我的活动在Android 4.1上无效，但在2.2,2.3和4.0上运行正常。我在下面粘贴的logcat中显示了一些错误。
发生了什么事？
public class fifthscreen extends Activity {
String num = null;
TextView ingredient;
ImageButton slideHandleButton;
String name;
String name2;
long Menu_ID;
String dish_name;
String Type;
String status;
String message;
// HorizontalListView listview;
// CategoryListAdapter3 cla;
String DescriptionAPI;
// ImageLoader2 imgLoader;
TextView txt1, txt2, txt3;
ImageView img1;
String URL, URL2;
String SelectMenuAPI;
static ArrayList < Long > Category_ID = new ArrayList < Long > ();
static ArrayList < String > Category_name = new ArrayList < String > ();
static ArrayList < String > Category_image = new ArrayList < String > ();
public static String allergen2;
// private AQuery androidAQuery;
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fifthscreen);
ingredient = (TextView) findViewById(R.id.ingredient);
img1 = (ImageView) findViewById(R.id.test_button_image);
txt1 = (TextView) findViewById(R.id.menuname);
// txt2 = (TextView) findViewById(R.id.test_button_text1);
txt3 = (TextView) findViewById(R.id.description);
Intent iGet = getIntent();
ImageView options = (ImageView) findViewById(R.id.options5);
// androidAQuery = new AQuery(this);
options.setOnClickListener(new OnClickListener() {
@Override public void onClick(View v) {
Intent iMenuList = new Intent(fifthscreen.this, LinkButtons.class); startActivity(iMenuList);}});
dish_name = iGet.getStringExtra("dish_name");
ImageView btnback = (ImageView) findViewById(R.id.btnback);
btnback.setOnClickListener(new OnClickListener() {
@Override public void onClick(View v) {
finish();}
});
parseJSONData();
}
void clearData() {
Category_ID.clear();
Category_name.clear();
Category_image.clear();
}
public void parseJSONData() {
SelectMenuAPI = Utils.dishdescription + dish_name;
// SelectMenuAPI = Utils.dishdescription;
clearData();
URL = SelectMenuAPI;
URL2 = URL.replace(" ", "%20");
// URL2 = SelectMenuAPI;
try {
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 15000);
HttpConnectionParams.setSoTimeout(client.getParams(), 15000);
HttpUriRequest request = new HttpGet(URL2);
HttpResponse response = client.execute(request);
InputStream atomInputStream = response.getEntity().getContent();
BufferedReader in = new BufferedReader(new InputStreamReader(atomInputStream));
String line;
String str = "";
while ((line = in.readLine()) != null) {
str += line;
}
JSONObject json2 = new JSONObject(str);
status = json2.getString("status");
if (status.equals("1")) {
JSONArray school2 = json2.getJSONArray("data");
String[]mVal = new String[school2.length()];
for (int i = 0; i < school2.length(); i++) {
String name = school2.getJSONObject(0).getString("name");
txt1.setText(name);
String description = school2.getJSONObject(0).getString("description");
txt3.setText(description);
String url1 = school2.getJSONObject(0).getString("image");
androidAQuery.id(img1).image(url1, false, false);
}
JSONObject school3 = json2.getJSONObject("dish_nutrition");
final TableLayout table = (TableLayout) findViewById(R.id.table2);
for (int j = 0; j < school3.length(); j++) {
String s = String.valueOf(j + 1);
final View row = createRow(school3.getJSONObject(s));
table.addView(row);
}
JSONArray school4 = json2.getJSONArray("dish_allergen");
//
for (int i = 0; i < school4.length(); i++) {
JSONObject object = school4.getJSONObject(i);
Category_ID.add((long) i);
Category_name.add(object.getString("name"));
Category_image.add(object.getString("image"));
listview.setAdapter(cla);
}
final LinearLayout table3 = (LinearLayout) findViewById(R.id.table3);
JSONArray school5 = json2.getJSONArray("dish_ingredient");
for (int i = 0; i < school5.length(); i++) {
JSONObject jsonObject = school5.getJSONObject(i);
final View row2 = createRow2(school5.getJSONObject(i));
table3.addView(row2);
}
}
else {
JSONArray school2 = json2.getJSONArray("data");
for (int i = 0; i < school2.length(); i++) {
JSONObject object = school2.getJSONObject(i);
Category_ID.add((long) i);
Category_name.add(object.getString("name"));
}
}
} catch(MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch(IOException e) {
// TODO Auto-generated catch block
// IOConnect = 1;
e.printStackTrace();
} catch(JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public View createRow(JSONObject item) throws JSONException {
View row = getLayoutInflater().inflate(R.layout.rows, null);
((TextView) row.findViewById(R.id.localTime)).setText(item.getString("qty"));
((TextView) row.findViewById(R.id.apprentTemp)).setText(item.getString("name"));
return row;
} public View createRow2(JSONObject item) throws JSONException {
View row2 = getLayoutInflater().inflate(R.layout.row2, null);
((TextView) row2.findViewById(R.id.name)).setText(item.getString("name"));
((TextView) row2.findViewById(R.id.subingredients)).setText(item.getString("sub_ingredients"));
return row2;
}}
logcat的：
Skipped 74 frames! The application may be doing too much work on its main thread.
Skipped 61 frames! The application may be doing too much work on its main thread.
Shutting down VM
threadid=1: thread exiting with uncaught exception (group=0x40a71930)
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.schoollunchapp/com.schoollunchapp.fifthscreen}:
android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
at libcore.io.IoBridge.connectErrno(IoBridge.java:144)
at libcore.io.IoBridge.connect(IoBridge.java:112)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
at java.net.Socket.connect(Socket.java:842)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection
(DefaultClientConnectionOperator.java:144)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
at
org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
at
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
at com.schoollunchapp.fifthscreen.parseJSONData(fifthscreen.java:196)
at com.schoollunchapp.fifthscreen.onCreate(fifthscreen.java:157)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
答案 0 :(得分：0)
因为缺少AsyncTask而发生这种情况。将所有HttpClient逻辑放到AsyncTask。
从您的日志：
android.os.NetworkOnMainThreadException
您无法在主线程上运行parseJSONData。
以下是如何实现它的一些示例：
private class AsyncRequestConnection extends AsyncTask<Void, Void, String> {
private final Request request;
public AsyncRequestConnection(Request request) {
this.request = request;
}
@Override
protected String doInBackground(Void... params) {
try {
HttpPost p = createRequestHttpMessage(request);
String resp = new String(stripResponse(getRequestClient().execute(p)));
Log.v(TAG, resp);
return resp;
} catch (Exception e) {
Log.e(TAG, "Cannot complete API request", e);
cancel(false);
return null;
}
}
@Override
protected void onCancelled() {
request.backoff();
if (request.hasReachedMaxBackoff()) {
request.cancel(R.string.error_internal);
} else {
requestQueue.enqueue(request);
}
requestConnection = null;
nextRequest();
}
@Override
protected void onPostExecute(String result) {
if (result != null) {
request.attachResponse(result);
request.handleResponse();
requestConnection = null;
nextRequest();
} else {
request.cancel(R.string.error_internal);
}
}
}
从您的活动中调用它：
AsyncRequestConnection task = new AsyncRequestConnection ();
task.execute();
答案 1 :(得分：0)
所有与网络相关的操作都不在UI线程中运行。这必然导致问题。更多细节。 http://developer.android.com/training/basics/network-ops/connecting.html