weex☞打开本地相册

获取通讯录、扫码、打开相册、拍照等操作，都是一个套路，就是创建module，原生实现这些方法，前端调用是时候返回最终的结果。
下面是如何打开本地相册，并获取照片路径。

public class PickImageModule extends WXModule {

    public static final int REQUEST_CODE = 10010;
    public final static int CAMERA_REQUEST_CODE= 1;

    protected JSCallback callback;
    
    @JSMethod(uiThread = true)
    public void choosePhoto(JSCallback callback) {
        if (ContextCompat.checkSelfPermission(mWXSDKInstance.getContext(),
                Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions((WXPageActivity) mWXSDKInstance.getContext(),
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    CAMERA_REQUEST_CODE);
        } else { 
            choosePhoto();
        }
        this.callback = callback;
    }

    private void choosePhoto() {
        Intent intentToPickPic = new Intent(Intent.ACTION_PICK, null);   intentToPickPic.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/jpeg");
        ((Activity) (mWXSDKInstance.getContext())).startActivityForResult(intentToPickPic, GALLERY_REQUEST_CODE);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == WXPageActivity.RESULT_OK) {
            switch (requestCode) {
                case GALLERY_REQUEST_CODE: {
                    try {
                        Uri selectedImage = data.getData();
                        String[] filePathColumns = {MediaStore.Images.Media.DATA};
                        Cursor c = mWXSDKInstance.getContext().getContentResolver().query(selectedImage, filePathColumns, null, null, null);
                        c.moveToFirst();
                        int columnIndex = c.getColumnIndex(filePathColumns[0]);
                        String picturePath = c.getString(columnIndex);
                        c.close();
                        callback.invoke(picturePath);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    break;
                }
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

}

配置相应的权限，在WXApplication中加入

   WXSDKEngine.registerModule("pickPhoto", PickImageModule.class);

然后就是前端调用

const pickPhoto = weex.requireModule('pickPhoto')
...         //在方法中直接使用就行了
            pickPhoto .choosePhoto(res => {
                   ...
                })