我是android studio的新手。我想制作壁纸应用程序,其中使用gridView中的图像url从互联网加载图像。为此,我创建activity_common使用网格中的网格加载图像查看
activty_common.xml
<GridView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="100dp"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:numColumns="2"
android:gravity="center"
android:stretchMode="columnWidth"
android:id="@+id/gridView" />
custom_layout
<ImageView
android:id="@+id/sample"
android:layout_width="100dp"
android:layout_height="100dp"
android:background="@drawable/lion"/>
然后创建Gridadapter
public class Gridadapter extends BaseAdapter {
private Context mContext;
public String mThumbIds[];
public Gridadapter(Context c) {
mContext = c;
}
@Override
public int getCount() {
return mThumbIds.length;
}
@Override
public String getItem(int position) {
return mThumbIds[position];
}
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(480, 480));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
String url = getItem(position);
Picasso.with(mContext)
.load(url)
.centerCrop().into(imageView);
return imageView;
}}
然后创建Java类名为食品
public class Food extends Activity {
public String[] mThumbIds = {
" https://www.pexels.com/photo/daylight-environment-fog-forest-539945/",
"https://www.pexels.com/photo/daylight-environment-fog-forest-539945/"
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activtiy_common);
GridView gridView = (GridView) findViewById(R.id.gridView);
// Instance of ImageAdapter Class
gridView.setAdapter(new Gridadapter(this, mThumbIds));
}
}
我觉得gridadapter允许Integer []; 我如何传递String []; 我加入互联网premissiona和毕加索库
当运行应用程序它给了我
错误:(28,29)错误:构造Gridadapter类Gridadapter不能应用于给定类型; 要求:上下文 发现:食物的String []
原因:实际的和正式的参数列表的长度不同提前
感谢
误差仅在Food.java –