Constrained layout flow

Flow Fluid layout

There are many ways to implement streaming layout , such as RecycleView Of StaggeredGridLayoutManager, perhaps Customize the dynamic calculation method of layout etc. , No matter which implementation , Are all behind ConstraintLayout Provided Flow Fluid layout More flexible , It's simpler .

base_component_learn/ConstraintFlowActivity.java at master · buder-cp/base_component_learn · GitHub

Here we add dynamically , The effect is as follows ：

  The code is very simple , That is, you can use dynamic add layout ：

import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.helper.widget.Flow;
import androidx.constraintlayout.widget.ConstraintLayout;
import java.util.ArrayList;

public class ConstraintFlowActivity extends AppCompatActivity {

    private ConstraintLayout mainLayout;
    private Flow flow;
    private int[] idsss = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
    private String[] strings = new String[]{ " It's amazing how dark the silver man is... How dark the silver man is ", " Freely flowing style of writing ", " tearful ", " Good words ",
            " Frost ", " Cuitong, cuitong ", " beam with joy ", " Maggie ", " Rong ", " Words describing friendship ",
            " A collection of beautiful words ", " smile into each other 's eyes ", " Smile ", " Esteem, ", " look very happy ", " Charming ", " The darkness at ", " Day and night, day and night ", " It wins, ", "ads"};
    private ArrayList<Integer> arrayList = new ArrayList<Integer>();

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.constraint_exercise);
        mainLayout = (ConstraintLayout) LayoutInflater.from(this).inflate(R.layout.constraint_exercise, null);
        setContentView(mainLayout);
        for (int i = 1; i < 20; i++) {
            arrayList.add(i);
            mainLayout.addView(generateView(i));
        }
        flow = findViewById(R.id.constrain_flows);
//        flow.setMaxElementsWrap(3);
//        flow.setHorizontalAlign();
        flow.setWrapMode(1);
        flow.setReferencedIds(idsss);
    }

    private TextView generateView(int i) {
        TextView textView = new TextView(getApplicationContext());
        textView.setId(i);
        textView.setPadding(12, 5, 12, 5);
        textView.setTextColor(Color.BLACK);
        textView.setBackgroundResource(R.drawable.vip_course_selector_bg);
        textView.setText(strings[i]);
        return textView;
    }
}

XML The code contains only one flow that will do ：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.constraintlayout.helper.widget.Flow
        android:id="@+id/constrain_flows"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginTop="20dp"
        app:layout_constraintTop_toTopOf="parent"
        app:flow_horizontalGap="10dp"
        app:flow_verticalGap="10dp"
        app:flow_maxElementsWrap="4"
        app:flow_wrapMode="aligned" />

</androidx.constraintlayout.widget.ConstraintLayout>

Write in native code flow Is streaming layout very simple .

Specifically Flow You can see some specific properties of ConstraintLayout 2.0 Analysis of new features （ One ）--Flow Fluid layout - Simple books

The core is to use attributes ：app:constraint_referenced_ids take 7 individual ImageView Restrain yourself .

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.constraintlayout.helper.widget.Flow
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:flow_horizontalGap="10dp"
        app:flow_verticalGap="10dp"
        app:flow_wrapMode="none"
        app:constraint_referenced_ids="image1,image2,image3,image4,image5,image6,image7" />

    <ImageView
        android:id="@+id/image1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <ImageView
        android:id="@+id/image2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <ImageView
        android:id="@+id/image3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <ImageView
        android:id="@+id/image4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <ImageView
        android:id="@+id/image5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <ImageView
        android:id="@+id/image6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <ImageView
        android:id="@+id/image7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

</androidx.constraintlayout.widget.ConstraintLayout>