前言

　　解決痛點在設定  android:focusableInTouchMode="true" 後，用觸控點選不需要點選2次，關鍵是 isInTouchMode 

程式碼

package com.lwlx.factorytest.expand

\import android.util.Log
import android.view.View

private var clickInterval = 400L
private var lastTime = 0L
fun View.setOnIntervalClickListener(onIntervalClickListener: (View) 
 
-> Unit) {
    this.setOnClickListener {
        if (System.currentTimeMillis() - lastTime > clickInterval) {
            lastTime = System.currentTimeMillis()
            onIntervalClickListener.invoke(it)
        }
    }
}

/**
 * 設定焦點放大
 */
fun View.setFocusEnlarge() {
    this.setOnFocusChangeListener { view, b ->
        if
 
 (b) {
            this.scaleX = 1.1f
            this.scaleY = 1.1f
        } else {
            this.scaleX = 1.0f
            this.scaleY = 1.0f
        }
    }
}

private var assistRequestFocusInterval = 400L
private var assistRequestFocusLastTime = 0L

/**
 * 輔助獲取焦點，防止獲取焦點後立即執行點選
 */
fun View.assistRequestFocus(){
    assistRequestFocusLastTime 
 
= System.currentTimeMillis()
    this.requestFocus()
}

/**
 * 設定焦點放大並且加邊框
 */
fun View.setFocusEnlargeFrame(res:Int) {
    this.setOnFocusChangeListener { view, b ->
        if (b && this.isInTouchMode && System.currentTimeMillis() - assistRequestFocusLastTime > assistRequestFocusInterval){
            Log.e("zh", ":performClick ")
            assistRequestFocusLastTime = System.currentTimeMillis()
            this.performClick()
        }
        if (b) {
            this.setBackgroundResource(res)
            this.setPadding(1,1,1,1)
            this.scaleX = 1.1f
            this.scaleY = 1.1f
        } else {
            this.setBackgroundResource(android.R.color.transparent)
            this.setPadding(0,0,0,0)
            this.scaleX = 1.0f
            this.scaleY = 1.0f
        }
    }
}

/**
 * 設定焦點放大並且加邊框,並且加點選
 */
fun View.setFocusEnlargeFrameAndClick(res:Int, onIntervalClickListener: (View) -> Unit) {
    setOnIntervalClickListener(onIntervalClickListener)
    this.setOnFocusChangeListener { view, b ->
        if (b && this.isInTouchMode && System.currentTimeMillis() - assistRequestFocusLastTime > assistRequestFocusInterval){
            Log.e("zh", ":performClick ")
            assistRequestFocusLastTime = System.currentTimeMillis()
            this.performClick()
        }
        if (b) {
            this.setBackgroundResource(res)
            this.setPadding(1,1,1,1)
            this.scaleX = 1.1f
            this.scaleY = 1.1f
        } else {
            this.setBackgroundResource(android.R.color.transparent)
            this.setPadding(0,0,0,0)
            this.scaleX = 1.0f
            this.scaleY = 1.0f
        }
    }
}

Fragment中獲取焦點

public class BaseFragment extends com.lwlx.common.base.BaseFragment {
    public boolean mIsGetTheFocus = false;

    @Override
    public void onResume() {
        super.onResume();
        mIsGetTheFocus = false;
    }

    public void setFocus(){
        if (!mIsGetTheFocus){
            mIsGetTheFocus = true;
            if (getView() != null){
                getView().requestFocus();
            }
        }
    }
}

activity裡

    override fun onKeyUp(keyCode: Int, event: KeyEvent?): Boolean {
        if (keyCode == KeyEvent.KEYCODE_BACK){
            return true
        }
        if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT){
            (supportFragmentManager.fragments[mBinding.viewPage.currentItem] as BaseFragment).setFocus()
            return true
        }
        return super.onKeyUp(keyCode, event)
    }

End