有时候我们需要实现一个功能。不过这个功能用我们传统的Java代码实现起来会有一些困难，这时我们可以尝试利用Shell命令来实现。你可以按照下面的代码模块来进行你想要实现的Shell命令(注：也不是所有的Shell命令都能用Java代码来实现)。

public class MainActivity extends Activity {

private final String TAG = "---MainActivity---";

public final String SHELL_0 = "busybox ps";

public final String SHELL_1 = "su";

public final String SHELL_2 = "cd mnt/shell/emulated/0/.ZFSafeFS";

public final String SHELL_3 = "busybox mount .a1.img ./.abc";

public final String SHELL_4 = "busybox umount ./.abc";

public final String EXECUTE_SHELL = SHELL_0;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button sendButton = (Button) findViewById(R.id.send_btn);

Button suButton = (Button) findViewById(R.id.su_button);

Button cdButton = (Button) findViewById(R.id.alert_path_button);

Button mountButton = (Button) findViewById(R.id.mount_button);

Button umountButton = (Button) findViewById(R.id.umount_button);

suButton.setText(SHELL_1);

cdButton.setText(SHELL_2);

mountButton.setText(SHELL_3);

umountButton.setText(SHELL_4);

sendButton.setOnClickListener(viewOnClickListener);

suButton.setOnClickListener(viewOnClickListener);

cdButton.setOnClickListener(viewOnClickListener);

mountButton.setOnClickListener(viewOnClickListener);

umountButton.setOnClickListener(viewOnClickListener);

handleShell(EXECUTE_SHELL);

}

private void handleShell(String shell) {

TextView textView = (TextView) findViewById(R.id.textview);

Process p = null;

try {

p = Runtime.getRuntime().exec(shell);

if (p == null) {

textView.setText("p == null");

} else {

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(p.getInputStream()));

int read = 0;

char[] buffer = new char[4096];

StringBuffer output = new StringBuffer();

Log.i(TAG, "read = " + read);

Log.i(TAG, "output = " + output);

while((read = bufferedReader.read(buffer)) > 0) {

output.append(buffer, 0, read);

}

bufferedReader.close();

String string = String.copyValueOf(buffer);

Log.i(TAG, "string = " + string);

textView.setText("result:\n" + string);

}

} catch (IOException e) {

textView.setText("e=" + e);

e.printStackTrace();

}

}

private OnClickListener viewOnClickListener = new OnClickListener() {

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.su_button:

handleShell(SHELL_1);

break;

case R.id.alert_path_button:

handleShell(SHELL_2);

break;

case R.id.mount_button:

handleShell(SHELL_3);

break;

case R.id.umount_button:

handleShell(SHELL_4);

break;

default:

break;

}

}

};

}