是用來替代ListView和Gallery的
可以實現列表和九宮格的橫向和縱向的滑動以及瀑布流效果
要想使用就要添加v7包的支持
需要聯合使用Adapter和ViewHolder和LayoutManager
縱向和橫向滑動效果的實現
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.hanhan.myapplication.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="wrap_content"></android.support.v7.widget.RecyclerView>
</LinearLayout>
public class MainActivity extends AppCompatActivity {
/**
* rv相關聯的類:
* 1.布局管理器,用來設置rv的顯示風格,如列表,網格,瀑布流,XXXLayoutManager
* 2.適配器,Adapter
* 3.ViewHolder
*/
@BindView(R.id.rv)
RecyclerView mRv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
//1.設置布局管理器
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);//這個就是實現橫向滑動
mRv.setLayoutManager(linearLayoutManager);
//2.設置適配器
mRv.setAdapter(new MyRvAdapter());
}
private class MyRvAdapter extends RecyclerView.Adapter {
//創建ViewHolder
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, parent, false);
return new MyRvViewHolder(view);
}
//對ViewHolder里面的控件進行賦值
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
MyRvViewHolder myRvViewHolder = (MyRvViewHolder) holder;
myRvViewHolder.setData(position);
}
//RV的條目數量
@Override
public int getItemCount() {
return 50;
}
}
private class MyRvViewHolder extends RecyclerView.ViewHolder {
private TextView mTextView;
private int position;
public MyRvViewHolder(View itemView) {
super(itemView);
mTextView = itemView.findViewById(R.id.tv_test);
}
public void setData(int position) {
this.position = position;
mTextView.setText("哈哈哈哈哈" + position);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:background="#f00"
android:orientation="vertical">
<!--條目的布局-->
<TextView
android:id="@+id/tv_test"
android:layout_width="match_parent"
android:layout_height="40dp"
android:gravity="center"
android:text="hello"/>
</LinearLayout>