Android 开发笔记___FrameLayout

xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

     <Button
         android:id="@+id/btn_add_frame"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:gravity="center"
         android:text="给下方的框架布局添加视图"
         android:textColor="#000000"
         android:textSize="17sp" />

     <FrameLayout
         android:id="@+id/fl_content"
         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>

java

 package com.example.alimjan.hello_world;

 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Color;
 import android.os.Bundle;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.widget.FrameLayout;
 import android.widget.LinearLayout;

 /**
  * Created by alimjan on 7/2/2017.
  */

 public class class_3_1_2 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.code_3_1_2);

         fl_content = (FrameLayout) findViewById(R.id.fl_content);
         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(
                     ActionBar.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);
         }
     }

     public static void startHome(Context mContext) {
         Intent intent = new Intent(mContext, class_3_1_2.class);
         mContext.startActivity(intent);
     }

 }