Android三種緩存策略分別是什么

這里寫一些實(shí)際比較實(shí)用的緩存技術(shù)，有待驗(yàn)證哦，請想用的童鞋試試再說哈！

3.提交url,交給程序去判斷是否下載。

public class ImagecachetacticsdemoActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.item);
/*FMU*/
p_w_picpathCacheManager = ImageCacheManager.getImageCacheService(this,
ImageCacheManager.MODE_FIXED_MEMORY_USED, "memory");
p_w_picpathCacheManager.setMax_Memory(1024 * 1024);
/*FTU*/
// p_w_picpathCacheManager = ImageCacheManager.getImageCacheService(this,
// ImageCacheManager.MODE_FIXED_TIMED_USED, "time");
// p_w_picpathCacheManager.setDelay_millisecond(3 * 60 * 1000);
/*LRU*/
// p_w_picpathCacheManager = ImageCacheManager.getImageCacheService(this,
// ImageCacheManager.MODE_LEAST_RECENTLY_USED, "num");
// p_w_picpathCacheManager.setMax_num(5);
// p_w_picpathCacheManager = ImageCacheManager.getImageCacheService(this,
// ImageCacheManager.MODE_NO_CACHE_USED, "nocache");
mImageView = (ImageView) findViewById(R.id.p_w_picpathView);
new DownloadTask()
.execute("http://www.touxiang99.com/uploads/allimg/110417/1_110417112640_2.jpg");
}
private class DownloadTask extends AsyncTask<String, Void, Bitmap> {
@Override
protected Bitmap doInString...  params) {
try {
return p_w_picpathCacheManager.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 p_w_picpathCacheManager;
}