Android键盘调整调整大小

Question

我正在开发一个包含Activity和Fragment的应用程序。在片段布局中，我使用相对布局作为父布局，在滚动视图的底部和中间有一个按钮。Scrollview包含editText Boxes。如果我在滚动视图中单击最后一个editTextBox，我的键盘隐藏了fragment。我在清单中尝试了adjustpan|adjustresize，也在我的fragment中，但尚未解决问题。

Answer 1

在AndroidMenifest

android:windowSoftInputMode="stateAlwaysHidden|adjustResize

在编辑文本中使用

android:inputType="textMultiLine|textPostalAddress"
android:scrollbars="vertical"

Answer 2

这里面有Android的bug。经过一番努力，我能够想出一个顺利的解决这个问题的办法。这是一个单行解决方案，但它有一些先决条件。其中一行是:

AndroidBug5497Workaround.assistActivity(this, R.id.LayoutInScrollView);

你的xml布局必须像:

RelativeLayout{
 HeaderView{}
 ScrollView{
  LinearLayout{ 
    @+id/LayoutInScrollView
  }
 }
 FooterView{}      // the buttons u want to appear above keyboard
}

如果你不使用全屏，下面的类应该足够了:

class AndroidBug5497Workaround{
    View svChildLayout;
    int originalGravity;
    Activity activity;
    /**
     * @param activity
     * @param svChildLayoutId  id of the layout that is the first child of the center ScrollView
     */
    public static void assistActivity (Activity activity, int svChildLayoutId) {
        new AndroidBug5497Workaround(activity, svChildLayoutId);
    }

    private AndroidBug5497Workaround(Activity activity, int svChildLayoutId) {
        this.activity = activity;
        svChildLayout = activity.findViewById(svChildLayoutId);
        originalGravity = ((ScrollView.LayoutParams)svChildLayout.getLayoutParams()).gravity;
        //Add listener
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        mChildOfContent = content.getChildAt(0);
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                possiblyResizeChildOfContent2();
            }
        });
    }
    private void possiblyResizeChildOfContent2() {
        int usableHeightNow = computeUsableHeight();
        if (usableHeightNow != usableHeightPrevious) {
            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
            int heightDifference = usableHeightSansKeyboard - usableHeightNow;
            if (heightDifference > (usableHeightSansKeyboard/4)) {
                // keyboard probably just became visible
                onKeyboardVisible();
            } else {
                // keyboard probably just became hidden
                onKeyboardHidden();
            }
            usableHeightPrevious = usableHeightNow;
        }
    }

    private void onKeyboardVisible() {
        ScrollView.LayoutParams params = (ScrollView.LayoutParams) svChildLayout.getLayoutParams();
        params.gravity = Gravity.TOP;
        svChildLayout.requestLayout();
        final ScrollView parentSv = (ScrollView) svChildLayout.getParent();
        parentSv.post(new Runnable() {
            @Override
            public void run() {
                View focusedEditText = activity.getWindow().getCurrentFocus();
                parentSv.smoothScrollTo(0, focusedEditText.getTop() );
            }
        });
    }
    private void onKeyboardHidden() {
        ScrollView.LayoutParams params = (ScrollView.LayoutParams) svChildLayout.getLayoutParams();
        params.gravity = originalGravity;
        svChildLayout.requestLayout();
    }
}

---

如果你使用全屏，你需要下面的类(从windowSoftInputMode="adjustResize"不支持半透明操作(导航栏):

    public class AndroidBug5497Workaround {
        // For more information, see https://code.google.com/p/android/issues/detail?id=5497
        // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.
        public static void assistActivity (Activity activity, int svChildLayoutId) {
            new AndroidBug5497Workaround(activity, svChildLayoutId);
        }
        private View mChildOfContent;
        private int usableHeightPrevious;
        private FrameLayout.LayoutParams frameLayoutParams;
        View svChildLayout;
        int originalGravity;
        Activity activity;
        private AndroidBug5497Workaround(Activity activity, int svChildLayoutId) {

        this.activity = activity;
        svChildLayout = activity.findViewById(svChildLayoutId);
        originalGravity = ((ScrollView.LayoutParams)svChildLayout.getLayoutParams()).gravity;
            FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
            mChildOfContent = content.getChildAt(0);
            mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                public void onGlobalLayout() {
                    possiblyResizeChildOfContent();
                }
            });
            frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
        }
        private void possiblyResizeChildOfContent() {
            int usableHeightNow = computeUsableHeight();
            if (usableHeightNow != usableHeightPrevious) {
                int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
                int heightDifference = usableHeightSansKeyboard - usableHeightNow;
                if (heightDifference > (usableHeightSansKeyboard/4)) {
                    // keyboard probably just became visible
onKeyboardVisible();                    
frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
                } else {
                    // keyboard probably just became hidden
onKeyboardHidden();                    
frameLayoutParams.height = usableHeightSansKeyboard;
                }
                mChildOfContent.requestLayout();
                usableHeightPrevious = usableHeightNow;
            }
        }
        private int computeUsableHeight() {

               Rect r = new Rect();
                mChildOfContent.getWindowVisibleDisplayFrame(r);
                return (r.bottom - r.top);
            }
private void onKeyboardVisible() {
        ScrollView.LayoutParams params = (ScrollView.LayoutParams) svChildLayout.getLayoutParams();
        params.gravity = Gravity.TOP;
        svChildLayout.requestLayout();
        final ScrollView parentSv = (ScrollView) svChildLayout.getParent();
        parentSv.post(new Runnable() {
            @Override
            public void run() {
                View focusedEditText = activity.getWindow().getCurrentFocus();
                parentSv.smoothScrollTo(0, focusedEditText.getTop() );
            }
        });
    }
    private void onKeyboardHidden() {
        ScrollView.LayoutParams params = (ScrollView.LayoutParams) svChildLayout.getLayoutParams();
        params.gravity = originalGravity;
        svChildLayout.requestLayout();
    }
    }