第一行代码笔记 RecycleView使用

compile 'com.android.support:recyclerview-v7:23.0.0'

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.lvyequeen.test.day01.recyclerView.RecyclerActivity">

<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/recycle"
/>
</RelativeLayout>

<?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="match_parent"
android:orientation="vertical">

<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/ic_launcher" />

<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/app_name" />
</LinearLayout>

public class MyData {
private String discreble;
private int image;

public MyData(String discreble, int image) {
this.discreble = discreble;
this.image = image;
}

public String getDiscreble() {
return discreble;
}

public void setDiscreble(String discreble) {
this.discreble = discreble;
}

public int getImage() {
return image;
}

public void setImage(int image) {
this.image = image;
}

@Override
public String toString() {
return "MyDate{" +
"discreble='" + discreble + '\'' +
", image=" + image +
'}';
}
}

public class RecycleViewAdapter extends RecyclerView.Adapter<RecycleViewAdapter.ViewHolder> {

//    定义数据源
private List<MyData> mData;

/**
* 通过构造方法，在这里将数据源传入
*
* @param mData
*/
public RecycleViewAdapter(List<MyData> mData) {
this.mData = mData;
}

/**
* 设置子itemview的布局,同时设置点击事件
*
* @param parent
* @param viewType
* @return
*/
@Override
public ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycle_layout, parent, false);
final ViewHolder viewHolder = new ViewHolder(view);
//        点击最最外层子view
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = viewHolder.getAdapterPosition();
MyData myData = mData.get(position);
Toast.makeText(parent.getContext(),"click:"+myData.getDiscreble(),Toast.LENGTH_SHORT).show();
}
});
//        点击图标
viewHolder.imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = viewHolder.getAdapterPosition();
MyData myData = mData.get(position);
Toast.makeText(parent.getContext(),"click Image:"+myData.getDiscreble(),Toast.LENGTH_SHORT).show();

}
});

return viewHolder;
}

/**
* 将数据和控件绑定
*
* @param holder
* @param position
*/
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
MyData myDate = mData.get(position);
holder.imageView.setImageResource(myDate.getImage());
holder.textView.setText(myDate.getDiscreble());

}

/**
* 返回多长的item
*
* @return
*/
@Override
public int getItemCount() {
return mData.size();
}

/**
* 定义内部类，实例化item的每一个view
* 同时保存最外层的item布局实例
*/
static class ViewHolder extends RecyclerView.ViewHolder {
View itemView;
ImageView imageView;
TextView textView;

public ViewHolder(View itemView) {
super(itemView);
this.itemView = itemView;//保存子项最外层布局的实例
imageView = (ImageView) itemView.findViewById(R.id.image);
textView = (TextView) itemView.findViewById(R.id.text);
}
}
}

public class RecyclerActivity extends AppCompatActivity {

private RecyclerView recycle;
private List<MyData> mydatas = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recycler);
initData();//初始化数据源
initView();
}

private void initView() {
recycle = ((RecyclerView) findViewById(R.id.recycle));
//      LinearLayoutManager使用线性布局，实现的是listview类似的效果。
//      LinearLayoutManager manager = new LinearLayoutManager(this);
//      默认为纵向排列，通过 manager.setOrientation 可以设置横向滚动。
//      manager.setOrientation(LinearLayoutManager.HORIZONTAL);
//       设置样式为网格布局 参数1为上下文，参数而为列数
//        GridLayoutManager manager = new GridLayoutManager(this, 4);
//        设置瀑布流布局 参数1为列数，参数二为排布方式
StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);

recycle.setLayoutManager(manager);
RecycleViewAdapter adapter = new RecycleViewAdapter(mydatas);
recycle.setAdapter(adapter);

}

/**
* 伪造数据源
*/
private void initData() {
MyData mydate = new MyData("a", R.mipmap.a);
mydatas.add(mydate);
MyData mydate1 = new MyData("a1******************", R.mipmap.a1);
mydatas.add(mydate1);
MyData mydate2 = new MyData("a2@@@@@@@@@@@@", R.mipmap.a2);
mydatas.add(mydate2);
MyData mydate3 = new MyData("a3#######", R.mipmap.a3);
mydatas.add(mydate3);
MyData mydate4 = new MyData("a4$$$", R.mipmap.a4);
mydatas.add(mydate4);
MyData mydate5 = new MyData("a5", R.mipmap.a5);
mydatas.add(mydate5);
MyData mydate6 = new MyData("a6^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^", R.mipmap.a6);
mydatas.add(mydate6);
MyData mydate7 = new MyData("a7&&&&&&&&", R.mipmap.a7);
mydatas.add(mydate7);
MyData mydate8 = new MyData("a8****************************", R.mipmap.a8);
mydatas.add(mydate8);

}
}