Question

我正在开发一个应用程序，其中我的主页面是网格视图，我从服务器获取缩略图图像。当用户单击主活动上的图像时，它会获取项目的位置并调用另一个URL来加载单个完整大小的图像并加载到详细活动中。我只需使用后退按钮在主要活动和详细活动之间前进即可。我已完成此步骤8-9次，我的应用程序崩溃，它抛出内存（OOM）。

我的全尺寸图像在30 kb到115 kb之间变化。缩略图图像的变化范围为20 kb到45 kb。

java.lang.RuntimeException：执行时发生错误 doInBackground（）

我在详细活动中使用Volley和我的图像加载如下。

在以下代码中，我检索单击的产品json对象，它包含相应的完整大小图像的URL。

在主要活动中检索详细信息产品JSON对象。

StringRequest postRequest = new StringRequest(Request.Method.POST, Config.PRODUCT_DETAIL_URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            Intent intent = new Intent(MainActivity.this, ProductDetailActivity.class);
                            intent.putExtra("jsonArray", response);
                            MainActivity.this.startActivity(intent);
                            MainActivity.this.finish();
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        error.printStackTrace();
                    }
                }
        ) {
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<>();
                params.put("id", productid);
                return params;
            }
     }

我将JSON对象从主活动发送到详细活动，如下所示intent.putExtra("jsonArray", response);并获取图像URL并在ImageView中显示如下。

在DetailActivity中

 String MY_URL_STRING = Config.IMAGE_PATH_URL+"/"+obj.optString("pimagePath");
        new DownloadImageTask((ImageView) findViewById(R.id.detailImage))
                .execute(MY_URL_STRING);

DownloadImageTask Class

public class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
    ImageView bmImage;

    public DownloadImageTask(ImageView bmImage) {
        this.bmImage = bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}

CustomVolley请求

private CustomVolleyRequest(Context context) {
        this.context = context;
        this.requestQueue = getRequestQueue();

        imageLoader = new ImageLoader(requestQueue,
                new ImageLoader.ImageCache() {
                    private final LruCache<String, Bitmap>
                            cache = new LruCache<String, Bitmap>(20);

                    @Override
                    public Bitmap getBitmap(String url) {
                        return cache.get(url);
                    }

                    @Override
                    public void putBitmap(String url, Bitmap bitmap) {
                        cache.put(url, bitmap);
                    }
                });
    }

    public static synchronized CustomVolleyRequest getInstance(Context context) {
        if (customVolleyRequest == null) {
            customVolleyRequest = new CustomVolleyRequest(context);
        }
        return customVolleyRequest;
    }

    public RequestQueue getRequestQueue() {
        if (requestQueue == null) {
            Cache cache = new DiskBasedCache(context.getCacheDir(), 10 * 1024 * 1024);
            Network network = new BasicNetwork(new HurlStack());
            requestQueue = new RequestQueue(cache, network);
            requestQueue.start();
        }
        return requestQueue;
    }

    public ImageLoader getImageLoader() {
        return imageLoader;
    }

}

我在监视内存的同时测试了应用程序，我观察到内存已分配并且从未释放回来，即使我不再看那个图像了。它不断增加。对不起，我来自iOS方面，相对较新的Android，并不了解内存管理。

内存监控，每次点击都会增加，当我回到主要活动时它会释放内存！

堆栈追踪：

E/AndroidRuntime: FATAL EXCEPTION: AsyncTask  E/AndroidRuntime: 
Process: PID: 5700 
java.lang.RuntimeException: An error occured while executing
doInBackground()  E/AndroidRuntime:     at
android.os.AsyncTask$3.done(AsyncTask.java:300)  E/AndroidRuntime:     at
java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
E/AndroidRuntime:     at
java.util.concurrent.FutureTask.setException(FutureTask.java:222)
E/AndroidRuntime:     at
java.util.concurrent.FutureTask.run(FutureTask.java:242)
E/AndroidRuntime:     at
android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
E/AndroidRuntime:     at
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
E/AndroidRuntime:     at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:841) 
E/AndroidRuntime:  Caused by: java.lang.OutOfMemoryError
E/AndroidRuntime:     at
android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
E/AndroidRuntime:     at
android.graphics.BitmapFactory.decodeStreamInternal(BitmapFactory.java:613)
E/AndroidRuntime:     at
android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:589)
E/AndroidRuntime:     at
android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:627)
E/AndroidRuntime:     at
 com.example.xxx.xxx.DownloadImageTask.doInBackground(DownloadImageTask.java:26)
E/AndroidRuntime:     at
 com.example.xxx.xxx.DownloadImageTask.doInBackground(DownloadImageTask.java:14)
E/AndroidRuntime:     at
android.os.AsyncTask$2.call(AsyncTask.java:288)
E/AndroidRuntime:     at
java.util.concurrent.FutureTask.run(FutureTask.java:237)
E/AndroidRuntime:     at
android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
E/AndroidRuntime:     at
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
E/AndroidRuntime:     at
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:841)

内存管理（OOM）：java.lang.RuntimeException：执行时发生错误

0 个答案: