Android Open Source - AppSearchWidget Key Image Button

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License

The source code is released under:

Apache License

Java Source Code

package com.example.testwidget;
//www .j av  a  2s.co m
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ImageButton;

public class KeyImageButton extends ImageButton {
  private static final String TAG = "KeyImageButton";
  private static final double TEXT_SCALE_FACT = 0.8;
  private Character mKeyCharacter = new Character('j');
  private Canvas mOffscreenKeyCanvas = new Canvas();
  private Bitmap mKeyCharBitmap;
  private Paint mCharPaint, mRectPaint;
  
  public KeyImageButton(Context context) {
    super(context);
    initCharPaint();
  }

  public KeyImageButton(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    extractKeyCharacterFromResources(context, attrs);
    initCharPaint();
  }

  public KeyImageButton(Context context, AttributeSet attrs) {
    super(context, attrs);
    extractKeyCharacterFromResources(context, attrs);
    initCharPaint();
  }
  
  private void extractKeyCharacterFromResources(Context context, AttributeSet attrs) {
//    TypedArray a = context.obtainStyledAttributes(attrs,
//        R.styleable.com_example_keysimulator_KeyImageButton);
//    
//    String keyCharAttr = a.getString(R.styleable.com_example_keysimulator_KeyImageButton_key_character);
//    
//    if (keyCharAttr != null) {
//      mKeyCharacter = keyCharAttr.charAt(0);
//    }
//    
//    a.recycle();
  }
  
  public Character getKeyCharacter() {
    return mKeyCharacter;
  }
  
  public void setKeyCharacter(Character keyCharacter) {
    mKeyCharacter = Character.valueOf(keyCharacter.charValue());
  }
  
  private void initCharPaint() {
    mCharPaint = new Paint();
    mCharPaint.setARGB(0xFF, 0xFF, 0xFF, 0xFF);
    mCharPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
    
    mRectPaint = new Paint();
    mRectPaint.setARGB(0xFF, 0xFF, 0, 0);
    mRectPaint.setStyle(Paint.Style.STROKE);
    mRectPaint.setStrokeWidth(1);
  }
  
  private void allocateCharBitmapIfNeeded() {
    if (mKeyCharBitmap == null) {
      mCharPaint.setTextSize((float) Math.min(getWidth() * TEXT_SCALE_FACT,
          getHeight() * TEXT_SCALE_FACT));
      
      Rect bounds = new Rect();
      mCharPaint.getTextBounds(mKeyCharacter + "", 0, 1, bounds);
      mKeyCharBitmap = Bitmap.createBitmap(bounds.width() + 2,
          Math.abs(bounds.bottom - bounds.top) + 2, Config.ARGB_8888);
      
      Log.i(TAG, "bounds for " + mKeyCharacter + " : " + bounds.toShortString());
      Log.i(TAG, "keychar height: " + Math.abs(bounds.bottom - bounds.top));
    }
  }
  
  /*
   * Draw 'character' into the offscreen canvas.
   */
  private void drawCharInBitmap(Character character) {
    allocateCharBitmapIfNeeded();
    mOffscreenKeyCanvas.setBitmap(mKeyCharBitmap);
    
    Rect bounds = new Rect();
    mCharPaint.getTextBounds(mKeyCharacter + "", 0, 1, bounds);
    
    mOffscreenKeyCanvas.drawText(character + "", -bounds.left, -bounds.top, mCharPaint);    
    mOffscreenKeyCanvas.drawRect(new Rect(0,0,
        Math.abs(bounds.right - bounds.left),
        Math.abs(bounds.bottom - bounds.top)), mRectPaint);
  }
  
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    
    // Draw the key character in the box
    drawCharInBitmap(mKeyCharacter);
    
    // Figure out where to position the character bitmap.
    float displacementX = getWidth()/2 - mKeyCharBitmap.getWidth()/2;
    float displacementY = getHeight()/2 - mKeyCharBitmap.getHeight()/2;
    canvas.drawBitmap(mKeyCharBitmap, displacementX, displacementY, null);
  }
}

Java Source Code List

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