Question

首先，我很抱歉我的问题名称。现在我说你有什么问题。我有一个片段，有一个imageView和2个按钮（上一个和下一个）。所以在那个imageView我添加了第一张图片来自画廊。然后点击下一步我想看到画廊的下一张图片。我已经获得的图像路径。

让我告诉你代码。

public class PhotoFragment extends BaseFragment{
View mainView;
private ImageView photoView;
private Button prev, next;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    mainView = inflater.inflate(R.layout.photo_fragment, container, false);

    photoView = (ImageView) mainView.findViewById(R.id.photoView);
    prev = (Button) mainView.findViewById(R.id.prevPhoto);
    next = (Button) mainView.findViewById(R.id.nextPhoto);

    getAllShownImagesPath(getActivity());
    return mainView;
}

ArrayList<String> getAllShownImagesPath(Activity activity) {
    Uri uri;
    Cursor cursor;
    int column_index_data;
    final ArrayList<String> listOfAllImages = new ArrayList<>();
    String absolutePathOfImage;
    uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

    String[] projection = {MediaStore.MediaColumns.DATA,
            MediaStore.Images.Media.BUCKET_DISPLAY_NAME};

    cursor = activity.getContentResolver().query(uri, projection, null,
            null, null);

    column_index_data = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
    while (cursor.moveToNext()) {
        absolutePathOfImage = cursor.getString(column_index_data);
        listOfAllImages.add(absolutePathOfImage);
    }

    Bitmap myBitmap = BitmapFactory.decodeFile(listOfAllImages.get(0));
    photoView.setImageBitmap(myBitmap);
    photoView.setRotation(90);


    Bitmap myBitmap1 = BitmapFactory.decodeFile(listOfAllImages.get(1));
    Bitmap myBitmap2 = BitmapFactory.decodeFile(listOfAllImages.get(2));
    Bitmap myBitmap3 = BitmapFactory.decodeFile(listOfAllImages.get(3));
    Bitmap myBitmap4 = BitmapFactory.decodeFile(listOfAllImages.get(4));
    Bitmap myBitmap5 = BitmapFactory.decodeFile(listOfAllImages.get(5));
    Bitmap myBitmap6 = BitmapFactory.decodeFile(listOfAllImages.get(6));

    final ArrayList<Bitmap> bitmap = new ArrayList<>();
    bitmap.add(myBitmap);
    bitmap.add(myBitmap1);
    bitmap.add(myBitmap2);
    bitmap.add(myBitmap3);
    bitmap.add(myBitmap4);
    bitmap.add(myBitmap5);
    bitmap.add(myBitmap6);


    prev.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

        }
    });

    next.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

        }
    });

    cursor.close();
    return listOfAllImages;
}

你在这里看到我正在获取第一张图片并在imageView中设置它。

Bitmap myBitmap = BitmapFactory.decodeFile(listOfAllImages.get(0));
    photoView.setImageBitmap(myBitmap);

但我不能做滑动部分。我怎样才能做到这一点？感谢。

Answer 1

function testX(x){
  return x ? x : 1;
}

// Truthy:
console.log(testX(10));           // 10
console.log(testX({}));           // {}
console.log(testX(true));         // true
console.log(testX("something"));  // "something"

// Falsy:
console.log(testX(""));     // 1
console.log(testX());       // 1
console.log(testX(4-"Z"));  // 1 because 4-"Z" == NaN
console.log(testX(false));  // 1
console.log(testX(0));      // 1
console.log(testX(null));   // 1

如何将图片从图库设置为滑块

1 个答案: