android 软件键盘的可见性

Question

我想检查一下软键盘是否可见。我读过这个topic。

final View activityRootView = findViewById(R.id.activityRoot);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        int heightDiff = activityRootView.getRootView().getHeight() - activityRootView.getHeight();
        if (heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...
            ... do something here
        }
     }
});

但 activityRootView.getRootView().getHeight() 和 activityRootView.getHeight() 总是 returns 相同的值，不关心键盘是否可见。任何想法为什么？因为这个解决方案似乎适用于其他人。

Answer 1

此代码可能会有所帮助 -

public void dismissKeyboard(){
    InputMethodManager imm =(InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(mSearchBox.getWindowToken(), 0);
    mKeyboardStatus = false;
}

public void showKeyboard(){
    InputMethodManager imm =(InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
    mKeyboardStatus = true;
}

private boolean isKeyboardActive(){
    return mKeyboardStatus;
}

mKeyboardStatus 的默认原始布尔值将被初始化为 false。

然后检查值如下，必要时执行操作：

mSearchBox.requestFocus();
if(!isKeyboardActive()){
    showKeyboard();
}else{
    dismissKeyboard();
}

编辑 -

最简单的找出方法-

contentView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
 public void onGlobalLayout() {

Rect r = new Rect();
contentView.getWindowVisibleDisplayFrame(r);
int screenHeight = contentView.getRootView().getHeight();

// r.bottom is the position above soft keypad or device button.
// if keypad is shown, the r.bottom is smaller than that before.
int keypadHeight = screenHeight - r.bottom;

Log.d(TAG, "keypadHeight = " + keypadHeight);

if (keypadHeight > screenHeight * 0.20) { // 0.20 ratio is perhaps enough to determine keypad height.
    // keyboard is opened
}
else {
    // keyboard is closed
}
}
});

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