动态添加一个视图及其布局属性（要掌握）

Posted 2020-10-03 挣脱生命的束缚...

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    tools:context="com.admin.myapplication30.FrameActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/btn_add_frame"
            android:gravity="center"
            android:text="添加视图"
            android:textColor="#000000"
            android:textSize="17sp"/>

        <FrameLayout
            android:id="@+id/fl_frame"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:foreground="@mipmap/ic_launcher"
            android:foregroundGravity="top|center_horizontal">
        </FrameLayout>

    </LinearLayout>

</android.support.constraint.ConstraintLayout>

package com.admin.myapplication30;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.LinearLayout;

public class FrameActivity extends AppCompatActivity implements View.OnClickListener {
    private FrameLayout fl_content;
    private int[] mColorArray = {
            Color.BLACK, Color.WHITE, Color.RED, Color.YELLOW, Color.GREEN,
            Color.BLUE, Color.CYAN, Color.MAGENTA, Color.GRAY, Color.DKGRAY
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_frame);

        fl_content = (FrameLayout) findViewById(R.id.fl_frame);
        findViewById(R.id.btn_add_frame).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.btn_add_frame) {
            int random = (int) (Math.random()*10 % 10);
            View vv = new View(this);
            vv.setBackgroundColor(mColorArray[random]);
            LinearLayout.LayoutParams ll_params = new LinearLayout.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT, (random+1)*50);
            vv.setLayoutParams(ll_params);
            vv.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View vvv) {
                    fl_content.removeView(vvv);
                    return true;
                }
            });
            fl_content.addView(vv);
        }
    }
}