来自广播接收者的通知

Question

我正在建造一个闹钟，在所需的时间后会显示通知。为此，我使用了alarmmanager和broadcastreceiver来显示通知。 我已经使用通知生成器来生成通知。我的问题是broadcastreceiver在给定的时间不显示通知。

MainActivty.java

import android.app.Activity; 
import android.app.AlarmManager; 
import android.app.PendingIntent; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class MainActivity extends Activity { 

    int i=0; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     Button button = (Button)findViewById(R.id.button1); 
     final EditText et = (EditText)findViewById(R.id.et); 
     button.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       String s = et.getText().toString(); 
       int time = Integer.parseInt(s); 
       setAlarm(time); 
      } 
     }); 
    } 

    public void setAlarm(int time){ 
     i++; 
     Intent intent = new Intent(this, MyBroadcastReceiver.class); 
     PendingIntent pendingIntent = PendingIntent.getBroadcast(
     this.getApplicationContext(), i, intent, 0); 
     AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); 
     alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() 
     + (time * 1000), pendingIntent); 
     Toast.makeText(this, "Alarm set in " + time + " seconds", 
     Toast.LENGTH_LONG).show(); 
    } 


} 

MyBroadcastReceiver.java

import android.app.NotificationManager; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.support.v4.app.NotificationCompat; 

public class MyBroadcastReceiver extends BroadcastReceiver { 
    @Override 
    public void onReceive(Context context, Intent intent) { 
     /**Toast.makeText(context, "Time is up!!!!.", 
     Toast.LENGTH_LONG).show(); 
     // Vibrate the mobile phone 
     Vibrator vibrator = (Vibrator) context 
     .getSystemService(Context.VIBRATOR_SERVICE); 
     vibrator.vibrate(2000); 
     **/ 
     NotificationCompat.Builder builder = new NotificationCompat.Builder(
       context) 
       // Set Icon 
       //.setSmallIcon(R.drawable.logosmall) 
       // Set Ticker Message 
       .setTicker("ticker") 
       // Set Title 
       .setContentTitle("new Notification") 
       // Set Text 
       .setContentText("new message") 
       // Add an Action Button below Notification 
       //.addAction(R.drawable.ic_launcher, "Action Button", pIntent) 
       // Set PendingIntent into Notification 
       //.setContentIntent(pIntent) 
       // Dismiss Notification 
       .setAutoCancel(true); 



     NotificationManager notificationmanager = (NotificationManager) context 
       .getSystemService(Context.NOTIFICATION_SERVICE); 
     // Build Notification with Notification Manager 
     notificationmanager.notify(0, builder.build()); 

    } 
} 

XML布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.alarm.MainActivity" > 


    <EditText 
     android:id="@+id/et" 
     android:layout_width="100dp" 
     android:layout_height="wrap_content"/> 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/timePicker1" 
     android:layout_below="@+id/timePicker1" 
     android:layout_marginLeft="89dp" 
     android:layout_marginTop="26dp" 
     android:text="Button" /> 

</RelativeLayout> 

Android清单

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

    <uses-permission android:name="android.permission.VIBRATE" /> 

    <uses-sdk 
     android:minSdkVersion="8" 
     android:targetSdkVersion="21" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name=".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="MyBroadcastReceiver" > 
     </receiver> 
    </application> 

</manifest> 

我希望问题是明确的:)

Answer 1

好吧，所以，我认为问题是，你需要设置小图标。没有它，通知将不会显示。