Android矢量可绘制应用程序:srcCompat不显示图像 [英] Android vector drawable app:srcCompat not showing images

问题描述

我正在使用支持库在android kitkat上显示矢量图像.当我在模拟器上测试我的应用程序时，我看不到任何这些图像.我为Android Lollipop及更高版本制作了单独的布局，并且运行良好(我认为是因为我使用的是src属性而不是srcCompat这是我在USign支持库中使用的代码

I'm using support library to show vector images on android kitkat. When I test my app on emulater I don't see any of these images. I made a separate layout for android lollipop and above and it workd perfectly (I think because I'm using src attribute instead of srcCompatHere's the code where I'm usign support library

<LinearLayout android:layout_alignParentBottom="true"
android:id="@+id/lake_detail"
android:background="@drawable/my_fishing_plan_footer_line"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="90dp"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">

<RelativeLayout
            android:layout_marginRight="3dp"
            android:id="@+id/fire_logo"
            android:layout_width="20sp"
            android:layout_height="20sp">

            <ImageView
                android:tint="#d74313"
                app:srcCompat="@drawable/circle_icon"
                android:layout_width="30sp"
                android:layout_height="30sp" />

            <ImageView
                android:layout_centerVertical="true"
                android:layout_centerHorizontal="true"
                app:srcCompat="@drawable/lauzaviete"
                android:layout_width="25dp"
                android:layout_height="25dp" />

        </RelativeLayout>

而且很奇怪，因为我在android studio预览窗口中看到了图像.

and it's strange because I see the images on android studio preview window.

推荐答案

原始答案

在布局中使用android.support.v7.widget.AppCompatImageView而不是ImageView，

<LinearLayout 
  ...
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto">

  <android.support.v7.widget.AppCompatImageView
    android:tint="#d74313"
    app:srcCompat="@drawable/circle_icon"
    android:layout_width="30sp"
    android:layout_height="30sp" />

  <android.support.v7.widget.AppCompatImageView
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true"
    app:srcCompat="@drawable/lauzaviete"
    android:layout_width="25dp"
    android:layout_height="25dp" />
</LinearLayout>

请参见AppCompatImageView文档此处和app:srcCompat 此处.

设置您的build.gradle

Setup your build.gradle

android {
  defaultConfig {
    vectorDrawables {
      useSupportLibrary = true
    }
  }
}

文档: 用AppCompatActivity

Extend your Activity with AppCompatActivity

public final class MainActivity extends AppCompatActivity {    
  @Override protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);
  }
}

使用app:srcCompat时，请确保布局中具有正确的声明:

When using app:srcCompat, make sure to have the correct declarations in your layout:

<LinearLayout 
  ...
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto">
  ...
</LinearLayout>

可选(警告:请阅读文档):Application类中的setCompatVectorFromResourcesEnabled

Optional (warning: please read docs): setCompatVectorFromResourcesEnabled in your Application class

public class App extends Application {

  @Override public void onCreate() {
    super.onCreate();

    // Make sure we use vector drawables
    AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
  }
}

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