错误：java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tongzhi

*NotificationManager的主要方法有

（1）notify(int id,Notification notification);

         notify(String tag,int id,Notification notification);

这两个方法主要用于在通知栏给出提示。

其中id是唯一标识；参数notification是一个通知对象Notification类，不能为null；参数tag是该通知字符串标示，可以为null

（2）cancel(int id);

         cancel(String tag,int id);

         cancekAll();

这3个方法用于取消显示的通知，其中id是通知的唯一标识；参数tag是通知的字符串标识；最后一种方法用于取消所有先前显示的通知

*Notification：通过构造该类，实现通知的具体内容

它常用的构造方法有：

    Notification();

    Notification(int icon,CharSequence tickerText,long when);//图标；显示的通知的文本；产生时间

例如：

 Notification notification=new Notification(R.drawable.ic_launcher,text,Sytem.currentTimeMillis());

 

1、获得通知栏管理器NotificationManager

 NotificationManager nm=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);

nm.notify(int id,Notification notification)//通知的唯一标识

2、通知Notification

PendingIntent contentIntent=PendingIntent.getActivity(this,0,new Intent(this,Activity2.class),0);

noticafication.setLatestEventInfo(context, contentTitle, contentText, contentIntent);//上下文；通知栏标题文字；内容文字；点击后的动作

notification.default I=Notification.DEFAULT_SOUND;//添加声音

notification.default I=Notification.DEFAULT_VIBRATE;添加震动

【我的实例：】



【代码：】

package com.example.tongzhi;

import android.os.Bundle;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.view.Menu;

public class MainActivity extends Activity {
private NotificationManager nm;

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

@SuppressWarnings("deprecation")
public void showNotification() {
CharSequence text = "wwy->我是内容！";
Notification notification = new Notification(R.drawable.ic_launcher,
text, System.currentTimeMillis());
PendingIntent pendIntent = PendingIntent.getActivity(MainActivity.this,
0, new Intent(), 0);
notification.setLatestEventInfo(MainActivity.this, "我是标题：", text,
pendIntent);
notification.defaults |=Notification.DEFAULT_SOUND;
notification.defaults |=Notification.DEFAULT_VIBRATE;
nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
nm.notify(R.string.hello_world, notification);

}

}

 

【调试错误：】

12-10 21:32:17.980: E/AndroidRuntime(21966): FATAL EXCEPTION: main

12-10 21:32:17.980: E/AndroidRuntime(21966): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tongzhi/com.example.tongzhi.MainActivity}: java.lang.IllegalArgumentException: contentView required: pkg=com.example.tongzhi id=2131034114
notification=Notification(pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x0 kind=[null])

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.
4000
app.ActivityThread.performLaunchActivity(ActivityThread.java:2306)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.ActivityThread.access$600(ActivityThread.java:156)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1340)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.os.Handler.dispatchMessage(Handler.java:99)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.os.Looper.loop(Looper.java:153)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.ActivityThread.main(ActivityThread.java:5299)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at java.lang.reflect.Method.invokeNative(Native Method)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at java.lang.reflect.Method.invoke(Method.java:511)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at dalvik.system.NativeStart.main(Native Method)

12-10 21:32:17.980: E/AndroidRuntime(21966): Caused by: java.lang.IllegalArgumentException: contentView required: pkg=com.example.tongzhi id=2131034114 notification=Notification(pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x0 kind=[null])

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.os.Parcel.readException(Parcel.java:1429)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.os.Parcel.readException(Parcel.java:1379)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.INotificationManager$Stub$Proxy.enqueueNotificationWithTag(INotificationManager.java:228)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.NotificationManager.notify(NotificationManager.java:132)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.NotificationManager.notify(NotificationManager.java:108)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at com.example.tongzhi.MainActivity.showNotification(MainActivity.java:23)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at com.example.tongzhi.MainActivity.onCreate(MainActivity.java:15)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.Activity.performCreate(Activity.java:5122)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)

12-10 21:32:17.980: E/AndroidRuntime(21966):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)

12-10 21:32:17.980: E/AndroidRuntime(21966):  ... 11 more

【错误原因：】

没有这一句：

notification.setLatestEventInfo(MainActivity.this, "我是标题：", text,pendIntent);

即为通知设置点击事件。