android - 在 Android 中从 URL 加载图像

Question

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;
}
 }

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

请帮助我并提供一些代码解决方案，在此先感谢您..

Answer 1

只需用这个改变 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;
    }
  }
}