Android简明开发教程十六:Button 画刷示例

将RadioButton 换成Button ,类似的在res/layout 中新建brush.xml: 

<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android
    android:orientation=”vertical”
    android:background=”@drawable/white”
 android:layout_width=”fill_parent”
 android:layout_height=”fill_parent”>
    <com.pstreets.graphics2d.GuidebeeGraphics2DView
     android:id=”@+id/graphics2dview”
     android:layout_weight=”1″
     android:layout_width=”fill_parent”
     android:layout_height=”wrap_content”/>
 <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android
  android:layout_width=”wrap_content” android:layout_height=”wrap_content”
  android:orientation=”horizontal”
  
  >
  
   <Button android:text=”Pattern”
       android:id=”@+id/btnPattern”
    android:layout_width=”wrap_content”
    android:textColor=”@color/black”
    android:checked=”true”
    android:layout_height=”wrap_content”>
   </Button>
   <Button android:text=”Gradients”
        android:id=”@+id/btnGradients”
    android:layout_width=”wrap_content”
    android:textColor=”@color/black”
    android:layout_height=”wrap_content”>
   </Button>
 
 </LinearLayout> 

</LinearLayout> 

修改Brushes.java ,完整代码如下: 

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public class Brushes extends Graphics2DActivity
    implements OnClickListener { 
  
  private Button btnPattern;
  private Button btnGradients; 
  
  public void onCreate(Bundle savedInstanceState) {
   super .onCreate(savedInstanceState);
   setContentView(R.layout.brush);
   graphic2dView = (GuidebeeGraphics2DView)
       findViewById(R.id.graphics2dview);
   btnPattern = (Button) findViewById(R.id.btnPattern);
   btnGradients = (Button) findViewById(R.id.btnGradients);
   btnPattern.setOnClickListener( this );
   btnGradients.setOnClickListener( this );
 
  
  @Override
  protected void drawImage() {
   drawPatterns(); 
  
 
  
  @Override
  public void onClick(View view) {
   if (view == btnPattern) {
    drawPatterns();
   } else {
    drawGradient();
   }
   graphic2dView.refreshCanvas(); 
  
 
  
  private void drawPatterns() {
   TextureBrush brush1;
   TextureBrush brush2;
   TextureBrush brush3; 
  
   AffineTransform matrix1 = new AffineTransform();
   AffineTransform matrix2 = new AffineTransform();
   Bitmap bitmap
     = BitmapFactory.decodeResource(getResources(),
     R.drawable.brick);
   int [] rgbData = new int [bitmap.getHeight()
                           * bitmap.getWidth()];
   bitmap.getPixels(rgbData, 0 , bitmap.getWidth(), 0 , 0 ,
     bitmap.getWidth(), bitmap.getHeight());
   brush1 = new TextureBrush(rgbData, bitmap.getWidth(),
     bitmap.getHeight()); 
  
   bitmap = BitmapFactory.decodeResource(getResources(),
     R.drawable.bird);
   rgbData = new int [bitmap.getHeight() * bitmap.getWidth()];
   bitmap.getPixels(rgbData, 0 , bitmap.getWidth(), 0 , 0 ,
     bitmap.getWidth(), bitmap.getHeight());
   brush2 = new TextureBrush(rgbData, bitmap.getWidth(),
     bitmap.getHeight());
   brush3 = new TextureBrush(rgbData, bitmap.getWidth(),
     bitmap.getHeight(), 127 );
   matrix2.translate( 50 , 50 );
   // Clear the canvas with white color.
   graphics2D.clear(Color.WHITE);
   graphics2D.setAffineTransform(matrix1);
   graphics2D.fillRectangle(brush1,
      new Rectangle( 20 , 50 , 100 , 100 ));
   graphics2D.fillOval(brush2, 10 , 10 , 80 , 80 );
   graphics2D.setAffineTransform(matrix2);
   graphics2D.fillOval(brush3, 10 , 10 , 80 , 80 ); 
  
 
  
  private void drawGradient() {
   /* The linear gradient color */
   LinearGradientBrush brush1;
   /* The radial gradient color */
   RadialGradientBrush brush2;
   /* The second radial gradient color */
   RadialGradientBrush brush3; 
  
   char [] engText = "Brush" .toCharArray(); 
  
   FontEx font = FontEx.getSystemFont(); 
  
   int fontSize = 44 ;
   int X = 15 ;
   int Y = 50 ;
   int [] fractions = new int [] { 13 , 242 };
   Color[] colors = new Color[] { new Color( 0xffff6600 ),
     new Color( 0xffffff66 ) };
   brush1 = new LinearGradientBrush( 50 , 50 , 150 , 125 ,
     fractions, colors,
     Brush.NO_CYCLE); 
  
   fractions = new int [] { 13 , 128 , 255 };
   colors = new Color[] { new Color( 0xffff6600 ),
     new Color( 0xffffff66 ),
     new Color( 0xffff6600 ) };
   brush2 = new RadialGradientBrush( 90 , 100 , 50 ,
     fractions, colors); 
  
   fractions = new int [] { 0 , 255 };
   colors = new Color[] { new Color( 0xFFFFFF00 ),
     new Color( 0xFF000000 ) };
   brush3 = new RadialGradientBrush( 50 , 50 , 100 ,
     fractions, colors);
   // Clear the canvas with white color.
   graphics2D.clear(Color.white);
   graphics2D.fillRectangle(brush1,
     new Rectangle( 10 , 75 , 120 , 80 )); 
  
   Pen pen = new Pen(brush2, 8 );
   graphics2D.drawOval(pen, 20 , 60 , 100 , 50 );
   graphics2D.setDefaultBrush(brush3);
   pen = new Pen(brush2, 2 );
   graphics2D.setDefaultPen(pen);
   graphics2D.drawChars(font, fontSize, engText, 0 ,
     engText.length, X, Y);
 
  
}

Android简明开发教程十六:Button 画刷示例_第1张图片 

介绍了RadioButton和Button 后,这时应该对使用Android提供的控件的用法有了基本的认识。 控件提供了onClick(),onLongClick(),onFocusChange(),onKey(),onTouch(),onCreateContextMenu()等多种事件以相应用户。用多种方法来处理用户事件。一种是示例代码同过Activity实现OnClickListener接口,再有是采用如下代码为Button支持事件处理方法:

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// Create an anonymous implementation of OnClickListenerprivate
OnClickListener mCorkyListener = new OnClickListener() {   
    public void onClick(View v) {     
    // do something when the button is clicked  
    }
};
  
protected void onCreate(Bundle savedValues) {   
    ...  
    // Capture our button from layout   
    Button button = (Button)findViewById(R.id.corky);   
    // Register the onClick listener with the implementation above  
    button.setOnClickListener(mCorkyListener);  
    ...
  }

在创建自定义控件时,也可以重载onKeyDown(int, KeyEvent),onKeyUp(int, KeyEvent) ,onTouchEvent(MotionEvent)等来处理用户事件。

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