自定义控件：瀑布流水字母

 1 <RelativeLayout  2 xmlns:android="http://schemas.android.com/apk/res/android"  3  xmlns:tools="http://schemas.android.com/tools"  4  android:layout_width="match_parent"  5  android:layout_height="match_parent"  6  android:background="@android:color/background_light"  7  tools:context=".MainActivity" >  8  9 <TextView 10 android:layout_width="wrap_content" 11  android:layout_height="wrap_content" 12  android:layout_centerHorizontal="true" 13  android:text="@string/hello_world" 14  android:textColor="@android:color/white" /> 15 16 <com.example.empire.HkTextGroup 17 android:id="@+id/hk_text" 18  android:layout_width="fill_parent" 19  android:layout_height="fill_parent" 20  android:layout_marginTop="20dp" 21  android:background="@android:color/background_dark" /> 22 23 </RelativeLayout>

 1 package com.example.empire;  2  3 import android.content.Context;  4 import android.graphics.Canvas;  5 import android.graphics.Color;  6 import android.graphics.Paint;  7 import android.graphics.Paint.Align;  8 import android.graphics.Paint.Style;  9 import android.os.Handler;  10 import android.util.AttributeSet;  11 import android.view.View;  12  13 public class HkTextGroup extends View {  14  15 private char[] counts = new char[] {  16 'A', 'B', 'C', 'D', 'E', 'F', 'G',  17 'H', 'J', 'K', 'L', 'M', 'N', 'O' };  18  19 private Paint paint;  20 private Context ctx;  21 private Cell[][] cells;  22 // 像素值  23 private int textSize = 20;  24  25 public HkTextGroup(Context context, AttributeSet attrs) {  26 super(context, attrs);  27 ctx = context;  28  init();  29  }  30  31 private void init() {  32 paint = new Paint();  33 paint.setAntiAlias(true);  34  paint.setColor(Color.WHITE);  35 paint.setTextSize(textSize);// PX值  36  paint.setTextAlign(Align.LEFT);  37  paint.setStyle(Style.FILL);  38  39 cells = new Cell[list][row];  40 for (int j = 0; j < list; j++) {  41 for (int i = 0; i < row; i++) {  42 cells[j][i] = new Cell(i, j);  43 cells[j][i].alpha = 0;  44 cells[j][i].msg = ""  45 + counts[(int) (Math.random() * counts.length)];  46  }  47  }  48  }  49  50  @Override  51 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  52 super.onMeasure(widthMeasureSpec, heightMeasureSpec);  53 Utils.logleo("getWidth()::" + getWidth());  54 Utils.logleo("getHeight()::" + getHeight());  55  56 textSize = getWidth() / 10;  57 left_bottom = getHeight();  58  }  59  60 public float left;  61 public float left_bottom;  62  63 private Handler handler = new Handler() {  64 public void handleMessage(android.os.Message msg) {  65 int flag = msg.what;// 0 -- 10  66  67 for (int j = 0; j < list; j++) {  68  69 for (int i = row - 1; i >= 0; i--) {  70 // 1、如果第一行透明度为0，则有一定机率变为255  71 // 2、如果中间行透明度为0，不做处理  72 // 3、中间行不为0，依次减少一个梯度  73 // 4、我上面的一个是255，那么我也是255,而他亮度减1  74 Cell cell = cells[j][i];  75  76 if (i == 0) {  77 if (cell.alpha == 0) {  78 if (Math.random() * 10 > 9) {  79 cell.alpha = 255;  80  }  81 } else {  82 cell.alpha = cell.alpha - 25 > 0 ? cell.alpha - 25  83 : 0;  84  }  85 } else if (i > 0 && i <= row - 1) {  86 if (cells[j][i - 1].alpha == 255) {  87 cell.alpha = 255;  88 } else {  89 cell.alpha = cell.alpha - 25 > 0 ? cell.alpha - 25  90 : 0;  91  }  92  }  93  }  94  }  95  invalidate();  96  97  };  98  };  99 100 private int seed = 0; 101 private int stepCount = 11; 102 /** 行 */ 103 private int row = 20; 104 /** 列 */ 105 private int list = 20; 106 107  @Override 108 protected void onDraw(Canvas canvas) { 109 110 for (int j = 0; j < list; j++) { 111 for (int i = 0; i < row; i++) { 112 Cell cell = cells[j][i]; 113 // 小机率事件，改变内容 114 if (Math.random() * 100 > 85) { 115 cell.msg = "" 116 + counts[(int) (Math.random() * counts.length)]; 117  } 118 // 根据透明度确定颜色 119 if (cell.alpha == 255) { 120  paint.setColor(Color.WHITE); 121 } else { 122  paint.setColor(Color.GREEN); 123  } 124 // 设置透明度 125  paint.setAlpha(cell.alpha); 126 127 // 绘制 128 if (cell.alpha != 0) { 129 canvas.drawText(cell.msg, cell.j * 15, (float) (cell.i 130 * textSize * 0.6 + textSize), paint); 131  } 132  } 133  } 134 135 // seed = (seed + 1) % stepCount; 136 handler.sendEmptyMessageDelayed(seed, 10); 137  } 138 139 private class Cell { 140 public Cell(int i, int j) { 141 super(); 142 this.i = i; 143 this.j = j; 144  } 145 146 /** 行 */ 147 public int i; 148 /** 列 */ 149 public int j; 150 /** 种子 */ 151 public int seed; 152 /** 透明度 */ 153 public int alpha; 154 public String msg; 155 156  } 157 158 }

自定义控件：瀑布流水字母

  1 package com.example.empire;  2  3 import android.content.Context;  4 import android.graphics.Canvas;  5 import android.graphics.Color;  6 import android.graphics.Paint;  7 import android.graphics.Paint.Align;  8 import android.graphics.Paint.Style;  9 import android.os.Handler;  10 import android.util.AttributeSet;  11 import android.view.View;  12  13 public class HkText extends View {  14  15 private char[] counts = new char[] {  16 'A', 'B', 'C', 'D', 'E', 'F', 'G',  17 'H', 'J', 'K', 'L', 'M', 'N', 'O' };  18  19 private Paint paint;  20 private Context ctx;  21  22 public HkText(Context context, AttributeSet attrs) {  23 super(context, attrs);  24 ctx = context;  25  init();  26  }  27  28 /**  29  * 像素值  30 */  31 private int textSize = 20;  32  33 private void init() {  34 paint = new Paint();  35 paint.setAntiAlias(true);  36  paint.setColor(Color.WHITE);  37 paint.setTextSize(textSize);// PX值  38  paint.setTextAlign(Align.LEFT);  40  paint.setStyle(Style.FILL);  41  }  42  43  // private float sp2px(int sp){  44 // TypedValue.applyDimension(  45 // TypedValue.COMPLEX_UNIT_SP, sp, ctx.getResources().getDisplayMetrics());  46 //  47 // float px = sp * ctx.getResources().getDisplayMetrics().scaledDensity;  48 // return px;  49 // }  50 //  51 // private float px2sp(int px){  52 // float sp = px / ctx.getResources().getDisplayMetrics().scaledDensity;  53 // return sp;  54 // }  55  56  @Override  57 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  58 super.onMeasure(widthMeasureSpec, heightMeasureSpec);  59 Utils.logleo("getWidth()::" + getWidth());  60 Utils.logleo("getHeight()::" + getHeight());  61  62 textSize = getWidth() / 10;  63  }  64  65 public float left = 150;  66 public float left_bottom = 200;  67  68 private Handler handler = new Handler() {  69 public void handleMessage(android.os.Message msg) {  70 // int flag = msg.what;// 0 -- 10  72 // paint.setColor(Color.BLUE);  73  invalidate();  74  };  75  };  76  77 private int seed = 0;  79 private int stepCount = 11;  80  81  @Override  82 protected void onDraw(Canvas canvas) {  84 left = 10;  85 left_bottom = 400;  86 for (int i = 0; i < 20; i++) {  87  88 int seed_tem = seed;  89  90 int alpha = 255 - (i + seed_tem) * 25;  91 paint.setAlpha(alpha);// 0是没有  92  93 canvas.drawText(counts, i % counts.length, 1, left, 
 left_bottom,paint);  96 left_bottom = (float) (left_bottom - textSize * 0.6);  98  }  99 seed = (seed + 1) % stepCount; 100 handler.sendEmptyMessageDelayed(seed, 500); 101  } 102 103 }

 1 package com.example.empire;  3 import android.util.Log;  4  5 public class Utils {  7 public static boolean isShow = true;  9 public static void logleo(String msg) { 10 if (isShow) { 11 Log.i("leo", msg); 12  } 13  } 14 }

DEMO下载地址：http://pan.baidu.com/s/1mgkfQh6

自定义控件：瀑布流水字母

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