我正在开发一个项目，我比较两个项目图像，所以如果两个项目在点击这些项目后会有相同的图像，它应该从GridView中永久删除。我的代码如下所示，此代码遇到问题。请任何人帮助我。
MainActivity.java
public class MainActivity extends Activity {
Context ctx;
int imagesArray[];
GridViewContent adapter;
List<Integer> pictures, pictureList;
boolean flage = false;
int save1, save2;
int img1 = -1, img2 = -1;
public int OriginalArray[] = { R.drawable.sample_0, R.drawable.sample_1,
R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_0,
R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3 };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
shuffleArray();
final GridView grid = (GridView) findViewById(R.id.gv_memory);
grid.setAdapter(new GridViewContent(this));
}
private void shuffleArray() {
// TODO Auto-generated method stub
pictures = new ArrayList<Integer>();
for (int index = 0; index < OriginalArray.length; index++) {
pictures.add(OriginalArray[index]);
}
Collections.shuffle(pictures);
}
public class GridViewContent extends BaseAdapter {
private Context context;
private List<Integer> pictureList = new ArrayList<Integer>();
public GridViewContent(Context c) {
context = c;
for (int i = 0; i < 8; i++) {
pictureList.add(R.drawable.question);
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return (pictureList.size());
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return pictureList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(final int position, final View arg1,
final ViewGroup arg2) {
// TODO Auto-generated method stub
final ImageView myimage = new ImageView(context);
myimage.setImageResource(pictureList.get(position));
// myimage.setImageResource(pictures.get(pictureArray[position]));
myimage.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
myimage.setLayoutParams(new GridView.LayoutParams(70, 70));
final GridView grid = (GridView) findViewById(R.id.gv_memory);
myimage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
myimage.setImageResource(pictures.get(position));
// View v1 = new View(context);
if (flage == false) {
img1 = pictures.get(position);
// v1 = arg2.getChildAt(position);
save1 = position;
flage = true;
} else if (flage == true) {
img2 = pictures.get(position);
save2 = position;
checkResult(save1, save2);
flage = false;
}
// else if(f)
}
});
return myimage;
}
}
public void checkResult(int s1, int s2) {
if (img1 == img2) {
pictureList.remove(s1); //this is line no 116
pictureList.remove(s1);
adapter.notifyDataSetChanged();
Toast.makeText(MainActivity.this, "Congratualatin !!!!",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this, "Sorry!!!!", Toast.LENGTH_LONG)
.show();
final GridView grid = (GridView) findViewById(R.id.gv_memory);
grid.setAdapter(new GridViewContent(this));
}
}
}
logcat的。
03-14 01:07:12.791: D/dalvikvm(1598): GC_FOR_ALLOC freed 38K, 7% free 2771K/2980K, paused 183ms, total 185ms
03-14 01:07:12.811: I/dalvikvm-heap(1598): Grow heap (frag case) to 3.943MB for 1127536-byte allocation
03-14 01:07:12.941: D/dalvikvm(1598): GC_FOR_ALLOC freed 2K, 6% free 3870K/4084K, paused 128ms, total 128ms
03-14 01:07:13.111: D/dalvikvm(1598): GC_FOR_ALLOC freed 4K, 5% free 4253K/4448K, paused 25ms, total 26ms
03-14 01:07:13.143: I/dalvikvm-heap(1598): Grow heap (frag case) to 5.688MB for 1440016-byte allocation
03-14 01:07:13.271: D/dalvikvm(1598): GC_FOR_ALLOC freed <1K, 4% free 5659K/5856K, paused 127ms, total 127ms
03-14 01:07:13.481: I/Choreographer(1598): Skipped 49 frames! The application may be doing too much work on its main thread.
03-14 01:07:13.571: D/gralloc_goldfish(1598): Emulator without GPU emulation detected.
03-14 01:08:36.011: D/dalvikvm(1598): GC_FOR_ALLOC freed 357K, 9% free 5587K/6116K, paused 34ms, total 35ms
03-14 01:08:36.021: I/dalvikvm-heap(1598): Grow heap (frag case) to 6.543MB for 971296-byte allocation
03-14 01:08:36.154: D/dalvikvm(1598): GC_FOR_ALLOC freed 1K, 8% free 6534K/7068K, paused 123ms, total 123ms
03-14 01:08:39.422: D/dalvikvm(1598): GC_FOR_ALLOC freed 2385K, 8% free 5419K/5876K, paused 76ms, total 78ms
03-14 01:08:39.492: D/dalvikvm(1598): GC_FOR_ALLOC freed 1K, 4% free 5654K/5876K, paused 40ms, total 41ms
03-14 01:08:41.352: D/AndroidRuntime(1598): Shutting down VM
03-14 01:08:41.352: W/dalvikvm(1598): threadid=1: thread exiting with uncaught exception (group=0x41465700)
03-14 01:08:41.532: E/AndroidRuntime(1598): FATAL EXCEPTION: main
03-14 01:08:41.532: E/AndroidRuntime(1598): java.lang.NullPointerException
03-14 01:08:41.532: E/AndroidRuntime(1598): at com.example.memoryforkids.MainActivity.checkResult(MainActivity.java:116)
03-14 01:08:41.532: E/AndroidRuntime(1598): at com.example.memoryforkids.MainActivity$GridViewContent$1.onClick(MainActivity.java:102)
03-14 01:08:41.532: E/AndroidRuntime(1598): at android.view.View.performClick(View.java:4240)
03-14 01:08:41.532: E/AndroidRuntime(1598): at android.view.View$PerformClick.run(View.java:17721)
03-14 01:08:41.532: E/AndroidRuntime(1598): at android.os.Handler.handleCallback(Handler.java:730)
03-14 01:08:41.532: E/AndroidRuntime(1598): at android.os.Handler.dispatchMessage(Handler.java:92)
03-14 01:08:41.532: E/AndroidRuntime(1598): at android.os.Looper.loop(Looper.java:137)
03-14 01:08:41.532: E/AndroidRuntime(1598): at android.app.ActivityThread.main(ActivityThread.java:5103)
03-14 01:08:41.532: E/AndroidRuntime(1598): at java.lang.reflect.Method.invokeNative(Native Method)
03-14 01:08:41.532: E/AndroidRuntime(1598): at java.lang.reflect.Method.invoke(Method.java:525)
03-14 01:08:41.532: E/AndroidRuntime(1598): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
03-14 01:08:41.532: E/AndroidRuntime(1598): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-14 01:08:41.532: E/AndroidRuntime(1598): at dalvik.system.NativeStart.main(Native Method)
main.xml
<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gv_memory"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="90dp"
android:gravity="center"
android:horizontalSpacing="10dp"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:verticalSpacing="10dp" >
</GridView>
提前致谢..
答案 0 :(得分：1)
好的，我发现了这个bug，你已经在两个地方定义了pictureList变量，在适配器类中初始化的是一个局部变量。调用checkResult时，它使用属于主活动类的pictureList变量。执行以下操作：
1）删除适配器类中的局部变量。 2）初始化已在活动类中定义的pictureList变量。
这可以解决错误。它现在在我的机器上工作正常！
此外，您使用的逻辑存在很多问题，一旦修复此错误，您就会意识到。