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  • 写程序的欢迎界面（运用画图方法画圆球）。

     1 package com.lixu.drawable;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.Window;
 6 import android.view.WindowManager;
 7 import untils.Untils;
 8 
 9 public class MainActivity extends Activity {
10     private Activity activity;
11 
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         activity = this;
16         // 设置全屏
17         requestWindowFeature(Window.FEATURE_NO_TITLE);
18         Untils.toggleFullscreen(activity, true);
19         setContentView(R.layout.main);
20 
21     }
22 
23 }
      1 package com.lixu.drawable;
  2 
  3 import android.app.Activity;
  4 import android.content.Intent;
  5 import android.os.Bundle;
  6 import android.support.v4.app.Fragment;
  7 import android.support.v4.app.FragmentActivity;
  8 import android.support.v4.app.FragmentManager;
  9 import android.support.v4.app.FragmentPagerAdapter;
 10 import android.support.v4.view.ViewPager;
 11 import android.support.v4.view.ViewPager.OnPageChangeListener;
 12 import android.view.LayoutInflater;
 13 import android.view.View;
 14 import android.view.View.OnClickListener;
 15 import android.view.ViewGroup;
 16 import android.view.Window;
 17 import android.widget.Button;
 18 import android.widget.ImageView;
 19 import untils.Untils;
 20 
 21 public class WelcomActivity extends FragmentActivity {
 22     private Mydrawable mMydrawable;
 23     private Activity activity;
 24 
 25     private int[] images = { R.drawable.p1, R.drawable.p2, R.drawable.p3, R.drawable.p4, R.drawable.p5,
 26             R.drawable.p6, };
 27 
 28     @SuppressWarnings("deprecation")
 29     @Override
 30     protected void onCreate(Bundle savedInstanceState) {
 31         activity = this;
 32         super.onCreate(savedInstanceState);
 33         // 让程序全屏
 34         requestWindowFeature(Window.FEATURE_NO_TITLE);
 35         Untils.toggleFullscreen(activity, true);
 36 
 37         setContentView(R.layout.activity_main);
 38 
 39         mMydrawable = (Mydrawable) findViewById(R.id.mydrawable);
 40         // 根据情况设置圆球数量
 41         mMydrawable.setCount(images.length);
 42 
 43         ViewPager vp = (ViewPager) findViewById(R.id.vp);
 44 
 45         vp.setAdapter(new MyAdapter(this.getSupportFragmentManager()));
 46 
 47         vp.setOnPageChangeListener(new OnPageChangeListener() {
 48             // 设置页面滑动时改变红点的位置
 49             @Override
 50             public void onPageSelected(int pos) {
 51 
 52                 mMydrawable.choose(pos);
 53 
 54             }
 55 
 56             @Override
 57             public void onPageScrolled(int arg0, float arg1, int arg2) {
 58 
 59             }
 60 
 61             @Override
 62             public void onPageScrollStateChanged(int arg0) {
 63 
 64             }
 65         });
 66 
 67     }
 68 
 69     private class MyAdapter extends FragmentPagerAdapter {
 70 
 71         public MyAdapter(FragmentManager fm) {
 72             super(fm);
 73         }
 74 
 75         @Override
 76         public Fragment getItem(final int pos) {
 77 
 78             Fragment f = new Fragment() {
 79                 @Override
 80                 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 81 
 82                     if (pos == (getCount() - 1)) {
 83 
 84                         View view = inflater.inflate(R.layout.fragmentmain, null);
 85                         Button btn = (Button) view.findViewById(R.id.btn);
 86                         btn.setOnClickListener(new OnClickListener() {
 87 
 88                             @Override
 89                             public void onClick(View v) {
 90                                 Intent intent = new Intent(activity, MainActivity.class);
 91                                 startActivity(intent);
 92                                 // 进入主程序关闭初始动画界面
 93                                 activity.finish();
 94                             }
 95                         });
 96                         ImageView iv = (ImageView) view.findViewById(R.id.iv2);
 97                         iv.setImageResource(images[pos]);
 98                         return view;
 99 
100                     } else {
101                         View view = inflater.inflate(R.layout.fragment, null);
102 
103                         ImageView iv = (ImageView) view.findViewById(R.id.iv1);
104                         iv.setImageResource(images[pos]);
105 
106                         return view;
107 
108                     }
109                 }
110             };
111 
112             return f;
113         }
114 
115         @Override
116         public int getCount() {
117             return images.length;
118         }
119 
120     }
121 
122 }
     1 package com.lixu.drawable;
 2 
 3 import android.content.Context;
 4 import android.graphics.Canvas;
 5 import android.graphics.Color;
 6 import android.graphics.Paint;
 7 import android.util.AttributeSet;
 8 import android.util.Log;
 9 import android.view.View;
10 
11 public class Mydrawable extends View {
12     private int posfirst = 0;
13     // 圆球的间距
14     private int juli = 50;
15     // 圆球的数量
16     private int count = 0;
17 
18     // 设置圆球的半径
19     private float radius = 10;
20 
21     // 用这个构造方法,用其他会报错
22     public Mydrawable(Context context, AttributeSet attrs) {
23         super(context, attrs);
24     }
25 
26     // 根据情况设置圆球数量
27     public void setCount(int a) {
28         count = a;
29     }
30 
31     public void choose(int pos) {
32         posfirst = pos;
33         // 执行这个方法 会重新绘图
34         this.invalidate();
35     }
36 
37     @Override
38     protected void onDraw(Canvas canvas) {
39         super.onDraw(canvas);
40 
41         Paint p = new Paint();
42         // 去掉图形的锯齿，使得圆球更圆滑
43         p.setAntiAlias(true);
44 
45         // 获取屏幕X Y坐标
46         float w = getWidth();
47         float h = getHeight();
48 
49         for (int i = 0; i < 6; i++) {
50             if (i == posfirst) {
51 
52                 p.setColor(Color.RED);
53                 // 画一个红色圆形
54                 canvas.drawCircle((w - (count - 1) * juli) / 2 + juli * i, (float) (h * 0.9), radius + 5, p);
55             } else {
56 
57                 p.setColor(Color.GRAY);
58                 // 画一个灰色圆形
59                 canvas.drawCircle((w - (count - 1) * juli) / 2 + juli * i, (float) (h * 0.9), radius, p);
60 
61             }
62 
63         }
64 
65     }
66 
67 }

    工具类：

     1 package untils;
 2 
 3 import android.app.Activity;
 4 import android.view.WindowManager;
 5 
 6 public class Untils {
 7 
 8     
 9     public static void toggleFullscreen(Activity activity,boolean fullScreen) {
10         // fullScreen为true时全屏
11 
12         WindowManager.LayoutParams attrs = activity.getWindow().getAttributes();
13 
14         if (fullScreen) {
15             attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
16         } else {
17             attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;
18         }
19 
20         activity.getWindow().setAttributes(attrs);
21     }
22 }

    xml文件：

     1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context="com.lixu.drawable.WelcomActivity" >
 6 
 7     <com.lixu.drawable.Mydrawable
 8         android:id="@+id/mydrawable"
 9         android:layout_width="match_parent"
10         android:layout_height="match_parent" />
11 
12     <android.support.v4.view.ViewPager
13         android:id="@+id/vp"
14         android:layout_width="match_parent"
15         android:layout_height="match_parent" >
16     </android.support.v4.view.ViewPager>
17 
18 </RelativeLayout>
     1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <ImageView
 8         android:id="@+id/iv1"
 9         android:layout_width="match_parent"
10         android:layout_height="match_parent" />
11 
12 </LinearLayout>
     1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:id="@+id/LinearLayout1"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:orientation="vertical" >
 7 
 8     <ImageView
 9         android:layout_weight="4"
10         android:id="@+id/iv2"
11         android:layout_width="match_parent"
12         android:layout_height="match_parent" />
13 
14     <Button
15         android:layout_weight="1"
16         android:id="@+id/btn"
17         android:layout_width="wrap_content"
18         android:layout_height="wrap_content"
19         android:layout_gravity="center"
20         android:text="进入QQ音乐" />
21 
22 </LinearLayout>
     1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6     
 7 <TextView  
 8     android:layout_width="match_parent"
 9     android:layout_height="match_parent"
10     android:text="我是主程序界面" 
11     android:textSize="35sp"
12     android:gravity="center"/>
13 </LinearLayout>

    运行效果图：
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  • 原文地址：https://www.cnblogs.com/labixiaoxin/p/5066904.html
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