自定义控件,很多时间需要用到自定义的属性
首先在value文件夹中建立attrs.xml文件
添加内容如下
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="MyGifView">
<attr name="gif_drawable" format="reference" />
</declare-styleable>
</resources>
上面定义了一个自定义的属性,名称为MyGifView
其中包括了一个选项 giv_drawable, format类型为reference
在布局文件中,使用自定义属性
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:android_custom="http://schemas.android.com/apk/res/com.org.dengzh"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<com.org.dengzh.MyGifView
android:id="@+id/iv"
android:layout_width="300dp"
android:layout_height="150dip"
android_custom:gif_drawable="@drawable/test" />
</LinearLayout>
注意
xmlns:android_custom="http://schemas.android.com/apk/res/com.org.dengzh"
这一句, 最后的com.org.dengzh是你这个项目的包名
前面的xmlns:xxxx_xxx是你自己定义的前缀时,使用时 使用 前缀:属性名="值"的形式
如
android_custom:gif_drawable="@drawable/test"
这里我赋值给属性gif_drawable一张名为test的资源图片
在自定义中,取得赋值的属性的值
下面是一个自定义的可以显示Gif图片的View
package com.org.dengzh;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.util.AttributeSet;
import android.view.View;
public class MyGifView extends View {
private long movieStart;
private Movie movie;
private int givDrawable;
public MyGifView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
R.styleable.MyGifView);
// 获取自定义属性和默认值
givDrawable = mTypedArray.getResourceId(
R.styleable.MyGifView_gif_drawable, R.drawable.test);
movie = Movie.decodeStream(getResources().openRawResource(givDrawable));
}
@Override
protected void onDraw(Canvas canvas) {
long curTime = android.os.SystemClock.uptimeMillis();
if (movieStart == 0) {
movieStart = curTime;
}
if (movie != null) {
int duraction = movie.duration();
int relTime = (int) ((curTime - movieStart) % duraction);
movie.setTime(relTime);
movie.draw(canvas, 0, 0);
invalidate();
}
// super.onDraw(canvas);
}
}
TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
R.styleable.MyGifView);
// 获取自定义属性和默认值
givDrawable = mTypedArray.getResourceId(
R.styleable.MyGifView_gif_drawable, R.drawable.test);
这两行,首先取得名为MyGifView的属性数组
第二行,取得数组中的名为MyGifView_gif_drawable的属性的值,getResourceId的第二个参数是一个默认值,如果用户没有给giv_drawable赋值,那么就用默认值代替
最后附上format类型如下几种
1. reference:参考某一资源ID。
(1)属性定义:
<declare-styleable name = "名称">
<attr name = "background" format = "reference" />
</declare-styleable>
(2)属性使用:
<ImageView
android:layout_width = "42dip"
android:layout_height = "42dip"
android:background = "@drawable/图片ID"
/>
2. color:颜色值。
(1)属性定义:
<declare-styleable name = "名称">
<attr name = "textColor" format = "color" />
</declare-styleable>
(2)属性使用:
<TextView
android:layout_width = "42dip"
android:layout_height = "42dip"
android:textColor = "#00FF00"
/>
3. boolean:布尔值。
(1)属性定义:
<declare-styleable name = "名称">
<attr name= "focusable" format = "boolean" />
</declare-styleable>
4. dimension:尺寸值。
(1)属性定义:
<declare-styleable name = "名称">
<attr name = "layout_width" format = "dimension" />
</declare-styleable>
(2)属性使用:
<Button
android:layout_width = "42dip"
android:layout_height = "42dip"
/>
5. float:浮点值。
(1)属性定义:
<declare-styleable name = "AlphaAnimation">
<attr name = "fromAlpha" format = "float" />
<attr name = "toAlpha" format = "float" />
</declare-styleable>
(2)属性使用:
<alpha
android:fromAlpha = "1.0"
android:toAlpha = "0.7"
/>
6. integer:整型值。
(1)属性定义:
<declare-styleable name = "AnimatedRotateDrawable">
<attr name = "visible" />
<attr name = "frameDuration" format="integer" />
<attr name = "framesCount" format="integer" />
<attr name = "pivotX" />
<attr name = "pivotY" />
<attr name = "drawable" />
</declare-styleable>
(2)属性使用:
<animated-rotate
xmlns:android = "http://schemas.android.com/apk/res/android"
android:drawable = "@drawable/图片ID"
android:pivotX = "50%"
android:pivotY = "50%"
android:framesCount = "12"
android:frameDuration = "100"
/>
7. string:字符串。
(1)属性定义:
<declare-styleable name = "MapView">
<attr name = "apiKey" format = "string" />
</declare-styleable>
(2)属性使用:
<com.google.android.maps.MapView
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"
/>
8. fraction:百分数。
(1)属性定义:
<declare-styleable name="RotateDrawable">
<attr name = "visible" />
<attr name = "fromDegrees" format = "float" />
<attr name = "toDegrees" format = "float" />
<attr name = "pivotX" format = "fraction" />
<attr name = "pivotY" format = "fraction" />
<attr name = "drawable" />
</declare-styleable>
(2)属性使用:
<rotate
xmlns:android = "http://schemas.android.com/apk/res/android"
android:interpolator = "@anim/动画ID"
android:fromDegrees = "0"
android:toDegrees = "360"
android:pivotX = "200%"
android:pivotY = "300%"
android:duration = "5000"
android:repeatMode = "restart"
android:repeatCount = "infinite"
/>
9. enum:枚举值。
(1)属性定义:
<declare-styleable name="名称">
<attr name="orientation">
<enum name="horizontal" value="0" />
<enum name="vertical" value="1" />
</attr>
</declare-styleable>
(2)属性使用:
<LinearLayout
xmlns:android = "http://schemas.android.com/apk/res/android"
android:orientation = "vertical"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
>
</LinearLayout>
10. flag:位或运算。
(1)属性定义:
<declare-styleable name="名称">
<attr name="windowSoftInputMode">
<flag name = "stateUnspecified" value = "0" />
<flag name = "stateUnchanged" value = "1" />
<flag name = "stateHidden" value = "2" />
<flag name = "stateAlwaysHidden" value = "3" />
<flag name = "stateVisible" value = "4" />
<flag name = "stateAlwaysVisible" value = "5" />
<flag name = "adjustUnspecified" value = "0x00" />
<flag name = "adjustResize" value = "0x10" />
<flag name = "adjustPan" value = "0x20" />
<flag name = "adjustNothing" value = "0x30" />
</attr>
</declare-styleable>
(2)属性使用:
<activity
android:name = ".StyleAndThemeActivity"
android:label = "@string/app_name"
android:windowSoftInputMode = "stateUnspecified | stateUnchanged | stateHidden">
<intent-filter>
<action android:name = "android.intent.action.MAIN" />
<category android:name = "android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
注意:
属性定义时可以指定多种类型值。
(1)属性定义:
<declare-styleable name = "名称">
<attr name = "background" format = "reference|color" />
</declare-styleable>
(2)属性使用:
<ImageView
android:layout_width = "42dip"
android:layout_height = "42dip"
android:background = "@drawable/图片ID|#00FF00"
/>