Android : 瀑布流
阿新 • • 發佈:2018-12-04
效果
實現程式碼
需要的jar包
com.android.support:recyclerview-v7:28.0.0
com.android.support:cardview-v7:28.0.0
activitymain的xml程式碼
<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp" android:padding="4dp" app:cardBackgroundColor="#ffffffff" app:cardCornerRadius="15dp" tools:context=".MainActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/MyRec" android:layout_width="match_parent" android:layout_height="match_parent"></android.support.v7.widget.RecyclerView> </android.support.v7.widget.CardView>
bean包類
package com.bwie.administrator.pubuliu.bean; public class MyData { /** * 名字 */ private String name; /** * 圖片id */ private int imageId; public MyData(String name, int imageId) { this.name = name; this.imageId = imageId; } public String getName() { return name; } public int getImageId() { return imageId; } }
介面卡的xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#88ffffff"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_horizontal" android:orientation="vertical"> <ImageView android:id="@+id/MyImg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:scaleType="centerCrop" /> <TextView android:id="@+id/MyName" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> </RelativeLayout>
介面卡
package com.bwie.administrator.pubuliu.adapter;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.bwie.administrator.pubuliu.R;
import com.bwie.administrator.pubuliu.bean.MyData;
import java.util.ArrayList;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private Context context;
private ArrayList<MyData> datas;
public MyAdapter(Context context, ArrayList<MyData> datas) {
this.context = context;
this.datas = datas;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
//載入佈局檔案
View v = View.inflate(context, R.layout.item, null);
ViewHolder holder = new ViewHolder(v);
return holder;
}
@Override
public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
//對holder賦值
MyData myData = datas.get(i);
viewHolder.MyImg.setImageResource(myData.getImageId());
viewHolder.MyName.setText(myData.getName());
}
@Override
public int getItemCount() {
return datas.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
private ImageView MyImg;
private TextView MyName;
public ViewHolder(@NonNull View itemView) {
super(itemView);
MyImg = itemView.findViewById(R.id.MyImg);
MyName = itemView.findViewById(R.id.MyName);
}
}
}
activity的程式碼
package com.bwie.administrator.pubuliu;
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 com.bwie.administrator.pubuliu.adapter.MyAdapter;
import com.bwie.administrator.pubuliu.bean.MyData;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private ArrayList<MyData> datas = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.MyRec);
//使用瀑布流 第一個引數為列數 第二個引數為排列方向
StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(manager);
//初始化資料
initData();
//設定介面卡
MyAdapter adapter = new MyAdapter(this,datas);
recyclerView.setAdapter(adapter);
}
private void initData() {
MyData myData;
//進行for迴圈新增資料
for (int i = 0; i < 20; i++) {
myData = new MyData("美女", R.drawable.a);
datas.add(myData);
myData = new MyData("美女", R.drawable.b);
datas.add(myData);
myData = new MyData("美女", R.drawable.c);
datas.add(myData);
myData = new MyData("美女", R.drawable.d);
datas.add(myData);
}
}
}
以上