[英]when I'm pressing Check which is“chckAns” button my app is suddenly kept crashing
[英]My app is crashing when I call my function by pressing a button
我正在嘗試制作一個簡單的畫廊應用程序。 當我嘗試這段代碼時:
public void previousTap(View view){
ImageView img = (ImageView) view;
if (img.getTag() == "img_one") {
img.setImageResource(R.drawable.img_five);
img.setTag("img_five");
} else if (img.getTag() == "img_two") {
img.setImageResource(R.drawable.img_one);
img.setTag("img_one");
} else if (img.getTag() == "img_three") {
img.setImageResource(R.drawable.img_two);
img.setTag("img_two");
} else if (img.getTag() == "img_four") {
img.setImageResource(R.drawable.img_three);
img.setTag("img_three");
} else if (img.getTag() == "img_five") {
img.setImageResource(R.drawable.img_four);
img.setTag("img_four");
}
}
當我運行我的項目並安裝應用程序並單擊上一個按鈕時,我的應用程序崩潰了。 為什么? 另外,有什么方法可以在 activity_main.xml 中獲取 imageview 的標簽,而不是輸入“ImageView img = (ImageView) view;”(僅在錯誤的情況下)?
我得到的錯誤:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.wali.photoframegallery, PID: 6166
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:402)
at android.view.View.performClick(View.java:6603)
at android.view.View.performClickInternal(View.java:6576)
at android.view.View.access$3100(View.java:780)
at android.view.View$PerformClick.run(View.java:26090)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:235)
at android.app.ActivityThread.main(ActivityThread.java:6760)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:911)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:6603)
at android.view.View.performClickInternal(View.java:6576)
at android.view.View.access$3100(View.java:780)
at android.view.View$PerformClick.run(View.java:26090)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:235)
at android.app.ActivityThread.main(ActivityThread.java:6760)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:911)
Caused by: java.lang.ClassCastException: androidx.appcompat.widget.AppCompatButton cannot be cast to android.widget.ImageView
at com.wali.photoframegallery.MainActivity.nextTap(MainActivity.java:32)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:6603)
at android.view.View.performClickInternal(View.java:6576)
at android.view.View.access$3100(View.java:780)
at android.view.View$PerformClick.run(View.java:26090)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:235)
at android.app.ActivityThread.main(ActivityThread.java:6760)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:911)
編輯:我試着改變這個:
ImageView img = (ImageView) view;
對此:
View img = (View) view;
它沒有給我任何錯誤,但沒有更多功能。 現在怎么了?
您可以在下一行看到您的問題Caused by: java.lang.ClassCastException: androidx.appcompat.widget.AppCompatButton cannot be cast to android.widget.ImageView
您可以嘗試在 AppCompatButton 中投射視圖,或在布局中將 AppCompatButton 更改為 ImageView
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