image.png
StaggeredGridLayoutManager(瀑布流布局效果),是配合RecyclerView使用的。
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteX="299dp"
tools:layout_editor_absoluteY="370dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java:
package com.exmple.staggeredgridlayoutmanagertest;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;
import android.os.Bundle;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
RecyclerView mRecyclerView;
StaggeredGridLayoutManager mLayoutManager;
ItemAdapter mAdapter;
ArrayList<String> items = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
int spanCount = 5;
mLayoutManager = new StaggeredGridLayoutManager(
spanCount,
StaggeredGridLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLayoutManager);
for (int i = 0; i < 100; i++) {
items.add("hello:" + i);
}
mAdapter = new ItemAdapter(items);
mRecyclerView.setAdapter(mAdapter);
}
}
ItemAdapter.java:
package com.exmple.staggeredgridlayoutmanagertest;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.viewHolder> {
private ArrayList<String> items = new ArrayList<>();
public ItemAdapter(ArrayList<String> items) {
this.items = items;
}
@Override
public viewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_card,
viewGroup, false);
return new viewHolder(view);
}
@Override
public int getItemViewType(int position) {
return super.getItemViewType(position);
}
@Override
public void onBindViewHolder(viewHolder viewHolder, int position) {
String info = items.get(position);
View view = viewHolder.itemView;
TextView textView = (TextView) view.findViewById(R.id.info_text);
textView.setText(info);
//手动更改高度,不同位置的高度有所不同
textView.setHeight(100 + (position % 3) * 30);
}
@Override
public int getItemCount() {
return items.size();
}
class viewHolder extends RecyclerView.ViewHolder {
public viewHolder(View itemView) {
super(itemView);
}
}
}
item_card.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="100dp"
android:layout_height="100dp">
<androidx.cardview.widget.CardView
android:layout_width="50dp"
android:layout_height="50dp"
card_view:cardBackgroundColor="@color/purple_200">
<TextView
android:id="@+id/info_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
</androidx.cardview.widget.CardView>
</LinearLayout>
执行效果:
image.png