MainActivity.java:
package com.example.notificationdemo;import android.app.Activity;import android.app.ActionBar;import android.app.Fragment;import android.app.Notification;import android.app.Notification.Builder;import android.app.NotificationManager;import android.app.PendingIntent;import android.content.Intent;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.Toast;import android.os.Build;public class MainActivity extends Activity { Button btn_cancel; Button btn_generate; Notification notification; PendingIntent pintent; Intent intent; NotificationManager manager;// 后面要用 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn_cancel = (Button) findViewById(R.id.btn_cancel); btn_generate = (Button) findViewById(R.id.btn_generate); btn_generate.setOnClickListener(new MyListener()); btn_cancel.setOnClickListener(new MyListener()); } public class MyListener implements OnClickListener { @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_generate: System.out.println("=========btn_generate====="); GenerateNotification(); break; case R.id.btn_cancel: System.out.println("=========btn_cancel====="); CancelNotification(); break; } } } private void GenerateNotification() { intent = new Intent(this, SecondActivity.class); pintent = PendingIntent.getActivity(this, 0, intent, 0); Builder builder = new Builder(this); builder.setSmallIcon(R.drawable.ic_launcher); builder.setTicker("这是手记状态栏提示"); builder.setWhen(System.currentTimeMillis()); builder.setContentTitle("woshi biaoti"); builder.setContentText("标题内容我是"); builder.setContentIntent(pintent); builder.setDefaults(Notification.DEFAULT_SOUND); builder.setDefaults(Notification.DEFAULT_LIGHTS); // builder.getNotification();//4.0以及以下版本用这个获取notification Notification notification = builder.build();// 4.1以及以上版本用这个 Toast.makeText(this, "生成通知", 50).show(); manager = (NotificationManager) this .getSystemService(NOTIFICATION_SERVICE); manager.notify(23, notification);// 发出通知 } private void CancelNotification() { // if(manager.equals("")||manager==null){//不能这么判断，因为加入manager为空，那么null.equals("")肯定就会空指针异常 if (manager == null) { Toast.makeText(this, "亲，暂时没有消息，所以无法取消", 50).show(); return; } else { Toast.makeText(this, "取消", 50).show(); manager.cancel(23); } }}
SecondActivity.java
package com.example.notificationdemo;import android.app.Activity;import android.os.Bundle;public class SecondActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.second_act); }} activity_main.xml:
second_act.xml:
清單文件：
效果圖：
遇到一个奇怪的事情：
如下：
package com.example.notificationdemo;import android.app.Activity;import android.app.Notification;import android.app.Notification.Builder;import android.app.NotificationManager;import android.app.PendingIntent;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class SecondActivity extends Activity implements OnClickListener { Button btn; PendingIntent pintent; Intent intent; NotificationManager manager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.second_act); System.out.println("second:" + Thread.currentThread().getName()); Toast.makeText(this, "second:" + Thread.currentThread().getName(), 21) .show(); btn = (Button) findViewById(R.id.sec_generate); Toast.makeText(this, "this is the second,begin to go back", 12).show(); btn.setOnClickListener(this); System.out.println("第二页的，btn is onclicked"); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.sec_generate: intent = new Intent(this,MainActivity.class); pintent = PendingIntent.getActivity(this, 0, intent, 0);//跳回第一页用 Builder builder = new Builder(this); builder.setContentText("京东啊啊啊"); builder.setContentTitle("GO BACK"); builder.setSmallIcon(R.drawable.ic_launcher);//不设置SmallICon就没法跳转// Notification notification = builder.build(); builder.setTicker("我是ticker"); builder.setContentIntent(pintent); builder.setDefaults(Notification.DEFAULT_SOUND); builder.setDefaults(Notification.DEFAULT_LIGHTS); Notification notification = builder.build();//一定要放在setContentIntent()后 manager = (NotificationManager) this.getSystemService(NOTIFICATION_SERVICE); Toast.makeText(this, "back to the mainactivity", 12).show(); manager.notify(1, notification); System.out.println("=============se==========="); break; } }} 其中的builder.setSmallIcon(R.drawable.ic_launcher);如果注释掉，那么就不会生成相应的通知消息。暂时没找到原因，不知道为什么。