apk是否有，獲取apk包名，名字，版本，等一些常用信息

apk是否有，獲取apk包名，名字，版本，等一些常用信息

獲取手機所以apk的包名，名字，版本，等一些常用信息

List<PackageInfo> list = getPackageManager().getInstalledPackages(0);  
			for (int i = 0; i < list.size(); i++) {  
			    PackageInfo packageInfo = list.get(i);  
			   try {
				String apkName = packageInfo.applicationInfo.loadLabel(  
				            getPackageManager()).toString();  
				    String packageName = packageInfo.packageName;  
				    String versionName = packageInfo.versionName;  
				    String versionCode = packageInfo.versionCode+"";
				    i("apkNameLog", "="+i+"=="+apkName+"=="+packageName+"=="+versionName+"=="+versionCode);
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}  
			     
			} 

判斷該APK是否已經被安裝

private boolean isAvilible(Context context, String packageName) {
		if (packageName == null || "".equals(packageName))
			return false;// 沒有安裝
		try {
			PackageInfo packageInfo =
					 this.getPackageManager().getPackageInfo(packageName, 0);
			return true;// 已經安裝
		} catch (NameNotFoundException e) {
			return false;// 沒有安裝
		}

	}

打開APK程序代碼

private void openFile(File file) {
                 // TODO Auto-generated method stub
                 Log.e("OpenFile", file.getName());
                 Intent intent = new Intent();
                 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                 intent.setAction(android.content.Intent.ACTION_VIEW);
                 intent.setDataAndType(Uri.fromFile(file),
                                 "application/vnd.android.package-archive");
                 startActivity(intent);
         }