runOnUiThread从服务到活动

时间：2016-06-04 19:35:51

标签： android android-service

我有一个方法“send（）”，它将值发送到服务器，然后从服务器获得响应0或1。然后我想激活一个方法，检查它的0或1，然后我想激活一个从服务调用MainActivity的方法。

这是服务代码 

    public class SendThreadCommunication extends Thread {
private final static String TAG = "SendThreadCommunication";
private final int READ_TIMEOUT = 100000;
private final int CONNECTION_TINEOUT = 100000;
private Looper myLooper;
private int mResponseCode;
private String mData = "";

private final ServerRequest req;
// private RegisterUser user;
private static String ans;

public SendThreadCommunication(ServerRequest req) {

    this.req = req;
}

public String readWebData(InputStream stream) {

    String line = "";
    StringBuffer buffer = new StringBuffer();
    BufferedReader reader = new BufferedReader(new InputStreamReader(stream));

    try {
        while ((line = reader.readLine()) != null) {
            buffer.append(line);
        }
        reader.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block

    }
    return buffer.toString();

}

@Override
public void run() {
    try {
        send();
       // evaluateDataAndRespondToFragment(mData);
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}


public void send() throws ClientProtocolException, IOException {
    OutputStream mOutputStream = null;
    BufferedWriter mWriter = null;

    List<NameValuePair> mParameters = req.getParameters();

    URL url = null;
    HttpURLConnection connection = null;
    try {
        Looper.prepare();
        url = new URL(req.returnRequestUrl());
        connection = (HttpURLConnection) url.openConnection();
        connection.setReadTimeout(READ_TIMEOUT);
        connection.setConnectTimeout(CONNECTION_TINEOUT);
        connection.setRequestMethod(Params.HTTP_REQUEST_METHOD_POST);
        connection.setDoOutput(true);
        connection.setDoInput(true);
        mOutputStream = connection.getOutputStream();
        mWriter = new BufferedWriter(new OutputStreamWriter(mOutputStream, Params.UTF8));
        String sparams = URLEncodedUtils.format(mParameters, Params.UTF8);
        mWriter.write(sparams);
        mWriter.flush();

        mResponseCode = connection.getResponseCode();
        if (mResponseCode > 203) {
            mData = readWebData(connection.getErrorStream());
            //this.req.getResponse().notGoodServerEroorr();
        } else {
            mData = readWebData(connection.getInputStream());

        }

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {
        if (connection != null) {
            try {
                if (mOutputStream != null)
                    mOutputStream.close();
                if (mWriter != null)
                    mWriter.close();

            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            connection.disconnect();
            evaluateDataAndRespondToFragment(mData);
            myLooper = Looper.myLooper();
            Looper.loop();
            myLooper.quit();

        }
    }
  }

private void evaluateDataAndRespondToFragment(String mData) {
    Listen lis = this.req.getResponse();

    if (mData.equals("1"))
        lis.good();
    else
        lis.notGood();

     if (mData.equals("0"))
     {
         lis.userGcmNotRegistered();
     }
    }
 }

此服务代码发送到服务器的值并获得响应。方法“evaluateDataAndRespondToFragment”检查其是0还是1，然后激活相应的方法。该方法应该触发MainActivity中的其他方法。 我知道 runOnUiThread 处理这个，但我不知道如何使用它。 MainActivity上的方法更改了UI。

这是MainActivity代码 

  public class MainActivity extends Activity implements SensorEventListener, Listen {

private BroadcastReceiver statusReceiver;
private IntentFilter mIntent;
Sensor accelerometer;
SensorManager sm;
TextView acceleration;
SendValues sv;
int counter3 = 0;
int counter5 = 0;
int pastTime = 0;

private static final String TAG = "MainActivity";

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


@Override
public void good() {
    Toast.makeText(getApplication(), "successful transfer", Toast.LENGTH_LONG).show();
}

@Override
public void notGood() {
    Toast.makeText(getApplication(), "UNsuccssful transfer", Toast.LENGTH_LONG).show();
}

@Override
public void userGcmNotRegistered() {
    Toast.makeText(getApplication(), "There is some problem, please register again to the App", Toast.LENGTH_LONG).show();
  }

}

这里它应该激活其中一种方法“好”，“不好”.... 我知道 runOnUiThread 处理它，但我不知道如何使用它和在哪里。 如果有人能告诉我该怎么做，我会很感激。

2 个答案:

答案 0 :(得分：1)

服务没有 runOnUiThread 方法，但您可以使用意图代替。

简单地说，

  1. 为您的活动添加 BroadcastReceiver ，
  2. 将接收器添加到 AndroidManifest.xml ，
  3. 从您的服务中发送意图。

    4. <强> MainActivity.java 

    public class MainActivity extends Activity implements SensorEventListener, Listen {

    private BroadcastReceiver statusReceiver;
    private IntentFilter mIntent;
    Sensor accelerometer;
    SensorManager sm;
    TextView acceleration;
    SendValues sv;
    int counter3 = 0;
    int counter5 = 0;
    int pastTime = 0;

    private static final String TAG = "MainActivity";

    statusReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                switch(intent.getIntExtra("status", -1) {
                    case 1:
                        good();
                        break;
                    case 2:
                        notGood();
                        break;
                    default:
                        userGcmNotRegistered();
                }
            }
        };

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

        registerReceiver(statusReceiver, new IntentFilter("com.yourpackage.yourapp.GET_STATUS_INTENT");
        }


    @Override
    public void good() {
        Toast.makeText(getApplication(), "successful transfer", Toast.LENGTH_LONG).show();
    }

    @Override
    public void notGood() {
        Toast.makeText(getApplication(), "UNsuccssful transfer", Toast.LENGTH_LONG).show();
    }

    @Override
    public void userGcmNotRegistered() {
        Toast.makeText(getApplication(), "There is some problem, please register again to the App", Toast.LENGTH_LONG).show();
      }

    }

    一个简单的 AndroidManifest.xml 

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.yourpackage.yourapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="19"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.yourpackage.yourapp.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <receiver android:name="MainActivity">
                <intent-filter>
                        <action android:name="com.yourpackage.yourapp.GET_STATUS_INTENT">
                        </action>
                </intent-filter>
     </receiver>
    </application>
</manifest>

    evaluateDataAndRespondToFragment 方法

    private void evaluateDataAndRespondToFragment(String mData) {

    Intent intent = new Intent("com.yourpackage.yourapp.GET_STATUS_INTENT");
    intent.putExtra(status, mData);
    sendBroadcast(intent);

    }
 }

    此外，您需要在活动的onResume / onPause方法中注册/取消注册。

答案 1 :(得分：0)

有点关闭主题;但是，Beremaran的答案是正确的，你无法从服务中获得主线程。但是，runOnUiThread是一个非常重要的知识和使用概念，以避免阻塞主线程。阻止主线程将导致系统终止您的应用。

假设你有一些网络任务要做，你知道这可能需要一些时间。因此，你开始一个新的线程来做慢工作。

new Thread(new Runnable() {
    @Override
    public void run() {
       messageFromSlowStuff = doSomeSlowStuff();
    };
}).start();

现在您可能希望使用新数据 messageFromSlowStuff 填充UI，但您不能，因为它只是来自主线程。 

getActivity().runOnUiThread(new Runnable() {
    @Override
    public void run() {
        myTextView.setText(messageFromSlowStuff)
    }
});

如果您只是按照上面的示例更新视图，则可以使用View.post（）替代runOnUiThread。

myTextView.post(new Runnable() {
    public void run() {
        messageFromSlowStuff = doSomeSlowStuff();
        myTextView.setText(messageFromSlowStuff);
    }
});

以下是有关View.post（）的文档："post reference"

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