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Android简明开发教程十八：自定义对话框 Transform

jerry Android 2015年08月24日 收藏

Android自带的AlertDialog,ProgressDialog,DatePickerDialog,TimePickerDialog 可以用于简单的对话框显示。当还是有这些对话框不能满足应用需要的时候，这时就可以使用一些自定义的对话框。有多种方法可以实现自定义对话框。一是使用Activity作为Dialog，可以通过设置Activity显示Dialog风格，使得该Activity在外观上和Dialog一致：显示在其它Activity前面且半透明。 

<Activity android:name=”MyDialogActivity” Android:theme=”@android:style/Theme.Dialog“></Activity> 

本例采用另外两种方法来使用自定义对话框,将用这个对话框来最为图形变换(Transform)的选项： 

Primitive: Rectange, Ellipse,Text
Pen: Thin,Thick,Dashed
Brush: Solid, Gradient,Texture
Transform: Identity, Rotate, Scale, Shear
Rendering: Stroke, Fill, Stoke and Fill 

 首先在res\layout 下新建transformoption.xml 作为自定义对话框布局： 

<?xml version=”1.0″ encoding=”utf-8″?> 

<LinearLayout
  xmlns:android=”http://schemas.android.com/apk/res/android”
  android:layout_width=”fill_parent”
  android:layout_height=”fill_parent” 

  >
<ScrollView
  android:layout_width=”fill_parent”
  android:layout_height=”fill_parent”>
<LinearLayout
  android:layout_width=”fill_parent”
  android:layout_height=”fill_parent”
  android:orientation=”vertical”
  >
<TextView
   android:text=”Primitive”
   android:layout_width=”wrap_content”
   android:layout_height=”wrap_content”>
 </TextView>
 <RadioGroup
 android:layout_width=”wrap_content”
 android:layout_height=”wrap_content”> 

<RadioButton
android:text=”Rectangle”
android:id=”@+id/radioRectangle”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Ellipse”
android:id=”@+id/radioEllipse”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Text”
android:id=”@+id/radioText”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
 </RadioGroup> 

<TextView
   android:text=”Pen”
   android:layout_width=”wrap_content”
   android:layout_height=”wrap_content”>
 </TextView>
 <RadioGroup
 android:layout_width=”wrap_content”
 android:layout_height=”wrap_content”> 

<RadioButton
android:text=”Thin”
android:id=”@+id/radioThin”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Thick”
android:id=”@+id/radioThick”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Dashed”
android:id=”@+id/radioDashed”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
 </RadioGroup>
 
<TextView
   android:text=”Brush”
   android:layout_width=”wrap_content”
   android:layout_height=”wrap_content”>
 </TextView>
 <RadioGroup
 android:layout_width=”wrap_content”
 android:layout_height=”wrap_content”> 

<RadioButton
android:text=”Solid”
android:id=”@+id/radioSolid”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Gradient”
android:id=”@+id/radioGradient”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Texture”
android:id=”@+id/radioTexture”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
 </RadioGroup>
 
 <TextView
   android:text=”Transform”
   android:layout_width=”wrap_content”
   android:layout_height=”wrap_content”>
 </TextView>
 <RadioGroup
 android:layout_width=”wrap_content”
 android:layout_height=”wrap_content”> 

<RadioButton
android:text=”Identity”
android:id=”@+id/radioIdentity”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Rotate”
android:id=”@+id/radioRotate”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Scale”
android:id=”@+id/radioScale”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Shear”
android:id=”@+id/radioShear”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
 </RadioGroup>
 
 <TextView
   android:text=”Rendering”
   android:layout_width=”wrap_content”
   android:layout_height=”wrap_content”>
 </TextView>
 <RadioGroup
 android:layout_width=”wrap_content”
 android:layout_height=”wrap_content”> 

<RadioButton
android:text=”Stroke”
android:id=”@+id/radioStroke”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Fill”
android:id=”@+id/radioFill”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
<RadioButton
android:text=”Stroke and Fill”
android:id=”@+id/radioStrokeFill”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”>
</RadioButton>
 </RadioGroup>
 </LinearLayout>
</ScrollView>
</LinearLayout> 

 一种方法是重新定制AlertDialog ，基本步骤和Android简明开发教程十七：Dialog 显示图像类似，但是在protected Dialog onCreateDialog(int id) ，需要重新设定Dialog的Content View并给RadioButton添加事件处理： 

  1. protected Dialog onCreateDialog(int id) {
  2.  final Dialog dialog;
  3.  switch (id) {
  4.  case OPTION_DIALOG:
  5.   LayoutInflater li
  6.     = LayoutInflater.from(this);
  7.   View optionView
  8.     = li.inflate(R.layout.transformoption, null);
  9.   AlertDialog.Builder optionDialog
  10.     = new AlertDialog.Builder(this);
  11.   optionDialog.setTitle("Options");
  12.   optionDialog.setView(optionView);
  13.   dialog = optionDialog.create();
  14.   RadioButton button = (RadioButton) optionView
  15.     .findViewById(R.id.radioRectangle);
  16.   button.setOnClickListener(new Button.OnClickListener() { 
  17.  
  18.    public void onClick(View v) {
  19.     primitiveIndex = PRIMITIVE_RECTANGLE;
  20.     drawImage();
  21.     dialog.dismiss(); 
  22.  
  23.    }
  24.   });
  25.   
  26.   ... 
  27.  
  28.   button = (RadioButton) optionView
  29.     .findViewById(R.id.radioStrokeFill);
  30.   button.setOnClickListener(new Button.OnClickListener() { 
  31.  
  32.    public void onClick(View v) {
  33.     renderingIndex = RENDERING_STROKE_AND_FILL;
  34.     drawImage();
  35.     dialog.dismiss(); 
  36.  
  37.    }
  38.   });
  39.   return dialog;
  40.  } 
  41.  
  42.  return null; 
  43.  
  44. }

第二种是通过派生Dialog ，定义了一个OptionDialog类作为Dialog子类。 

  1. class OptionDialog extends Dialog { 
  2.  
  3.  public OptionDialog(Context context) {
  4.   super(context);
  5.   // TODO Auto-generated constructor stub
  6.  }
  7.   
  8.  protected void onCreate(Bundle savedInstanceState) {
  9.   super.onCreate(savedInstanceState);
  10.   setContentView(R.layout.transformoption);
  11.   setTitle("Options");
  12.   RadioButton button
  13.      = (RadioButton) findViewById(R.id.radioRectangle);
  14.   button.setOnClickListener(new Button.OnClickListener() { 
  15.  
  16.    public void onClick(View v) {
  17.     primitiveIndex = PRIMITIVE_RECTANGLE;
  18.     drawImage();
  19.     dismiss(); 
  20.  
  21.    }
  22.   });
  23.   ...
  24.   button = (RadioButton) findViewById(R.id.radioStrokeFill);
  25.   button.setOnClickListener(new Button.OnClickListener() { 
  26.  
  27.    public void onClick(View v) {
  28.     renderingIndex = RENDERING_STROKE_AND_FILL;
  29.     drawImage();
  30.     dismiss(); 
  31.  
  32.    }
  33.   });
  34.  } 
  35.  
  36. }

这两种方法在显示Dialog时有所不同： 

  1. private OptionDialog optionDialog;
  2. static final private int OPTION_DIALOG = 1;
  3.  
  4. ...
  5. optionDialog = new OptionDialog(this);
  6.  
  7. ...
  8. @Override
  9. public void onClick(View view) {
  10.  // optionDialog.show();
  11.  showDialog(OPTION_DIALOG);
  12.  
  13. }

下面是完整代码： 

  1. public class Transform extends Graphics2DActivity
  2.   implements OnClickListener { 
  3.  
  4.  static int PRIMITIVE_RECTANGLE = 0;
  5.  static int PRIMITIVE_ELLIPSE = 1;
  6.  static int PRIMITIVE_TEXT = 2;
  7.  static int PEN_THIN = 0;
  8.  static int PEN_THICK = 1;
  9.  static int PEN_DASHED = 2;
  10.  static int BRUSH_SOLID = 0;
  11.  static int BRUSH_GRADIENT = 1;
  12.  static int BRUSH_TEXTURE = 2;
  13.  static int TRANSFORM_IDENTITY = 0;
  14.  static int TRANSFORM_ROTATE = 1;
  15.  static int TRANSFORM_SCALE = 2;
  16.  static int TRANSFORM_SHEAR = 3;
  17.  static int RENDERING_STROKE = 0;
  18.  static int RENDERING_FILL = 1;
  19.  static int RENDERING_STROKE_AND_FILL = 2;
  20.  int primitiveIndex;
  21.  int penIndex;
  22.  int brushIndex;
  23.  int transformIndex;
  24.  int renderingIndex;
  25.  int[] rgbData;
  26.  int bitmapWidth;
  27.  int bitmapHeight; 
  28.  
  29.  class OptionDialog extends Dialog { 
  30.  
  31.   public OptionDialog(Context context) {
  32.    super(context);
  33.    // TODO Auto-generated constructor stub
  34.   } 
  35.  
  36.   protected void onCreate(Bundle savedInstanceState) {
  37.    super.onCreate(savedInstanceState);
  38.    setContentView(R.layout.transformoption);
  39.    setTitle("Options");
  40.    RadioButton button
  41.       = (RadioButton) findViewById(R.id.radioRectangle);
  42.    button.setOnClickListener(new Button.OnClickListener() { 
  43.  
  44.     public void onClick(View v) {
  45.      primitiveIndex = PRIMITIVE_RECTANGLE;
  46.      drawImage();
  47.      dismiss(); 
  48.  
  49.     }
  50.    });
  51.    button = (RadioButton) findViewById(R.id.radioEllipse);
  52.    button.setOnClickListener(new Button.OnClickListener() { 
  53.  
  54.     public void onClick(View v) {
  55.      primitiveIndex = PRIMITIVE_ELLIPSE;
  56.      drawImage();
  57.      dismiss(); 
  58.  
  59.     }
  60.    });
  61.    button = (RadioButton) findViewById(R.id.radioText);
  62.    button.setOnClickListener(new Button.OnClickListener() { 
  63.  
  64.     public void onClick(View v) {
  65.      primitiveIndex = PRIMITIVE_TEXT;
  66.      drawImage();
  67.      dismiss(); 
  68.  
  69.     }
  70.    }); 
  71.  
  72.    button = (RadioButton) findViewById(R.id.radioThin);
  73.    button.setOnClickListener(new Button.OnClickListener() { 
  74.  
  75.     public void onClick(View v) {
  76.      penIndex = PEN_THIN;
  77.      drawImage();
  78.      dismiss(); 
  79.  
  80.     }
  81.    }); 
  82.  
  83.    button = (RadioButton) findViewById(R.id.radioThick);
  84.    button.setOnClickListener(new Button.OnClickListener() { 
  85.  
  86.     public void onClick(View v) {
  87.      penIndex = PEN_THICK;
  88.      drawImage();
  89.      dismiss(); 
  90.  
  91.     }
  92.    }); 
  93.  
  94.    button = (RadioButton) findViewById(R.id.radioDashed);
  95.    button.setOnClickListener(new Button.OnClickListener() { 
  96.  
  97.     public void onClick(View v) {
  98.      penIndex = PEN_DASHED;
  99.      drawImage();
  100.      dismiss(); 
  101.  
  102.     }
  103.    }); 
  104.  
  105.    button = (RadioButton) findViewById(R.id.radioSolid);
  106.    button.setOnClickListener(new Button.OnClickListener() { 
  107.  
  108.     public void onClick(View v) {
  109.      brushIndex = BRUSH_SOLID;
  110.      drawImage();
  111.      dismiss(); 
  112.  
  113.     }
  114.    }); 
  115.  
  116.    button = (RadioButton) findViewById(R.id.radioGradient);
  117.    button.setOnClickListener(new Button.OnClickListener() { 
  118.  
  119.     public void onClick(View v) {
  120.      brushIndex = BRUSH_GRADIENT;
  121.      drawImage();
  122.      dismiss(); 
  123.  
  124.     }
  125.    }); 
  126.  
  127.    button = (RadioButton) findViewById(R.id.radioTexture);
  128.    button.setOnClickListener(new Button.OnClickListener() { 
  129.  
  130.     public void onClick(View v) {
  131.      brushIndex = BRUSH_TEXTURE;
  132.      drawImage();
  133.      dismiss(); 
  134.  
  135.     }
  136.    }); 
  137.  
  138.    button = (RadioButton) findViewById(R.id.radioIdentity);
  139.    button.setOnClickListener(new Button.OnClickListener() { 
  140.  
  141.     public void onClick(View v) {
  142.      transformIndex = TRANSFORM_IDENTITY;
  143.      drawImage();
  144.      dismiss(); 
  145.  
  146.     }
  147.    }); 
  148.  
  149.    button = (RadioButton) findViewById(R.id.radioRotate);
  150.    button.setOnClickListener(new Button.OnClickListener() { 
  151.  
  152.     public void onClick(View v) {
  153.      transformIndex = TRANSFORM_ROTATE;
  154.      drawImage();
  155.      dismiss(); 
  156.  
  157.     }
  158.    }); 
  159.  
  160.    button = (RadioButton) findViewById(R.id.radioScale);
  161.    button.setOnClickListener(new Button.OnClickListener() { 
  162.  
  163.     public void onClick(View v) {
  164.      transformIndex = TRANSFORM_SCALE;
  165.      drawImage();
  166.      dismiss(); 
  167.  
  168.     }
  169.    }); 
  170.  
  171.    button = (RadioButton) findViewById(R.id.radioShear);
  172.    button.setOnClickListener(new Button.OnClickListener() { 
  173.  
  174.     public void onClick(View v) {
  175.      transformIndex = TRANSFORM_SHEAR;
  176.      drawImage();
  177.      dismiss(); 
  178.  
  179.     }
  180.    }); 
  181.  
  182.    button = (RadioButton) findViewById(R.id.radioStroke);
  183.    button.setOnClickListener(new Button.OnClickListener() { 
  184.  
  185.     public void onClick(View v) {
  186.      renderingIndex = RENDERING_STROKE;
  187.      drawImage();
  188.      dismiss(); 
  189.  
  190.     }
  191.    }); 
  192.  
  193.    button = (RadioButton) findViewById(R.id.radioFill);
  194.    button.setOnClickListener(new Button.OnClickListener() { 
  195.  
  196.     public void onClick(View v) {
  197.      renderingIndex = RENDERING_FILL;
  198.      drawImage();
  199.      dismiss(); 
  200.  
  201.     }
  202.    }); 
  203.  
  204.    button = (RadioButton) findViewById(R.id.radioStrokeFill);
  205.    button.setOnClickListener(new Button.OnClickListener() { 
  206.  
  207.     public void onClick(View v) {
  208.      renderingIndex = RENDERING_STROKE_AND_FILL;
  209.      drawImage();
  210.      dismiss(); 
  211.  
  212.     }
  213.    });
  214.   } 
  215.  
  216.  } 
  217.  
  218.  private OptionDialog optionDialog;
  219.  private Button btnOptions; 
  220.  
  221.  static final private int OPTION_DIALOG = 1; 
  222.  
  223.  private AffineTransform at = new AffineTransform();
  224.  private int w, h;
  225.  private IShape shapes[] = new IShape[3]; 
  226.  
  227.  private boolean firstTime = true;
  228.  private FontEx font = FontEx.getSystemFont(); 
  229.  
  230.  @Override
  231.  protected void drawImage() {
  232.   drawTransform(); 
  233.  
  234.  } 
  235.  
  236.  protected Dialog onCreateDialog(int id) {
  237.   final Dialog dialog;
  238.   switch (id) {
  239.   case OPTION_DIALOG:
  240.    LayoutInflater li
  241.      = LayoutInflater.from(this);
  242.    View optionView
  243.      = li.inflate(R.layout.transformoption, null);
  244.    AlertDialog.Builder optionDialog
  245.      = new AlertDialog.Builder(this);
  246.    optionDialog.setTitle("Options");
  247.    optionDialog.setView(optionView);
  248.    dialog = optionDialog.create();
  249.    RadioButton button = (RadioButton) optionView
  250.      .findViewById(R.id.radioRectangle);
  251.    button.setOnClickListener(new Button.OnClickListener() { 
  252.  
  253.     public void onClick(View v) {
  254.      primitiveIndex = PRIMITIVE_RECTANGLE;
  255.      drawImage();
  256.      dialog.dismiss(); 
  257.  
  258.     }
  259.    });
  260.    button = (RadioButton)
  261.        optionView.findViewById(R.id.radioEllipse);
  262.    button.setOnClickListener(new Button.OnClickListener() { 
  263.  
  264.     public void onClick(View v) {
  265.      primitiveIndex = PRIMITIVE_ELLIPSE;
  266.      drawImage();
  267.      dialog.dismiss(); 
  268.  
  269.     }
  270.    });
  271.    button = (RadioButton)
  272.      optionView.findViewById(R.id.radioText);
  273.    button.setOnClickListener(new Button.OnClickListener() { 
  274.  
  275.     public void onClick(View v) {
  276.      primitiveIndex = PRIMITIVE_TEXT;
  277.      drawImage();
  278.      dialog.dismiss(); 
  279.  
  280.     }
  281.    }); 
  282.  
  283.    button = (RadioButton)
  284.       optionView.findViewById(R.id.radioThin);
  285.    button.setOnClickListener(new Button.OnClickListener() { 
  286.  
  287.     public void onClick(View v) {
  288.      penIndex = PEN_THIN;
  289.      drawImage();
  290.      dialog.dismiss(); 
  291.  
  292.     }
  293.    }); 
  294.  
  295.    button = (RadioButton)
  296.       optionView.findViewById(R.id.radioThick);
  297.    button.setOnClickListener(new Button.OnClickListener() { 
  298.  
  299.     public void onClick(View v) {
  300.      penIndex = PEN_THICK;
  301.      drawImage();
  302.      dialog.dismiss(); 
  303.  
  304.     }
  305.    }); 
  306.  
  307.    button = (RadioButton)
  308.        optionView.findViewById(R.id.radioDashed);
  309.    button.setOnClickListener(new Button.OnClickListener() { 
  310.  
  311.     public void onClick(View v) {
  312.      penIndex = PEN_DASHED;
  313.      drawImage();
  314.      dialog.dismiss(); 
  315.  
  316.     }
  317.    }); 
  318.  
  319.    button = (RadioButton)
  320.        optionView.findViewById(R.id.radioSolid);
  321.    button.setOnClickListener(new Button.OnClickListener() { 
  322.  
  323.     public void onClick(View v) {
  324.      brushIndex = BRUSH_SOLID;
  325.      drawImage();
  326.      dialog.dismiss(); 
  327.  
  328.     }
  329.    }); 
  330.  
  331.    button = (RadioButton)
  332.        optionView.findViewById(R.id.radioGradient);
  333.    button.setOnClickListener(new Button.OnClickListener() { 
  334.  
  335.     public void onClick(View v) {
  336.      brushIndex = BRUSH_GRADIENT;
  337.      drawImage();
  338.      dialog.dismiss(); 
  339.  
  340.     }
  341.    }); 
  342.  
  343.    button = (RadioButton)
  344.        optionView.findViewById(R.id.radioTexture);
  345.    button.setOnClickListener(new Button.OnClickListener() { 
  346.  
  347.     public void onClick(View v) {
  348.      brushIndex = BRUSH_TEXTURE;
  349.      drawImage();
  350.      dialog.dismiss(); 
  351.  
  352.     }
  353.    }); 
  354.  
  355.    button = (RadioButton)
  356.        optionView.findViewById(R.id.radioIdentity);
  357.    button.setOnClickListener(new Button.OnClickListener() { 
  358.  
  359.     public void onClick(View v) {
  360.      transformIndex = TRANSFORM_IDENTITY;
  361.      drawImage();
  362.      dialog.dismiss(); 
  363.  
  364.     }
  365.    }); 
  366.  
  367.    button = (RadioButton)
  368.        optionView.findViewById(R.id.radioRotate);
  369.    button.setOnClickListener(new Button.OnClickListener() { 
  370.  
  371.     public void onClick(View v) {
  372.      transformIndex = TRANSFORM_ROTATE;
  373.      drawImage();
  374.      dialog.dismiss(); 
  375.  
  376.     }
  377.    }); 
  378.  
  379.    button = (RadioButton)
  380.        optionView.findViewById(R.id.radioScale);
  381.    button.setOnClickListener(new Button.OnClickListener() { 
  382.  
  383.     public void onClick(View v) {
  384.      transformIndex = TRANSFORM_SCALE;
  385.      drawImage();
  386.      dialog.dismiss(); 
  387.  
  388.     }
  389.    }); 
  390.  
  391.    button = (RadioButton)
  392.       optionView.findViewById(R.id.radioShear);
  393.    button.setOnClickListener(new Button.OnClickListener() { 
  394.  
  395.     public void onClick(View v) {
  396.      transformIndex = TRANSFORM_SHEAR;
  397.      drawImage();
  398.      dialog.dismiss(); 
  399.  
  400.     }
  401.    }); 
  402.  
  403.    button = (RadioButton)
  404.        optionView.findViewById(R.id.radioStroke);
  405.    button.setOnClickListener(new Button.OnClickListener() { 
  406.  
  407.     public void onClick(View v) {
  408.      renderingIndex = RENDERING_STROKE;
  409.      drawImage();
  410.      dialog.dismiss(); 
  411.  
  412.     }
  413.    }); 
  414.  
  415.    button = (RadioButton)
  416.        optionView.findViewById(R.id.radioFill);
  417.    button.setOnClickListener(new Button.OnClickListener() { 
  418.  
  419.     public void onClick(View v) {
  420.      renderingIndex = RENDERING_FILL;
  421.      drawImage();
  422.      dialog.dismiss(); 
  423.  
  424.     }
  425.    }); 
  426.  
  427.    button = (RadioButton) optionView
  428.      .findViewById(R.id.radioStrokeFill);
  429.    button.setOnClickListener(new Button.OnClickListener() { 
  430.  
  431.     public void onClick(View v) {
  432.      renderingIndex = RENDERING_STROKE_AND_FILL;
  433.      drawImage();
  434.      dialog.dismiss(); 
  435.  
  436.     }
  437.    });
  438.    return dialog;
  439.   } 
  440.  
  441.   return null; 
  442.  
  443.  } 
  444.  
  445.  public void onCreate(Bundle savedInstanceState) {
  446.   super.onCreate(savedInstanceState);
  447.   setContentView(R.layout.transform);
  448.   graphic2dView = (GuidebeeGraphics2DView)
  449.      findViewById(R.id.graphics2dview);
  450.   btnOptions = (Button) findViewById(R.id.btnOption);
  451.   btnOptions.setOnClickListener(this);
  452.   shapes[0] = new Rectangle(0, 0, 100, 100);
  453.   shapes[1] = new Ellipse(0, 0, 100, 100);
  454.   IShape[] fontShapes = font.getGlyphArray(96,
  455.          "TEXT".toCharArray(), 0,
  456.     4, FontEx.TEXT_DIR_LR);
  457.   shapes[2] = new Area(fontShapes[0]);
  458.   for (int i = 1; i < fontShapes.length; i++) {
  459.    ((Area) shapes[2]).add(new Area(fontShapes[i]));
  460.   }
  461.   Bitmap bitmap = BitmapFactory.decodeResource(
  462.           getResources(),
  463.     R.drawable.brick);
  464.   bitmapWidth = bitmap.getWidth();
  465.   bitmapHeight = bitmap.getHeight(); 
  466.  
  467.   rgbData = new int[bitmapWidth * bitmapHeight];
  468.   bitmap.getPixels(rgbData, 0, bitmapWidth, 0, 0,
  469.      bitmapWidth,
  470.     bitmapHeight);
  471.   w = SharedGraphics2DInstance.CANVAS_WIDTH;
  472.   h = SharedGraphics2DInstance.CANVAS_HEIGHT;
  473.   optionDialog = new OptionDialog(this); 
  474.  
  475.  } 
  476.  
  477.  private void setTrans(int transIndex) {
  478.   // Sets the AffineTransform.
  479.   switch (transIndex) {
  480.   case 0:
  481.    at.setToIdentity();
  482.    at.translate(w / 2, h / 2);
  483.    break;
  484.   case 1:
  485.    at.rotate(Math.toRadians(45));
  486.    break;
  487.   case 2:
  488.    at.scale(0.5, 0.5);
  489.    break;
  490.   case 3:
  491.    at.shear(0.5, 0.0);
  492.    break;
  493.   }
  494.  } 
  495.  
  496.  private void drawTransform() {
  497.   graphics2D.clear(Color.WHITE);
  498.   graphics2D.Reset();
  499.   setTrans(transformIndex);
  500.   graphics2D.setAffineTransform(at); 
  501.  
  502.   // Initialize the transform.
  503.   if (firstTime) {
  504.    at.setToIdentity();
  505.    at.translate(w / 2, h / 2); 
  506.  
  507.    firstTime = false;
  508.   } 
  509.  
  510.   // Sets the Stroke.
  511.   Pen pen = null; 
  512.  
  513.   switch (penIndex) {
  514.   case 0:
  515.    pen = new Pen(Color.BLACK, 1);
  516.    break;
  517.   case 1:
  518.    pen = new Pen(Color.BLACK, 8);
  519.    break;
  520.   case 2: {
  521.    int dash[] = { 10, 10 };
  522.    pen = new Pen(Color.BLACK, 1, Pen.CAP_BUTT,
  523.      Pen.JOIN_MITER, dash, 0);
  524.   }
  525.    break;
  526.   } 
  527.  
  528.   // Sets the Paint.
  529.   Brush brush = null; 
  530.  
  531.   switch (brushIndex) {
  532.   case 0:
  533.    brush = new SolidBrush(Color.BLUE);
  534.    break;
  535.   case 1: {
  536.    int[] fractions = new int[] { 13, 242 };
  537.    Color[] colors = new Color[] { new Color(0xffff6600),
  538.      new Color(0xffffff66) };
  539.    brush = new LinearGradientBrush(50, 50, 150,
  540.      125, fractions,
  541.      colors, Brush.REPEAT);
  542.   } 
  543.  
  544.    break;
  545.   case 2:
  546.    try { 
  547.  
  548.     brush = new TextureBrush(rgbData,
  549.       bitmapWidth, bitmapHeight);
  550.    } catch (Exception e) {
  551.    }
  552.    break;
  553.   } 
  554.  
  555.   // Sets the Shape.
  556.   IShape shape = shapes[primitiveIndex];
  557.   Rectangle r = shape.getBounds();
  558.   AffineTransform toCenterAt = new AffineTransform();
  559.   toCenterAt.concatenate(at);
  560.   toCenterAt.translate(-(r.width / 2), -(r.height / 2)); 
  561.  
  562.   graphics2D.setAffineTransform(toCenterAt);
  563.   // Sets the rendering method.
  564.   switch (renderingIndex) {
  565.   case 0:
  566.    graphics2D.setDefaultPen(pen);
  567.    graphics2D.draw(null, shape);
  568.    break;
  569.   case 1:
  570.    graphics2D.setDefaultBrush(brush);
  571.    graphics2D.fill(null, shape);
  572.    break;
  573.   case 2:
  574.    graphics2D.setPenAndBrush(pen, brush);
  575.    graphics2D.fill(null, shape);
  576.    graphics2D.draw(null, shape);
  577.    break;
  578.   }
  579.   graphic2dView.refreshCanvas(); 
  580.  
  581.  } 
  582.  
  583.  @Override
  584.  public void onClick(View view) {
  585.   // optionDialog.show();
  586.   showDialog(OPTION_DIALOG); 
  587.  
  588.  }
  589. }

  1. 上面代码中包含了两种方法的代码，实际应用中可以任选其一。
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