Android 应用在后台

Question

我必须创建应用程序并希望在 phone 工作时始终使用它，目前我的代码是：

Android 清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.plan.pedometer">
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:enabled="true"
                 android:name=".PedometerService"/>
        <receiver
            android:name=".receiver.StartPedometerServiceAtBootReceiver"
            android:label="StartPedometerServiceAtBootReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

StartPedometerServiceAtBootReceiver:

public class StartPedometerServiceAtBootReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
            Intent serviceIntent = new Intent(context, PedometerService.class);
            context.startService(serviceIntent);
        }
    }
}

服务：

public class PedometerService extends IntentService {

    private int Steps=0;

    public PedometerService() {
        super("Pedometer_Worker_Thread");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        putInSharedPreferences();
        synchronized (this) {
            try {
                wait(1000000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public void putInSharedPreferences(){
        stepsNumbers = getApplicationContext().getSharedPreferences("stepsData", MODE_PRIVATE);
        editorStepsNumbers=stepsNumbers.edit();
        editorStepsNumbers.putInt(String.valueOf(STEPS),Steps).apply();
    }

}

如果我在 MainActivity 中开始 Service，它会起作用：

Intent intent = new Intent(getApplication(),PedometerService.class);
                startService(intent);

并且服务在后台运行但是当我重新启动 phone 时没有任何反应并且服务没有启动。我还有一个问题，这是 Pedometer 应用程序，我应该将 onSensorChange 方法放在服务中的什么位置？在 onHandleIntent() 中创建类似 while(1) 的内容并将其放在那里？

更新 - 我的实际代码是：

我遵循了这个教程https://github.com/codepath/android_guides/wiki/Starting-Background-Services 并尝试使用 WakefulBroadcastReceiver Android清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.plan.pedomoter">
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service
            android:name="com.plan.pedomoter.MyTestService"
            android:exported="false"/>
        <receiver android:name="com.plan.pedomoter.BootBroadcastReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

主要活动：

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    @Override
    protected void onStart() {
        super.onStart();
        launchTestService();
    }
    public void launchTestService() {
        // Construct our Intent specifying the Service
        Intent i = new Intent(this, MyTestService.class);
        // Add extras to the bundle
        i.putExtra("foo", "bar");
        // Start the service
        startService(i);
    }
}

接收者：

public class BootBroadcastReceiver extends WakefulBroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // Launch the specified service when this message is received
        Intent startServiceIntent = new Intent(context, MyTestService.class);
        startWakefulService(context, startServiceIntent);
    }
}

服务：

public class MyTestService extends IntentService {
    Handler handler;
    // Must create a default constructor
    public MyTestService() {
        // Used to name the worker thread, important only for debugging.
        super("test-service");
    }
    @Override
    public void onCreate() {
        super.onCreate(); // if you override onCreate(), make sure to call super().
        // If a Context object is needed, call getApplicationContext() here.
        handler = new Handler();
    }
    @Override
    protected void onHandleIntent(Intent intent) {
        WakefulBroadcastReceiver.completeWakefulIntent(intent);
        handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(MyTestService.this, "start", Toast.LENGTH_LONG).show();
                int i = 0;
            }
        });
        int i=0;
        while(true){
            i++;
            // Do some work here
            if(i>1000)
                i=0;
        }
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(MyTestService.this, "stop", Toast.LENGTH_SHORT).show();
    }
}

我在 MyTestService 中使用 while(true) 来检查应用程序是否在后台运行，在项目中我将使用传感器（这是计步器应用程序）然后我想放一些类似 MyAlarmReceiver 的东西从教程每天多次向服务器发送数据。

Answer 1

试试这个 Manifest.xml

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.mkonuk.rebootapplication">

    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <service android:name=".MyService"/>

        <receiver android:name=".MyBootReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </receiver>


        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity

    public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startService(new Intent(getBaseContext(),MyService.class));
    }
}

我的服务

 public class MyService extends Service {

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(getApplicationContext(),"Service started",Toast.LENGTH_LONG).show();
        return START_STICKY;
    }


    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(getApplicationContext(),"Service Destroyed",Toast.LENGTH_LONG).show();
    }

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

MyBootReceiver

    public class MyBootReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent service  = new Intent(context,MyService.class);
        context.startService(service);
    }
}

我已经测试过什么时候应用程序启动服务会启动，即使你的应用程序被破坏服务也会启动again.Even如果重启android设备服务会启动。

第二个问题：如果您将传感器与服务一起使用，则需要在服务销毁时注册传感器侦听器并取消注册传感器侦听器，oncreate 方法覆盖传感器对象并创建传感器和传感器 manager.In onstartCommand 方法注册生成的传感器侦听器传感器管理器对象，在服务时取消注册侦听器破坏你可以检查这个 link Accelemeter in android

如果你想从服务发送消息到 activity，你必须实现 onbind() 方法，activity 需要绑定服务检查这个 link bind activity on service using sensor

bind/unbind service

Answer 2

你好，我是个新手，正在寻找一些帮助，（这不是答案）我无法添加任何其他评论我正在尝试执行类似的应用程序，我遵循了 mithat 显示的内容，然后当我关闭时我的手机好像启动了，但是就在我输入手机密码的时候，它出现了一个系统吐司，上面写着"app Stop"，所以我无法获取它。即使我从“最近的应用程序”中扫过应用程序，它也会显示 "app Stop" 我愿运行它永远，谢谢

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