//调用系统相册-选择图片  

   private static final int IMAGE = 1;

//调用相册  写方法写在你你的头像点击事件

               Intent intent = new Intent(Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(intent, IMAGE);

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //获取图片路径
        if (requestCode == IMAGE && resultCode == Activity.RESULT_OK && data != null) {
            Uri selectedImage = data.getData();
            String[] filePathColumns = {MediaStore.Images.Media.DATA};
            Cursor c = getContentResolver().query(selectedImage, filePathColumns, null, null, null);
            c.moveToFirst();
            int columnIndex = c.getColumnIndex(filePathColumns[0]);
            String imagePath = c.getString(columnIndex);
            Log.i("=====","图片"+imagePath);
            showImage(imagePath);
            c.close();
        }
    }

      //加载图片
    private void showImage(String imaePath){
         Bitmap bm = BitmapFactory.decodeFile(imaePath);
         imgHead.setImageBitmap(bm);