更新并删除在运行时的GridView项目 [英] Update and remove GridView items at runtime
问题描述
我正在开发一个项目,我比较两个项目的形象,所以,如果点击这些项目应该是隐藏后两个项目都会有相同的图像。我的code下面给出这code遇到问题。这是一个逻辑上的错误或其他问题?我试图解决这个问题,但我以前不解决。请指引我......这是我的主要活动。结果
MainActivity.java
公共类MainActivity延伸活动{
上下文CTX;
INT imagesArray [];
ImageAdapter适配器;
清单<整数GT;图片;
布尔flage = FALSE;
GridView控件GridView控件;
INT保存1,保存2;
INT IMG1 = -1,IMG2 = -1;
公众诠释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}; @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
最终的ImageView MYIMAGE =新ImageView的(CTX);
GridView控件=(GridView控件)findViewById(R.id.gv_memory);
gridView.setAdapter(适配器);
shuffleArray(); gridView.setOnItemClickListener(新OnItemClickListener(){ @覆盖
公共无效onItemClick(适配器视图<>为arg0,ARG1查看,
INT位置,长ARG3){
// TODO自动生成方法存根
myimage.setImageResource(pictures.get(位置)); 如果(flage == FALSE){ IMG1 = pictures.get(位置);
flage = TRUE; }否则如果(flage ==真){ IMG2 = pictures.get(位置); checkResult(); flage = FALSE;
}
}
私人无效checkResult(){
// TODO自动生成方法存根 如果(IMG1 == IMG2){
adapter.pictureList.remove(IMG1);
adapter.pictureList.remove(IMG2);
adapter.notifyDataSetChanged();
Toast.makeText(MainActivity.thisCongratualatin !!!!
Toast.LENGTH_LONG).show();
}其他{
Toast.makeText(MainActivity.this,对不起!!!!
Toast.LENGTH_LONG).show(); }
}
});
} 私人无效shuffleArray(){
// TODO自动生成方法存根
照片=新的ArrayList<整数GT;();
对于(INT指数= 0;指数 - LT; OriginalArray.length;指数++){
pictures.add(OriginalArray [指数]);
}
Collections.shuffle(照片); }
}
ImageAdapter.java
公共类ImageAdapter延伸BaseAdapter { 私人上下文的背景下;
清单<整数GT; pictureList =新的ArrayList<整数GT;(); 公共ImageAdapter(上下文C){
上下文= C;
的for(int i = 0; I< 8;我++){
pictureList.add(R.drawable.question);
}
} @覆盖
公众诠释的getCount(){
// TODO自动生成方法存根
返回(pictureList.size());
} @覆盖
公共对象的getItem(INT位置){
// TODO自动生成方法存根
返回pictureList.get(位置);
} @覆盖
众长getItemId(INT位置){
// TODO自动生成方法存根
返回的位置;
}
@覆盖
公共查看getView(INT位置,查看convertView,父母的ViewGroup){
// TODO自动生成方法存根
ImageView的MYIMAGE =新ImageView的(上下文);
myimage.setImageResource(pictureList.get(位置));
myimage.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
myimage.setLayoutParams(新GridView.LayoutParams(70,70));
返回MYIMAGE;
}}
LogCat中。
6月3日至十四日:09:03.793:D / dalvikvm(2877):GC_FOR_ALLOC释放54K,8%的免费2771K / 2996K,暂停111ms,117ms总
6月3日至十四日:09:03.802:I / dalvikvm堆(2877):成长堆(frag的情况下),以3.943MB为1127536字节分配
6月3日至十四日:09:03.922:D / dalvikvm(2877):GC_FOR_ALLOC释放2K,6%免费3870K / 4100K,暂停118ms,118ms总
6月3日至十四日:09:03.962:D / AndroidRuntime(2877):关闭VM
6月3日至十四日:09:03.962:W / dalvikvm(2877):主题ID = 1:螺纹未捕获的异常(组= 0x41465700)退出
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):致命异常:主要
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):了java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.memory / com.example.memory.MainActivity}:显示java.lang.NullPointerException
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.app.ActivityThread.access $ 600(ActivityThread.java:141)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1256)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.os.Handler.dispatchMessage(Handler.java:99)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.os.Looper.loop(Looper.java:137)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.app.ActivityThread.main(ActivityThread.java:5103)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在java.lang.reflect.Method.invokeNative(本机方法)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在java.lang.reflect.Method.invoke(Method.java:525)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:737)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在dalvik.system.NativeStart.main(本机方法)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):因:显示java.lang.NullPointerException
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.view.ViewConfiguration.get(ViewConfiguration.java:318)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.view.View<&初始化GT;(View.java:3264)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.widget.ImageView<&初始化GT;(ImageView.java:112)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在com.example.memory.MainActivity.onCreate(MainActivity.java:33)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.app.Activity.performCreate(Activity.java:5133)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
6月3日至十四日:09:03.972:E / AndroidRuntime(2877):11 ...更多
6月3日至十四日:14:04.503:I /流程(2877):发送信号。 PID:2877 SIG:9
您
最后的ImageView MYIMAGE =新ImageView的(CTX);
CTZ
未初始化。它唯一的声明为上下文CTX
;
您有这
gridView.setAdapter(适配器);
但你需要并初始化适配器
使用相同的前
所以改为
的setContentView(R.layout.main);
最终的ImageView MYIMAGE =新ImageView的(本); //这是指活动范围内
GridView控件=(GridView控件)findViewById(R.id.gv_memory);
适配器=新ImageAdapter(本)
gridView.setAdapter(适配器);
i am developing a project where i compare the images of two items,So if two items will have same image after clicking these items should be hide. my code is given below and this code encounter a problem. is this a logical error or any other issue? i try to solve the issue but did't resolve.. Please guide me... here is my main Activity.
MainActivity.java
public class MainActivity extends Activity {
Context ctx;
int imagesArray[];
ImageAdapter adapter;
List<Integer> pictures;
boolean flage = false;
GridView gridView;
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);
final ImageView myimage = new ImageView(ctx);
gridView = (GridView) findViewById(R.id.gv_memory);
gridView.setAdapter(adapter);
shuffleArray();
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
// TODO Auto-generated method stub
myimage.setImageResource(pictures.get(position));
if (flage == false) {
img1 = pictures.get(position);
flage = true;
} else if (flage == true) {
img2 = pictures.get(position);
checkResult();
flage = false;
}
}
private void checkResult() {
// TODO Auto-generated method stub
if (img1 == img2) {
adapter.pictureList.remove(img1);
adapter.pictureList.remove(img2);
adapter.notifyDataSetChanged();
Toast.makeText(MainActivity.this, "Congratualatin !!!!",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this, "Sorry!!!!",
Toast.LENGTH_LONG).show();
}
}
});
}
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);
}
}
ImageAdapter.java
public class ImageAdapter extends BaseAdapter {
private Context context;
List<Integer> pictureList = new ArrayList<Integer>();
public ImageAdapter(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(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ImageView myimage = new ImageView(context);
myimage.setImageResource(pictureList.get(position));
myimage.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
myimage.setLayoutParams(new GridView.LayoutParams(70, 70));
return myimage;
}
}
LogCat.
03-14 06:09:03.793: D/dalvikvm(2877): GC_FOR_ALLOC freed 54K, 8% free 2771K/2996K, paused 111ms, total 117ms
03-14 06:09:03.802: I/dalvikvm-heap(2877): Grow heap (frag case) to 3.943MB for 1127536-byte allocation
03-14 06:09:03.922: D/dalvikvm(2877): GC_FOR_ALLOC freed 2K, 6% free 3870K/4100K, paused 118ms, total 118ms
03-14 06:09:03.962: D/AndroidRuntime(2877): Shutting down VM
03-14 06:09:03.962: W/dalvikvm(2877): threadid=1: thread exiting with uncaught exception (group=0x41465700)
03-14 06:09:03.972: E/AndroidRuntime(2877): FATAL EXCEPTION: main
03-14 06:09:03.972: E/AndroidRuntime(2877): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.memory/com.example.memory.MainActivity}: java.lang.NullPointerException
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.os.Handler.dispatchMessage(Handler.java:99)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.os.Looper.loop(Looper.java:137)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.app.ActivityThread.main(ActivityThread.java:5103)
03-14 06:09:03.972: E/AndroidRuntime(2877): at java.lang.reflect.Method.invokeNative(Native Method)
03-14 06:09:03.972: E/AndroidRuntime(2877): at java.lang.reflect.Method.invoke(Method.java:525)
03-14 06:09:03.972: E/AndroidRuntime(2877): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
03-14 06:09:03.972: E/AndroidRuntime(2877): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-14 06:09:03.972: E/AndroidRuntime(2877): at dalvik.system.NativeStart.main(Native Method)
03-14 06:09:03.972: E/AndroidRuntime(2877): Caused by: java.lang.NullPointerException
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.view.ViewConfiguration.get(ViewConfiguration.java:318)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.view.View.<init>(View.java:3264)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.widget.ImageView.<init>(ImageView.java:112)
03-14 06:09:03.972: E/AndroidRuntime(2877): at com.example.memory.MainActivity.onCreate(MainActivity.java:33)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.app.Activity.performCreate(Activity.java:5133)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-14 06:09:03.972: E/AndroidRuntime(2877): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
03-14 06:09:03.972: E/AndroidRuntime(2877): ... 11 more
03-14 06:14:04.503: I/Process(2877): Sending signal. PID: 2877 SIG: 9
You have
final ImageView myimage = new ImageView(ctx);
ctz
is not initialized. Its only declared as Context ctx
;
You have this
gridView.setAdapter(adapter);
But you need to intialize adapter
before using the same
So change to
setContentView(R.layout.main);
final ImageView myimage = new ImageView(this); //this refers to Activity context
gridView = (GridView) findViewById(R.id.gv_memory);
adapter = new ImageAdapter(this)
gridView.setAdapter(adapter);
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