2

我正在尝试从 URL 和文本数据中获取图像，但它强制关闭了应用程序。它有什么问题..

public class BandMembers extends ListActivity {
public static final String TAG_MEMBER_NAME = "member_name";
public static final String TAG_MEMBER_SKILL = "member_skill";
public static final String TAG_THUMB_MEMBER_IMAGE = "member_thumb_image";
public static String URL = "http://...../.../..../mainAPI.php"; 

ArrayList<HashMap<String, String>> memberList;
String responseData = null;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.band_members);

    memberList = new ArrayList<HashMap<String,String>>();
    new AsyncData().execute();
}

class AsyncData extends AsyncTask<String, Void, Void> {
    ProgressDialog pDialog;

    @Override
    protected void onPreExecute() {
        pDialog = new ProgressDialog(BandMembers.this);
        pDialog.setTitle("Loading....");
        pDialog.setMessage("Please wait...");
        pDialog.show();
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground(String... args) {
        // TODO Auto-generated method stub
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(URL);
        try {
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            nameValuePairs.add(new BasicNameValuePair("rquest","{\"method\":\"band_members\",\"body\":[{}]}"));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity resEntity = response.getEntity();
            responseData = EntityUtils.toString(resEntity);
            try {
                JSONArray data = new JSONArray(responseData);
                for (int i = 0; i < data.length(); i++) {
                    HashMap<String, String> map = new HashMap<String, String>();
                    JSONObject c = data.getJSONObject(i);
                    String memberName = c.getString(TAG_MEMBER_NAME);
                    String memberSkill = c.getString(TAG_MEMBER_SKILL);
                    String memberImage = c.getString(TAG_THUMB_MEMBER_IMAGE);
                    map.put(TAG_MEMBER_NAME, memberName);
                    map.put(TAG_MEMBER_SKILL, memberSkill);
                    map.put(TAG_THUMB_MEMBER_IMAGE, memberImage);
                    memberList.add(map);
                }

            } catch (JSONException e) {
                // TODO: handle exception
                e.printStackTrace();
            }
        } catch (ClientProtocolException e) {
            Toast.makeText(BandMembers.this, "There was an issue Try again later", Toast.LENGTH_LONG).show();
        } catch (IOException e) {
            Toast.makeText(BandMembers.this, "There was an IO issue Try again later", Toast.LENGTH_LONG).show();
        }
        return null;
    }


    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        if (pDialog != null && pDialog.isShowing()) {
            pDialog.dismiss();
        }


        setListAdapter(new BandAdapter(BandMembers.this,R.layout.band_member_row_file, memberList));

    }
}
}

类带适配器

public class BandAdapter extends ArrayAdapter<HashMap<String, String>>{
Context context;
ArrayList<HashMap<String, String>> myList;
HashMap<String, String> myData;
int layout;
public BandAdapter(Context context, int textViewResourceId, List<HashMap<String, String>> objects) {
    super(context, textViewResourceId, objects);
    // TODO Auto-generated constructor stub
    this.context = context;
    this.myList = (ArrayList<HashMap<String, String>>) objects;
    this.layout = textViewResourceId;
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View row = null;
    TextView name, info;
    ImageView image;
    LayoutInflater inflater = ((Activity) context).getLayoutInflater();
    row = inflater.inflate(layout, parent, false);
    name = (TextView)row.findViewById(R.id.textMemberName);
    info = (TextView)row.findViewById(R.id.textMemberInfo);
    myData = myList.get(position);
    try{
        image = (ImageView)row.findViewById(R.id.imageMember);
        name.setText("" + myData.get(BandMembers.TAG_MEMBER_NAME));
        info.setText("" + myData.get(BandMembers.TAG_MEMBER_SKILL));
        Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL ("" + myData.get(BandMembers.TAG_THUMB_MEMBER_IMAGE)).getContent());
        image.setImageBitmap(bitmap);
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return row;
}
 }

而我的 Logcat 是..

04-26 12:01:15.574: E/AndroidRuntime(2575): FATAL EXCEPTION: main
04-26 12:01:15.574: E/AndroidRuntime(2575): android.os.NetworkOnMainThreadException
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1084)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at java.net.InetAddress.getAllByName(InetAddress.java:220)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:71)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpEngine.connect(HttpEngine.java:303)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at java.net.URLConnection.getContent(URLConnection.java:194)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at java.net.URL.getContent(URL.java:447)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at com.bandapp.BandAdapter.getView(BandAdapter.java:51)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.AbsListView.obtainView(AbsListView.java:2033)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.ListView.measureHeightOfChildren(ListView.java:1244)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.ListView.onMeasure(ListView.java:1155)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.RelativeLayout.measureChild(RelativeLayout.java:579)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:392)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2072)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2072)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.View.measure(View.java:12603)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1044)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2418)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.os.Looper.loop(Looper.java:137)
04-26 12:01:15.574: E/AndroidRuntime(2575):     at android.app.ActivityThread.main(ActivityT

请帮助我并用代码给出一些解决方案，谢谢你提前..

4

4 回答 4

2

只需用这个更改 BandAdapter 类..

public class BandAdapter extends ArrayAdapter<HashMap<String, String>> {
Context context;
ArrayList<HashMap<String, String>> myList;
HashMap<String, String> myData;
int layout;

public BandAdapter(Context context, int textViewResourceId, List<HashMap<String, String>> objects) {
    super(context, textViewResourceId, objects);
    // TODO Auto-generated constructor stub
    this.context = context;
    this.myList = (ArrayList<HashMap<String, String>>) objects;
    this.layout = textViewResourceId;
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View row = null;
    TextView name, info;
    ImageView image;
    Bitmap bimage;

    LayoutInflater inflater = ((Activity) context).getLayoutInflater();
    row = inflater.inflate(layout, parent, false);
    name = (TextView)row.findViewById(R.id.textMemberName);
    info = (TextView)row.findViewById(R.id.textMemberInfo);
    myData = myList.get(position);
    try{
        image = (ImageView)row.findViewById(R.id.imageMember);
        name.setText("" + myData.get(BandMembers.TAG_MEMBER_NAME));
        info.setText("" + myData.get(BandMembers.TAG_MEMBER_SKILL));
        String uri = ("" + myData.get(BandMembers.TAG_THUMB_MEMBER_IMAGE).replace(" ", "%20"));
        bimage=  getBitmapFromURL(uri);
        image.setImageBitmap(bimage);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return row;
}
public static Bitmap getBitmapFromURL(String src) {
    try {
        URL url = new URL(src);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
  }
}
于 2013-04-29T07:38:30.477 回答
1

如果您要下载并在 imageview 中显示图像，请尝试 Smart Image View

http://loopj.com/android-smart-image-view/

它工作得很好。

于 2013-04-26T06:55:23.610 回答
0 
        Toast.makeText(BandMembers.this, "There was an issue Try again later", Toast.LENGTH_LONG).show();

首先 Toast 不能在 doInBackground 中使用。它是工作线程。您应该始终在 UI 线程中处理您的 UI。

在同一时间，

Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL ("" +    myData.get(BandMembers.TAG_THUMB_MEMBER_IMAGE)).getContent());

似乎它正在从网络获取图像。它应该始终在工作线程中运行。除非你会得到android.os.NetworkOnMainThreadException. 这就是为什么你会得到例外。

您可以创建 Asyntask 来加载图像：

 class ImageDownloadTask extends AsyncTask<Void, Integer, Bitmap> {
        private ImageView mView;
        ImageDownloadTask(ImageView view){
            mView = view;
        }
        @Override
        protected Bitmap doInBackground(Void... params) {
              Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(""
                  + myData.get(BandMembers.TAG_THUMB_MEMBER_IMAGE)).getContent());
              return bitmap;
        }


        @Override
        protected void onPostExecute(Bitmap result) {
           mView.setImageBitmap(result);
        }
}

然后新建一个 SynckTask 以在您的getView方法中加载图像

 try{
        image = (ImageView)row.findViewById(R.id.imageMember);
        name.setText("" + myData.get(BandMembers.TAG_MEMBER_NAME));
        info.setText("" + myData.get(BandMembers.TAG_MEMBER_SKILL));
        ImageDownloadTask task = new ImageDownloadTask(image);
        task.execute();
    }
于 2013-04-26T07:11:42.473 回答
0

您可以使用 Android 查询库来延迟加载图像，它非常简单明了，您只需要指定图像的 url，该库会为您完成所有缓存和图像下载而且您的例外是网络主线程异常，您不应该在 doInBackground 方法中进行任何与 ui 相关的更改，例如加载图像的代码只有一行

//fetch and set the image from internet, cache with file and memory 
aq.id(R.id.image1).image("http://www.vikispot.com/z/images/vikispot/android-w.png");

您可以在（ https://code.google.com/p/android-query/）查看查询

于 2013-04-26T07:09:31.667 回答