Android 开发笔记___FrameLayout

Posted 2020-09-26 alm

xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:layout_width="match_parent"
 3     android:layout_height="match_parent"
 4     android:orientation="vertical" >
 5 
 6     <Button
 7         android:id="@+id/btn_add_frame"
 8         android:layout_width="match_parent"
 9         android:layout_height="wrap_content"
10         android:gravity="center"
11         android:text="给下方的框架布局添加视图"
12         android:textColor="#000000"
13         android:textSize="17sp" />
14 
15     <FrameLayout
16         android:id="@+id/fl_content"
17         android:layout_width="match_parent"
18         android:layout_height="0dp"
19         android:layout_weight="1"
20         android:foreground="@mipmap/ic_launcher"
21         android:foregroundGravity="top|center_horizontal" >
22     </FrameLayout>
23 
24 </LinearLayout>

java

 1 package com.example.alimjan.hello_world;
 2 
 3 import android.content.Context;
 4 import android.content.Intent;
 5 import android.graphics.Color;
 6 import android.os.Bundle;
 7 import android.support.v7.app.ActionBar;
 8 import android.support.v7.app.AppCompatActivity;
 9 import android.view.View;
10 import android.widget.FrameLayout;
11 import android.widget.LinearLayout;
12 
13 /**
14  * Created by alimjan on 7/2/2017.
15  */
16 
17 
18 public class class_3_1_2 extends AppCompatActivity implements View.OnClickListener {
19 
20     private FrameLayout fl_content;
21     private int[] mColorArray = {
22             Color.BLACK, Color.WHITE, Color.RED, Color.YELLOW, Color.GREEN,
23             Color.BLUE, Color.CYAN, Color.MAGENTA, Color.GRAY, Color.DKGRAY
24     };
25 
26     @Override
27     protected void onCreate(Bundle savedInstanceState) {
28         super.onCreate(savedInstanceState);
29         setContentView(R.layout.code_3_1_2);
30 
31         fl_content = (FrameLayout) findViewById(R.id.fl_content);
32         findViewById(R.id.btn_add_frame).setOnClickListener(this);
33     }
34 
35     @Override
36     public void onClick(View v) {
37         if (v.getId() == R.id.btn_add_frame) {
38             int random = (int) (Math.random()*10 % 10);
39             View vv = new View(this);
40             vv.setBackgroundColor(mColorArray[random]);
41             LinearLayout.LayoutParams ll_params = new LinearLayout.LayoutParams(
42                     ActionBar.LayoutParams.MATCH_PARENT, (random+1)*50);
43             vv.setLayoutParams(ll_params);
44             vv.setOnLongClickListener(new View.OnLongClickListener() {
45                 @Override
46                 public boolean onLongClick(View vvv) {
47                     fl_content.removeView(vvv);
48                     return true;
49                 }
50             });
51             fl_content.addView(vv);
52         }
53     }
54 
55     public static void startHome(Context mContext) {
56         Intent intent = new Intent(mContext, class_3_1_2.class);
57         mContext.startActivity(intent);
58     }
59 
60 }