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今天给大家带来一个很简单但是很常用的控件ButtonExtendM，在开发中我们经常会用到图片加文字的组合控件，像这样：
以上图片都是从微信上截取的。（暂时没有找到icon在下，文字在上的例子）
下面我们通过一个控件来实现上下左右全部的样式，只需改动一个属性值即可改变icon的位置，是不是很方便，先看下demo效果图：
没错上图的三种不同的样式都是通过同一个控件实现的，下面我们看下代码
第一步 自定义属性
在res/values/目录下新建attrs.xml文件，
添加如下属性
<attr name="backColor" format="color" />
<attr name="backColorPress" format="color" />
<attr name="textColor" format="color" />
<attr name="textColorPress" format="color" /> <declare-styleable name="ButtonExtendM">
<attr name="backColor"/>
<attr name="backColorPress"/>
<attr name="textColor"/>
<attr name="textColorPress"/>
<attr name="iconDrawable" format="reference" />
<attr name="iconDrawablePress" format="reference" />
<attr name="text" format="string" />
<attr name="textSize" format="float" />
<attr name="spacing" format="dimension" />
<attr name="style">
<enum name="iconLeft" value="0" />
<enum name="iconRight" value="1" />
<enum name="iconUp" value="2" />
<enum name="iconBottom" value="3" />
</attr>
</declare-styleable>
第二步 新建布局文件view_button_extend_m.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"> <ImageView
android:id="@+id/iv_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/> <TextView
android:id="@+id/tv_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="@string/button_extend_m_default_text"/> </RelativeLayout>
第三步 新建ButtonExtendM.java继承RelativeLayout
package com.landptf.view; import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView; import com.landptf.R;
import com.landptf.util.ConvertM; /**
* Created by landptf on 2016/10/31.
* 扩展Button，支持文字和icon分上下左右四种方式显示
* 默认为左右结构，图片在左，文字在右
*/
public class ButtonExtendM extends RelativeLayout {
/**
* 左右结构，图片在左，文字在右
*/
public static final int STYLE_ICON_LEFT = 0;
/**
* 左右结构，图片在右，文字在左
*/
public static final int STYLE_ICON_RIGHT = 1;
/**
* 上下结构，图片在上，文字在下
*/
public static final int STYLE_ICON_UP = 2;
/**
* 上下结构，图片在下，文字在上
*/
public static final int STYLE_ICON_DOWN = 3; /**
* 定义控件
*/
private ImageView ivIcon;
private TextView tvContent;
/**
* 上下文
*/
private Context mContext;
/**
* View的背景色
*/
private int backColor = 0;
/**
* View被按下时的背景色
*/
private int backColorPress = 0;
/**
* icon的背景图片
*/
private Drawable iconDrawable = null;
/**
* icon被按下时显示的背景图片
*/
private Drawable iconDrawablePress = null;
/**
* View文字的颜色
*/
private ColorStateList textColor = null;
/**
* View被按下时文字的颜色
*/
private ColorStateList textColorPress = null;
/**
* 两个控件之间的间距，默认为8dp
*/
private int spacing = 8;
/**
* 两个控件的位置结构
*/
private int mStyle = STYLE_ICON_LEFT;
/**
* 标示onTouch方法的返回值，用来解决onClick和onTouch冲突问题
*/
private boolean isCost = true; private OnClickListener onClickListener = null; public interface OnClickListener {
void onClick(View v);
} /**
* 设置View的Click事件
*
* @param l
*/
public void setOnClickListener(OnClickListener l) {
this.onClickListener = l;
isCost = false;
} public ButtonExtendM(Context context) {
super(context);
mContext = context;
} public ButtonExtendM(Context context, AttributeSet attrs) {
this(context, attrs, 0);
} public ButtonExtendM(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
init(context, attrs, defStyle); } private void init(Context context, AttributeSet attrs, int defStyle) {
//加载布局
LayoutInflater.from(context).inflate(R.layout.view_button_extend_m, this, true);
//初始化控件
ivIcon = (ImageView) findViewById(R.id.iv_icon);
tvContent = (TextView) findViewById(R.id.tv_content);
setGravity(Gravity.CENTER);
TypedArray a = getContext().obtainStyledAttributes(
attrs, R.styleable.ButtonExtendM, defStyle, 0);
if (a != null) {
//设置背景色
ColorStateList colorList = a.getColorStateList(R.styleable.ButtonExtendM_backColor);
if (colorList != null) {
backColor = colorList.getColorForState(getDrawableState(), 0);
if (backColor != 0) {
setBackgroundColor(backColor);
}
}
//记录View被按下时的背景色
ColorStateList colorListPress = a.getColorStateList(R.styleable.ButtonExtendM_backColorPress);
if (colorListPress != null) {
backColorPress = colorListPress.getColorForState(getDrawableState(), 0);
}
//设置icon
iconDrawable = a.getDrawable(R.styleable.ButtonExtendM_iconDrawable);
if (iconDrawable != null) {
ivIcon.setImageDrawable(iconDrawable);
}
//记录View被按下时的icon的图片
iconDrawablePress = a.getDrawable(R.styleable.ButtonExtendM_iconDrawablePress);
//设置文字的颜色
textColor = a.getColorStateList(R.styleable.ButtonExtendM_textColor);
if (textColor != null) {
tvContent.setTextColor(textColor);
}
//记录View被按下时文字的颜色
textColorPress = a.getColorStateList(R.styleable.ButtonExtendM_textColorPress);
//设置显示的文本内容
String text = a.getString(R.styleable.ButtonExtendM_text);
if (text != null) {
//默认为隐藏的，设置文字后显示出来
tvContent.setVisibility(VISIBLE);
tvContent.setText(text);
}
//设置文本字体大小
float textSize = a.getFloat(R.styleable.ButtonExtendM_textSize, 0);
if (textSize != 0) {
tvContent.setTextSize(textSize);
}
//设置两个控件之间的间距
spacing = a.getDimensionPixelSize(R.styleable.ButtonExtendM_spacing, ConvertM.dp2px(context, 8));
//设置两个控件的位置结构
mStyle = a.getInt(R.styleable.ButtonExtendM_style, 0);
setIconStyle(mStyle);
a.recycle();
} setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent event) {
//根据touch事件设置按下抬起的样式
return setTouchStyle(event.getAction());
}
}); setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onClickListener != null) {
onClickListener.onClick(v);
}
}
});
} /**
* 根据按下或者抬起来改变背景和文字样式
*
* @param state
* @return isCost
*/
private boolean setTouchStyle(int state) {
if (state == MotionEvent.ACTION_DOWN) {
if (backColorPress != 0) {
setBackgroundColor(backColorPress);
}
if (iconDrawablePress != null) {
ivIcon.setImageDrawable(iconDrawablePress);
}
if (textColorPress != null) {
tvContent.setTextColor(textColorPress);
}
}
if (state == MotionEvent.ACTION_UP) {
if (backColor != 0) {
setBackgroundColor(backColor);
}
if (iconDrawable != null) {
ivIcon.setImageDrawable(iconDrawable);
}
if (textColor != null) {
tvContent.setTextColor(textColor);
}
}
return isCost;
} /**
* 设置图标位置
* 通过重置LayoutParams来设置两个控件的摆放位置
* @param style
*/
public void setIconStyle(int style) {
mStyle = style;
RelativeLayout.LayoutParams lp;
switch (style) {
case STYLE_ICON_LEFT:
lp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_VERTICAL);
ivIcon.setLayoutParams(lp);
lp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_VERTICAL);
lp.addRule(RelativeLayout.RIGHT_OF, ivIcon.getId());
lp.leftMargin = spacing;
tvContent.setLayoutParams(lp);
break;
case STYLE_ICON_RIGHT:
lp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_VERTICAL);
tvContent.setLayoutParams(lp);
lp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_VERTICAL);
lp.addRule(RelativeLayout.RIGHT_OF, tvContent.getId());
lp.leftMargin = spacing;
ivIcon.setLayoutParams(lp);
break;
case STYLE_ICON_UP:
lp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_HORIZONTAL);
ivIcon.setLayoutParams(lp);
lp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_HORIZONTAL);
lp.addRule(RelativeLayout.BELOW, ivIcon.getId());
lp.leftMargin = spacing;
tvContent.setLayoutParams(lp);
break;
case STYLE_ICON_DOWN:
lp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_HORIZONTAL);
tvContent.setLayoutParams(lp);
lp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_HORIZONTAL);
lp.addRule(RelativeLayout.BELOW, tvContent.getId());
lp.leftMargin = spacing;
ivIcon.setLayoutParams(lp);
break;
default:
break;
}
} /**
* 设置View的背景色
*
* @param backColor
*/
public void setBackColor(int backColor) {
this.backColor = backColor;
setBackgroundColor(backColor);
} /**
* 设置View被按下时的背景色
*
* @param backColorPress
*/
public void setBackColorPress(int backColorPress) {
this.backColorPress = backColorPress;
} /**
* 设置icon的图片
*
* @param iconDrawable
*/
public void setIconDrawable(Drawable iconDrawable) {
this.iconDrawable = iconDrawable;
ivIcon.setImageDrawable(iconDrawable);
} /**
* 设置View被按下时的icon的图片
*
* @param iconDrawablePress
*/
public void setIconDrawablePress(Drawable iconDrawablePress) {
this.iconDrawablePress = iconDrawablePress;
} /**
* 设置文字的颜色
*
* @param textColor
*/
public void setTextColor(int textColor) {
if (textColor == 0) return;
this.textColor = ColorStateList.valueOf(textColor);
tvContent.setTextColor(this.textColor);
} /**
* 设置View被按下时文字的颜色
*
* @param textColorPress
*/
public void setTextColorPress(int textColorPress) {
if (textColorPress == 0) return;
this.textColorPress = ColorStateList.valueOf(textColorPress);
} /**
* 设置显示的文本内容
*
* @param text
*/
public void setText(CharSequence text) {
//默认为隐藏的，设置文字后显示出来
tvContent.setVisibility(VISIBLE);
tvContent.setText(text);
} /**
* 获取显示的文本
*
* @return
*/
public String getText() {
return tvContent.getText().toString();
} /**
* 设置文本字体大小
*
* @param size
*/
public void setTextSize(float size) {
tvContent.setTextSize(size);
} /**
* 设置两个控件之间的间距
*
* @param spacing
*/
public void setSpacing(int spacing) {
this.spacing = ConvertM.dp2px(mContext, spacing);
//设置完成后刷新一下两个控件的结构，避免先执行了setIconStyle后，setSpacing不生效
setIconStyle(mStyle);
} }
代码注释基本可以看懂具体的实现，接下来主要看下如何使用
在layout里直接引用ButtonExtendM即可，注意要添加
xmlns:landptf="http://schemas.android.com/apk/res-auto"
<com.landptf.view.ButtonExtendM
android:id="@+id/bem_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="8dp"
landptf:iconDrawable="@drawable/title_back"
landptf:iconDrawablePress="@drawable/title_back_selected"
landptf:textColor="@android:color/white"
landptf:spacing="4dp"
landptf:text="返回"/>
这个是实现的菜单栏的返回按钮，左右结构，icon在左为默认样式，注意一下*Press的属性，主要是用来设置控件被按下后的效果的。
再来看一个上下结构的
<com.landptf.view.ButtonExtendM
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
landptf:iconDrawable="@drawable/icon_home_page"
landptf:text="首页"
landptf:style="iconUp" />
只需要设置landptf:style即可，同时也可以通过java代码实现
setIconStyle(ButtonExtendM.STYLE_ICON_UP)
全部代码已托管到开源中国的码云上，欢迎下载，地址：https://git.oschina.net/landptf/landptf.git