将一个Activity转变成dialog

主要是在style文件中的设置

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>
    <style name="dialog_style" parent="Theme.AppCompat.Dialog">

        <!--是否悬浮在activity上-->
        <item name="android:windowIsFloating">true</item>
        <!--透明是否-->
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:background">#82858b</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowAnimationStyle">@style/animation_style</item>
    </style>
    <!--给dialog添加的动画效果,可选-->
    <style name="animation_style" parent="Animation.AppCompat.Dialog">
        <item name="android:windowEnterAnimation">@anim/window_inter</item>
        <item name="android:windowExitAnimation">@anim/window_exist</item>
    </style>
</resources>

并且在清单文件中引用

 </activity>
<activity android:name=".DialogActivity"
android:theme="@style/dialog_style">

</activity>

效果如图