Androidの实现自定义带文字和图片的Button

package com.test; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.util.AttributeSet; import android.widget.Button; public class ImageTextButton2 extends Button { private int resourceId = 0; private Bitmap bitmap; public ImageTextButton2(Context context) { super(context,null); } public ImageTextButton2(Context context,AttributeSet attributeSet) { super(context, attributeSet); this.setClickable(true); resourceId = R.drawable.icon; //默认使用自带icon bitmap = BitmapFactory.decodeResource(getResources(), resourceId); } public void setIcon(int resourceId) { this.bitmap = BitmapFactory.decodeResource(getResources(), resourceId); invalidate(); //刷新view，自动调用onDraw } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub // 图片顶部居中显示 int x = (this.getMeasuredWidth() - bitmap.getWidth())/2; int y = 0; canvas.drawBitmap(bitmap, x, y, null); // 坐标需要转换，因为默认情况下Button中的文字居中显示 // 这里需要让文字在底部显示 canvas.translate(0,(this.getMeasuredHeight()/2) - (int) this.getTextSize()); super.onDraw(canvas); } }