Question

修改

嗨，我只是Java和Android开发的新手，我需要帮助从资产文件夹中获取图像，我已经尝试了很多方法来获得工作，但还没有运气。

这是我的文件夹详细信息结构

enter image description here

我使用Baker Android框架来创建我的应用程序。现在，我想要的是我想从image-bali文件夹调用图像1.jpg并将其传送到位图，我用这段代码来解码文件

Bitmap bitmap = BitmapFactory.decodeFile(assetManager + "/books/Individual Villas/images-bali/1.jpg", bitmapOptions);

这是我用于

的完整代码

  AssetManager assetManager = getResources().getAssets();
  String path = "assetManager + "/books/Individual Villas/images-bali/1.jpg";


  BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
  bitmapOptions.inDither = true;// optional
  bitmapOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;// optional
  Bitmap bitmap = BitmapFactory.decodeFile(path , bitmapOptions);

  Log.d("Test","Bitmap data " + bitmap);

当我加载代码时，它总是会崩溃我的应用。任何人都可以指导我如何做到这一点？

如果我能有详细的程序，我将不胜感激，谢谢。

Log-Cat：

07-31 16:17:15.694  12542-12542/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NullPointerException
            at com.baker.abaker.settings.Configuration.getFilesDirectory(Configuration.java:113)
            at com.baker.abaker.settings.Configuration.getMagazinesDirectory(Configuration.java:130)
            at com.baker.abaker.MagazineActivity$8.onClick(MagazineActivity.java:351)
            at android.view.View.performClick(View.java:4421)
            at android.view.View$PerformClick.run(View.java:18190)
            at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:175)
            at android.app.ActivityThread.main(ActivityThread.java:5279)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
            at dalvik.system.NativeStart.main(Native Method)
07-31 16:17:15.702      491-496/? E/SurfaceFlinger﹕ #### captureScreenImplLocked
07-31 16:17:16.046      519-571/? E/android.os.Debug﹕ !@Dumpstate > dumpstate -k -t -z -d -o /data/log/dumpstate_app_error
07-31 16:17:24.991      519-749/? E/Watchdog﹕ !@Sync 14914
07-31 16:17:46.343      519-571/? E/ViewRootImpl﹕ sendUserActionEvent() mView == null
07-31 16:17:46.515  12877-12877/? E/com.baker.abaker.GindActivity﹕ Could not load libraries: Couldn't load JavaScriptCore from loader dalvik.system.PathClassLoader[dexPath=/system/framework/android.test.runner.jar:/data/app/com.baker.abaker.test-1.apk,libraryPath=/data/app-lib/com.baker.abaker.test-1]: findLibrary returned null
07-31 16:17:46.694  12877-12877/? E/class com.baker.abaker.GindActivity﹕ USER ACCOUNT COULD NOT BE RETRIEVED, WILL USE ANDROID_ID.
07-31 16:17:46.710  12877-12877/? E/class com.baker.abaker.GindActivity﹕ No valid Google Play Services APK found.
07-31 16:17:47.991      491-496/? E/SurfaceFlinger﹕ #### captureScreenImplLocked
07-31 16:17:48.030     519-1773/? E/EnterpriseContainerManager﹕ ContainerPolicy Service is not yet ready!!!
07-31 16:17:48.163  12877-12877/? E/BitmapFactory﹕ Unable to decode stream: java.io.FileNotFoundException: /file:/android_asset/books/Individual Villas/images-bali/1.jpg: open failed: ENOENT (No such file or directory)
07-31 16:17:48.265  12877-12898/? E/dalvikvm﹕ adjustAdaptiveCoef max=4194304, min=1048576, ut=568
07-31 16:17:48.390  12877-12880/? E/dalvikvm﹕ adjustAdaptiveCoef max=6291456, min=1572864, ut=368
07-31 16:17:48.530      519-882/? E/EnterpriseContainerManager﹕ ContainerPolicy Service is not yet ready!!!
07-31 16:17:50.421  12877-12877/? E/Web Console﹕ Uncaught TypeError: Cannot read property 'top' of null:1073
07-31 16:17:50.718  12877-12877/? E/Web Console﹕ Uncaught TypeError: Cannot read property 'top' of null:1073
07-31 16:17:54.991      519-749/? E/Watchdog﹕ !@Sync 14915

Answer 1

删除getResources（）。

    AssetManager assetManager =getAssets();

 Bitmap bitmap = BitmapFactory.decodeFile(assetManager+"/books/IndividualVillas/images-bali/1.jpg");
 Bitmap dest = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);

还会删除文件夹名称

上的空格

Answer 2

你应该做的第一件事就是改变文件夹的名称...... 使用_（下划线）代替白色空格或 - （破折号）......

然后.... 尝试使用此代码获取文件...

AssetManager assetManager = getAssets();
    InputStream istr = null;
    try {
        istr = assetManager.open("books/IndividualVillas/images_bali/1.jpg");
    } catch (IOException e) {
        e.printStackTrace();
    }
    Bitmap bitmap = BitmapFactory.decodeStream(istr);
    return bitmap;

Answer 3

您不能在assets文件夹的路径中使用空格。无法解码流：java.io.FileNotFoundException：/ file：/ android_asset / books / Individual Villas / images-bali / 1.jpg：open failed：ENOENT（没有这样的文件或目录）

Answer 4

您应该将其保存为drawable，因为您可以从输入流中获取可绘制对象。使用输入流来获取您的评估。像这样：

try {
        InputStream stream = context.getAssets().open("path/image.jpg");
        Drawable d = Drawable.createFromStream(stream, null);
        yourImageview.setImageDrawable(d);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

来源：https://xjaphx.wordpress.com/2011/10/02/store-and-use-files-in-assets/

Answer 5

将您的资源文件夹引用保存到根目录，目前已根据您的＆＃34; src / main＆＃34; 执行此操作复制您的＆＃34;资产文件夹＆＃ 34; 并右键单击根目录意味着＆＃34; ABaker＆＃34;并粘贴它。之后从＆＃34; src / main＆＃34; 中删除资产文件夹并应用此代码。

try {
        // get input stream
        InputStream is = getAssets().open(
                "/books/Individual Villas/images-bali/1.jpg");
        // load image as Drawable
        Drawable d = Drawable.createFromStream(is, null);
        // set image to ImageView
        img_view.setImageDrawable(d);
    } catch (IOException ex) {

    }

如何从android资产中获取图像

5 个答案: