三星s5报错。 #1

Process: com.example.mjj.selectphotodemo, PID: 10497
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
at com.example.mjj.selectphotodemo.utils.ImageLoader.cacheBitmap2Disk(ImageLoader.java:315)
at com.example.mjj.selectphotodemo.utils.ImageLoader.access$1300(ImageLoader.java:32)
at com.example.mjj.selectphotodemo.utils.ImageLoader$DiskCacheThread.run(ImageLoader.java:286)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)