Notification.java

package com.example.notification;

import org.apache.http.client.utils.URIUtils;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.DialogInterface;
import android.view.ViewDebug.FlagToString;
import android.widget.Button;

public class MainActivity extends Activity {
    private Button button;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        button = (Button) findViewById(R.id.button1);
        button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                newNotification();
            }
        });
    }
    
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        super.onKeyDown(keyCode, event);
        if (event.getAction() == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_BACK) {
            // 点击了返回键, 阻止界面退出, 并创建对话框
            newDialog();
            Log.d("onKeyUp", "新建对话框");
            return false;
        }
        return true;
    }
    
    private Dialog newDialog () {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setIcon(R.drawable.ic_launcher);
        builder.setTitle("确定关机?");
        builder.setMessage("Message....");
        builder.setPositiveButton("确定", dialogListener);
        builder.setNegativeButton("取消", dialogListener);
        builder.create();
        return builder.show();
    }
    
    // 对话框按钮的监听器
    private DialogInterface.OnClickListener dialogListener = new DialogInterface.OnClickListener() {
        
        @Override
        public void onClick(DialogInterface arg0, int arg1) {
            if (arg1 == -1) {
                // 点击了确定键, NegativeButton
                newNotification();
                finish();
                Log.d("dialogListener", "新建通知");
            }
        }
    };
    
    private Notification newNotification () {
        Notification.Builder builder = new Notification.Builder(MainActivity.this);
        // 创建位图
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
        builder.setSmallIcon(R.drawable.ic_launcher);
        builder.setLargeIcon(bitmap);
        builder.setTicker("状态栏文本");
        builder.setContentTitle("通知的标题");
        builder.setContentText("通知的信息");
        builder.setWhen(System.currentTimeMillis());
        builder.setAutoCancel(true);
        
        Intent intent = new Intent(MainActivity.this, MainActivity.class);
        PendingIntent pendingItent = PendingIntent.getActivity(MainActivity.this, Intent.FLAG_ACTIVITY_NEW_TASK, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(pendingItent);
        
        // 获取系统的通知管理器
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = builder.build();
        manager.notify(1, notification);
        return notification;
        
    }
    

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}