更改所有ImageViews上的图像＆＃39;借助于TicTacToe中的getTag（）

Question

我正在制作一个TicTacToe，其中有一个网格背景，它包含九个ImageViews＆＃39;。

底部有一个重置按钮，点击它所有的ImageViews＆＃39;应该消失（将它们设置为白色）。

这是应用程序启动时的初始状态，再次单击重置按钮后会显示

以下是MainActivity.java： - 在btnTap函数中写什么，设置为重置按钮的OnClick，以便实现我的目的？

（除了getTag（）之外的任何其他逻辑将不胜感激）

package com.example.honey1.tictactoe;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity  

{

int active = 0;
int[] state = {2, 2, 2, 2, 2, 2, 2, 2, 2};


public void btnTap(View view)
{
    for (int i = 0; i < 9; i++)
    {
        if(state[i]!=2)
    {
   //What to write here?
    }
    }

}
public void imgTap(View view) {
    ImageView img = (ImageView) view;
    int tapped = Integer.parseInt(img.getTag().toString());

    if (state[tapped] == 2) {
        if (active == 0) {

            img.setImageResource(R.drawable.cross);
            img.animate().setDuration(1000).rotation(90);
            active = 1;
            state[tapped]=0;
        } else {

            img.setImageResource(R.drawable.circle);
            active = 0;;
            state[tapped]=1;
        }
    } else {
        Toast.makeText(getApplicationContext(), "Invalid Click!", Toast.LENGTH_SHORT).show();
    }
}

        @Override
    protected void onCreate (Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

XML文件：（此应用仅包含一项活动）

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/background"
    tools:context="com.example.honey1.tictactoe.MainActivity">

<LinearLayout
    android:id="@+id/linearLayout2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:orientation="horizontal"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.911"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp">

    <Button
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_weight="1"
        android:background="@drawable/button"
        android:onClick="btnTap"
        android:text="@string/btn"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.553"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.941"
        tools:text="@string/btn" />
</LinearLayout>

<ImageView
    android:id="@+id/h"
    android:tag="0"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.086"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.223"
    app:srcCompat="@android:color/background_light" />

<ImageView
    android:id="@+id/f"
    android:tag="1"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.501"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.223"
    app:srcCompat="@android:color/background_light" />

<ImageView
    android:id="@+id/b"
    android:tag="2"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"

    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.899"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.223"
    app:srcCompat="@android:color/background_light" />

<ImageView
    android:id="@+id/i"
    android:tag="3"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="3dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="3dp"
    android:layout_marginTop="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.101"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.436"
    app:srcCompat="@android:color/background_light" />

<ImageView
    android:id="@+id/g"
    android:tag="4"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.501"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.436"
    app:srcCompat="@android:color/background_light" />

<ImageView
    android:id="@+id/a"
    android:tag="5"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.899"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.436"
    app:srcCompat="@android:color/background_light"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp" />

<ImageView
    android:id="@+id/d"
    android:tag="6"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.086"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.655"
    app:srcCompat="@android:color/background_light" />

<ImageView
    android:id="@+id/c"
    android:tag="7"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.501"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.655"
    app:srcCompat="@android:color/background_light" />

<ImageView
    android:id="@+id/e"
    android:tag="8"
    android:layout_width="69dp"
    android:layout_height="57dp"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:onClick="imgTap"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.876"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.661"
    app:srcCompat="@android:color/background_light"
    android:layout_marginStart="8dp" />

Answer 1

您无需识别ImageView，甚至无需检查哪些更改，只需迭代它们并根据需要进行设置。并且不要忘记将所有状态设置为2

for(int index=0; index<((ViewGroup)viewGroup).getChildCount(); ++index) {
    View nextChild = ((ViewGroup)viewGroup).getChildAt(index);
    if(nextChild instanceof ImageView){
        //remove image
    }
}