Android自定义控件之自定义组合控件_android 自定义控件 merge

使用自定义组合控件的好处？

• 提高布局文件开发效率
• 降低布局文件维护成本
• 降低布局文件和Activity代码耦合性
• 容易扩展
• 简单易用

如何实现一个自定义组合控件

1.）先定义一个布局文件

<merge xmlns:android="http://schemas.android.com/apk/res/android">
 
    <Button
        android:id="@+id/title_bar_left"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="5dp"
        android:background="@null"
        android:minHeight="45dp"
        android:minWidth="45dp"
        android:textSize="14sp" />
 
    <TextView
        android:id="@+id/title_bar_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:singleLine="true"
        android:textSize="17sp" />
 
    <Button
        android:id="@+id/title_bar_right"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="7dp"
        android:background="@null"
        android:minHeight="45dp"
        android:minWidth="45dp"
        android:textSize="14sp" />
 
</merge>

注意：这里为何要使用merge标签，自定义组合控件时会继承RelativeLayout、LinearLayout等控件，这样导致布局的层级无形中增加了一层，如下是对比：

未使用merge标签

使用merge标签

2.）定义自定义属性

比如标题文字、标题栏左边按钮图标等。

<declare-styleable name="CustomTitleBar">
        <attr name="title_background_color" format="reference|integer" />
        <attr name="left_button_visible" format="boolean" />
        <attr name="right_button_visible" format="boolean" />
        <attr name="title_text" format="string" />
        <attr name="title_text_color" format="color" />
        <attr name="title_text_drawable" format="reference|integer" />
        <attr name="right_button_text" format="string" />
        <attr name="right_button_text_color" format="color" />
        <attr name="right_button_drawable" format="reference|integer" />
        <attr name="left_button_text" format="string" />
        <attr name="left_button_text_color" format="color" />
        <attr name="left_button_drawable" format="reference|integer" />
    </declare-styleable

  3.）自定义一个View根据需求继承不同的ViewGroup子类，比如：RelativeLayout、LinearLayout等，我们这里继承RelativeLayout。

public class CustomTitleBar extends RelativeLayout {
    private  Button titleBarLeftBtn;
    private Button titleBarRightBtn;
    private TextView titleBarTitle;
 
    public CustomTitleBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.custom_title_bar, this, true);
        titleBarLeftBtn = (Button) findViewById(R.id.title_bar_left);
        titleBarRightBtn = (Button) findViewById(R.id.title_bar_right);
        titleBarTitle = (TextView) findViewById(R.id.title_bar_title);
 
        TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.CustomTitleBar);
        if (attributes != null) {
            //处理titleBar背景色
            int titleBarBackGround = attributes.getResourceId(R.styleable.CustomTitleBar_tlb_title_background_color, Color.GREEN);
            setBackgroundResource(titleBarBackGround);
            //先处理左边按钮
            //获取是否要显示左边按钮
            boolean leftButtonVisible = attributes.getBoolean(R.styleable.CustomTitleBar_tlb_left_button_visible, true);
            if (leftButtonVisible) {
                titleBarLeftBtn.setVisibility(View.VISIBLE);
            } else {
                titleBarLeftBtn.setVisibility(View.INVISIBLE);
            }
            //设置左边按钮的文字
            String leftButtonText = attributes.getString(R.styleable.CustomTitleBar_tlb_left_button_text);
            if (!TextUtils.isEmpty(leftButtonText)) {
                titleBarLeftBtn.setText(leftButtonText);
                //设置左边按钮文字颜色
                int leftButtonTextColor = attributes.getColor(R.styleable.CustomTitleBar_tlb_left_button_text_color, Color.WHITE);
                titleBarLeftBtn.setTextColor(leftButtonTextColor);
            }
            //设置左边图片icon 这里是二选一 要么只能是文字 要么只能是图片
            int leftButtonDrawable = attributes.getResourceId(R.styleable.CustomTitleBar_tlb_left_button_drawable, R.mipmap.titlebar_back_icon);
            if (leftButtonDrawable != -1) {
                titleBarLeftBtn.setCompoundDrawablesWithIntrinsicBounds(leftButtonDrawable, 0, 0, 0);  //设置到哪个控件的位置（）
            }
 
 
            //处理标题
            //先获取标题是否要显示图片icon
            int titleTextDrawable = attributes.getResourceId(R.styleable.CustomTitleBar_tlb_title_text_drawable, -1);
            if (titleTextDrawable != -1) {
                titleBarTitle.setBackgroundResource(titleTextDrawable);
            } else {
                //如果不是图片标题 则获取文字标题
                String titleText = attributes.getString(R.styleable.CustomTitleBar_tlb_title_text);
                if (!TextUtils.isEmpty(titleText)) {
                    titleBarTitle.setText(titleText);
                }
                //获取标题显示颜色
                int titleTextColor = attributes.getColor(R.styleable.CustomTitleBar_tlb_title_text_color, Color.WHITE);
                titleBarTitle.setTextColor(titleTextColor);
            }
 
            //先处理右边按钮
            //获取是否要显示右边按钮
            boolean rightButtonVisible = attributes.getBoolean(R.styleable.CustomTitleBar_tlb_right_button_visible, true);
            if (rightButtonVisible) {
                titleBarRightBtn.setVisibility(View.VISIBLE);
            } else {
                titleBarRightBtn.setVisibility(View.INVISIBLE);
            }
            //设置右边按钮的文字
            String rightButtonText = attributes.getString(R.styleable.CustomTitleBar_tlb_right_button_text);
            if (!TextUtils.isEmpty(rightButtonText)) {
                titleBarRightBtn.setText(rightButtonText);
                //设置右边按钮文字颜色
                int rightButtonTextColor = attributes.getColor(R.styleable.CustomTitleBar_tlb_right_button_text_color, Color.WHITE);
                titleBarRightBtn.setTextColor(rightButtonTextColor);
            }
            //设置右边图片icon 这里是二选一 要么只能是文字 要么只能是图片
            int rightButtonDrawable = attributes.getResourceId(R.styleable.CustomTitleBar_tlb_right_button_drawable, -1);
            if (rightButtonDrawable != -1) {
                titleBarRightBtn.setCompoundDrawablesWithIntrinsicBounds(0, 0, rightButtonDrawable, 0);  //设置到哪个控件的位置（）
            }
            attributes.recycle();
        }
    }
 
    public void setTitleClickListener(OnClickListener onClickListener) {
        if (onClickListener != null) {
            titleBarLeftBtn.setOnClickListener(onClickListener);
            titleBarRightBtn.setOnClickListener(onClickListener);
        }
    }
 
    public Button getTitleBarLeftBtn() {
        return titleBarLeftBtn;
    }
 
    public Button getTitleBarRightBtn() {
        return titleBarRightBtn;
    }
 
    public TextView getTitleBarTitle() {
        return titleBarTitle;
    }
 
}

4.）在不同的XML布局中引用

关于如何使用自定义属性这里就不再说明了，为了更加直观的查看效果，我这里在一个布局文件中实现不同要求的标题栏

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:lee="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
 
    <com.whoislcj.views.CustomTitleBar
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_marginTop="10dp"
        lee:right_button_drawable="@mipmap/titlebar_add_icon"
        lee:title_background_color="@color/green"
        lee:title_text="标题1" />
 
    <com.whoislcj.views.CustomTitleBar
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_marginTop="10dp"
        lee:right_button_visible="false"
        lee:title_background_color="@color/green"
        lee:title_text="标题2" />
 
    <com.whoislcj.views.CustomTitleBar
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_marginTop="10dp"
        lee:left_button_text="左边"
        lee:right_button_text="右边"
        lee:title_background_color="@color/red"
        lee:title_text="标题3" />
 
    <com.whoislcj.views.CustomTitleBar
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_marginTop="10dp"
        lee:left_button_text="左边"
        lee:right_button_drawable="@mipmap/titlebar_add_icon"
        lee:title_background_color="@color/red"
        lee:title_text="标题4" />
 
    <com.whoislcj.views.CustomTitleBar
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_marginTop="10dp"
        lee:left_button_text="左边"
        lee:left_button_text_color="@color/red"
        lee:right_button_drawable="@mipmap/titlebar_add_icon"
        lee:title_background_color="@color/blue"
        lee:title_text="标题5" />
 
    <com.whoislcj.views.CustomTitleBar
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_marginTop="10dp"
        lee:left_button_text="左边"
        lee:left_button_text_color="@color/red"
        lee:right_button_drawable="@mipmap/titlebar_add_icon"
        lee:title_background_color="@color/blue"
        lee:title_text="标题6"
        lee:title_text_color="@color/black" />
 
</LinearLayout>

 显示效果：