今天給大家帶來一個很簡單但是很常用的控制元件ButtonExtendM,在開發中我們經常會用到圖片加文字的組合控制元件,像這樣:

這裡寫圖片描述

這裡寫圖片描述

這裡寫圖片描述

以上圖片都是從微信上擷取的。(暫時沒有找到icon在下,文字在上的例子)

下面我們通過一個控制元件來實現上下左右全部的樣式,只需改動一個屬性值即可改變icon的位置,是不是很方便,先看下demo效果圖:

這裡寫圖片描述

沒錯上圖的三種不同的樣式都是通過同一個控制元件實現的,下面我們看下程式碼

第一步 自定義屬性
在res/values/目錄下新建attrs.xml檔案,
新增如下屬性

    <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 新建佈局檔案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繼承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.
 * 擴充套件Button,支援文字和icon分上下左右四種方式顯示
 * 預設為左右結構,圖片在左,文字在右
 */
public class ButtonExtendM extends RelativeLayout {
    /**
     * 左右結構,圖片在左,文字在右
     */
    public static final int STYLE_ICON_LEFT = 0;
    /**
     * 左右結構,圖片在右,文字在左
     */
    public static final int STYLE_ICON_RIGHT = 1;
    /**
     * 上下結構,圖片在上,文字在下
     */
    public static final int STYLE_ICON_UP = 2;
    /**
     * 上下結構,圖片在下,文字在上
     */
    public static final int STYLE_ICON_DOWN = 3;

    /**
     * 定義控制元件
     */
    private ImageView ivIcon;
    private TextView tvContent;
    /**
     * 上下文
     */
    private Context mContext;
    /**
     * View的背景色
     */
    private int backColor = 0;
    /**
     * View被按下時的背景色
     */
    private int backColorPress = 0;
    /**
     * icon的背景圖片
     */
    private Drawable iconDrawable = null;
    /**
     * icon被按下時顯示的背景圖片
     */
    private Drawable iconDrawablePress = null;
    /**
     * View文字的顏色
     */
    private ColorStateList textColor = null;
    /**
     * View被按下時文字的顏色
     */
    private ColorStateList textColorPress = null;
    /**
     * 兩個控制元件之間的間距,預設為8dp
     */
    private int spacing = 8;
    /**
     * 兩個控制元件的位置結構
     */
    private int mStyle = STYLE_ICON_LEFT;
    /**
     * 標示onTouch方法的返回值,用來解決onClick和onTouch衝突問題
     */
    private boolean isCost = true;

    private OnClickListener onClickListener = null;

    public interface OnClickListener {
        void onClick(View v);
    }

    /**
     * 設定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) {
        //載入佈局
        LayoutInflater.from(context).inflate(R.layout.view_button_extend_m, this, true);
        //初始化控制元件
        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) {
            //設定背景色
            ColorStateList colorList = a.getColorStateList(R.styleable.ButtonExtendM_backColor);
            if (colorList != null) {
                backColor = colorList.getColorForState(getDrawableState(), 0);
                if (backColor != 0) {
                    setBackgroundColor(backColor);
                }
            }
            //記錄View被按下時的背景色
            ColorStateList colorListPress = a.getColorStateList(R.styleable.ButtonExtendM_backColorPress);
            if (colorListPress != null) {
                backColorPress = colorListPress.getColorForState(getDrawableState(), 0);
            }
            //設定icon
            iconDrawable = a.getDrawable(R.styleable.ButtonExtendM_iconDrawable);
            if (iconDrawable != null) {
                ivIcon.setImageDrawable(iconDrawable);
            }
            //記錄View被按下時的icon的圖片
            iconDrawablePress = a.getDrawable(R.styleable.ButtonExtendM_iconDrawablePress);
            //設定文字的顏色
            textColor = a.getColorStateList(R.styleable.ButtonExtendM_textColor);
            if (textColor != null) {
                tvContent.setTextColor(textColor);
            }
            //記錄View被按下時文字的顏色
            textColorPress = a.getColorStateList(R.styleable.ButtonExtendM_textColorPress);
            //設定顯示的文字內容
            String text = a.getString(R.styleable.ButtonExtendM_text);
            if (text != null) {
                //預設為隱藏的,設定文字後顯示出來
                tvContent.setVisibility(VISIBLE);
                tvContent.setText(text);
            }
            //設定文字字型大小
            float textSize = a.getFloat(R.styleable.ButtonExtendM_textSize, 0);
            if (textSize != 0) {
                tvContent.setTextSize(textSize);
            }
            //設定兩個控制元件之間的間距
            spacing = a.getDimensionPixelSize(R.styleable.ButtonExtendM_spacing, ConvertM.dp2px(context, 8));
            //設定兩個控制元件的位置結構
            mStyle = a.getInt(R.styleable.ButtonExtendM_style, 0);
            setIconStyle(mStyle);
            a.recycle();
        }

        setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View arg0, MotionEvent event) {
                //根據touch事件設定按下擡起的樣式
                return setTouchStyle(event.getAction());
            }
        });

        setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (onClickListener != null) {
                    onClickListener.onClick(v);
                }
            }
        });
    }

    /**
     * 根據按下或者擡起來改變背景和文字樣式
     *
     * @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;
    }

    /**
     * 設定圖示位置
     * 通過重置LayoutParams來設定兩個控制元件的擺放位置
     * @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;
        }
    }

    /**
     * 設定View的背景色
     *
     * @param backColor
     */
    public void setBackColor(int backColor) {
        this.backColor = backColor;
        setBackgroundColor(backColor);
    }

    /**
     * 設定View被按下時的背景色
     *
     * @param backColorPress
     */
    public void setBackColorPress(int backColorPress) {
        this.backColorPress = backColorPress;
    }

    /**
     * 設定icon的圖片
     *
     * @param iconDrawable
     */
    public void setIconDrawable(Drawable iconDrawable) {
        this.iconDrawable = iconDrawable;
        ivIcon.setImageDrawable(iconDrawable);
    }

    /**
     * 設定View被按下時的icon的圖片
     *
     * @param iconDrawablePress
     */
    public void setIconDrawablePress(Drawable iconDrawablePress) {
        this.iconDrawablePress = iconDrawablePress;
    }

    /**
     * 設定文字的顏色
     *
     * @param textColor
     */
    public void setTextColor(int textColor) {
        if (textColor == 0) return;
        this.textColor = ColorStateList.valueOf(textColor);
        tvContent.setTextColor(this.textColor);
    }

    /**
     * 設定View被按下時文字的顏色
     *
     * @param textColorPress
     */
    public void setTextColorPress(int textColorPress) {
        if (textColorPress == 0) return;
        this.textColorPress = ColorStateList.valueOf(textColorPress);
    }

    /**
     * 設定顯示的文字內容
     *
     * @param text
     */
    public void setText(CharSequence text) {
        //預設為隱藏的,設定文字後顯示出來
        tvContent.setVisibility(VISIBLE);
        tvContent.setText(text);
    }

    /**
     * 獲取顯示的文字
     *
     * @return
     */
    public String getText() {
        return tvContent.getText().toString();
    }

    /**
     * 設定文字字型大小
     *
     * @param size
     */
    public void setTextSize(float size) {
        tvContent.setTextSize(size);
    }

    /**
     * 設定兩個控制元件之間的間距
     *
     * @param spacing
     */
    public void setSpacing(int spacing) {
        this.spacing = ConvertM.dp2px(mContext, spacing);
        //設定完成後重新整理一下兩個控制元件的結構,避免先執行了setIconStyle後,setSpacing不生效
        setIconStyle(mStyle);
    }

}

程式碼註釋基本可以看懂具體的實現,接下來主要看下如何使用

在layout裡直接引用ButtonExtendM即可,注意要新增

    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"
            />

這個是實現的選單欄的返回按鈕,左右結構,icon在左為預設樣式,注意一下*Press的屬性,主要是用來設定控制元件被按下後的效果的。

再來看一個上下結構的

    <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="首頁"
            landptf:style="iconUp"
            />

只需要設定landptf:style即可,同時也可以通過java程式碼實現

    setIconStyle(ButtonExtendM.STYLE_ICON_UP)