java自己用到的工具类

public class Utils {
public static final String TAG = "Utils";

public static void installApk(Activity activity, String filename) {
File file = new File(filename);
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(Intent.ACTION_VIEW);
String type = "application/vnd.android.package-archive";
intent.setDataAndType(Uri.fromFile(file), type);
activity.startActivity(intent);
}

public static String getVersionName(Context context, String packageName) throws Exception {
PackageManager packageManager = context.getPackageManager();
PackageInfo packInfo = packageManager.getPackageInfo(packageName, 0);
return packInfo.versionName;
}

public static int getVersionCode(Context context, String packageName) throws Exception {
PackageManager packageManager = context.getPackageManager();
PackageInfo packInfo = packageManager.getPackageInfo(packageName, 0);
return packInfo.versionCode;
}

public static void showToast(Context context,String text){
Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
}
}