Android – DataBinding 自定义setter

在APP中我们经常会遇到下面的UI

图片来源于今日头条APP个人中心界面的截图

下面咱们进入主题正式介绍如何使用databinding来自定义setter。
先上效果图：

databinding自定义setter
自定义View布局文件setting_view_layout .xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
                                             xmlns:app="http://schemas.android.com/apk/res-auto"
                                            xmlns:tools="http://schemas.android.com/tools"
                                             android:layout_width="match_parent"
                                             android:layout_height="72dp">

    <ImageView
        android:id="@+id/id_iv_icon"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:src="@mipmap/ic_launcher"/>

    <TextView
        android:id="@+id/id_tv_title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="12dp"
        app:layout_constraintBottom_toBottomOf="@+id/id_iv_icon"
        app:layout_constraintLeft_toRightOf="@+id/id_iv_icon"
        app:layout_constraintTop_toTopOf="@+id/id_iv_icon"
        tools:text="标题"/>

    <TextView
        android:id="@+id/id_tv_hint"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginRight="12dp"
        app:layout_constraintBottom_toBottomOf="@+id/id_iv_arrow"
        app:layout_constraintRight_toLeftOf="@+id/id_iv_arrow"
        app:layout_constraintTop_toTopOf="@+id/id_iv_arrow"
        tools:text="提示"/>

    <ImageView
        android:id="@+id/id_iv_arrow"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_marginRight="16dp"
        app:layout_constraintBottom_toBottomOf="@+id/id_iv_icon"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@+id/id_iv_icon"
        tools:src="@mipmap/go_icon"/>

    <View
        android:id="@+id/id_view_line1"
        android:layout_width="0dp"
        android:layout_height="0.5dp"
        app:layout_constraintBottom_toBottomOf="parent"
        tools:background="#d71345"/>


    <View
        android:id="@+id/id_view_line2"
        android:layout_width="0dp"
        android:layout_height="0.5dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        tools:background="#d71345"/>


</android.support.constraint.ConstraintLayout>

效果如下：

图是在xml中截取的

自定义View代码：

public class SetterView extends ConstraintLayout {
    private ImageView mIvIcon;
    private TextView mTvTitle;
    private TextView mTvHint;
    private ImageView mIvArrow;
    private View mLine1;
    private View mLine2;

    public SetterView(Context context) {
        this(context, null);
    }

    public SetterView(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

    public SetterView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView(context);
    }

    private void initView(Context context){
        View view = LayoutInflater.from(context).inflate(R.layout.setting_view_layout, this);
        mIvIcon = (ImageView) view.findViewById(R.id.id_iv_icon);
        mTvTitle = (TextView) view.findViewById(R.id.id_tv_title);
        mTvHint = (TextView) view.findViewById(R.id.id_tv_hint);
        mIvArrow = (ImageView) view.findViewById(R.id.id_iv_arrow);
        mLine1 = view.findViewById(R.id.id_view_line1);
        mLine2 = view.findViewById(R.id.id_view_line2);
    }

    public void setIcon(Drawable resId){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            mIvIcon.setBackground(resId);
        }else{
            mIvIcon.setBackgroundDrawable(resId);
        }
    }

    public void setTitle(String title){
        mTvTitle.setText(title);
    }

    public void setHint(String hint){
        mTvHint.setText(hint);
    }

    public void setArrowVisible(Drawable resId){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            mIvArrow.setBackground(resId);
        }else{
            mIvArrow.setBackgroundDrawable(resId);
        }
    }


    /**
     * 有margin的line
     * @param colorId
     */
    public void setLine2Visible(int colorId){
        mLine1.setVisibility(View.GONE);
        mLine2.setBackgroundColor(colorId);
    }

    /**
     * match_parent的line
     * @param colorId
     */
    public void setLine1Visible(int colorId){
        mLine1.setBackgroundColor(colorId);
        mLine2.setVisibility(View.GONE);
    }
}

在Activity的activity_attr_setter_layout .xml中使用：

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
    >

    <data class="AttrBind">

    </data>

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <cn.custom.widget.widget.SetterView
            android:id="@+id/id_set_1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:icon="@{@drawable/phone}"
            app:title="@{@string/s_phone}"
            app:hint="@{@string/s_phone_hint}"
            app:arrowVisible="@{@drawable/go_icon}"
            app:line2Visible="@{@color/c_d71345}"
           />

        <cn.custom.widget.widget.SetterView
            android:id="@+id/id_set_2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/id_set_1"
            app:layout_constraintRight_toRightOf="parent"
            app:icon="@{@drawable/phone}"
            app:title="@{@string/s_phone}"
            app:hint="@{@string/s_phone_hint}"
            app:arrowVisible="@{@drawable/go_icon}"
            app:line2Visible="@{@color/c_d71345}"
            />

        <cn.custom.widget.widget.SetterView
            android:id="@+id/id_set_3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/id_set_2"
            app:icon="@{@drawable/phone}"
            app:title="@{@string/s_phone}"
            app:hint="@{@string/s_phone_hint}"
            app:arrowVisible="@{@drawable/go_icon}"
            app:line2Visible="@{@color/c_d71345}"
            />

        <cn.custom.widget.widget.SetterView
            android:id="@+id/id_set_4"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/id_set_3"
            app:icon="@{@drawable/phone}"
            app:title="@{@string/s_phone}"
            app:hint="@{@string/s_phone_hint}"
            app:arrowVisible="@{@drawable/go_icon}"
            app:line2Visible="@{@color/c_d71345}"
            />

        <cn.custom.widget.widget.SetterView
            android:id="@+id/id_set_5"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/id_set_4"
            app:setIcon="@{@drawable/phone}"
            app:setTitle="@{@string/s_phone}"
            app:hint="@{@string/s_phone_hint}"
            app:arrowVisible="@{@drawable/go_icon}"
            app:line1Visible="@{@color/c_d71345}"/>

    </android.support.constraint.ConstraintLayout>

</layout>

activity中的代码：

public class AttributeSettersActivity extends AppCompatActivity {

    private AttrBind mAttrBind;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAttrBind=DataBindingUtil.setContentView(this,R.layout.activity_attr_setter_layout);     
    }
}

app:setIcon="@{@drawable/phone}"
和
app:icon="@{@drawable/phone}"
是等价的。
如何使用根据自己的习惯来吧。

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