我需要向 ListView 添加背景图像。通常我会调用 listview.setBackground(myImage)
。但是图像来自服务器,所以我需要使用 Picasso 将图像加载到我的 ListView 的背景中。我该怎么做?
最佳答案
选项一
定义com.squareup.picasso.Target
的匿名子类
Picasso.with(yourContext)
.load(yourImageUri)
.into(new Target() {
@Override
@TargetApi(16)
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
yourListView.setBackgroundDrawable(new BitmapDrawable(bitmap));
} else {
yourListView.setBackground(new BitmapDrawable(getResources(), bitmap));
}
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
// use error drawable if desired
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
// use placeholder drawable if desired
}
});
选项二
子类 ListView
并实现 com.squareup.picasso.Target
public class PicassoListView extends ListView implements Target {
public PicassoListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PicassoListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
@TargetApi(16)
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
setBackgroundDrawable(new BitmapDrawable(bitmap));
} else {
setBackground(new BitmapDrawable(getResources(), bitmap));
}
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
// use error drawable if desired
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
// use placeholder drawable if desired
}
}
这让你可以这样做:
Picasso.with(yourContext)
.load(yourImageUri)
.into(yourListView);
关于android - 使用 Picasso 将背景图片添加到 Android ListView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26207716/