自定义组件---图片和文字实现ImageButton效果

1、效果图

2、自定义代码：

<span style="font-family:Comic Sans MS;font-size:14px;">public class ImageTextView extends View implements OnClickListener {

	

	private Paint mImagePaint;

	private Paint mTextPaint;

	private int mTextSize=16;

	private Bitmap imageBitmap;  

	private Context context; 

	private int viewHeight;

	private DisplayMetrics displayMetrics;

	private int imageTop;

	private int textTop;

	 

	public ImageTextView(Context context) {

		super(context);

		this.context = context;

		init();

	}



	public ImageTextView(Context context, AttributeSet attrs) {

		super(context, attrs);

		this.context = context;

		init();

	}



	public ImageTextView(Context context, AttributeSet attrs, int defStyle) {

		super(context, attrs, defStyle);

		this.context = context;

		init();

	}

	/**

	 * 初始化数据

	 */

	private void init() {

		displayMetrics = getDisplayMetrics();

		mImagePaint = new Paint();

		mTextPaint = new Paint();

		mTextPaint.setColor(Color.BLACK);

		mTextPaint.setTextSize(mTextSize*displayMetrics.density);

//		

		mTextPaint.setAntiAlias(true); // 打开抗矩齿  

		imageBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.home); 

		//设置背景颜色

		setBackground(getResources().getDrawable(R.drawable.item_background_selector));

		//设置点击事件

		setOnClickListener(this);

	}

	

	@Override

	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

		super.onMeasure(widthMeasureSpec, heightMeasureSpec);

		viewHeight = getHeight();

		imageTop = (viewHeight - imageBitmap.getHeight())/2;

		//是文字在垂直方向上居中

		textTop = (int) ((viewHeight - getFontHeight(mTextPaint))/2-mTextPaint.getFontMetrics().top);

	}

	

	

	@Override

	protected void onDraw(Canvas canvas) {

		super.onDraw(canvas);

		canvas.drawBitmap(imageBitmap, 10, imageTop, mImagePaint);

		canvas.drawText("打开",imageBitmap.getWidth()+20, textTop, mTextPaint);

	}

	

	

	/**

	 * 获取手机分辨率

	 * @return

	 */

	public DisplayMetrics getDisplayMetrics() {   

        DisplayMetrics dm = new DisplayMetrics();   

        //取得DisplayMetrics对象方法一  

        dm = context.getApplicationContext().getResources().getDisplayMetrics();   

        //取得DisplayMetrics对象方法二  

//      ((Activity)cx).getWindowManager().getDefaultDisplay().getMetrics(dm);  

        return dm;   

     } 

	

	/**

	 * 获取字体的高度

	 * @param paint

	 * @return

	 */

	private int getFontHeight(Paint paint){

		FontMetrics fm = paint.getFontMetrics();

		return (int)Math.ceil(fm.descent - fm.ascent);  

	}



	/**

	 * 改变字体颜色

	 */

	@Override

	public boolean onTouchEvent(MotionEvent event) {

		switch (event.getAction()) {

		case MotionEvent.ACTION_DOWN:

			mTextPaint.setColor(Color.BLUE);

			break;

		case MotionEvent.ACTION_UP:

			mTextPaint.setColor(Color.BLACK);

			break;

		default:

			break;

		}

		invalidate();

		return super.onTouchEvent(event);

	}

	

	@Override

	public void onClick(View v) {

		 

	}

	 

}</span>

3、文字居中参考

http://blog.csdn.net/hursing/article/details/18703599