开源项目地址:https://github.com/open-android/DynamicGridView

运行效果

使用步骤

1. 在project的build.gradle添加如下代码(如下图)

allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }
    }
}

2. 在Module的build.gradle添加依赖

compile 'com.github.open-android:DynamicGridView:0.1.0'

3. 复制如下代码到xml

<org.askerov.dynamicgrid.DynamicGridView
      android:id="@+id/dynamic_grid"
      android:layout_height="wrap_content"
      android:layout_width="match_parent"
      android:numColumns="@integer/column_count"      
/>

4. 复制如下代码到Activity

gridView = (DynamicGridView) findViewById(R.id.dynamic_grid);
// 第一个参数：上下文
// 第二个参数：adapter展示需要用到的集合数据
// 第三个参数：gridview一共有多少列
gridView.setAdapter(new MyDynamicGridAdapter(this, itemsList, 3));
gridView.setOnDragListener(new DynamicGridView.OnDragListener() {
        @Override
        public void onDragStarted(int position) {
            Log.d(TAG, "drag started at position " + position);
        }

        @Override
        public void onDragPositionsChanged(int oldPosition, int newPosition) {
            Log.d(TAG, String.format("drag item position changed from %d to %d", oldPosition, newPosition));
        }
    });
    gridView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
            gridView.startEditMode(position);
            return true;
        }
    });

    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(GridActivity.this, parent.getAdapter().getItem(position).toString(),
                    Toast.LENGTH_SHORT).show();
        }
    });
   
   @Override
   public void onBackPressed() {

        if (gridView.isEditMode()) {
            gridView.stopEditMode();
        } else {
            super.onBackPressed();
            //进行数据持久化操作
        }
  }

细节注意：

当前开源项目只实现了拖拽特效,拖拽完成退出应用之后并没有实现数据持久化功能,如需要进行数据的持久化,需要监听返回按钮在else方法实现数据持久化操作。

5. 复制如下代码到Adapter

public class CheeseDynamicAdapter extends BaseDynamicGridAdapter {
public CheeseDynamicAdapter(Context context, List<?> items, int columnCount) {
    super(context, items, columnCount);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    CheeseViewHolder holder;
    if (convertView == null) {
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_grid, null);
        holder = new CheeseViewHolder(convertView);
        convertView.setTag(holder);
    } else {
        holder = (CheeseViewHolder) convertView.getTag();
    }
    holder.build(getItem(position).toString());
    return convertView;
}

private class CheeseViewHolder {
    private TextView titleText;
    private ImageView image;

    private CheeseViewHolder(View view) {
        titleText = (TextView) view.findViewById(R.id.item_title);
        image = (ImageView) view.findViewById(R.id.item_img);
    }

    void build(String title) {
        titleText.setText(title);
        image.setImageResource(R.mipmap.ic_launcher);
    }
}

}

细节注意：

必须继承BaseDynamicGridAdapter。

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