我想設置一個圖像(從互聯網下載)作爲我的相對佈局的背景透明屬性。使用通用圖像加載器設置RelativeLayout的下載圖像的背景
下面是我在我的layout.xml文件中有什麼:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:id="@+id/mainLayout"
android:alpha="0.75" >
....
</RelativeLayout>
這就是我想從活動要做到:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initializeImageLoader();
String imageUri = "http://www.laederach.com/fileadmin/img/filialen/zermatt/zermattBg.jpg";
Bitmap bitmap = imageLoader.loadImageSync(imageUri1);
relativeLayout = (RelativeLayout)findViewById(R.id.mainLayout);
Drawable d =new BitmapDrawable(getResources(),bitmap);
relativeLayout.setBackground(new BitmapDrawable(bitmap));
}
private void initializeImageLoader() {
// Create global configuration and initialize ImageLoader with this configuration
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext())
.build();
ImageLoader.getInstance().init(config);
}
但它無法正常工作。任何想法爲什麼這不工作或我失蹤?謝謝。