如何减小应用程序的大小？

Question

在我的应用程序中，我使用 54 个图像。为了支持多个屏幕，我创建了这样的文件夹

drawable-hdpi
drawable-mdpi
drawable-xdpi
drawable-mdpi

并粘贴每个文件夹中的所有图像。因此，应用程序大小增加了很多.... 然后我试着喜欢这种方式...... 只取一个文件夹 drawable 保留所有 54 个图像，删除所有 drawabl-mdpi、drawable-hdpi、drawable-mdpi 和 drawable-xdpi 文件夹。 在我的清单文件中，我提到了

"<supports-screens 
android:anyDensity="true" 
android:largeScreens="true" 
android:normalScreens="true" 
android:resizeable="true" 
android:smallScreens="true" />"

但它给了我这样的错误

07-25 15:04:25.928: ERROR/dalvikvm-heap(13963): 2764800-byte external allocation too large for this process.
07-25 15:04:25.928: ERROR/GraphicsJNI(13963): VM won't let us allocate 2764800 bytes
07-25 15:04:25.928: DEBUG/AndroidRuntime(13963): Shutting down VM
07-25 15:04:25.928: WARN/dalvikvm(13963): threadid=1: thread exiting with uncaught exception (group=0x4001d7e0)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963): FATAL EXCEPTION: main
07-25 15:04:25.967: ERROR/AndroidRuntime(13963): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jacksonville.alenseventapp/com.jacksonville.alenseventapp.HomeActivity}: android.view.InflateException: Binary XML file line #1: Error inflating class <unknown>
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.os.Looper.loop(Looper.java:123)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.app.ActivityThread.main(ActivityThread.java:4627)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at java.lang.reflect.Method.invokeNative(Native Method)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at java.lang.reflect.Method.invoke(Method.java:521)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at dalvik.system.NativeStart.main(Native Method)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963): Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class <unknown>
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.LayoutInflater.createView(LayoutInflater.java:513)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.LayoutInflater.inflate(LayoutInflater.java:385)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.app.Activity.setContentView(Activity.java:1647)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at com.jacksonville.alenseventapp.HomeActivity.onCreate(HomeActivity.java:12)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     ... 11 more
07-25 15:04:25.967: ERROR/AndroidRuntime(13963): Caused by: java.lang.reflect.InvocationTargetException
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.widget.LinearLayout.<init>(LinearLayout.java:115)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at java.lang.reflect.Constructor.constructNative(Native Method)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at java.lang.reflect.Constructor.newInstance(Constructor.java:446)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.LayoutInflater.createView(LayoutInflater.java:500)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     ... 21 more
07-25 15:04:25.967: ERROR/AndroidRuntime(13963): Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.graphics.Bitmap.nativeCreate(Native Method)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.graphics.Bitmap.createBitmap(Bitmap.java:468)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.graphics.Bitmap.createBitmap(Bitmap.java:435)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:340)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:488)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:462)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:323)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.content.res.Resources.loadDrawable(Resources.java:1709)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.content.res.TypedArray.getDrawable(TypedArray.java:601)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.View.<init>(View.java:1885)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.View.<init>(View.java:1834)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     at android.view.ViewGroup.<init>(ViewGroup.java:285)
07-25 15:04:25.967: ERROR/AndroidRuntime(13963):     ... 25 more

如果有人知道这件事请帮助我...

Answer 1

您的应用程序中有四个主要错误

java.lang.RuntimeException: Unable to start activity 
   **ComponentInfo{com.jacksonville.alenseventapp/com.
   jacksonville.alenseventapp.HomeActivity}:

和

** android.view.InflateException: Binary XML file line #1:
       Error inflating class <unknown>
       07-25 15:04:25.967: ERROR/AndroidRuntime(13963):    
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
        and 07-25 15:04:25.967: ERROR/AndroidRuntime(13963): Caused by: 
        android.view.InflateException: Binary XML file line #1: 
        Error inflating class <unknown>

这两个错误表明你指的是一个不存在的包 这可能是由于您遵循执行此代码的教程， 您在应用程序中使用了该代码的包名称

第三个错误

    07-25 15:04:25.967: ERROR/AndroidRuntime(13963): Caused by: 
java.lang.reflect.InvocationTargetException

看到这些问题也有同样的问题

How to remove this error ? java.lang.reflect.InvocationTargetException

InvocationTargetException on inflating an xml - android

也看到了这个

http://developer.android.com/reference/java/lang/reflect/InvocationTargetException.html

这是内存不足造成的

Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget

为避免这种情况，您可以使用此方法显示

// here path is from  where you are picking the image 



Bitmap myBitmap = ShrinkBitmap(Path, 300, 300);

MyImageView.setImageBitmap(myBitmap );


private Bitmap ShrinkBitmap(String file, int width, int height) {
        // TODO Auto-generated method stub
        BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
        bmpFactoryOptions.inJustDecodeBounds = true;
        Bitmap bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);

        int heightRatio = (int)Math.ceil(bmpFactoryOptions.outHeight/(float)height);
        int widthRatio = (int)Math.ceil(bmpFactoryOptions.outWidth/(float)width);

        if (heightRatio > 1 || widthRatio > 1)
        {
         if (heightRatio > widthRatio)
         {
          bmpFactoryOptions.inSampleSize = heightRatio;
         } else {
          bmpFactoryOptions.inSampleSize = widthRatio;
         }
        }

        bmpFactoryOptions.inJustDecodeBounds = false;
        bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);
     return bitmap;
    }

Answer 2

http://developer.android.com/training/displaying-bitmaps/index.html 看起来可能对您有所帮助。

https://stackoverflow.com/a/8251471/229631 详细介绍了如何在不耗尽内存的情况下加载位图。

Answer 3

Google I/O 2011: Memory management for Android Apps - 这个视频非常值得花时间观看。您将学到很多关于位图和内存管理的知识。