当我们个人开发者做一款Android应用时,难免会为找不到好看的图片资源而发愁,(不仅要写代码,还得要稍微会点PS什么的,唉!总之程序员什么都得要会一点。。。端好这碗饭可真不容易啊!)要不就是好看的图片资源有了,从而导致我们的软件过大!怎么办呐?
这里我给大家推荐一种简单实用的方法,就是颜色值强化使用!
通常我们在res里xml中可以定义UI布局,按钮的按下效果,配置文件等,参阅博客:http://smallwoniu.blog.51cto.com/3911954/1248892,其实还可以自己定义控件的一些显示属性。
官方文档
http://developer.android.com/guide/topics/resources/drawable-resource.html#Shape
查阅Shape Drawable,在res/drawable/文件夹下创建
例子:
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<? xml version = "1.0" encoding = "utf-8" ?>
< shape
xmlns:android = "http://schemas.android.com/apk/res/android"
android:shape=["rectangle" | "oval" | "line" | "ring"] >
< corners
android:radius = "integer"
android:topLeftRadius = "integer"
android:topRightRadius = "integer"
android:bottomLeftRadius = "integer"
android:bottomRightRadius = "integer" />
< gradient
android:angle = "integer"
android:centerX = "integer"
android:centerY = "integer"
android:centerColor = "integer"
android:endColor = "color"
android:gradientRadius = "integer"
android:startColor = "color"
android:type=["linear" | "radial" | "sweep"]
android:useLevel=["true" | "false"] />
< padding
android:left = "integer"
android:top = "integer"
android:right = "integer"
android:bottom = "integer" />
< size
android:width = "integer"
android:height = "integer" />
< solid
android:color = "color" />
< stroke
android:width = "integer"
android:color = "color"
android:dashWidth = "integer"
android:dashGap = "integer" />
</ shape >
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这里我们可以看到这个xml中有好多貌似我们都没用过的标签。。。(其实刚开始我也是在不知道什么地方看到的,一头雾水,觉得好玩就要研究研究么~)。首先,我们先来看一下:
1.shape 形状
作根标签,使用: android:shape=["rectangle" | "oval" | "line" | "ring"] >
值 | 描述 |
rectangle | 长方形,默认值 |
oval | 椭圆 |
line |
水平直线,可以通过<stroke>标签来定义宽度 |
ring | 环形 |
2.corners 圆角
用于shape被定义成rectangle时,使用: android:radius="integer"为角的弧度,值越大角越圆。
值 | 描述 |
android:topRightRadius | 右上角 |
android:bottomLeftRadius | 右下角 |
android:topLeftRadius |
左上角 |
android:bottomRightRadius | 左下角 |
注:默认值大于1才能显示出圆角,0为没有圆角。
3.gradient 渐变
指定shape的颜色值渐变,
android:type=["linear" | "radial" | "sweep"]
android:useLevel=["true" | "false"] />
值 | 描述 |
angle | 渐变角度。0是从左到右的,90是底部向顶部,必须是45的倍数,默认是0。 |
centerX | 以x位置为中心的渐变(0.0 -- 1.0)。 |
centerY | 以y位置为中心的渐变(0.0 -- 1.0)。 |
centerColor | 中心颜色 |
endColor | 结束颜色 |
gradientRadius | 径向渐变要指定半径值(android:type="radial" .) |
startColor | 开始颜色 |
type |
linear:线性渐变,默认值 radial: 径向渐变 sweep: 扫线渐变 |
useLevel | 设置资源管理的画板(不是很懂。。。) |
注:渐变角度:
4.padding 间隔(内边距)
5.size shape的宽和高
6.solid:实心
填充shape 使用:android:color指定填充的颜色
7.stroke:描边
值 | 描述 |
width | 描边的宽度 |
color | 描边的颜色 |
dashWidth | 一个虚线"-"的宽度 |
dashGap | 一个虚线"-"的隔开距离 |
ok! 差不多把官方文档上的连翻译带整理的总结完了,写一个简单的小例子,让大家直观的感受一下它的作用吧!
exit_dialog.xml
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<? xml version = "1.0" encoding = "utf-8" ?>
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
android:background = "@android:color/transparent"
android:orientation = "vertical" >
< LinearLayout
android:layout_width = "250dp"
android:layout_height = "wrap_content"
android:background = "@drawable/fragment_logout_button_backgroud_normal"
android:orientation = "vertical" >
< LinearLayout
android:layout_width = "fill_parent"
android:layout_height = "100dp"
android:orientation = "vertical" >
< TextView
android:id = "@+id/oneBtnInfo"
android:layout_width = "fill_parent"
android:layout_height = "40dp"
android:layout_margin = "2dp"
android:background = "@drawable/exit_bg"
android:gravity = "center"
android:text = "提示信息"
android:textColor = "#fff"
android:textSize = "20sp" />
< TextView
android:id = "@+id/tishiInfo"
android:layout_width = "fill_parent"
android:layout_height = "wrap_content"
android:layout_marginTop = "20dp"
android:gravity = "center"
android:text = "确定要退出?"
android:textColor = "#000"
android:textSize = "18sp" />
</ LinearLayout >
< LinearLayout
android:layout_width = "fill_parent"
android:layout_height = "50dp"
android:layout_margin = "2dp"
android:background = "@color/gray_light"
android:gravity = "center"
android:orientation = "horizontal"
android:padding = "5dp" >
< Button
android:id = "@+id/exit_btn"
android:layout_width = "fill_parent"
android:layout_height = "35dp"
android:layout_margin = "5dp"
android:layout_weight = "1"
android:background = "@drawable/fragment_logout_button_selector"
android:text = "确定"
android:textColor = "@color/black" />
< Button
android:id = "@+id/cancel_btn"
android:layout_width = "fill_parent"
android:layout_height = "35dp"
android:layout_margin = "5dp"
android:layout_weight = "1"
android:background = "@drawable/fragment_logout_button_selector"
android:text = "取消"
android:textColor = "@color/black" />
</ LinearLayout >
</ LinearLayout >
</ LinearLayout >
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这里使用到了我们前面讲到的shape,先列举一个(具体实现请看最后的源代码)
exit_bg.xml
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<? xml version = "1.0" encoding = "utf-8" ?>
< shape xmlns:android = "http://schemas.android.com/apk/res/android" >
< gradient
android:angle = "270"
android:centerColor = "@color/blue"
android:endColor = "@color/blue"
android:startColor = "@color/blue"
android:type = "linear" />
< stroke
android:width = "0.5dp"
android:color = "@color/blue" />
< corners
android:radius = "2dp"
android:topLeftRadius = "5dp"
android:topRightRadius = "5dp"
android:bottomLeftRadius = "0dp"
android:bottomRightRadius = "0dp"
/>
</ shape >
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MainActivity类
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package com.zhf.android_dialog_shape;
import com.zhf.android_dialog_shape_theme.R;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
/** * 测试自定义的Dialog(使用到了Shape Drawable)
* @author ZHF
*
*/
public class MainActivity extends Activity {
private AlertDialog alertDialog;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) this .findViewById(R.id.button);
button.setOnClickListener( new OnClickListener() {
@Override
public void onClick(View v) {
loadExitDialog();
}
});
}
/**弹出自定义对话框**/
private void loadExitDialog() {
alertDialog = new AlertDialog.Builder( this ).create();
alertDialog.show();
Window window = alertDialog.getWindow();
window.setContentView(R.layout.exit_dialog);
Button exit_btn = (Button) window.findViewById(R.id.exit_btn);
Button cancel_btn = (Button) window.findViewById(R.id.cancel_btn);
exit_btn.setOnClickListener( new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
cancel_btn.setOnClickListener( new OnClickListener() {
@Override
public void onClick(View v) {
alertDialog.dismiss();
}
});
}
} |
最终效果图:
仔细观察一下,圆角、渐变都已经出来了,貌似比系统自带的Dialog好看多了。
源码下载看附件
附件:http://down.51cto.com/data/2363598
本文转自zhf651555765 51CTO博客,原文链接:http://blog.51cto.com/smallwoniu/1307776,如需转载请自行联系原作者