java – 内存异常分析hprof文件转储

发布时间：2020-12-15 00:48:26 所属栏目：Java 来源：网络整理

导读：这是与这个问题有关的 java.lang.OutOfMemoryError at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) 我创建了有问题的转储文件..它提供以下信息 One instance of "byte[]" loaded by "system class loader" occupies 1,10,59,216(51.02

这是与这个问题有关的

java.lang.OutOfMemoryError at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)

我创建了有问题的转储文件..它提供以下信息

One instance of "byte[]" loaded by "<system class loader>" occupies 1,10,59,216
(51.02%) bytes. The memory is accumulated in one instance of "byte[]" 
 loaded by "<system class loader>".

Keywords byte[]

那么现在可以做什么呢？我如何清除问题？

我的list_objects [context] -inbound文件

CLASS NAME                                                                 SHALLOW HEAP   RETAINED HEAP  
byte[11059200] @ 0xb4979590                                               |  1,216 |   1,216
mBuffer android.graphics.Bitmap @ 0xb3dc68d8                              |48            | 48
mBitmap android.graphics.drawable.BitmapDrawable @ 0xb3dbba60             | 72           | 144
mBackground android.widget.RelativeLayout @ 0xb3db3fc0                    |512           | 10,144
mBitmap android.graphics.drawable.BitmapDrawable$BitmapState @ 0xb3dc0068 |40          | 40
mBitmapState android.graphics.drawable.BitmapDrawable @ 0xb3dbba60        |72          |  144
referent java.lang.ref.WeakReference @ 0xb3dc2d68                         |24          |  24

请帮助我绝望我如何解决内存问题？

我的home_screen.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.home_page);
    main();
 private void main() {
    // TODO Auto-generated method stub


    final Button home;
    final Button aboutus;
    final Button contacts;
    final Button clients;
    final Button services;

    try
    {

    home = (Button)findViewById(R.id.btnHome);
    aboutus = (Button)findViewById(R.id.btnAboutus);
    clients = (Button)findViewById(R.id.btnClients);
    contacts = (Button)findViewById(R.id.btnContacts);
    services = (Button)findViewById(R.id.btnServices);

    home.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.home1);
            Drawable d = new BitmapDrawable(getResources(),b);              
            home.setBackgroundDrawable(d);
            System.gc();
            Intent myIntent = new Intent(Home_Screen.this,Button_Anime.class);
            startActivity(myIntent);
        }
    });
    aboutus.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.about1 );
            Drawable d = new BitmapDrawable(getResources(),b); 
            aboutus.setBackgroundDrawable(d);
            Intent myIntent = new Intent(Home_Screen.this,AboutUs.class);
            startActivity(myIntent);
        }
    });
    clients.setOnClickListener(new  OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.clients1 );
            Drawable d = new BitmapDrawable(getResources(),b); 
            clients.setBackgroundDrawable(d);
            Intent myIntent = new Intent(Home_Screen.this,Clients.class);
            startActivity(myIntent);
        }
    });
    contacts.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.contact1);
            Drawable d = new BitmapDrawable(getResources(),b);
            contacts.setBackgroundDrawable(d);
            Intent myIntent = new Intent(Home_Screen.this,Contacts.class);
            startActivity(myIntent);
        }
    });
    services.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.services1 );
            Drawable d = new BitmapDrawable(getResources(),b);
            services.setBackgroundDrawable(d);
            Intent myIntent = new Intent(Home_Screen.this,Services.class);
            startActivity(myIntent);
        }
    });

    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}

解决方法

这个想法是缩小您的图像,使其在较小的屏幕上看起来不错,而且您不必在内存中加载整个位图.

1)首先得到您将要显示的ImageView /屏幕的大小.

2)通过传递BitmapFactory.Options.inJustDecodeBounds来读取Bitmap的大小.这将为您提供Bitmap的大小,而不是加载整个位图.

3)获取采样大小.计算屏幕的高度和宽度与图像高度和宽度的比率.使用最小的一个,使最大的尺寸看起来不错.

4)最后使用下面的功能来获取不会吃掉你的记忆的下抽样图像.

2)(代码)

BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmapOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(inputStream,null,bitmapOptions);
int imageWidth = bitmapOptions.outWidth;
int imageHeight = bitmapOptions.outHeight;
inputStream.close();

4)(代码)

private Bitmap downscaleBitmapUsingDensities(final int sampleSize,final int imageResId)
  {
  final Options bitmapOptions=new Options();
  bitmapOptions.inDensity=sampleSize;
  bitmapOptions.inTargetDensity=1;
  final Bitmap scaledBitmap=BitmapFactory.decodeResource(getResources(),imageResId,bitmapOptions);
  scaledBitmap.setDensity(Bitmap.DENSITY_NONE);
  return scaledBitmap;
  }

（编辑：李大同）

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