从c2dm中的非活动开始活动没有显示

问题描述：

我试图显示来自C2DM的消息，所以当我从非活动开始活动时，它只能第一次运行。我的活动包含查看和关闭按钮，所以如果用户不在应用程序内，当他收到推送通知时，它应该启动应用程序，当他按下查看按钮或在关闭时关闭它也适用，但当用户按查看按钮并进入该应用程序比我无法再次启动该活动后，似乎活动在那里，但它对用户不可见。我的代码如下，希望你明白我在说什么。所使用的代码C2DM例如从here 从c2dm中的非活动开始活动没有显示

C2DMReceiver

package com.mks.android.example; 

import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 

import com.google.android.c2dm.C2DMBaseReceiver; 
import com.google.android.c2dm.C2DMessaging; 
import com.mks.android.example.activity.MessageDialogActivity; 

public class C2DMReceiver extends C2DMBaseReceiver { 
    private static String senderId = "[email protected]"; 
    String registrationId; 
    public C2DMReceiver() { 
     super(senderId); 
    } 

    @Override 
    public void onRegistrered(Context context, String registrationId) { 
     this.registrationId = registrationId; 
     Log.e("Error", registrationId); 
    } 

    @Override 
    public void onUnregistered(Context context) { 
     C2DMessaging.register(context, senderId); 
    } 

    @Override 
    public void onError(Context context, String errorId) { 
     Log.w("Error", errorId); 
    } 

    @Override 
    protected void onMessage(Context context, Intent intent) { 
     Log.i("Error", "MessageReceived"); 
     Bundle bundle = intent.getExtras(); 
     intent = new Intent(); 
     intent.putExtra("messageBundle", bundle); 
     intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);  
     intent.setClass(context, MessageDialogActivity.class); 
     startActivity(intent);  
     // load message display activity here  
    } 
}

消息对话框活动类

package com.mks.android.example.activity; 

import android.app.Activity; 
import android.content.ComponentName; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.TextView; 

import com.mks.android.example.R; 
import com.mks.android.example.activity.list.Functions; 

public class MessageDialogActivity extends Activity { 
    private Functions func = new Functions(); 
    private int isAppActive = 0; 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     showMessages(); 
    } 
    private void showMessages(){ 
     Bundle bundle = getIntent().getBundleExtra("messageBundle"); 
     String title = bundle.getString("title"); 
     String message = bundle.getString("message"); 
     setContentView(R.layout.c2dm_message); 

     TextView txtTitle = (TextView) findViewById(R.id.title); 
     TextView txtMessage = (TextView) findViewById(R.id.message); 
     Button btnView = (Button) findViewById(R.id.btnView); 
     Button btnClose = (Button) findViewById(R.id.btnClose); 
     txtTitle.setText(title); 
     txtMessage.setText(message); 

     this.isAppActive = func.getAppState(this); 

     if(isAppActive==1){ 
      btnView.setVisibility(View.GONE); 
     }  

     btnView.setOnClickListener(new OnClickListener() {   
      @Override 
      public void onClick(View v) { 
       if(isAppActive == 0){ 
        Intent intent = new Intent(Intent.ACTION_MAIN); 
        intent.setComponent(new ComponentName("com.mks.android.example","com.mks.android.example.activity.MainActivity")); 
        startActivity(intent);     
       } 
       MessageDialogActivity.this.finish(); 
      } 
     }); 

     btnClose.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       finish();    
      } 
     }); 
    } 
    @Override 
     protected void onNewIntent(Intent intent) { 
      setIntent(intent); 
      showMessages(); 
     } 
}

AndroidManifest文件中取出

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.mks.android.example" 
     android:versionCode="1" 
     android:versionName="1.0" android:installLocation="preferExternal"> 
    <uses-sdk android:minSdkVersion="4" /> 
    <application android:label="@string/app_name" android:icon="@drawable/icon_launcher" android:debuggable="true"> 
     <uses-library android:name="com.google.android.maps" /> 
     <activity android:name=".activity.MainActivity" 
        android:label="@string/app_name" 
        android:screenOrientation="portrait" 
        android:theme="@android:style/Theme.NoTitleBar" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

     <activity android:name=".activity.MessageDialogActivity" android:theme="@style/DialogNoTitle" android:activity android:launchMode="singleTop" /> 

     <service android:name=".C2DMReceiver" />   
     <!-- Only C2DM servers can send messages for the app. If permission is not set - any other app can generate it --> 
     <receiver android:name="com.google.android.c2dm.C2DMBroadcastReceiver" android:permission="com.google.android.c2dm.permission.SEND"> 
      <!-- Receive the actual message --> 
      <intent-filter> 
       <action android:name="com.google.android.c2dm.intent.RECEIVE" /> 
       <category android:name="com.mks.android.example" /> 
      </intent-filter> 
      <!-- Receive the registration id --> 
      <intent-filter> 
       <action android:name="com.google.android.c2dm.intent.REGISTRATION" /> 
       <category android:name="com.mks.android.example" /> 
      </intent-filter> 
     </receiver> 
    </application> 
    <supports-screens android:smallScreens="true" 
     android:normalScreens="true" 
     android:largeScreens="true" 
     android:anyDensity="true" /> 
<permission android:name="com.mks.android.example.permission.C2D_MESSAGE" android:protectionLevel="signature" /> 
<uses-permission android:name="com.mks.android.example.permission.C2D_MESSAGE" /> 
<!-- This app has permission to register and receive message --> 
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.WAKE_LOCK" /> 
<uses-permission android:name="android.permission.INTERNET" /> 
</manifest>

如果我删除androidLaunchMode singleTop表单清单文件，并将设置标志添加到C2DMReciver类中的multipleTask，它的工作原理，但我为每条消息获得大量的对话框。感谢帮助。

答

设置标志singletop，代码调用messagedialogactivity是下：

Intent intent = new Intent(); 
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TOP);  
intent.setClass(context, MessageDialogActivity.class);

从c2dm中的非活动开始活动没有显示

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