打开系统相册

首先在清单文件中添加权限，无论是拍照还是从相册中选择图片都涉及到用户的隐私，所以我们需要声明权限，需要在清单文件中加入这句：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

代码：

    private ImageView imgShow = null;
    private TextView imgPath = null;
    private final int IMAGE_CODE = 0;
    private final String IMAGE_TYPE = "image/*";

  private void selectImage() {
    // 判断api是否大于19（Android 4.4）
        boolean isKitKatO = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
        Intent intent;
        if (isKitKatO) {
            Log.e("Tag","ACTION_OPEN_DOCUMENT");

//           此方法获取不到图片路径
//            intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);

            // 6.0以上使用，获取图片路径
            intent=new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        } else {
            Log.e("Tag","ACTION_GET_CONTENT");
            intent = new Intent(Intent.ACTION_GET_CONTENT);
        }
        intent.setType(IMAGE_TYPE);

        startActivityForResult(intent, IMAGE_CODE);
    }


    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.e("Tag","走了 onActivityResult");
        if (resultCode == RESULT_OK) {
            Bitmap bm = null;
            ContentResolver resolver = getContentResolver();
            if (requestCode == IMAGE_CODE) {
                try {
                    Uri uri = data.getData();
                    Log.e("Tag","Uri==="+uri);

                    //bm = MediaStore.Images.Media.getBitmap(resolver, uri);
                    //显得到bitmap图片
                    //imgShow.setImageBitmap(bm);

//                  用Gilide加载uri
                    Glide.with(this).load(uri).into(imgShow);

                    String[] proj = {MediaStore.Images.Media.DATA};
                    Cursor cursor = getContentResolver().query(uri, proj, null, null, null);
                    if(cursor.moveToFirst()) {
                        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                        Log.e("Tag","column_index==="+column_index);
                        // 获取到图片路径
                        String path = cursor.getString(column_index);
                        Log.e("Tag","path==="+path);
                        imgPath.setText(path);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    Log.e("Tag","Exception==="+e);
                }
            }
        }
    }