Java 我是 Android 開發的新手，我正在開發簡單的井字游戲。當我單擊按鈕時，應用程式崩潰了。這是一個交叉和圓圈游戲，匹配三個連續交叉或圓圈的人獲勝。游戲完成后，會出現 Textview 和 Button。目的是在點擊再次播放按鈕后，游戲應該重新開始。這是Java中的代碼。
package com.example.tictactoe;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.GridLayout;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
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}};
int activePlayer = 0;
boolean gameActive = true;
public void dropIn(View view) {
ImageView counter = (ImageView) view;
int tappedCounter = Integer.parseInt(counter.getTag().toString());
if (gameState[tappedCounter] == 2 && gameActive) {
gameState[tappedCounter] = activePlayer;
counter.setTranslationY(-1500);
if (activePlayer == 0) {
counter.setImageResource(R.drawable.o);
activePlayer = 1;
} else {
counter.setImageResource(R.drawable.x);
activePlayer = 0;
}
counter.animate().translationYBy(1500).rotation(3600).setDuration(300);
for (int[] winningPosition : winningPositions) {
if (gameState[winningPosition[0]] == gameState[winningPosition[1]] && gameState[winningPosition[1]] == gameState[winningPosition[2]] && gameState[winningPosition[0]] != 2) {
// Somone has won!
gameActive = false;
String winner = "";
if (activePlayer == 1) {
winner = "Circle";
} else {
winner = "Cross";
}
Button playAgainButton = (Button) findViewById(R.id.playAgainButton);
TextView winnerTextView = (TextView) findViewById(R.id.winnerTextView);
winnerTextView.setText(winner " has won!");
playAgainButton.setVisibility(View.VISIBLE);
winnerTextView.setVisibility(View.VISIBLE);
}
}
}
}
public void playAgain(View view) {
Button playAgainButton = (Button) findViewById(R.id.playAgainButton);
TextView winnerTextView = (TextView) findViewById(R.id.winnerTextView);
playAgainButton.setVisibility(View.INVISIBLE);
winnerTextView.setVisibility(View.INVISIBLE);
GridLayout gridLayout = (GridLayout) findViewById(R.id.gridLayout);
for(int i=0; i<gridLayout.getChildCount(); i ) {
ImageView counter = (ImageView) gridLayout.getChildAt(i);
counter.setImageDrawable(null);
}
for (int i=0; i<gameState.length; i ) {
gameState[i] = 2;
}
activePlayer = 0;
gameActive = true;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
單擊按鈕時的 Logcat。
2022-01-26 00:03:53.763 11101-11101/com.example.tictactoe E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.tictactoe, PID: 11101
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:446)
at android.view.View.performClick(View.java:7448)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
at android.view.View.performClickInternal(View.java:7425)
at android.view.View.access$3600(View.java:810)
at android.view.View$PerformClick.run(View.java:28305)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:441)
at android.view.View.performClick(View.java:7448)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
at android.view.View.performClickInternal(View.java:7425)
at android.view.View.access$3600(View.java:810)
at android.view.View$PerformClick.run(View.java:28305)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.ClassCastException: androidx.gridlayout.widget.GridLayout cannot be cast to android.widget.GridLayout
at com.example.tictactoe.MainActivity.playAgain(MainActivity.java:95)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:441)
at android.view.View.performClick(View.java:7448)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
at android.view.View.performClickInternal(View.java:7425)
at android.view.View.access$3600(View.java:810)
at android.view.View$PerformClick.run(View.java:28305)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
這是按鈕的 XML。
<Button
android:id="@ id/playAgainButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="162dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="162dp"
android:layout_marginBottom="21dp"
android:onClick="playAgain"
android:text="Play Again"
android:visibility="invisible"
app:layout_constraintBottom_toTopOf="@ id/gridLayout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@ id/winnerTextView" />
我不確定如何解決這個問題，點擊再次播放按鈕后游戲應該重新啟動。所以希望有人可以提供幫助。謝謝。
uj5u.com熱心網友回復：
原因：java.lang.ClassCastException：androidx.gridlayout.widget.GridLayout 無法在 com.example.tictactoe.MainActivity.playAgain(MainActivity.java:95) 處轉換??為 android.widget.GridLayout
修復此類強制轉換例外。
編輯：
GridLayout gridLayout = (GridLayout) findViewById(R.id.gridLayout);
^
This thing
我不使用這個框架。
如果你寫過findViewById......也許它以某種方式回傳了錯誤的型別......就像那個東西可能回傳andoidX.bladibla.gridLayout而不是android.bladibla.gridlayout這樣檢查。
還有
import androidx.appcompat.app.AppCompatActivity;
這是您示例的頂部。它里面有一個X......所以也許看看這是怎么回事。
無論如何......這是你的問題......班級演員。這就是你必須研究的。
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