Android开发靠标题栏的弹框

一、效果图

title_dialog.png

二、思路

首先它是一个弹框，只是弹框的布局做些处理，布局占满屏幕，只有需要白色的布局的背景设为白色。其他没设置背景颜色，自然用dialog的style的windowBackground

三、案例关键代码

dialog的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="match_parent">


<android.support.constraint.ConstraintLayout
    android:id="@+id/cl_dialog_content"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="50dp"
    android:background="@color/m_white"
    app:layout_constraintTop_toTopOf="parent">

    <ImageView
        android:id="@+id/iv_select_active"
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:scaleType="centerCrop"
        android:src="@mipmap/icon_sel_l"
        android:visibility="invisible"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tv_select_active"
        style="@style/tv_w_w_s16_c_33_bold"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:gravity="center_vertical"
        android:paddingLeft="16dp"
        android:text="@string/active"
        app:layout_constraintBottom_toTopOf="@id/view_line"
        app:layout_constraintLeft_toRightOf="@id/iv_select_active"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <View
        android:id="@+id/view_line"
        android:layout_width="0dp"
        android:layout_height="1px"
        android:layout_marginTop="16dp"
        android:background="@color/c_f2efef"
        app:layout_constraintLeft_toLeftOf="@id/iv_select_active"
        app:layout_constraintTop_toBottomOf="@id/iv_select_active" />

    <ImageView
        android:id="@+id/iv_select_task"
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginBottom="16dp"
        android:scaleType="centerCrop"
        android:src="@mipmap/icon_sel_l"
        android:visibility="invisible"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@id/view_line" />

    <TextView
        android:id="@+id/tv_select_task"
        style="@style/tv_w_w_s16_c_33_bold"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:gravity="center_vertical"
        android:paddingLeft="16dp"
        android:text="@string/task"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toRightOf="@id/iv_select_task"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/view_line" />

</android.support.constraint.ConstraintLayout>

<View
    android:id="@+id/view_empty"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    app:layout_constraintTop_toBottomOf="@id/cl_dialog_content"
    app:layout_constraintBottom_toBottomOf="parent"
    />
</android.support.constraint.ConstraintLayout>

java代码：

fun showSelectActiveOrTask(context:Context,currentSelect:String,listener: DialogClickBackListener<String>?){

    var dialog = getCancelDialog(context)
    val window = dialog.window
    window.setGravity(Gravity.TOP)
    window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
    window.setContentView(R.layout.dialog_active_task_select)

    val ivSelectActive = window.findViewById<ImageView>(R.id.iv_select_active)
    val tvSelectActive = window.findViewById<TextView>(R.id.tv_select_active)
    val ivSelectTask = window.findViewById<ImageView>(R.id.iv_select_task)
    val tvSelectTask = window.findViewById<TextView>(R.id.tv_select_task)
    val view_empty = window.findViewById<View>(R.id.view_empty)

    if (currentSelect == "活动"){
        ivSelectActive.visibility = View.VISIBLE
    } else {
        ivSelectTask.visibility = View.VISIBLE
    }

    view_empty.setOnClickListener {
        listener?.onClickBack(currentSelect)
        dialog.dismiss()
    }

    //活动
    ivSelectActive.setOnClickListener {
        listener?.onClickBack("活动")
        dialog.dismiss()
    }
    tvSelectActive.setOnClickListener {
        listener?.onClickBack("活动")
        dialog.dismiss()
    }

    //任务
    ivSelectTask.setOnClickListener {
        listener?.onClickBack("任务")
        dialog.dismiss()
    }
    tvSelectTask.setOnClickListener {
        listener?.onClickBack("任务")
        dialog.dismiss()
    }

}

其中：

private fun getCancelDialog(context:Context): Dialog {
    return AlertDialog.Builder(context, R.style.mydialog).setCancelable(true).show()
}

<style name="mydialog" parent="@android:style/Theme.Dialog">
    <item name="android:windowFrame">@null</item><!--边框-->
    <item name="android:windowIsFloating">true</item><!--是否浮现在activity之上-->
    <item name="android:windowIsTranslucent">false</item><!--半透明-->
    <item name="android:windowNoTitle">true</item><!--无标题-->
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:backgroundDimEnabled">true</item><!--模糊-->
    <item name="android:backgroundDimAmount">0.6</item>
</style>

四、总结

关键是布局，dialog的style