Android KeyBoard.Key disable iconPreview special keys?

Question

I customize my own soft keyboard by implementing the KeyboardView.OnKeyboardActionListener interface.

Pressing the keys displays a preview popup.

My problem is how to disable the preview popup for special keys like SHIFT and DELETE?

I tried to set the android: iconPreview attribute to null, but that didn't work.

<Key android:codes="-1" android:keyIcon="@drawable/key_shift" android:keyWidth="15%p" android:isModifier="true" android:isSticky="true" android:keyEdgeFlags="left" /> 

Any ideas?

Thanks in advance!

Answer 1

First you must implement OnKeyboardActionListener

then use onPress () and onRelease () to control the preview popup as follows:

 public void onPress(int primaryCode) { if (primaryCode==-2||primaryCode==-5||primaryCode==-4){ mInputView.setPreviewEnabled(false); } } public void onRelease(int primaryCode) { mInputView.setPreviewEnabled(true); } 

Answer 2

 public void onCreate() { mInputView.setPreviewEnabled(false); } public void onPress(int primaryCode) { if (primaryCode==-1||primaryCode==-2||primaryCode==-5||primaryCode==-4){ } else { mInputView.setPreviewEnabled(true); } } public void onRelease(int primaryCode) { mInputView.setPreviewEnabled(false); } 

Answer 3

The problem with the above solution, as commented, is that

if I press another key (e.g. A key) and place my finger on the SHIFT key, the preview icon still pops up

To counter this, I had to extend the KeyboardView class. Disclaimer - The following contains an API reflection

Here is a modified Keyboard class

 import android.content.Context import android.inputmethodservice.KeyboardView import android.os.Build import android.support.annotation.RequiresApi import android.util.AttributeSet import android.view.MotionEvent import android.view.View import android.widget.TextView import com.continental.testapplication.utils.dpToPx import java.lang.reflect.Method class ModifiedKeyboardView :KeyboardView{ constructor(context: Context, attrs: AttributeSet):super(context, attrs) constructor(context: Context, attrs: AttributeSet, defStyleAttr:Int):super(context, attrs, defStyleAttr) @RequiresApi(Build.VERSION_CODES.LOLLIPOP) constructor(context: Context, attrs: AttributeSet, defStyleAttr:Int, defStyleRes:Int): super(context, attrs, defStyleAttr, defStyleRes) /** * Return true, if preview is to be shown, false otherwise. If not implemented, * the preview is going to be shown..... */ var keyPreviewIndexListener:((Int)->Boolean) ?= null private val findKeyIndicesMethod:Method = KeyboardView::class.java.getDeclaredMethod( "getKeyIndices",Int::class.java,Int::class.java, (IntArray::class).java).also { it.isAccessible = true } private val previewText:TextView = KeyboardView::class.java.getDeclaredField( "mPreviewText").let { it.isAccessible = true it.get(this) as TextView } override fun onTouchEvent(me: MotionEvent?): Boolean { if(me == null) return super.onTouchEvent(me) when(me.action){ MotionEvent.ACTION_DOWN -> isPreviewEnabled = true MotionEvent.ACTION_MOVE -> { val touchX = me.x - paddingLeft var touchY = me.y.toInt() - paddingTop val verticalCorrection = dpToPx(14f, context) if (touchY >= -verticalCorrection) touchY += verticalCorrection.toInt() val keyIndex:Int = findKeyIndicesMethod.invoke(this, touchX.toInt(), touchY.toInt(), null) as Int isPreviewEnabled = keyPreviewIndexListener?.invoke(keyIndex)?:true if(!isPreviewEnabled){ previewText.visibility = View.INVISIBLE } } } return super.onTouchEvent(me) } } 

Insert as is.

Further in the class where you manipulate the keyboard,

  keyboardView.keyPreviewIndexListener = { it != spaceIndex && it != doneIndex && it != deleteIndex && it != 'your_custom_index' } 

To find indexes, you can simply do the following

  doneIndex = keyboardView.keyboard.keys.indexOfFirst { it.codes[0] == Keyboard.KEYCODE_DONE } 

This will prevent movement. Please add another solution as well.

those.

 override fun onPress(primaryCode: Int) { Log.e("onPress", primaryCode.toString()) checkAndActivatePreview(primaryCode) } override fun onRelease(primaryCode: Int) { Log.e("onRelease", primaryCode.toString()) deactivatePreview() } private fun checkAndActivatePreview(primaryCode: Int) { keyboard.isPreviewEnabled = (primaryCode != 'your_custom_code' && primaryCode != SPACE_KEY_CODE && primaryCode != Keyboard.KEYCODE_DELETE && primaryCode != Keyboard.KEYCODE_DONE) }