在Activity的onResume()部分，你可以调用方法bringKeyboard();

 onResume() {
     EditText yourEditText= (EditText) findViewById(R.id.yourEditText);
     bringKeyboard(yourEditText);
 }


  protected boolean bringKeyboard(EditText view) {
    if (view == null) {
        return false;
    }
    try {
      // Depending if edittext has some pre-filled values you can decide whether to bring up soft keyboard or not
        String value = view.getText().toString();
        if (value == null) {
            InputMethodManager imm = (InputMethodManager)context.getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
            return true;
        }
    } catch (Exception e) {
        Log.e(TAG, "decideFocus. Exception", e);
    }
    return false;
  }

editText.post(new Runnable() {
    @Override
    public void run() {
        InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(editText, InputMethodManager.SHOW_IMPLICIT);
    }
});

代码片段……

public void hideKeyboard(Context activityContext){

    InputMethodManager imm = (InputMethodManager)
            activityContext.getSystemService(Context.INPUT_METHOD_SERVICE);

    //android.R.id.content ( http://stackoverflow.com/a/12887919/2077479 )
    View rootView = ((Activity) activityContext)
            .findViewById(android.R.id.content).getRootView();

    imm.hideSoftInputFromWindow(rootView.getWindowToken(), 0);
}

public void showKeyboard(Context activityContext, final EditText editText){

    final InputMethodManager imm = (InputMethodManager)
            activityContext.getSystemService(Context.INPUT_METHOD_SERVICE);

    if (!editText.hasFocus()) {
        editText.requestFocus();
    }

    editText.post(new Runnable() {
        @Override
        public void run() {
            imm.showSoftInput(editText, InputMethodManager.SHOW_FORCED);
        }
    });
}

有时劳科德鲁格的答案并不管用。我是这样做的，经过了一些尝试和错误:

public static void showKeyboard(Activity activity) {
    if (activity != null) {
        activity.getWindow()
                .setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
    }
}

public static void hideKeyboard(Activity activity) {
    if (activity != null) {
        activity.getWindow()
                .setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
    }
}

EditText部分:

    editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if (!hasFocus) {
                hideKeyboard(getActivity());
            } else {
                showKeyboard(getActivity());
            }
        }
    });

要强制显示软键盘，可以使用

EditText yourEditText= (EditText) findViewById(R.id.yourEditText);
yourEditText.requestFocus();
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(yourEditText, InputMethodManager.SHOW_IMPLICIT);

为了移除EditText上的焦点，你需要一个虚拟视图来抓取焦点。

关闭它，你可以使用

InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(yourEditText.getWindowToken(), 0);

这适用于在对话框中使用它

public void showKeyboard(){
    InputMethodManager inputMethodManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
    inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
}

public void closeKeyboard(){
    InputMethodManager inputMethodManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
    inputMethodManager.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
}

上面给出的所有解决方案(OnFocusChangeListener中的InputMethodManager交互)。onFocusChange监听器附加到您的EditText工作良好，如果您在活动中有单个编辑。

在我的例子中，我有两个编辑。

 private EditText tvX, tvY;
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
 tvX.setOnFocusChangeListener(this);
    tvY.setOnFocusChangeListener(this);

@Override
public void onFocusChange(View v, boolean hasFocus) {       
    InputMethodManager imm =  (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    if(tvX.hasFocus() || tvY.hasFocus()) {            
        imm.showSoftInput(v, 0);            
    } else {
        imm.hideSoftInputFromWindow(v.getWindowToken(), 0);         
    }       
};

我观察到onFocusChange被触发为tvX与hasFocus=true(键盘显示)，但随后为tvY与hasFocus=true(键盘隐藏)。最后，看不到键盘了。

一般解决方案应该有正确的语句在if“显示键盘，如果EditText文本有焦点”