/Myselfcomponent/res/values/attrs.xml
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<resources>
<declare-styleable name=
"MyView"
>
<attr name=
"textColor"
format=
"color"
/>
<attr name=
"textSize"
format=
"dimension"
/>
<attr name=
"text"
format=
"string"
></attr>
</declare-styleable>
</resources>
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activity_main.xml
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<RelativeLayout xmlns:android=
"http://schemas.android.com/apk/res/android"
xmlns:tools=
"http://schemas.android.com/tools"
android:layout_width=
"match_parent"
android:layout_height=
"match_parent"
android:paddingBottom=
"@dimen/activity_vertical_margin"
android:paddingLeft=
"@dimen/activity_horizontal_margin"
android:paddingRight=
"@dimen/activity_horizontal_margin"
android:paddingTop=
"@dimen/activity_vertical_margin"
tools:context=
"com.example.myselfcomponent.MainActivity"
xmlns:my=
"http://schemas.android.com/apk/res/com.example.myselfcomponent"
>
<com.example.myselfcomponent.MyView
android:id=
"@+id/MyView1"
android:layout_width=
"match_parent"
android:layout_height=
"wrap_content"
my:textColor=
"#00ffff"
my:textSize=
"20sp"
my:text=
"自定义组件"
/>
</RelativeLayout>
<!-- my:textColor=
"#00ffff"
的前缀跟命名空间有关系
(tools:context=
"com.example.myselfcomponent.MainActivity"
xmlns:my=
"http://schemas.android.com/apk/res/com.example.myselfcomponent"
>)，
可以自定义
-->
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MyView
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package
com.example.myselfcomponent;
import
android.R.integer;
import
android.R.style;
import
android.content.Context;
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;
/**
* 自定义组件
* */
public
class
MyView
extends
View{
//画笔
Paint paint;
String text;
public
MyView(Context context) {
super
(context);
paint=
new
Paint();
paint.setColor(Color.BLACK);
paint.setTextSize(
28
);
// TODO Auto-generated constructor stub
}
public
MyView(Context context,AttributeSet attrs) {
// TODO Auto-generated constructor stub
super
(context, attrs);
paint=
new
Paint();
TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.MyView);
int
color=typedArray.getColor(R.styleable.MyView_textColor,
0xFFFFFF
);
float
size=typedArray.getDimension(R.styleable.MyView_textSize,
20
);
text=typedArray.getString(R.styleable.MyView_text);
paint.setColor(color);
paint.setTextSize(size);
//关闭资源
typedArray.recycle();
}
/**
* 初始化组件时被触发，进行组件的渲染
* Canvas 画布
* */
@Override
protected
void
onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super
.onDraw(canvas);
//设置画笔风格为实心
paint.setStyle(Style.FILL);
//绘制正方形
canvas.drawRect(
new
Rect(
10
,
10
,
90
,
90
), paint);
paint.setColor(Color.BLUE);
canvas.drawText(text,
10
,
110
, paint);
}
}
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MainActivity
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package
com.example.myselfcomponent;
import
android.app.Activity;
import
android.os.Bundle;
import
android.view.Menu;
import
android.view.MenuItem;
public
class
MainActivity
extends
Activity {
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public
boolean
onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return
true
;
}
@Override
public
boolean
onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int
id = item.getItemId();
if
(id == R.id.action_settings) {
return
true
;
}
return
super
.onOptionsItemSelected(item);
}
}
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本文转自 matengbing 51CTO博客，原文链接:http://blog.51cto.com/matengbing/1883078
