android – BottomSheetDialog背景闪烁

在应用程序之间切换时,BottomSheetDialog的背景闪烁.我究竟做错了什么 ？

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        findViewById(R.id.btn1).setOnClickListener(v -> {
            BottomSheetDialog bottomSheetDialog = new BottomSheetDialog(MainActivity.this);
            bottomSheetDialog.setContentView(R.layout.content);
            bottomSheetDialog.show();
        });
    }
}

activity_main.xml中

<?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"
   tools:context=".MainActivity">

    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

content.xml文件

<?xml version="1.0" encoding="utf-8"?>
<View 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="300dp"
    android:background="#F00" />

AndroidManifest.xml中

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.holtaf.testandroidapplication">

    <application
        android:allowBackup="true"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.AppCompat.Light.DarkActionBar">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我的appcompat版本是27.1.1.

解决方法:

闪烁的主要原因是BottomSheetDialog的默认样式,它定义了默认的animation和dim行为.

我们可以通过使用bottomSheetDialogTheme定义自定义主题来解决上述问题：

>通过将windowAnimationStyle设置为@null,禁用BottomSheet的默认窗口动画.
>将backgroundDimEnabled属性设置为false.

例：

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>

    <item name="bottomSheetDialogTheme">@style/AppTheme.BottomSheetDialog</item>
</style>

<style name="AppTheme.BottomSheetDialog" parent="Theme.Design.BottomSheetDialog">
    <item name="android:windowAnimationStyle">@null</item>
    <item name="android:backgroundDimEnabled">false</item>

    <!-- optional -->
    <item name="android:windowBackground">#99323232</item> 
</style>

标签：android,bottom-sheet
来源： https://codeday.me/bug/20190910/1801795.html