给出实现RecycleView Gallery的代码
时间: 2024-03-14 11:44:36 浏览: 27
好的,下面是一个简单的实现自定义RecycleView Gallery的示例代码。这个示例代码使用了自定义的LayoutManager和自定义的View来实现画廊效果。
首先,我们创建一个自定义的LayoutManager,名为GalleryLayoutManager:
```java
public class GalleryLayoutManager extends LinearLayoutManager {
private float mScale = 0.8f; // 缩放比例
public GalleryLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
@Override
public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) {
int scrolled = super.scrollHorizontallyBy(dx, recycler, state);
float midpoint = getWidth() / 2.0f;
float d0 = 0.0f;
float d1 = mScale;
float s0 = 1.0f;
float s1 = mScale;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
float childMidpoint = (getDecoratedRight(child) + getDecoratedLeft(child)) / 2.0f;
float d = Math.min(d1, Math.abs(midpoint - childMidpoint) / getWidth());
float scale = s0 + (s1 - s0) * (1.0f - d);
child.setScaleX(scale);
child.setScaleY(scale);
}
return scrolled;
}
}
```
这个LayoutManager会在RecyclerView中创建一个水平滚动的画廊效果,并且会根据RecyclerView的滚动位置来动态调整每个子项的缩放比例,实现画廊效果。
然后,我们创建一个自定义的View,名为GalleryItemView:
```java
public class GalleryItemView extends FrameLayout {
private ImageView mImageView;
public GalleryItemView(Context context) {
super(context);
init();
}
public GalleryItemView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public GalleryItemView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
LayoutInflater.from(getContext()).inflate(R.layout.view_gallery_item, this, true);
mImageView = findViewById(R.id.image);
}
public void setImage(int resId) {
mImageView.setImageResource(resId);
}
}
```
这个View会在RecyclerView中的每个子项中显示一个图片,并且会根据LayoutManager的要求来动态调整自己的缩放比例。
最后,我们创建一个RecyclerView,并设置它的LayoutManager和Adapter:
```java
public class GalleryActivity extends AppCompatActivity {
private static final int[] IMAGES = {
R.drawable.image1,
R.drawable.image2,
R.drawable.image3,
R.drawable.image4,
R.drawable.image5,
R.drawable.image6,
R.drawable.image7,
R.drawable.image8,
R.drawable.image9,
R.drawable.image10,
};
private RecyclerView mRecyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gallery);
mRecyclerView = findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new GalleryLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
mRecyclerView.setAdapter(new Adapter());
}
private class Adapter extends RecyclerView.Adapter<ViewHolder> {
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
GalleryItemView itemView = new GalleryItemView(parent.getContext());
itemView.setLayoutParams(new RecyclerView.LayoutParams(300, 300));
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
((GalleryItemView) holder.itemView).setImage(IMAGES[position % IMAGES.length]);
}
@Override
public int getItemCount() {
return 100;
}
}
private static class ViewHolder extends RecyclerView.ViewHolder {
public ViewHolder(View itemView) {
super(itemView);
}
}
}
```
这个示例代码会在RecyclerView中显示100个随机的图片,并且会以画廊的形式展示出来。
希望这个示例代码能够对你有所帮助!