自定义Dialog Theme的Activity

背景

最近公司开发NFC开门的功能，咋一眼看功能很简单，直接用Dialog方式封装就能解决问题。但是我们公司是模块化的方式搭建开发App，为了让模块间的代码层次清晰与扩展及易与阅读，因此我们最终用Activity的方式实现Dialog的样式及功能。

dialog1
dialog2

以下的开发过程以dialog1图片举例说明

开发过程

1.创建Theme样式

<style name="activityTransparentTheme" parent="@style/AppTheme.NoActionBar">
   <item name="android:windowFrame">@null</item> <!-- 无windowFrame -->
   <item name="android:windowIsFloating">true</item>  <!-- 浮在activity之上 -->
   <item name="android:windowIsTranslucent">false</item>  <!-- 半透明 -->
   <item name="android:windowNoTitle">true</item> <!-- 隐藏标题 -->
   <item name="windowNoTitle">true</item> <!-- 隐藏标题 -->
   <item name="android:background">@android:color/transparent</item>
   <item name="android:windowBackground">@android:color/transparent</item> <!-- 设置系统给定的透明值 -->
   <item name="android:backgroundDimEnabled">true</item>  <!-- 背景是否变暗-->
   <item name="android:windowAnimationStyle">@style/AnimationFade</item>
   </style>   <!-- activity显示方式 -->

1、如果继承的Activity是AppCompatActivity，需要用@style/AppTheme XX的样式
2、如果阴影部分出现文字，用windowNoTitle和android:windowNoTitle设置为True即可

扩展：1.windowNoTitle = false 并且 android:windowNoTitle = false 时，会出现两个标题，位于下方的是AppCompatActivity的标题栏。
2.windowNoTitle = true并且 android:windowNoTitle = true时 ,无标题。

2.创建Activity动画

 <style name="AnimationFade" parent="@android:style/Animation.Activity">
     <item name="android:activityOpenEnterAnimation">@anim/fade_in</item>
     <item name="android:activityOpenExitAnimation">@anim/fade_out</item>
     <item name="android:activityCloseEnterAnimation">@anim/fade_in</item>
     <item name="android:activityCloseExitAnimation">@anim/fade_out</item>
 </style>

2.1 淡出淡入动画

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
       android:duration="200"
       android:fillAfter="true"
       android:fromAlpha="0"
       android:toAlpha="1"/>

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
       android:duration="200"
       android:fillAfter="true"
       android:fromAlpha="1"
       android:toAlpha="0"/>

3.创建自定义Dialog实现

3.1 layout布局

  <LinearLayout
        android:id="@+id/content_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginEnd="24dp"
        android:layout_marginStart="24dp"
        android:background="@drawable/common_rounded_dialog_bg"
        android:orientation="vertical"
        android:paddingBottom="32dp"
        android:paddingEnd="16dp"
        android:paddingStart="16dp"
        android:paddingTop="32dp">

        <TextView
            android:id="@+id/tv_message"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="@color/colorBlack"
            android:textSize="@dimen/size_p2"/>

        <TextView
            android:id="@+id/tv_confirm"
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:layout_marginTop="32dp"
            android:background="@drawable/btn_black_shape_25"
            android:gravity="center"
            android:textColor="@color/colorWhite"
            android:textStyle="bold"/>

    </LinearLayout>

3.1.1 btn_black_shape_25.xml

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

    <corners android:radius="25dp" />
    <solid android:color="@color/colorBlack"/>
</shape>

3.1.2 common_rounded_dialog_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <corners
        android:radius="15dp" />

    <gradient
        android:endColor="@android:color/white"
        android:startColor="@android:color/white" />
</shape>

3.2 activity实现

在实现全屏显示Dialog显示时，一定要注意适配Android 8.0，网络上上大多说“删除AndroidManifest.xml中相应Activity的 android:screenOrientation=""属性；或者删除相应Activity的android:theme=""属性中对应style中<item name="android:windowIsTranslucent">true</item>属性”，我认为使用Hook方式优雅绕过检查来实现效果会更好。

class UnlockDoorActivity : BaseDataBindingActivity() {

    var hasFinishView = true

    override fun onCreate(savedInstanceState: Bundle?) {
        <!-- Hook方式 解决Android8.0 的bug  -->
        ActivityHook.hookOrientation(this)
        super.onCreate(savedInstanceState)

        val windowManager: WindowManager? = this.windowManager
        val display: Display? = windowManager?.defaultDisplay
        val lp = this.window?.attributes
        lp?.width = display?.width
        lp?.gravity = Gravity.BOTTOM
        this.window?.attributes = lp
    }

   ....
    override val layoutId: Int = R.layout.activity_unlock_door
   ....

    override fun finish() {
        super.finish()
        //activity消失时的动画
        overridePendingTransition(R.anim.fade_in, R.anim.fade_out)
    }
}

3.2.2 ActivityHook.java

/**
 * http://www.manongjc.com/article/37655.html
 */
public class ActivityHook {

  /**
   * java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation
   * <p>
   * 修复android 8.0存在的问题
   * <p>
   * 在Activity中onCreate()中super之前调用
   *
   * @param activity Activity
   */
  public static void hookOrientation(Activity activity) {
    //目标版本8.0及其以上
    if (activity.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.O) {
      if (isTranslucentOrFloating(activity)) {
        fixOrientation(activity);
      }
    }
  }

  /**
   * 设置屏幕不固定，绕过检查
   *
   * @param activity Activity
   */
  private static void fixOrientation(Activity activity) {
    try {
      Class<Activity> activityClass = Activity.class;
      Field mActivityInfoField = activityClass.getDeclaredField("mActivityInfo");
      mActivityInfoField.setAccessible(true);
      ActivityInfo activityInfo = (ActivityInfo) mActivityInfoField.get(activity);
      //设置屏幕不固定
      activityInfo.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * 检查屏幕 横竖屏或者锁定就是固定
   *
   * @param activity Activity
   * @return true
   */
  private static boolean isTranslucentOrFloating(Activity activity) {
    boolean isTranslucentOrFloating = false;
    try {
      Class<?> styleableClass = Class.forName("com.android.internal.R$styleable");
      Field WindowField = styleableClass.getDeclaredField("Window");
      WindowField.setAccessible(true);
      int[] styleableRes = (int[]) WindowField.get(null);
      //先获取到TypedArray
      final TypedArray typedArray = activity.obtainStyledAttributes(styleableRes);
      Class<?> ActivityInfoClass = ActivityInfo.class;
      //调用检查是否屏幕旋转
      Method isTranslucentOrFloatingMethod = ActivityInfoClass.getDeclaredMethod("isTranslucentOrFloating", TypedArray.class);
      isTranslucentOrFloatingMethod.setAccessible(true);
      isTranslucentOrFloating = (boolean) isTranslucentOrFloatingMethod.invoke(null, typedArray);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return isTranslucentOrFloating;
  }
}

参考

android 8.0 Only fullscreen opaque activities can request orientation（Hook方式优雅绕过检查 ）