Android:Notification的生成与取消

时间：2023-03-08 19:15:39

　　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:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/container"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example.notificationdemo.MainActivity"

    tools:ignore="MergeRootFrame" >

    <Button

        android:id="@+id/btn_cancel"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentRight="true"

        android:text="取消通知" />

	<Button

	    android:id="@+id/btn_generate"

	    android:layout_width="wrap_content"

	    android:layout_height="wrap_content"

	    android:layout_alignParentLeft="true"

	    android:layout_alignParentRight="true"

	    android:text="生成通知"

	    android:layout_below="@+id/btn_cancel" />

</RelativeLayout>

　　second_act.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/container"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example.notificationdemo.MainActivity"

    tools:ignore="MergeRootFrame" >

	<TextView

	    android:id="@+id/tv01"

	    android:text="我是第二页"

	    android:layout_width="wrap_content"

	    android:layout_height="wrap_content"

	    />

</RelativeLayout>

　　清單文件：

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.notificationdemo"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="16"

        android:targetSdkVersion="19" />

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

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

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.notificationdemo.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>

        <activity

            android:name="com.example.notificationdemo.SecondActivity"

            android:label="@string/app_name" >

        </activity>

    </application>

</manifest>

　　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。

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