如何製作半透明佈局？

Question

我試圖做出半透明的佈局，但不起作用，有人可以幫助我嗎？

這裏是我的清單：

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

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity android:name=".Text" /> 
     <activity 
      android:name=".InfoActivity" 
      android:theme="@android:style/Theme.Translucent"/> 
    </application> 

</manifest> 

這裏是我的活動佈局：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/main_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.vratsasoftware.tito.texteditor.InfoActivity" 
    android:background="#50ffffff"> 

    <RelativeLayout 
     android:id="@+id/relativeLayout" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_gravity="center" 
     android:layout_marginTop="85dp"> 

     <TextView 
      android:id="@+id/textView_title" 
      android:layout_width="250dp" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_alignParentTop="true" 
      android:layout_gravity="center" 
      android:background="@android:color/darker_gray" 
      android:text="Large Text" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:textColor="#ffffff" /> 

     <TextView 
      android:id="@+id/definition" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignEnd="@+id/textView_title" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_alignRight="@+id/textView_title" 
      android:layout_below="@+id/textView_title" 
      android:layout_marginTop="2dp" 
      android:background="@android:color/darker_gray" 
      android:text="Definition:" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:textColor="@android:color/white" /> 

     <TextView 
      android:id="@+id/textView_definition" 
      android:layout_width="wrap_content" 
      android:layout_height="150dp" 
      android:layout_alignEnd="@+id/definition" 
      android:layout_alignLeft="@+id/definition" 
      android:layout_alignRight="@+id/definition" 
      android:layout_alignStart="@+id/definition" 
      android:layout_below="@+id/definition" 
      android:layout_marginBottom="2dp" 
      android:allowUndo="true" 
      android:background="@android:color/darker_gray" 
      android:text="New Text" 
      android:textColor="#ffffff" /> 

     <Button 
      android:id="@+id/button_change" 
      style="?android:attr/borderlessButtonStyle" 
      android:layout_width="60dp" 
      android:layout_height="wrap_content" 
      android:layout_alignEnd="@+id/textView_definition" 
      android:layout_alignRight="@+id/textView_definition" 
      android:layout_below="@+id/textView_definition" 
      android:layout_gravity="right" 
      android:layout_marginLeft="2dp" 
      android:allowUndo="true" 
      android:background="@android:color/darker_gray" 
      android:foreground="@drawable/ic_action" /> 

     <EditText 
      android:id="@+id/editText_replace" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignBottom="@+id/button_change" 
      android:layout_alignLeft="@+id/textView_definition" 
      android:layout_alignStart="@+id/textView_definition" 
      android:layout_below="@+id/textView_definition" 
      android:layout_toLeftOf="@+id/button_change" 
      android:layout_toStartOf="@+id/button_change" 
      android:background="@android:color/darker_gray" 
      android:hint="Enter word for replace" 
      android:textColor="#ffffff" 
      android:textColorHint="#ffffff" /> 

     <Button 
      android:id="@+id/button_cancel" 
      style="?android:attr/buttonStyleSmall" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignEnd="@+id/button_change" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_alignRight="@+id/button_change" 
      android:layout_below="@+id/button_change" 
      android:layout_marginTop="2dp" 
      android:background="@android:color/darker_gray" 
      android:foreground="@android:drawable/ic_delete" 
      android:foregroundGravity="center_horizontal" /> 


    </RelativeLayout> 


</RelativeLayout> 

後，我啓動它停止活動，這是錯誤：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.vratsasoftware.tito.texteditor/com.vratsasoftware.tito.texteditor.InfoActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. 

Answer 1

更改您的Menifest文件：

更改以下行

<activity 
     android:name=".InfoActivity" 
     android:theme="@android:style/Theme.Translucent"/> 

TO：

<activity 
     android:name=".InfoActivity" 
     android:theme="@style/Base.TextAppearance.AppCompat"/> 

Answer 2

我希望這可以幫助你 讓你在Java代碼 想要佈局的ID，然後佈局的不透明度設置爲低數字