求助！GrigView的使用问题

Question

最近刚开始学安卓开发，看的麦子学院的UI视频，其中GridView一节--在定义的BaseAdapter的子类中的GetView中有一句
View menuView = LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_view,null);（43行）
其中的parent.getContext()找不到，我使用的AS3.1版本。
MainActivity程序如下：
public class MainActivity extends AppCompatActivity {    List<MenuItem> dataList;    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);        GridView gridView = findViewById(R.id.my_grid_view);
        dataList = new ArrayList<>();
        dataList.add(new MenuItem("鸟",R.drawable.bird));
        dataList.add(new MenuItem("立秋",R.drawable.li_qiu));
        dataList.add(new MenuItem("箭头",R.drawable.jiantou_left));
        dataList.add(new MenuItem("路飞",R.drawable.lu_fei));
        dataList.add(new MenuItem("男性",R.drawable.male));
        dataList.add(new MenuItem("太阳",R.drawable.sun));        MenuGrideAdapter menuGrideAdapter = new MenuGrideAdapter();
        gridView.setAdapter(menuGrideAdapter);
    }    class MenuGrideAdapter extends BaseAdapter{        @Override
        public int getCount() {
            return dataList.size();
        }        @Override
        public Object getItem(int i) {
            return dataList.get(i);
        }        @Override
        public long getItemId(int i) {
            return i;
        }        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {            View menuView = LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_view,null);            TextView menuName = findViewById(R.id.my_grid_view_text);
            menuName.setText(dataList.get(i).menuName);            ImageView menuImage = findViewById(R.id.my_grid_view_image);
            menuImage.setImageResource(dataList.get(i).menuDrawanleId);            return menuView;
        }
    }    class MenuItem{
        String menuName;
        int menuDrawanleId;        MenuItem(String menuName,int menuDrawanleId){
            this.menuName = menuName;
            this.menuDrawanleId = menuDrawanleId;
        }
    }
}

Answer 1

你把parent换成viewGroup

Answer 2

activity定义一个Context变量,将当前环境赋值给他,然后这个位置传入你定义的context

Answer 3

先定义一个 Context context;
然后在Oncreate()里面 context=MainActivity.this;
再把parent.getContext()替换成context

Answer 4

一、建议添加构造函数，传入你要显示的list和当前activity.this。
二、可以传入全局MainActivity.this就可以，你这个parent都没有定义。
三、getCount和getItem最好先判断一下dataList为空不。

Answer 5

用Context定义了MainActivity还是不行，显示
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference。
请问是什么原因？

Answer 6

明显你的imageview为null啊,说明你前面ImageView menuImage = findViewById(R.id.my_grid_view_image);就没获取到对应的控件
要写成ImageView menuImage = menuView.findViewById(R.id.my_grid_view_image);

Answer 7

明显你的imageview为null啊,说明你前面ImageView menuImage = findViewById(R.id.my_grid_view_image);就没获取到对应的控件
要写成ImageView menuImage = menuView.findViewById(R.id.my_grid_view_image);改了之后又有新的错误。。
08-08 14:07:29.330 8303-8303/com.valder.time.ui_text07 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.valder.time.ui_text07, PID: 8303
    java.lang.RuntimeException: Canvas: trying to draw too large(196000000bytes) bitmap.
        at android.view.DisplayListCanvas.throwIfCannotDraw(DisplayListCanvas.java:260)
        at android.graphics.Canvas.drawBitmap(Canvas.java:1415)
        at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:545)
        at android.widget.ImageView.onDraw(ImageView.java:1286)
        at android.view.View.draw(View.java:17071)
        at android.view.View.updateDisplayListIfDirty(View.java:16053)
        at android.view.View.draw(View.java:16837)
        at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
        at android.view.View.updateDisplayListIfDirty(View.java:16048)
        at android.view.View.draw(View.java:16837)
        at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
        at android.widget.AbsListView.dispatchDraw(AbsListView.java:2635)
        at android.view.View.draw(View.java:17074)
        at android.widget.AbsListView.draw(AbsListView.java:4298)
        at android.view.View.updateDisplayListIfDirty(View.java:16053)
        at android.view.View.draw(View.java:16837)
        at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
        at android.view.View.updateDisplayListIfDirty(View.java:16048)
        at android.view.View.draw(View.java:16837)
        at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
        at android.view.View.updateDisplayListIfDirty(View.java:16048)
        at android.view.View.draw(View.java:16837)
        at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
        at android.view.View.updateDisplayListIfDirty(View.java:16048)
        at android.view.View.draw(View.java:16837)
        at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
        at android.view.View.updateDisplayListIfDirty(View.java:16048)
        at android.view.View.draw(View.java:16837)
        at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
        at android.view.View.updateDisplayListIfDirty(View.java:16048)
        at android.view.View.draw(View.java:16837)
        at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
        at android.view.View.draw(View.java:17074)
        at com.android.internal.policy.DecorView.draw(DecorView.java:751)
        at android.view.View.updateDisplayListIfDirty(View.java:16053)
        at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:656)
        at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:662)
        at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:770)
        at android.view.ViewRootImpl.draw(ViewRootImpl.java:2796)
        at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2604)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2211)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1246)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6301)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
        at android.view.Choreographer.doCallbacks(Choreographer.java:683)
        at android.view.Choreographer.doFrame(Choreographer.java:619)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6077)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

Answer 8

图片太大 你这得是张什么图  180多M 要么压缩图片，或者改分辨率，放到对应的dpi目录里面

Answer 9

你用eclipse自带的图片试试

Answer 10

关于gridview和加载图片列表的demo可以github上面找找