android 获得安装apk包的版本信息 和 版本升级 代码

// 获得 下载后的 apk 版本信息

1.public class test4 extends Activity {    
2.        
3.    @Override    
4.    public void onCreate(Bundle savedInstanceState) {    
5.        super.onCreate(savedInstanceState);           
6.        setContentView(R.layout.main);        
7.        String archiveFilePath="sdcard/download/Law.apk";//安装包路径    
8.        PackageManager pm = getPackageManager();      
9.        PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);      
10.        if(info != null){      
11.            ApplicationInfo appInfo = info.applicationInfo;      
12.            String appName = pm.getApplicationLabel(appInfo).toString();      
13.            String packageName = appInfo.packageName;  //得到安装包名称    
14.            String version=info.versionName;       //得到版本信息         
15.            Toast.makeText(test4.this, "packageName:"+packageName+";version:"+version, Toast.LENGTH_LONG).show();    
16.            Drawable icon = pm.getApplicationIcon(appInfo);//得到图标信息    
17.            TextView tv = (TextView)findViewById(R.id.tv); //显示图标    
18.            tv.setBackgroundDrawable(icon);    
19.        }      
20.    }    
21.    
22.} 

//发送自身的版本信息，来决定是否升级

/**
	 * 检查是否需要升级
	 * 
	 * 
	 */
	public void updateSys(){
		/*
		 * <manifest xmlns:android="http://schemas.android.com/apk/res/android"
			package="com.tangkou.mm.nn.ui" android:versionCode="1"
			android:versionName="1.0">
		 * 
		 */
		String pName = "com.tangkou.mm.nn.ui";//mannifest中package内容
		String versionName = null;
        try {
			PackageInfo pinfo = getPackageManager().getPackageInfo(pName, PackageManager.GET_CONFIGURATIONS);
			versionName = pinfo.versionName;
		} catch (NameNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		MGRControlCenter mcc = MGRControlCenter.getInstance();
		mcc.update(versionName, new CallbackUI() {
			
			@Override
			public void execute(int errorCode, Object obj) {
				// TODO Auto-generated method stub
				VersionInfo versionInfo = (VersionInfo)obj;
				String url = versionInfo.URL;
				int  code = Integer.valueOf(versionInfo.needUpdate);
				switch (code) {
					case 0 : //不需要升级
						break;
					case 1 : // 需要升级后才能使用
						showUpdateDialog(1, url);
						break;
					case 2 : //需要升级，不升级也可以使用
						showUpdateDialog(2, url);
						break;
				}
			}
		});
	}
	/**
	 * 版本升级对话框
	 
	 * 
	 */
	public void showUpdateDialog(int i, final String url){
		if( i == 2){
			Dialog dialog = new AlertDialog.Builder(this)
			.setTitle(R.string.sysUpdate_title).setMessage(R.string.sysUpdate_message)// 设置内容
			.setPositiveButton(R.string.sysUpdate_pButton,// 设置确定按钮
					new DialogInterface.OnClickListener() {
				
				@Override
				public void onClick(DialogInterface dialog,
						int which) {
					pBar = new ProgressDialog(UIMainMenuActivity.this);
					pBar.setTitle(R.string.sysUpdate_pBar_title);
					Resources resources = getBaseContext().getResources();
					String message = resources.getString(R.string.sysUpdate_pBar_message);
					pBar.setMessage(message);
					pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
					downFile(url);
					
				}
				
			}).setNegativeButton(R.string.sysUpdate_nButton,
					new DialogInterface.OnClickListener() {
				public void onClick(DialogInterface dialog,
						int whichButton) {
					// 点击”取消”按钮之后退出程序
					
				}
			}).create();// 创建
			// 显示对话框
			dialog.show();
		}else if(i == 1){
			Dialog dialog = new AlertDialog.Builder(this)
			.setTitle(R.string.sysUpdate_title).setMessage(R.string.sysUpdate_message)// 设置内容
			.setPositiveButton(R.string.sysUpdate_pButton,// 设置确定按钮
					new DialogInterface.OnClickListener() {
				
				@Override
				public void onClick(DialogInterface dialog,
						int which) {
					pBar = new ProgressDialog(UIMainMenuActivity.this);
					pBar.setTitle(R.string.sysUpdate_pBar_title);
					pBar.setMessage(""+R.string.sysUpdate_pBar_message);
					pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
					downFile(url);
					
				}
				
			}).create();// 创建
			// 显示对话框
			dialog.show();
		}

	}
	/**
	 * 下载安装文件
	 * 
	 * @param url
	 */
	public void downFile(final String url) {
		appName = url.substring(url.lastIndexOf("/"), url.length());
		sdPath = Environment.getExternalStorageDirectory();
		pBar.show();
		new Thread() {
			public void run() {
				HttpClient client = new DefaultHttpClient();
				// params[0]代表连接的url
				HttpGet get = new HttpGet(url);
				HttpResponse response;
				try {
					response = client.execute(get);
					HttpEntity entity = response.getEntity();
					long length = entity.getContentLength();
					InputStream is = entity.getContent();
					FileOutputStream fileOutputStream = null;
					if (is != null) {
		
						File file = new File(sdPath, appName);
						fileOutputStream = new FileOutputStream(file);
		
						byte[] buf = new byte[1024];
						int ch = -1;
						int count = 0;
						while ((ch = is.read(buf)) != -1) {
							// baos.write(buf, 0, ch);
							fileOutputStream.write(buf, 0, ch);
							count += ch;
							if (length > 0) {
		
							}
		
						}
		
					}
					fileOutputStream.flush();
					if (fileOutputStream != null) {
						fileOutputStream.close();
					}
					down();
				} catch (ClientProtocolException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		
		}.start();
		
		}
	/**
	 * 下载完后取消progressBar效果
	 * @

	 */
	public void down() {
		handler.post(new Runnable() {
			public void run() {
				pBar.cancel();
				update();
			}
		});
		
	}
	/**
	 * 启动系统更新
	 * 	
	 */
	public void update() {
		
		Intent intent = new Intent(Intent.ACTION_VIEW);
		intent.setDataAndType(Uri.fromFile(new File(sdPath.getPath()+"/"+appName)),
				"application/vnd.android.package-archive");
		startActivity(intent);
	}