我的墙纸管理器使用异步任务设置为墙纸。但是从非异步更改为 AsyncTask 后，我收到错误“SetWallpaperTask 类型的方法 getBaseContext() 未定义”请更正我的代码。非常感谢。
旧的非异步任务
public void SetWallpaper(String image_url)
{
URL myFileUrl = null;
try
{
myFileUrl = new URL(image_url);
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
Bitmap bmImg = null;
try {
HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();
conn.setDoInput(true);
conn.connect();
//int length = conn.getContentLength();
InputStream is = conn.getInputStream();
bmImg = BitmapFactory.decodeStream(is);
}
catch (IOException e)
{
e.printStackTrace();
}
try {
String path = myFileUrl.getPath();
String idStr = path.substring(path.lastIndexOf('/') + 1);
File filepath = Environment.getExternalStorageDirectory();
File dir = new File (filepath.getAbsolutePath() + "/Wallpaper/");
dir.mkdirs();
String fileName = idStr;
File file = new File(dir, fileName);
FileOutputStream fos = new FileOutputStream(file);
bmImg.compress(CompressFormat.JPEG, 75, fos);
fos.flush();
fos.close();
WallpaperManager wpm = WallpaperManager.getInstance(getBaseContext());
wpm.setBitmap(bmImg);
}
catch (Exception e){
e.printStackTrace();
}
}
新的异步任务
public class SetWallpaperTask extends AsyncTask<String , String , String>
{
private Context context;
private ProgressDialog pDialog;
String image_url;
URL myFileUrl;
String myFileUrl1;
Bitmap bmImg = null;
public SetWallpaperTask(Context context) {
this.context = context;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pDialog = new ProgressDialog(context);
pDialog.setMessage("Downloading Image ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
try {
myFileUrl = new URL(args[0]);
//myFileUrl1 = args[0];
HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bmImg = BitmapFactory.decodeStream(is);
}
catch (IOException e)
{
e.printStackTrace();
}
try {
String path = myFileUrl.getPath();
String idStr = path.substring(path.lastIndexOf('/') + 1);
File filepath = Environment.getExternalStorageDirectory();
File dir = new File (filepath.getAbsolutePath() + "/Wallpaper/");
dir.mkdirs();
String fileName = idStr;
File file = new File(dir, fileName);
FileOutputStream fos = new FileOutputStream(file);
bmImg.compress(CompressFormat.JPEG, 75, fos);
fos.flush();
fos.close();
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String args) {
// TODO Auto-generated method stub
WallpaperManager wpm = WallpaperManager.getInstance(context()); // --The method context() is undefined for the type SetWallpaperTask
wpm.setBitmap(bmImg);
pDialog.dismiss();
}
}