Android: Detect softkeyboard open

问题:

When the soft keyboard opens I want a scroll view to scroll down to the bottom.

For this I can use: fullScroll(View.FOCUS_DOWN);

But how do I fire that command after the soft keyboard opening event triggers?

回答1:

Per this post and this post on android-developers it doesn't seem like it's possible to do what you want. You may want to re-examine your use case for what you're doing. Maybe one of the softInputMode flags will work for you.

回答2:

Here is my solution:

1/ A simple interface

public interface KeyboardVisibilityListener {
    void onKeyboardVisibilityChanged(boolean keyboardVisible);
}

2/ A utility method (put it where you want, for instance in a class named KeyboardUtil)

public static void setKeyboardVisibilityListener(Activity activity, KeyboardVisibilityListener keyboardVisibilityListener) {
    View contentView = activity.findViewById(android.R.id.content);
    contentView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        private int mPreviousHeight;

        @Override
        public void onGlobalLayout() {
            int newHeight = contentView.getHeight();
            if (mPreviousHeight != 0) {
                if (mPreviousHeight > newHeight) {
                    // Height decreased: keyboard was shown
                    keyboardVisibilityListener.onKeyboardVisibilityChanged(true);
                } else if (mPreviousHeight < newHeight) {
                    // Height increased: keyboard was hidden
                    keyboardVisibilityListener.onKeyboardVisibilityChanged(false);
                } else {
                    // No change
                }
            }
            mPreviousHeight = newHeight;
        }
    });
}

3/ Use from an Activity this way (a good place is in onCreate):

KeyboardUtil.setKeyboardVisibilityListener(this, mKeyboardVisibilityListener);

回答3:

watching the date , possibly you have a solution for your question, otherwise:

Here is the same response i made to another question related : Is there a way to tell if the soft-keyboard is shown?

but i copy full response here to avoid dead links:

Please check Configuration Changes for your Activity

This for your AndroidManifest.xml

and this for your Activity class http://developer.android.com/reference/android/app/Activity.html#onConfigurationChanged(android.content.res.Configuration)

You will need to @Override the public method onConfigurationChanged(android.content.res.Configuration) of your Activity to be able to handle, for example, this values:
hardKeyboardHidden,
keyboard,
keyboardHidden

For all possible values check http://developer.android.com/reference/android/content/res/Configuration.html

You will see there something like this:

HARDKEYBOARDHIDDEN_NO   
HARDKEYBOARDHIDDEN_UNDEFINED    
HARDKEYBOARDHIDDEN_YES  
KEYBOARDHIDDEN_NO   
KEYBOARDHIDDEN_UNDEFINED    
KEYBOARDHIDDEN_YES  
KEYBOARD_12KEY  
KEYBOARD_NOKEYS 
KEYBOARD_QWERTY 
KEYBOARD_UNDEFINED

Also there you will be able to read something like this:

public int  hardKeyboardHidden  A flag indicating whether the hard keyboard has been      hidden.
public int  keyboard    The kind of keyboard attached to the device.
public int  keyboardHidden  A flag indicating whether any keyboard is available.

UPDATE:

Here is a specific sample of what i´m talking about:

http://developer.android.com/guide/topics/resources/runtime-changes.html

    
@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);

    // Checks the orientation of the screen
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
        Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
    } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
        Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
    }
    // Checks whether a hardware keyboard is available
    if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_NO) {
        Toast.makeText(this, "keyboard visible", Toast.LENGTH_SHORT).show();
    } else if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_YES) {
        Toast.makeText(this, "keyboard hidden", Toast.LENGTH_SHORT).show();
    }
}

I hope this help you

回答4:

The only way I was able to work around this is by setting my activity's android:windowSoftInputMode="adjustResize" and then embed a custom "detector view" in the layout to handle a container size change and propagate that as a custom event (via a Listener) for soft keyboard on/off.

The following post describes an approach to implementing it: EditText does not trigger changes when back is pressed

回答5:

This works for me

parent.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {

            boolean someHasFocus = false;

            if(host.hasFocus())
                someHasFocus = true;
            if(folder.hasFocus())
                someHasFocus = true;
            if(user.hasFocus())
                someHasFocus = true;
            if(pass.hasFocus())
                someHasFocus = true;

            if(someHasFocus){
                if(bottom>oldBottom){
                    // Keyboard Close
                    viewToHide.setVisibility(View.VISIBLE);

                }else if(bottom<oldBottom){
                   // Keyboard Open
                    viewToHide.setVisibility(View.GONE);
                }

            }else{
                // show
                viewToHide.setVisibility(View.VISIBLE);
            }
        }
    });

Where parent is the main layout, viewToHide is the view that shows or hides when the keyboard is shown, and host,folder,user and pass are the EditText of my form.

And this in the manifest

android:windowSoftInputMode="stateHidden|adjustResize"

Hope this help

回答6:

Here is my solution. It doesn't need android:windowSoftInputMode="adjustResize"

public abstract class KeyboardActivity extends Activity {
    public static final int MIN_KEYBOARD_SIZE = 100;
    private Window mRootWindow;
    private View mRootView;
    private int mKeyboardHeight = -1;
    private ViewTreeObserver.OnGlobalLayoutListener mGlobalLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {

    public int height;
    public void onGlobalLayout() {
            Rect r = new Rect();
        View view = mRootWindow.getDecorView();
        view.getWindowVisibleDisplayFrame(r);
        if (height != r.height()) {
            int diff = height - r.height();
            height = r.height();
            if (Math.abs(diff) > MIN_KEYBOARD_SIZE) {
                int diff = height - r.height();
                if (height != 0 && Math.abs(diff) > MIN_KEYBOARD_SIZE) {
                    mKeyboardHeight = Math.abs(diff);
                    if (diff > 0) {
                        onKeyboardOpen();
                    } else {
                        onKeyboardClosed();
                    }
                }
                height = r.height();
            }
        }
    };

    protected abstract void onKeyboardClosed();

    protected abstract void onKeyboardOpen();

    /**
     * Should return keyboard height, if keyboard was shown at least once;
     * @return keyboard height or -1
     */
    protected int getKeyboardHeight() {
        return mKeyboardHeight;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mRootWindow = getWindow();
        mRootView = mRootWindow.getDecorView().findViewById(android.R.id.content);
    }

    @Override
    protected void onStart() {
        super.onStart();
        mRootView.getViewTreeObserver().addOnGlobalLayoutListener(mGlobalLayoutListener);
    }

    @Override
    protected void onStop() {
        super.onStop();
        mRootView.getViewTreeObserver().removeOnGlobalLayoutListener(mGlobalLayoutListener);
    }
}

Then I've just extend my activity from this activity and override onKeyboardClosed/onKeyboardOpen methods.

回答7:

for this what i used to do same:

  import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

public class SoftKeyboard implements View.OnFocusChangeListener
{
    private static final int CLEAR_FOCUS = 0;

    private ViewGroup layout;
    private int layoutBottom;
    private InputMethodManager im;
    private int[] coords;
    private boolean isKeyboardShow;
    private SoftKeyboardChangesThread softKeyboardThread;
    private List<EditText> editTextList;

    private View tempView; // reference to a focused EditText

    public SoftKeyboard(ViewGroup layout, InputMethodManager im)
    {
        this.layout = layout;
        keyboardHideByDefault();
        initEditTexts(layout);
        this.im = im;
        this.coords = new int[2];
        this.isKeyboardShow = false;
        this.softKeyboardThread = new SoftKeyboardChangesThread();
        this.softKeyboardThread.start();
    }


    public void openSoftKeyboard()
    {
        if(!isKeyboardShow)
        {
            layoutBottom = getLayoutCoordinates();
            im.toggleSoftInput(0, InputMethodManager.SHOW_IMPLICIT);
            softKeyboardThread.keyboardOpened();
            isKeyboardShow = true;
        }
    }

    public void closeSoftKeyboard()
    {
        if(isKeyboardShow)
        {
            im.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
            isKeyboardShow = false;
        }
    }

    public void setSoftKeyboardCallback(SoftKeyboardChanged mCallback)
    {
        softKeyboardThread.setCallback(mCallback);
    }

    public void unRegisterSoftKeyboardCallback()
    {
        softKeyboardThread.stopThread();
    }

    public interface SoftKeyboardChanged
    {
        public void onSoftKeyboardHide();
        public void onSoftKeyboardShow();
    }

    private int getLayoutCoordinates()
    {
        layout.getLocationOnScreen(coords);
        return coords[1] + layout.getHeight();
    }

    private void keyboardHideByDefault()
    {
        layout.setFocusable(true);
        layout.setFocusableInTouchMode(true);
    }

    /*
     * InitEditTexts now handles EditTexts in nested views
     * Thanks to Francesco Verheye ([e-mail])
     */
    private void initEditTexts(ViewGroup viewgroup)
    {
        if(editTextList == null)
            editTextList = new ArrayList<EditText>();

        int childCount = viewgroup.getChildCount();
        for(int i=0; i<= childCount-1;i++)
        {
            View v = viewgroup.getChildAt(i);

            if(v instanceof ViewGroup)
            {
                initEditTexts((ViewGroup) v);
            }

            if(v instanceof EditText)
            {
                EditText editText = (EditText) v;
                editText.setOnFocusChangeListener(this);
                editText.setCursorVisible(true);
                editTextList.add(editText);
            }
        }
    }

    /*
     * OnFocusChange does update tempView correctly now when keyboard is still shown
     * Thanks to Israel Dominguez ([e-mail])
     */
    @Override
    public void onFocusChange(View v, boolean hasFocus)
    {
        if(hasFocus)
        {
            tempView = v;
            if(!isKeyboardShow)
            {
                layoutBottom = getLayoutCoordinates();
                softKeyboardThread.keyboardOpened();
                isKeyboardShow = true;
            }
        }
    }

    // This handler will clear focus of selected EditText
    private final Handler mHandler = new Handler()
    {
        @Override
        public void handleMessage(Message m)
        {
            switch(m.what)
            {
                case CLEAR_FOCUS:
                    if(tempView != null)
                    {
                        tempView.clearFocus();
                        tempView = null;
                    }
                    break;
            }
        }
    };

    private class SoftKeyboardChangesThread extends Thread
    {
        private AtomicBoolean started;
        private SoftKeyboardChanged mCallback;

        public SoftKeyboardChangesThread()
        {
            started = new AtomicBoolean(true);
        }

        public void setCallback(SoftKeyboardChanged mCallback)
        {
            this.mCallback = mCallback;
        }

        @Override
        public void run()
        {
            while(started.get())
            {
                // Wait until keyboard is requested to open
                synchronized(this)
                {
                    try
                    {
                        wait();
                    } catch (InterruptedException e)
                    {
                        e.printStackTrace();
                    }
                }

                int currentBottomLocation = getLayoutCoordinates();

                // There is some lag between open soft-keyboard function and when it really appears.
                while(currentBottomLocation == layoutBottom && started.get())
                {
                    currentBottomLocation = getLayoutCoordinates();
                }

                if(started.get())
                    mCallback.onSoftKeyboardShow();

                // When keyboard is opened from EditText, initial bottom location is greater than layoutBottom
                // and at some moment equals layoutBottom.
                // That broke the previous logic, so I added this new loop to handle this.
                while(currentBottomLocation >= layoutBottom && started.get())
                {
                    currentBottomLocation = getLayoutCoordinates();
                }

                // Now Keyboard is shown, keep checking layout dimensions until keyboard is gone
                while(currentBottomLocation != layoutBottom && started.get())
                {
                    synchronized(this)
                    {
                        try
                        {
                            wait(500);
                        } catch (InterruptedException e)
                        {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                    currentBottomLocation = getLayoutCoordinates();
                }

                if(started.get())
                    mCallback.onSoftKeyboardHide();

                // if keyboard has been opened clicking and EditText.
                if(isKeyboardShow && started.get())
                    isKeyboardShow = false;

                // if an EditText is focused, remove its focus (on UI thread)
                if(started.get())
                    mHandler.obtainMessage(CLEAR_FOCUS).sendToTarget();
            }
        }

        public void keyboardOpened()
        {
            synchronized(this)
            {
                notify();
            }
        }

        public void stopThread()
        {
            synchronized(this)
            {
                started.set(false);
                notify();
            }
        }

    }
}

and in your Activity or fragment call this method in onCreate()

  private void hideAndShowKeyBOrd() {
        InputMethodManager im = (InputMethodManager) getActivity().getSystemService(Service.INPUT_METHOD_SERVICE);

/*
Instantiate and pass a callback
*/
        SoftKeyboard softKeyboard;
        softKeyboard = new SoftKeyboard(mainLayout, im);
        softKeyboard.setSoftKeyboardCallback(new SoftKeyboard.SoftKeyboardChanged() {

            @Override
            public void onSoftKeyboardHide() {
                new Handler(Looper.getMainLooper()).post(new Runnable() {
                    @Override
                    public void run() {
                    }
                });
            }

            @Override
            public void onSoftKeyboardShow() {
                new Handler(Looper.getMainLooper()).post(new Runnable() {
                    @Override
                    public void run() {
                        if (viewV.getVisibility() == View.VISIBLE) {
                            viewV.setVisibility(View.GONE);
                        }
                    }
                });

            }
        });
    }

enjoy your code:)

回答8:

@BoD's answer works fine if I remove the following line.

if (mPreviousHeight != 0) {
     /* other code is same, because
        mPreviousHeight is 0 when it comes first */
}