開發APP有時候會遇到想直接用shell指令的方式來執行想要的程式，而不想為了一個功能寫了一堆Java code
透過程式執行shell指令有兩中方式，一種是只要執行，不管執行結果的回覆內容比較簡單，如下：

try {
    Runtime.getRuntime().exec("you shell command");
} catch (Exception e) {
    Log.e("Error: ", e.getMessage());
}

另外一種就是想知道下完指令的回傳結果

private static void runShellCommand(String command) {
	Process process = null;
	BufferedReader bufferedReader = null;
	StringBuilder mShellCommandSB =new StringBuilder();
	Log.d(TAG, "runShellCommand :" + command);
	mShellCommandSB.delete(0, mShellCommandSB.length());
	String[] cmd = new String[] { "/system/bin/sh", "-c", command };
	try {
		byte b[] = new byte[1024];
		process = Runtime.getRuntime().exec(cmd);
		bufferedReader = new BufferedReader(new InputStreamReader(
				process.getInputStream()));
		String line;
	
		while ((line = bufferedReader.readLine()) != null) {
			mShellCommandSB.append(line);
		}
		Log.d(TAG, "runShellCommand result : " + mShellCommandSB.toString());
		process.waitFor();
	} catch (IOException e) {
		e.printStackTrace();
	} catch (InterruptedException e) {
		e.printStackTrace();
	} finally {
		if (bufferedReader != null) {
			try {
				bufferedReader.close();
			} catch (IOException e) {
				// TODO: handle exception
			}
		}
	
		if (process != null) {
			process.destroy();
		}
	}
}