从发起活动的活动发送消息到点击通知时启动的消息

Question

我想从正在启动通知的活动向用户单击通知时启动的活动发送消息。

我只想要一个EditText价值从一个活动发送到另一个，当我点击按钮通过通知。 我试图在意图中使用putExtra，但随后它显示NullPointer异常。

走到这个环节

How to send parameters from a notification-click to an activity?

我用onNewIntent但我仍然没有得到输出

package com.pdd.notification; 

import android.app.Activity; 
import android.app.Notification; 
import android.app.NotificationManager; 
import android.app.PendingIntent; 
import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 

public class NotificationDemoActivity 
extends Activity implements OnClickListener 
{ 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    Button b=(Button) findViewById(R.id.button1); 
    b.setOnClickListener(this); 
} 

public void onClick(View v) { 

    EditText et=(EditText) findViewById(R.id.editText1); 
    String ns = Context.NOTIFICATION_SERVICE; 
NotificationManager mNotificationManager = 
         (NotificationManager)getSystemService(ns); 

    int icon = android.R.drawable.ic_dialog_alert; 
    CharSequence tickerText = "Hello"; 
    long when = System.currentTimeMillis(); 

    Notification notification = new Notification(icon, tickerText, when); 


    Context context = getApplicationContext(); 
    CharSequence contentTitle = "My notification"; 
    CharSequence contentText = "Hello World!"; 
    Intent notificationIntent = new Intent(this, Second.class); 
    notificationIntent.putExtra("im",et.getText().toString()); 
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0,  
    notificationIntent, 0); 


    notification.setLatestEventInfo(context, contentTitle, contentText, 
    contentIntent); 

    final int HELLO_ID = 1; 

    mNotificationManager.notify(HELLO_ID, notification); 

} 
} 

---

package com.pdd.notification; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.EditText; 


public class Second extends Activity { 


@Override 
protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 

    setContentView(R.layout.second); 

    /*Intent i=getIntent(); 
    if(i==null) 
     return; 

    Bundle b=i.getExtras(); 

    String s=b.getString("im"); //incoming message 

    EditText et=(EditText) findViewById(R.id.editText1); 

    et.setText(s); 


    */ 
} 

@Override 
protected void onNewIntent(Intent intent) { 

    //Intent i=getIntent(); 

    if(intent!=null) 
    { 


    Bundle b=intent.getExtras(); 

    String s=b.getString("im"); //incoming message 

    EditText et=(EditText) findViewById(R.id.editText2); 

    et.setText(s); 
    Log.d("p",s); 
    } 
    super.onNewIntent(intent); 
} 
} 

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

<uses-sdk android:minSdkVersion="8" /> 

<application 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" > 
    <activity 
     android:name=".NotificationDemoActivity" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

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


    <activity android:name=".Second" android:launchMode="singleTop"></activity> 
    </application> 

</manifest> 

Answer 1

我得到了解决办法，可以去后API演示 做了以下更改

notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, 
notificationIntent,PendingIntent.FLAG_UPDATE_CURRENT);