Suppress keyboard from popping up

Question

I want to stop keyboard from popping up in my android app. I wish to add this code

public void hideSoftKeyboard() {
    if (getCurrentFocus() != null) {
        InputMethodManager inputMethodManager = (InputMethodManager) 
        getSystemService(INPUT_METHOD_SERVICE);

        inputMethodManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 
        0);
    }
}

but I am not sure where to insert in my MainActivity.java file

public class MainActivity extends AppCompatActivity {
    Button button;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button) findViewById(R.id.MyButton);

        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {

                Intent myIntent = new Intent(MainActivity.this,
                        Main2Activity.class);
                startActivity(myIntent);
            }
        });
    }
}

Answer 1

为了避免键盘弹出，将其添加到onCreate()方法中：

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);

Answer 2

If you want to dismiss the keyboard when users open MainActivity , you should use this code in onStart method.

@Override
protected void onStart() {
    super.onStart();
    getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN)
}

For some cases to prevent keyboard from popping up when the MainActivity goes from background to foreground, then you should use your method in onStop method.

@Override
protected void onStop() {
    super.onStop();
    hideSoftKeyboard();
}

Answer 3

If you don't want the keyboard to show when your activity gets focus then you can add attributes in the manifest:

<activity android:windowSoftInputMode="stateAlwaysHidden" . . . >

This manipulates how the main window of the activity interacts with the window containing the on-screen soft keyboard. The setting for this attribute affects the state of the soft keyboard — whether it is hidden or visible — when the activity becomes the focus of user attention. You can use one of the following attribute depending on your requirement :

1. " stateHidden " The soft keyboard is hidden when the user chooses the activity — that is, when the user affirmatively navigates forward to the activity, rather than backs into it because of leaving another activity.
2. " stateAlwaysHidden " The soft keyboard is always hidden when the activity's main window has input focus.

If you want to do it programatically then you can use your method in onCreate