android - 633632 字节分配内存不足

Question

这是我的代码。开始时的目标是将图像抓取到动态 ListView 中，基本上就像我自己数据库中的 RSS 提要一样。我所做的是获取 http 链接并将其转换为可绘制对象，然后从那里将可绘制对象从动态 ListView 设置到 ImageView 中。

问题来了。当我进入应用程序时，第一次加载没问题。但是，当我点击刷新按钮时，我会收到“633632 字节分配内存不足”错误，然后是该错误的更详细版本，其中包含分配的所有堆大小、限制。

我该如何解决这个问题？

package com.whatstherex.sam;

import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Vector;

import org.apache.http.NameValuePair;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;

public class Snapshots extends Activity implements View.OnClickListener {
Button bBackSnapshots, bRefreshSnapshots, bSnapshotsSnapshots;
ListView snapshotsDynamicListView;
Vector<SnapshotsData> snapshotsInputs = new Vector<SnapshotsData>();
SnapshotsCustomFeedAdaptor adaptor;
String username, snapshotsList;
String[] feed;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    setContentView(R.layout.snapshots);

    initialize();
}

public void initialize() {
    bBackSnapshots = (Button) findViewById(R.id.bBackSnapshots);
    bRefreshSnapshots = (Button) findViewById(R.id.bRefreshSnapshots);
    bSnapshotsSnapshots = (Button) findViewById(R.id.bSnapshotsSnapshots);

    bBackSnapshots.setOnClickListener(this);
    bRefreshSnapshots.setOnClickListener(this);
    bSnapshotsSnapshots.setOnClickListener(this);                           

    getInformations();
}

private AsyncTask<String, Void, String> task;
private AsyncTask<String, Void, String> task1;
private AsyncTask<String, Void, InputStream[]> task2;

public void getInformations(){
    task = new AsyncTask<String, Void, String>() {
        ProgressDialog dialog;
        Bundle bundle;
        String res;
        @Override 
        protected void onPreExecute(){
            dialog = new ProgressDialog(Snapshots.this, ProgressDialog.STYLE_SPINNER);
            dialog.setMessage("Loading Data...");           
            dialog.setCancelable(false);
            dialog.setCanceledOnTouchOutside(false);    

            dialog.show();
        }

        @Override
        protected String doInBackground(String... arg0) {
            bundle = getIntent().getExtras();
            res = bundle.getString("Username");
            return res;
        }

        @Override
        protected void onPostExecute(String result) {
            dialog.dismiss();
            username = result;      

            task1 = new AsyncTask<String, Void, String>() {
                ProgressDialog dialog1;
                ArrayList<NameValuePair> postParameters;
                String response1;
                String res1;
                @Override 
                protected void onPreExecute(){
                    snapshotsDynamicListView = (ListView) findViewById(R.id.lvSnapshots);                       

                    postParameters = new ArrayList<NameValuePair>();

                    dialog1 = new ProgressDialog(Snapshots.this, ProgressDialog.STYLE_SPINNER);
                    dialog1.setMessage("Loading Data...");          
                    dialog1.setCancelable(false);
                    dialog1.setCanceledOnTouchOutside(false);   

                    dialog1.show();
                }

                @Override
                protected String doInBackground(String... arg0) {
                    try {
                        response1 = CustomHttpClient.executeHttpPost("http://whatstherex.info/getS.php", postParameters);

                        res1 = response1.toString();

                        res1 = res1.replaceAll("null", "");

                        snapshotsList = res1.toString();

                        return snapshotsList;
                    }catch(Exception e){
                        res1 = e.toString();
                        return res1;
                    }
                }

                @Override
                protected void onPostExecute(String result1) {
                    feed = result1.split("[_]");

                    task2 = new AsyncTask<String, Void, InputStream[]>() {          
                        ProgressDialog dialog2;
                        InputStream[] is = new InputStream[50];
                        Drawable[] d = new Drawable[50];
                        String[] res2 = new String[50];
                        Drawable p4, p5, p9, p10, p14, p15, p19, p20, p24, p25, p29, p30, p34, p35, p39, p40, p44, p45, p49, p50, p54, p55, p59, p60, p64, p65, p69, p70, p74, p75, p79, p80, p84, p85, p89, p90, p94, p95, p99, p100, p104, p105, p109, p110, p114, p115, p119, p120, p124, p125;
                        @Override 
                        protected void onPreExecute(){
                            dialog2 = new ProgressDialog(Snapshots.this, ProgressDialog.STYLE_SPINNER);
                            dialog2.setMessage("Loading Data...");          
                            dialog2.setCancelable(false);
                            dialog2.setCanceledOnTouchOutside(false);   

                            dialog2.show();
                        }

                        @Override
                        protected InputStream[] doInBackground(String... src) {
                            for(int i = 0; i<50; i++){
                                res2[i] = src[i];
                            }
                            for(int i = 0; i<50; i++){
                                try {
                                    is[i] = (InputStream) new URL(res2[i]).getContent();                                        
                                } catch (Exception e) {
                                    e.toString();
                                }
                            }
                                return is;
                        }

                        @Override
                        protected void onPostExecute(InputStream[] result2) {
                            for(int i = 0; i<50; i++){
                                try {
                                    d[i] = Drawable.createFromStream(result2[i], "src name");
                                } catch (Exception e) {
                                    e.toString();
                                }
                            }

                            p4 = d[0];
                            p5 = d[1];
                            p9 = d[2];
                            p10 = d[3];
                            p14 = d[4];
                            p15 = d[5];
                            p19 = d[6];
                            p20 = d[7];
                            p24 = d[8];
                            p25 = d[9];
                            p29 = d[10];
                            p30 = d[11];
                            p34 = d[12];
                            p35 = d[13];
                            p39 = d[14];
                            p40 = d[15];
                            p44 = d[16];
                            p45 = d[17];
                            p49 = d[18];
                            p50 = d[19];
                            p54 = d[20];
                            p55 = d[21];
                            p59 = d[22];
                            p60 = d[23];
                            p64 = d[24];
                            p65 = d[25];
                            p69 = d[26];
                            p70 = d[27];
                            p74 = d[28];
                            p75 = d[29];
                            p79 = d[30];
                            p80 = d[31];
                            p84 = d[32];
                            p85 = d[33];
                            p89 = d[34];
                            p90 = d[35];
                            p94 = d[36];
                            p95 = d[37];
                            p99 = d[38];
                            p100 = d[39];
                            p104 = d[40];
                            p105 = d[41];
                            p109 = d[42];
                            p110 = d[43];
                            p114 = d[44];
                            p115 = d[45];
                            p119 = d[46];
                            p120 = d[47];
                            p124 = d[48];
                            p125 = d[49];

                            snapshotsInputs.add(new SnapshotsData(feed[1].toString(), feed[2].toString(), feed[3].toString(), p4, p5));
                            snapshotsInputs.add(new SnapshotsData(feed[6].toString(), feed[7].toString(), feed[8].toString(), p9, p10));
                            snapshotsInputs.add(new SnapshotsData(feed[11].toString(), feed[12].toString(), feed[13].toString(), p14, p15));
                            snapshotsInputs.add(new SnapshotsData(feed[16].toString(), feed[17].toString(), feed[18].toString(), p19, p20));
                            snapshotsInputs.add(new SnapshotsData(feed[21].toString(), feed[22].toString(), feed[23].toString(), p24, p25));
                            snapshotsInputs.add(new SnapshotsData(feed[26].toString(), feed[27].toString(), feed[28].toString(), p29, p30));
                            snapshotsInputs.add(new SnapshotsData(feed[31].toString(), feed[32].toString(), feed[33].toString(), p34, p35));
                            snapshotsInputs.add(new SnapshotsData(feed[36].toString(), feed[37].toString(), feed[38].toString(), p39, p40));
                            snapshotsInputs.add(new SnapshotsData(feed[41].toString(), feed[42].toString(), feed[43].toString(), p44, p45));
                            snapshotsInputs.add(new SnapshotsData(feed[46].toString(), feed[47].toString(), feed[48].toString(), p49, p50));
                            snapshotsInputs.add(new SnapshotsData(feed[51].toString(), feed[52].toString(), feed[53].toString(), p54, p55));
                            snapshotsInputs.add(new SnapshotsData(feed[56].toString(), feed[57].toString(), feed[58].toString(), p59, p60));
                            snapshotsInputs.add(new SnapshotsData(feed[61].toString(), feed[62].toString(), feed[63].toString(), p64, p65));
                            snapshotsInputs.add(new SnapshotsData(feed[66].toString(), feed[67].toString(), feed[68].toString(), p69, p70));
                            snapshotsInputs.add(new SnapshotsData(feed[71].toString(), feed[72].toString(), feed[73].toString(), p74, p75));
                            snapshotsInputs.add(new SnapshotsData(feed[76].toString(), feed[77].toString(), feed[78].toString(), p79, p80));
                            snapshotsInputs.add(new SnapshotsData(feed[81].toString(), feed[82].toString(), feed[83].toString(), p84, p85));
                            snapshotsInputs.add(new SnapshotsData(feed[86].toString(), feed[87].toString(), feed[88].toString(), p89, p90));
                            snapshotsInputs.add(new SnapshotsData(feed[91].toString(), feed[92].toString(), feed[93].toString(), p94, p95));
                            snapshotsInputs.add(new SnapshotsData(feed[96].toString(), feed[97].toString(), feed[98].toString(), p99, p100));
                            snapshotsInputs.add(new SnapshotsData(feed[101].toString(), feed[102].toString(), feed[103].toString(), p104, p105));
                            snapshotsInputs.add(new SnapshotsData(feed[106].toString(), feed[107].toString(), feed[108].toString(), p109, p110));
                            snapshotsInputs.add(new SnapshotsData(feed[111].toString(), feed[112].toString(), feed[113].toString(), p114, p115));
                            snapshotsInputs.add(new SnapshotsData(feed[116].toString(), feed[117].toString(), feed[118].toString(), p119, p120));
                            snapshotsInputs.add(new SnapshotsData(feed[121].toString(), feed[122].toString(), feed[123].toString(), p124, p125));

                            adaptor = new SnapshotsCustomFeedAdaptor(Snapshots.this, R.layout.snapshotsdata, snapshotsInputs);
                            snapshotsDynamicListView.setAdapter(adaptor);

                            dialog2.dismiss();  
                        }
                    };                      
                    task2.execute(feed[4], feed[5], feed[9], feed[10], feed[14], feed[15], feed[19], feed[20], feed[24], feed[25], feed[29], feed[30], 
                            feed[34], feed[35], feed[39], feed[40], feed[44], feed[45], feed[49], feed[50], feed[54], feed[55], feed[59], feed[60], 
                            feed[64], feed[65], feed[69], feed[70], feed[74], feed[75], feed[79], feed[80], feed[84], feed[85], feed[89], feed[90], 
                            feed[94], feed[95], feed[99], feed[100], feed[104], feed[105], feed[109], feed[110], feed[114], feed[115], feed[119], 
                            feed[120], feed[124], feed[125]);

                    dialog1.dismiss();
                }
            };
            task1.execute();
        }
    };
    task.execute();
}

@Override
public void onClick(View v) {
    switch (v.getId()){
    case R.id.bBackSnapshots:
        finish();
        break;
    case R.id.bRefreshSnapshots:
        finish();
        startActivity(getIntent());
        break;
    case R.id.bSnapshotsSnapshots:

        break;
    }
}       
}

Answer 1

为什么要将大量 Drawable 添加到内存中。这就是问题所在。应用程序内存限制仅为 ~16MB(根据设备更改)。然而看起来您正在加载 100 个可绘制对象，很可能超过了这个数量。

您应该只在列表请求新 View 时加载可绘制对象。它会在不需要时处理它。

编辑:

您可以做的是覆盖适配器类。并指定图像的 url。然后在 getView 方法中，从给定的 Url 加载图像。这会按需处理异步加载。

例如:

https://stackoverflow.com/a/3068012/940834

http://www.androidhive.info/2012/02/android-custom-listview-with-image-and-text/