android 自定义属性的使用

res/values/attr.xml

<?xml version="1.0" encoding="utf-8"?>

src/com/android/spt/MyView.java

package com.android.spt;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;public class MyView extends View{private Paint mPaint;private Context mContext;private static final String mString = "Welcome to Mi's world";public MyView(Context context, AttributeSet attrs){super(context, attrs);mPaint = new Paint();TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyView);int textColor = a.getColor(R.styleable.MyView_textColor, 0xFFFFFFFF);float textSize = a.getDimension(R.styleable.MyView_textSize, 20);mPaint.setTextSize(textSize);mPaint.setColor(textColor);a.recycle();}@Overrideprotected void onDraw(Canvas canvas){super.onDraw(canvas);mPaint.setStyle(Style.FILL);canvas.drawRect(new Rect(10,10,100,100),mPaint);canvas.drawText(mString, 10, 110, mPaint);}}

res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>

src/com/android/spt

package com.android.spt;import android.app.Activity;import android.os.Bundle;public class MiDemoActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }}

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