自定义组件---图片和文字实现ImageButton效果

<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>