalive;

// Declare any non-default types here with import statements

interface IMyAidlInterface {

}
public class LocalService extends Service {

private static final String TAG = "LocalService ";
private ServiceConnection serviceConnection;
private static final int SERVICE_ID = 16;
private MyBinder myBinder;

class MyBinder extends IMyAidlInterface.Stub {
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return myBinder;
}

@Override
public void onCreate() {
    super.onCreate();
    myBinder = new MyBinder();
    serviceConnection = new MyServiceConnection();

    // 让服务变成前台服务
    startForeground(SERVICE_ID, new Notification());
    // 如果18以上的设备 使用相同id再次启动一个前台服务 然后结束这个服务
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
        startService(new Intent(this, InnerService.class));
    }
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    bindService(new Intent(this, RemoteService.class),
            serviceConnection, BIND_AUTO_CREATE);
    return super.onStartCommand(intent, flags, startId);
}

class MyServiceConnection implements ServiceConnection {

    // 服务连接后回调
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
    }

    // 连接中断后回调
    @Override
    public void onServiceDisconnected(ComponentName name) {
        Log.e(TAG, "RemoteService 可能被杀死了，拉活");

        startService(new Intent(LocalService.this, RemoteService.class));
        bindService(new Intent(LocalService.this, RemoteService.class),
                serviceConnection, BIND_AUTO_CREATE);
    }
}

public static class InnerService extends Service {

    @Override
    public void onCreate() {
        super.onCreate();
        startForeground(SERVICE_ID, new Notification());
        stopSelf();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

}

public class RemoteService extends Service {

private static final String TAG = "RemoteService ";
private ServiceConnection serviceConnection;
private static final int SERVICE_ID = 16;
private MyBinder myBinder;
class MyBinder extends IMyAidlInterface.Stub {
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return myBinder;
}

@Override
public void onCreate() {
    super.onCreate();
    myBinder = new MyBinder();
    serviceConnection = new MyServiceConnection();

    // 让服务变成前台服务
    startForeground(SERVICE_ID, new Notification());
    // 如果18以上的设备 使用相同id再次启动一个前台服务 然后结束这个服务
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
        startService(new Intent(this, InnerService.class));
    }
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    bindService(new Intent(this, LocalService.class),
            serviceConnection, BIND_AUTO_CREATE);
    return super.onStartCommand(intent, flags, startId);
}

class MyServiceConnection implements ServiceConnection {

    // 服务连接后回调
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
    }

    // 连接中断后回调
    @Override
    public void onServiceDisconnected(ComponentName name) {
        Log.e(TAG, "LocalService 可能被杀死了，拉活");

        startService(new Intent(RemoteService.this, LocalService.class));
        bindService(new Intent(RemoteService.this, LocalService.class),
                serviceConnection, BIND_AUTO_CREATE);
    }
}

public static class InnerService extends Service {

    @Override
    public void onCreate() {
        super.onCreate();
        startForeground(SERVICE_ID, new Notification());
        stopSelf();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

}

KeepAliveJobService .java

@Override
public boolean onStartJob(JobParameters params) {
Log.e(TAG, “onStartJob”);

    // 如果7.0以上 轮询
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        startJob(this);
    }
    boolean isLocal = Utils.isRunningService(this, LocalService.class.getName());
    boolean isRemote = Utils.isRunningService(this, RemoteService.class.getName());
    if (!isLocal || !isRemote) {
        startService(new Intent(this, LocalService.class));
        startService(new Intent(this, RemoteService.class));
    }
    return false;
}

public class Utils {

public static boolean isRunningService(Context context, String name) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningServiceInfo> runningServices = am.getRunningServices(100);
    for (ActivityManager.RunningServiceInfo info : runningServices) {
        if (TextUtils.equals(info.service.getClassName(), name)) {
            return true;
        }
    }
    return false;
}

}
8.播放无声音乐
略

9.WorkManager
public class KeepLiveWork extends Worker {

public KeepLiveWork(@NonNull Context context, @NonNull WorkerParameters workerParams) {
    super(context, workerParams);
}

@NonNull
@Override
public Result doWork() {
    Log.e("KeepAlive", "doWork: ");

    KeepAliveJobService.startJob(getApplicationContext());

    return Result.success();
}

}

添加任务

OneTimeWorkRequest oneTimeWorkRequest = new OneTimeWorkRequest
.Builder(KeepLiveWork.class)
.setInitialDelay(10, TimeUnit.SECONDS)
.build();

    WorkManager.getInstance(this).enqueue(oneTimeWorkRequest);

10.厂商白名单
终极保活，需要厂商定制

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