darsheel rathore darsheel rathore - 11 days ago 39
Android Question

Clearing all images causes a crash with ClassCastException

In a Tic-Tac-Toe game when I click "Play Again" button it should clear all the images in the GRID LAYOUT section.

I implemented this code in my project but from that moment my app crashes whenever I click on it.

GridLayout gridLayout = (GridLayout) findViewById(R.id.gridLayout);

for (int i = 0; i < gridLayout.getChildCount(); i++) {
((ImageView) gridLayout.getChildAt(i)).setImageResource(0);
}


My Android Plugin Version : 3.1.2

My Gradle Version :: 4.4

My full code:

package com.example.darsheel.gameconnect3;

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

public class MainActivity extends AppCompatActivity {

// 0 = yellow, 1 = red;
int activePlayer = 0;
boolean gameIsActive = true;

// 2 means unplayed
int[] gameState = {2, 2, 2, 2, 2, 2, 2, 2, 2};

int[][] winningPositions = {{0, 1, 2}, {3, 4, 5}, {6, 7, 8}, {0, 3, 6}, {1, 4, 7}, {2, 5, 8}, {0, 4, 8}, {2, 4, 6}};

public void dropIn(View view) {

ImageView counter = (ImageView) view;
int tappedCounter = Integer.parseInt(counter.getTag().toString());

if (gameState[tappedCounter] == 2 && gameIsActive == true) {

// This will make translation to -ve Y axis
counter.setTranslationY(-1000f);

gameState[tappedCounter] = activePlayer;

if (activePlayer == 0) {
counter.setImageResource(R.drawable.yellow);
activePlayer = 1;
} else {
counter.setImageResource(R.drawable.red);
activePlayer = 0;
}
counter.animate().translationYBy(1000f).rotation(3600).setDuration(500);


for (int[] winningPosition : winningPositions) {

if ((gameState[winningPosition[0]] == gameState[winningPosition[1]]) && (gameState[winningPosition[1]] == gameState[winningPosition[2]])
&& (gameState[winningPosition[2]] != 2)) {

TextView winnerMsg = (TextView) findViewById(R.id.winnerMessage);

// Someone wins
gameIsActive = false;

String winner = "RED";
if (gameState[winningPosition[0]] == 0)
winner = "YELLOW";

winnerMsg.setText(winner + " has Won!!");
LinearLayout layout = (LinearLayout) findViewById(R.id.playAgainLayout);
layout.setVisibility(View.VISIBLE);

}
}

}
}

public void playAgain(View view) {

gameIsActive = true;
LinearLayout layout = (LinearLayout)
findViewById(R.id.playAgainLayout);
layout.setVisibility(View.INVISIBLE);
activePlayer = 0;

for (int i = 0; i < gameState.length; i++) {
gameState[i] = 2;

}

GridLayout gridLayout = (GridLayout) findViewById(R.id.gridLayout);

for (int i = 0; i < gridLayout.getChildCount(); i++) {
((ImageView) gridLayout.getChildAt(i)).setImageResource(0);
}

}

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


My full xml code:

<?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"
tools:context=".MainActivity">

<android.support.v7.widget.GridLayout
android:id="@+id/gridLayout"
android:layout_width="0dp"
android:layout_height="360dp"
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:background="@drawable/board"
app:columnCount="3"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.497"
app:rowCount="3">

<ImageView
android:id="@+id/imageView0"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_margin="10dp"
android:onClick="dropIn"
android:tag="0"
app:layout_column="0"
app:layout_row="0" />

<ImageView
android:id="@+id/imageView1"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginBottom="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:onClick="dropIn"
android:tag="1"
app:layout_column="1"
app:layout_row="0" />

<ImageView
android:id="@+id/imageView2"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginBottom="10dp"
android:layout_marginRight="15dp"
android:layout_marginTop="10dp"
android:onClick="dropIn"
android:tag="2"
app:layout_column="2"
app:layout_row="0" />

<ImageView
android:id="@+id/imageView3"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="20dp"
android:onClick="dropIn"
android:tag="3"
app:layout_column="0"
app:layout_row="1" />

<ImageView
android:id="@+id/imageView4"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginBottom="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="20dp"
android:onClick="dropIn"
android:tag="4"
app:layout_column="1"
app:layout_row="1" />

<ImageView
android:id="@+id/imageView5"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginBottom="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="20dp"
android:onClick="dropIn"
android:tag="5"
app:layout_column="2"
app:layout_row="1" />

<ImageView
android:id="@+id/imageView6"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="20dp"
android:onClick="dropIn"
android:tag="6"
app:layout_column="0"
app:layout_row="2" />

<ImageView
android:id="@+id/imageView7"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginTop="20dp"
android:onClick="dropIn"
android:tag="7"
app:layout_column="1"
app:layout_row="2" />


<ImageView
android:id="@+id/imageView8"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginTop="20dp"
android:onClick="dropIn"
android:tag="8"
app:layout_column="2"
app:layout_row="2" />

</android.support.v7.widget.GridLayout>

<LinearLayout
android:id="@+id/playAgainLayout"
android:layout_width="wrap_content"
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:background="#ecf786"
android:orientation="vertical"
android:padding="40dp"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="@+id/gridLayout"
app:layout_constraintStart_toStartOf="@+id/gridLayout"
app:layout_constraintTop_toTopOf="parent">

<TextView
android:id="@+id/winnerMessage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp" />

<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="playAgain"
android:text="Play Again ?" />
</LinearLayout>

</android.support.constraint.ConstraintLayout>


LOGCAT info:

--------- beginning of crash
06-01 19:32:12.218 5059-5059/com.example.darsheel.gameconnect3 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.darsheel.gameconnect3, PID: 5059
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:389)
at android.view.View.performClick(View.java:6294)
at android.view.View$PerformClick.run(View.java:24770)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:384)
at android.view.View.performClick(View.java:6294) 
at android.view.View$PerformClick.run(View.java:24770) 
at android.os.Handler.handleCallback(Handler.java:790) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6494) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 
Caused by: java.lang.ClassCastException: android.support.v7.widget.GridLayout cannot be cast to android.widget.GridLayout
at com.example.darsheel.gameconnect3.MainActivity.playAgain(MainActivity.java:80)
at java.lang.reflect.Method.invoke(Native Method) 
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:384) 
at android.view.View.performClick(View.java:6294) 
at android.view.View$PerformClick.run(View.java:24770) 
at android.os.Handler.handleCallback(Handler.java:790) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6494) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 


enter image description here

Answer Source

It clearly shows a .ClassCastException with Grid Layout so just change the imports in the class as below.

Just import this. (Right)

import android.support.v7.widget.GridLayout

Instead of this. (Wrong)

import android.widget.GridLayout;

Because your XML contains this android.support.v7.widget.GridLayout.

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