Gridview的Alertdialog（Imageadpater）

活动代码：

public void iconSelector(View view) {
    CoordinatorLayout coordinatorLayout = (CoordinatorLayout) findViewById(R.id.create_coordinator);
    LayoutInflater inflater = getLayoutInflater();
    View dialogView = inflater.inflate(R.layout.item_icon_grid_layout, coordinatorLayout, false);


    GridView gridView = (GridView) dialogView.findViewById(R.id.itemIconGridLayout);
    database = new Database(this);
    mId = database.getLastIdOD();
    if(mId>=1) {
        iconList = database.getIconList();

    }
    database.close();
    gridView.setAdapter(new IconsAdapter(getApplicationContext(),iconList));
    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
            mIcon = iconList.get(position).getName();
        }
    });

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setView(dialogView);
    builder.setTitle(R.string.iconChoose);
    mIconSelectorDialog= builder.show();
}

IconsAdapter中的代码：

public class IconsAdapter extends BaseAdapter {
  private Context mContext;
List<Icon> iconList;

public IconsAdapter(Context context,List<Icon> list ){
    mContext = context;
    iconList = list;
    int d = iconList.size();
    String i= ""+d;
    Log.d("MyLogIconAdapter",iconList.get(0).getName());
    Log.d("MyLog",i);
}

public int getCount() {
    return iconList.size();

}

public Object getItem(int position) {
    return iconList.get(position).getId();
}

public long getItemId(int position) {
    return position;
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub

    View grid;
    LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if (convertView == null) {
        grid = new View(mContext);
        grid = inflater.inflate(R.layout.item_icon_grid,null);
        ImageView imageView = (ImageView) grid.findViewById(R.id.imageItemIconGrid);
        int iconResId = mContext.getResources().getIdentifier(iconList.get(position).getName(), "drawable", mContext.getPackageName());
        imageView.setImageResource(iconResId);
    } else {
        grid = (View) convertView;
    }


    return grid;
}

}

Item_icon_grid：

<ImageView
    android:id="@+id/imageItemIconGrid"
    android:src="@drawable/ic_drafts_white_24dp"
    android:layout_width="18dp"
    android:layout_height="18dp"
    android:layout_gravity="center" />

item_icon_grid_layout：

<GridView
    android:id="@+id/itemIconGridLayout"
    android:numColumns="auto_fit"
    android:background="#ffffff"
    android:verticalSpacing="5dp"
    android:horizontalSpacing="5dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</GridView>

日志：

FATAL EXCEPTION：main进程：com.universe.time.officereminder，PID：25213 java.lang.NullPointerException：尝试在com的空对象引用上调用虚方法'void android.widget.ImageView.setImageResource（int）' . 在Android.widget.GridView.onMeasure（GridView.java:1064）的android.widget.AbsListView.obtainView（AbsListView.java:2828）上的universe.time.proffesionaldiary.adapters.IconsAdapter.getView（IconsAdapter.java:60） .view.View.measure（View.java:18647）位于Android.widget.LinearLayout上android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1435）的android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5832） . 在android.view.measure.View.measure（View.java:18647）上的android.widget.Linear.onMeasure（LinearLayout.java:612）上的measureVertical（LinearLayout.java:721）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java） ：5832）在android.widget.FrameLayout.onMeasure（FrameLayout.java:430）的android.view.View.measure（View.java:18647）atro位于android.view.measure.View.View的android.view.vision.measure（View.java:18647）上的android.widget.FrameLayout.onMeasure（FrameLayout.java:430）中的id.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5832） .measureChildWithMargins（ViewGroup.java:5832）位于android.widget.Lineout.ayMay上的android.widget.Lineout.measureChildBayfore.Yalout.measureTerfore.measureVertical（LinearLayout.java：721）上的android.widget.Lineout.anMeasure（LinearLayout.java:1432） java：612）在android.view.measure.View.measure（View.java:18647）的android.view.visionGroup.measureChildWithMargins（ViewGroup.java:5832）在android.widget.FrameLayout.onMeasure（FrameLayout.java:430）at android.sview.View.measure（View.java:18647）android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5832）android的android.support.v7.widget.ContentFrameLayout.onMeasure（ContentFrameLayout.java:135） .widget.FrameLayout.onMeasure（FrameLayout.java:430）在android.view.vision.measure（View.java:18647）的android.view.ViewGroup.measureChildWithMargins（Vie） wGroup.java:5832）在android.view.measure.View.measure（View.java:18647）的android.widget.FrameLayout.onMeasure（FrameLayout.java:430）android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5832） ）android.widget.LineoutLayout.measureChildBayforeLayout.Tay上的Android.widget.LinearLayout.measureChildBayfore.Layout.RatsoutLayout.Yal中的android.widget.Lineout.measureVertical（LinearLayout.java:721）安卓android.widget.Line .View.measure（View.java:18647）在android.view.visionGroup.measureChildWithMargins（ViewGroup.java:5832）的android.widget.FrameLayout.onMeasure（FrameLayout.java:430）com.android.internal.policy . 在android.view.View.measure上调查android.view.View上的android.view.View中的android.view.View（ . View.java:2298）中的impl.PhoneWindow $ DecorView.onMeasure（PhoneWindow.java:3012） android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1230）上android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1588）的.measureHierarchy（ViewRootImpl.java:1320）在Android.view.Chore上的android.view.Chore（（Choreographer.java：570）中，在android.view.Choreographer $ CallbackRecord.run（Choreographer.java：777）的android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:6748） android.view.H.中的android.view.Handler.handleCallback（Handler.java:739）android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:763）的android.view.Choreographer.doFrame（Choreographer.java:560） .Handler.dispatchMessage（Handler.java:95）位于android.app.Looper.loop（Looper.java:145）的android.app.ActivityThread.main（ActivityThread.java:6126），位于java.lang.reflect.Method . 在com.android.internal的com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1399）的java.lang.reflect.Method.invoke（Method.java:372）中调用（Native Method） . os.ZygoteInit.main（ZygoteInit.java:1194）