android应用图片缓存解决方法

public class ImagecachetacticsdemoActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.item);

/*FMU*/
imageCacheManager = ImageCacheManager.getImageCacheService(this,
ImageCacheManager.MODE_FIXED_MEMORY_USED, "memory");
imageCacheManager.setMax_Memory(1024 * 1024);

/*FTU*/
// imageCacheManager = ImageCacheManager.getImageCacheService(this,
// ImageCacheManager.MODE_FIXED_TIMED_USED, "time");
// imageCacheManager.setDelay_millisecond(3 * 60 * 1000);

/*LRU*/
// imageCacheManager = ImageCacheManager.getImageCacheService(this,
// ImageCacheManager.MODE_LEAST_RECENTLY_USED, "num");
// imageCacheManager.setMax_num(5);

// imageCacheManager = ImageCacheManager.getImageCacheService(this,
// ImageCacheManager.MODE_NO_CACHE_USED, "nocache");

mImageView = (ImageView) findViewById(R.id.imageView);
new DownloadTask()
.execute("http://www.touxiang99.com/uploads/allimg/110417/1_110417112640_2.jpg");
}

private class DownloadTask extends AsyncTask {

@Override
protected Bitmap doInBackground(String... params) {
try {
return imageCacheManager.downlaodImage(new URL(params[0]));
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

@Override
protected void onPostExecute(Bitmap result) {

mImageView.setImageBitmap(result);
super.onPostExecute(result);
}

@Override
protected void onPreExecute() {
mImageView.setImageResource(R.drawable.ic_launcher);
super.onPreExecute();
}

}

private ImageView mImageView;
private ImageCacheManager imageCacheManager;

}