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android RecyclerView不像过去的ListView那样随意的设置水平方向的分割线,如果要实现RecyclerView的水平/垂直分割线,则需要继承自RecyclerView.ItemDecoration重写getItemOffsets方法,从而增加水平/垂直分割线。
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写一个例子。
MainActivity.Java:
package zhangphil.app; import android.content.Context; import android.graphics.Color; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.StaggeredGridLayoutManager; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView); // 两列 int spanCount = 2; // StaggeredGridLayoutManager管理RecyclerView的布局。 StaggeredGridLayoutManager mLayoutManager = new StaggeredGridLayoutManager(spanCount, StaggeredGridLayoutManager.VERTICAL); mRecyclerView.setLayoutManager(mLayoutManager); //为RecyclerView增加分割线,水平和垂直方向都有。增加分割线值比如为32。 RecyclerViewItemDecoration decoration = new RecyclerViewItemDecoration(32); mRecyclerView.addItemDecoration(decoration); RecyclerViewAdapter mAdapter = new RecyclerViewAdapter(this); mRecyclerView.setAdapter(mAdapter); } private class ItemViewHolder extends RecyclerView.ViewHolder { private TextView text; public ItemViewHolder(View itemView) { super(itemView); text = (TextView) itemView.findViewById(android.R.id.text1); text.setTextColor(Color.WHITE); } } public class RecyclerViewAdapter extends RecyclerView.Adapter{ private Context context; public RecyclerViewAdapter(Context context) { super(); this.context = context; } @Override public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { View view = View.inflate(context, android.R.layout.simple_list_item_1, null); view.setBackgroundColor(Color.RED); ItemViewHolder holder = new ItemViewHolder(view); return holder; } @Override public void onBindViewHolder(ItemViewHolder viewHolder, int pos) { viewHolder.text.setText(String.valueOf(pos)); } @Override public int getItemCount() { return 15; } } }
布局文件,很简单,就放一个RecyclerView,注意背景颜色的设置:
<?xml version="1.0" encoding="utf-8"?>
最关键的RecyclerViewItemDecoration.java:
package zhangphil.app; /** * Created by Phil on 2016/10/8. */ import android.graphics.Rect; import android.support.v7.widget.RecyclerView; import android.view.View; /** * 为RecyclerView增加间距 * 预设2列,如果是3列,则左右值不同 */ public class RecyclerViewItemDecoration extends RecyclerView.ItemDecoration { private int space = 0; private int pos; public RecyclerViewItemDecoration(int space) { this.space = space; } @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { outRect.top = space; //该View在整个RecyclerView中位置。 pos = parent.getChildAdapterPosition(view); //取模 //两列的左边一列 if (pos % 2 == 0) { outRect.left = space; outRect.right = space / 2; } //两列的右边一列 if (pos % 2 == 1) { outRect.left = space / 2; outRect.right = space; } } }
代码运行结果:
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