Android之创建自定义属性
< resources >
< declare-styleable name ="customView" >
< attr name ="android:textColor" />//在自定义属性中使用Android自带的属性名字
< attr name ="customtextSize" format ="dimension" />//自定义属性,format属性表示该属性的单位
declare-styleable >
resources>
二、 我们在customView.java 代码修改如下,其中下面的构造方法是重点,我们获取定义的属性R.sytleable.customView_android_textColor和R.sytleable.customView_customtextSize, 获取方法中后面通常设定默认值(float textSize = a.getDimension(R.styleable.customView_customtextSize , 36 ); ), 防止我们在xml 文件中没有定义.从而使用默认值!
获取,customView 就是定义在
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
public class customView extends View{
private Paint mPaint;
private static final String mString = "Welcome to Mr Wei's blog";
public customView(Context context) {
super(context);
mPaint = new Paint();
// TODO Auto-generated constructor stub
}
public customView(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint();
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.customView);
int textColor = a.getColor(R.styleable.customView_android_textColor, 0xff0000);
float textSize = a.getDimension(R.styleable.customView_customtextSize, 36);
mPaint.setColor(textColor);
mPaint.setTextSize(textSize);
a.recycle();
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
//设置填充
mPaint.setStyle(Style.FILL);
//画一个矩形,前俩个是矩形左上角坐标,后面俩个是右下角坐标
canvas.drawRect(new Rect(10, 10, 200, 200), mPaint);
mPaint.setColor(Color.BLUE);
//绘制文字
canvas.drawText(mString, 10, 110, mPaint);
}
}
三、将我们自定义的customView加入布局main.xml 文件中,平且使用自定义属性,自定义属性必须加上:
xmlns:test ="http://schemas.android.com/apk/res/com.lee0000.AutoCustomAttr "蓝色 是自定义属性的前缀,红色 是我们包名.main.xml 全部代码如下:
<? xml version="1.0" encoding="utf-8" ?>< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
xmlns:test ="http://schemas.android.com/apk/res/com.lee0000.AutoCustomAttr"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
android:orientation ="vertical" >
< TextView
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
android:text ="@string/hello" />
< com.lee0000.AutoCustomAttr.customView
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
test:customtextSize ="20dp"//自定义属性
android:textColor ="#fff" >
com.lee0000.AutoCustomAttr.customView >
LinearLayout >
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