您只需要在清单活动标记中写一行

 android:windowSoftInputMode="stateAlwaysHidden|adjustPan"

它会起作用的。

这对我有用：

 @Override
 public boolean dispatchTouchEvent(MotionEvent event) {
View v = getCurrentFocus();
boolean ret = super.dispatchTouchEvent(event);

if (v instanceof EditText) {
    View w = getCurrentFocus();
    int scrcoords[] = new int[2];
    w.getLocationOnScreen(scrcoords);
    float x = event.getRawX() + w.getLeft() - scrcoords[0];
    float y = event.getRawY() + w.getTop() - scrcoords[1];

    Log.d("Activity",
            "Touch event " + event.getRawX() + "," + event.getRawY()
                    + " " + x + "," + y + " rect " + w.getLeft() + ","
                    + w.getTop() + "," + w.getRight() + ","
                    + w.getBottom() + " coords " + scrcoords[0] + ","
                    + scrcoords[1]);
    if (event.getAction() == MotionEvent.ACTION_UP
            && (x < w.getLeft() || x >= w.getRight() || y < w.getTop() || y > w
                    .getBottom())) {

        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(getWindow().getCurrentFocus()
                .getWindowToken(), 0);
    }
}
return ret;
}

以下是使用Kotlin隐藏软键盘的最简单方法：

//hides soft keyboard anything else is tapped( screen, menu bar, buttons, etc. )
override fun dispatchTouchEvent( ev: MotionEvent? ): Boolean {
    if ( currentFocus != null ) {
        val imm = getSystemService( Context.INPUT_METHOD_SERVICE ) as InputMethodManager
        imm.hideSoftInputFromWindow( currentFocus!!.windowToken, 0 )
    }
    return super.dispatchTouchEvent( ev )
}

首先，您应该从XML文件中添加addandroid:imeOptions字段，并将其值更改为actionUnspecified|actionGo，如下所示

 <android.support.design.widget.TextInputEditText
                    android:id="@+id/edit_text_id"
                    android:layout_width="fill_parent"
                    android:layout_height="@dimen/edit_text_height"
                    android:imeOptions="actionUnspecified|actionGo"
                    />

然后在java类中添加setOnEditorActionListener并添加InputMethodManager，如下所示

enterOrderNumber.setOnEditorActionListener（新的TextView.OnEditorActionlister（）{

    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        if (actionId == EditorInfo.IME_ACTION_GO) {
            InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Activity.INPUT_METHOD_SERVICE);
            imm.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
            return true;
        }
        return false;
    }
});

现在，将近12年后，我们终于有了一种官方的、向后兼容的方式来实现AndroidX Core 1.5+：

fun View.hideKeyboard() = ViewCompat.getWindowInsetsController(this)
    ?.hide(WindowInsetsCompat.Type.ime())

或特别针对片段：

fun Fragment.hideKeyboard() = ViewCompat.getWindowInsetsController(requireView())
    ?.hide(WindowInsetsCompat.Type.ime())

您可以简单地将此代码添加到要隐藏软键盘的位置“

                        // Check if no view has focus:
                            View view = getCurrentFocus();
                            if (view != null) {
                                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                                imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
                            }