动态添加一个视图及其布局属性（要掌握）

<?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);
}
}
}