自己的应用中调用android系统闹钟

/*

	综合网上的资料，自己整理了比较简单的调用系统闹钟的方法！

*/

package com.lsd.CallSystemClock;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class CallSystemClockActivity extends Activity {
	private final static int SET = 1;// 线程操作标记
    private Button callSystemClock;
    private List allPackageInfos; // 取得系统安装所有软件信息
	private List userPackageInfos;// 取得自己安装的软件信息
	private List sysPackageInfos;// 取得系统安装的软件信息
	
	private Handler mHandler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case SET:
				 Toast.makeText(CallSystemClockActivity.this, "程序加载完成", Toast.LENGTH_SHORT).show();
				break;
			}
		}
	};
	
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        new Thread(new SeachThread()).start();// 启动线程加载安装程序
        
        callSystemClock = (Button) super.findViewById(R.id.callSystemClock);
        callSystemClock.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				call();//跳转
				
			}
		});
    }
    
    
    
    private void call(){
    	String activityName = "";//activity名
		String packageName = "";// 得到程序包名
		String clockPackageName = "";// 闹钟包名
		for (int i = 0; i < sysPackageInfos.size(); i++) {
			PackageInfo packageInfo = sysPackageInfos.get(i);// 循环取出系统程序
			packageName = packageInfo.packageName;
			if (packageName.indexOf("clock") != -1) {
				if (!(packageName.indexOf("widget") != -1)) {
					// 找到系统闹钟了
					ActivityInfo activityInfo = packageInfo.activities[0];// 取出activity信息
					activityName = activityInfo.name;// 取出activity名字
					clockPackageName = packageName;
				}
			}
		}
		if((activityName != "") && (clockPackageName != "")){
			Intent intent = new Intent();
			intent.setComponent(new ComponentName(clockPackageName, activityName));
			startActivity(intent);
		}else{
			Toast.makeText(this, "启动闹钟失败！", Toast.LENGTH_SHORT).show();
		}
    }
    
    
 // ***************--------*异步线程加载加载安装程序*--------------*******************//
 	private class SeachThread extends Thread {
 		@Override
 		public void run() {
 			allPackageInfos = getPackageManager().getInstalledPackages(
 					PackageManager.GET_UNINSTALLED_PACKAGES | PackageManager.GET_ACTIVITIES); // 取得系统安装所有软件信息
 			userPackageInfos = new ArrayList();// 定义用户安装软件信息包
 			sysPackageInfos = new ArrayList();// 定义系统安装软件信息包

 			for (int i = 0; i < allPackageInfos.size(); i++) {// 循环取出所有软件信息
 				PackageInfo temp = allPackageInfos.get(i);
 				ApplicationInfo appInfo = temp.applicationInfo;// 得到每个软件信息
 				if ((appInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0
 						|| (appInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
 					sysPackageInfos.add(temp);// 系统软件
 				} else {
 					userPackageInfos.add(temp);// 是用户自己安装软件
 				}
 			}
 			Message msg = new Message();// 查询完成，发送新消息
 			msg.what = SET;// 操作标记
 			mHandler.sendMessage(msg);
 		}
 	};
}

源码