case R.id.bt5:
Intent it4 =new Intent(Intent.ACTION_VIEW);
File file1=new File("/内部存储/DCIM/Camera/IMG_20150613_103420.jpg");
it4.setDataAndType(Uri.fromFile(file1),"image/*");
startActivity(it4);
break;
case R.id.bt6:
Intent it5 =new Intent(Intent.ACTION_VIEW);
File file2=new File("/内部存储/DCIM/Camera/VID_20150703_195112.mp4");
it5.setDataAndType(Uri.fromFile(file2),"video/*");
startActivity(it5);
break;
只是建议不要有中文,
有没有影响你换个没中文的试试就知道了