Load bitmap from file Android

public static Bitmap loadFromFile(String filename) {      try {          File f = new File(filename);          if (!f.exists()) { return null; }          Bitmap tmp = BitmapFactory.decodeFile(filename);          return tmp;      } catch (Exception e) {          return null;      }  }

import java.io.File;import java.io.FileOutputStream;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Bitmap.CompressFormat;import android.os.Environment;class PictUtil {  public static File getSavePath() {      File path;      if (hasSDCard()) { // SD card          path = new File(getSDCardPath() + "/Tegaky/");          path.mkdir();      } else {           path = Environment.getDataDirectory();      }      return path;  }  public static String getCacheFilename() {      File f = getSavePath();      return f.getAbsolutePath() + "/cache.png";  }  public static Bitmap loadFromFile(String filename) {      try {          File f = new File(filename);          if (!f.exists()) { return null; }          Bitmap tmp = BitmapFactory.decodeFile(filename);          return tmp;      } catch (Exception e) {          return null;      }  }  public static Bitmap loadFromCacheFile() {      return loadFromFile(getCacheFilename());  }  public static void saveToCacheFile(Bitmap bmp) {      saveToFile(getCacheFilename(),bmp);  }  public static void saveToFile(String filename,Bitmap bmp) {      try {          FileOutputStream out = new FileOutputStream(filename);          bmp.compress(CompressFormat.PNG, 100, out);          out.flush();          out.close();      } catch(Exception e) {}  }  public static boolean hasSDCard() { // SD????????      String status = Environment.getExternalStorageState();      return status.equals(Environment.MEDIA_MOUNTED);  }  public static String getSDCardPath() {      File path = Environment.getExternalStorageDirectory();      return path.getAbsolutePath();  }}

Now question comes,about the "Bitmap tmp = BitmapFactory.decodeFile(filename);",no matter how I modify it ,the result tmp is always null!
the main point is options,the options should be specifid,indicate the format of the image.So it should be like this:

BitmapFactory.Options opts = new Options();opts.inPreferredConfig = Config.RGB_565;tmp=BitmapFactory.decodeFile(bitmapPath,opts);

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