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   @Override13   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     @Override116     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   @Override38   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 }

 1 <RelativeLayout ="http://schemas.android.com/apk/res/android" 2   ="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.ViewPager13     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 <??> 2 <LinearLayout ="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 <??> 2 <LinearLayout ="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   <Button15     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 <??> 2 <LinearLayout ="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：

原标题：写程序的欢迎界面（运用画图方法画圆球）。

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