我試圖顯示圖像的網格視圖。我嘗試了下面的代碼,但我的應用程序在運行後得到強制關閉。在哪裏出錯了? 我的代碼:如何顯示圖像的網格視圖?
AndroidGridLayoutActivity:
public class AndroidGridLayoutActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView gv=(GridView)findViewById(R.id.grid_view);
gv.setAdapter(new ImageAdapter(this));
}
}
ImageAdapter.java:
public class ImageAdapter extends BaseAdapter {
private Context mcontext;
public Integer[] mThumbids={R.drawable.img9,R.drawable.img10,R.drawable.img11,R.drawable.img12,R.drawable.img13,R.drawable.img14};
public ImageAdapter(Context c)
{
mcontext=c;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mThumbids.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return mThumbids[position];
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ImageView imageView=new ImageView(mcontext);
imageView.setImageResource(mThumbids[position]);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(70,70));
return imageView;
}
}
的main.xml:
<GridView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/grid_view"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:columnWidth="90dp"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:stretchMode="columnWidth"/>
* logcat的*嗎? –
07-03 11:43:03.601錯誤/ AndroidRuntime(2184):致命異常:主 07-03 11:43:03.601:錯誤/ AndroidRuntime(2184):java.lang.RuntimeException:無法啓動活動ComponentInfo { com.infy/com.infy.AndroidGridLayoutActivity}:java.lang.NullPointerException 07-03 11:43:03.601:ERROR/AndroidRuntime(2184):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) – user2523879
07 -03 11:43:03.601:錯誤/ AndroidRuntime(2184):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 07-03 11:43:03.601:錯誤/ AndroidRuntime(2184):在android。 app.ActivityThread.access $ 2300(ActivityThread.java:125) 07-03 11:43:03.601:ERROR/AndroidRuntime(2184):at android.app.ActivityThread $ H.handleMessage(ActivityThread.java:2033) 07- 03 11:43:03.601:ERR OR/AndroidRuntime(2184):at android.os.Handler.dispatchMessage(Handler.java:99) – user2523879