Android自定义组件-IconTextView

IconTextView是一个带图标的TextView，从TextView继承。

 

 

IconTextView类：

 

package com.view;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.TextView;
public class IconTextView extends TextView {

	private Bitmap bitmap;
	
	
	public IconTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
	
		int srcId = attrs.getAttributeResourceValue(null, "iconSrc", 0);
		if(srcId > 0) {
			bitmap = BitmapFactory.decodeResource(getResources(), srcId);
		}
	}

	@Override
	protected void onDraw(Canvas canvas) {
		if(bitmap != null) {
			//从原图上截取区域
			Rect src = new Rect();
			//目标区域
			Rect target = new Rect();
			
			src.left = 0;
			src.top = 0;
			src.right = bitmap.getWidth();
			src.bottom= bitmap.getHeight();
			
			int textHigh = (int)getTextSize();
			
			target.left = 0;
			target.top = (int)((getMeasuredHeight()-getTextSize())/2)+1;
			target.bottom = target.top + textHigh;
			target.right = (int)(textHigh * (bitmap.getWidth()/(float)bitmap.getHeight()));
			
			canvas.drawBitmap(bitmap, src, target, getPaint());
			canvas.translate(target.right+2, 0);
			
		}
		super.onDraw(canvas);
	}
	
}

 

效果图：

 

mian.xml:

 

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<com.view.IconTextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="我只能够呵呵"
    android:textSize="20px"
    iconSrc="@drawable/hehe"
    />
<com.view.IconTextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="我只能够呵呵"
    android:textSize="30px"
    />
<com.view.IconTextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="我只能够呵呵"
    android:textSize="40px"
    iconSrc="@drawable/hehe"
    />
<com.view.IconTextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="我只能够呵呵"
    android:textSize="50px"
    iconSrc="@drawable/hehe"
    />
<com.view.IconTextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="我只能够呵呵"
    android:textSize="60px"
    iconSrc="@drawable/hehe"
    />
</LinearLayout>