如何从后台任务更新用户界面 [英] how to update Ui from background task
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问题描述
我的应用程序不工作在Android 4.1版本提供了异常，比如 android.os.NetworkOnMainThreadException
我对计算器的建议我做网络线程在后台搜索的AsyncTask 所以使用前backgroundtask，
我的屏幕看起来像这个 http://imgur.com/PlhS03i 使用backgroundtask后表现出营养的多行和成分标签我的屏幕看起来像这个 http://imgur.com/zUvxNpy 显示的成分和营养标签<只有单排/ p>
前，后台任务code是该见下面
公共类fifthscreen延伸活动{
字符串NUM = NULL;
TextView的成分;长Menu_ID;
串dish_name;字符串状态;HorizontalListView列表视图;
CategoryListAdapter3 CLA;
串DescriptionAPI;TextView的TXT1，TXT2，txt3;
ImageView的IMG1;
字符串URL，URL2;
串SelectMenuAPI;静态的ArrayList＆LT;龙＆GT; CATEGORY_ID =新的ArrayList＆LT;龙＆GT;（）;
静态的ArrayList＆LT;串GT; CATEGORY_NAME =新的ArrayList＆LT;串GT;（）;
静态的ArrayList＆LT;串GT; Category_image =新的ArrayList＆LT;串GT;（）;公共静态字符串allergen2;
私人AQuery androidAQuery;@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.fifthscreen）;
成分=（的TextView）findViewById（R.id.ingredient）;
IMG1 =（ImageView的）findViewById（R.id.test_button_image）; TXT1 =（的TextView）findViewById（R.id.menuname）;
txt3 =（的TextView）findViewById（R.id.description）; 意向书的iget = getIntent（）; ImageView的选项=（ImageView的）findViewById（R.id.options5）;
androidAQuery =新AQuery（本）; options.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
意图iMenuList =新意图（fifthscreen.this，
LinkButtons.class）;
startActivity（iMenuList）;
}
}）; dish_name = iGet.getStringExtra（dish_name）; 列表视图=（HorizontalListView）this.findViewById（R.id.listview2）; CLA =新CategoryListAdapter3（fifthscreen.this）;
listview.setAdapter（CLA）; parseJSONData（）;}无效clearData（）{
Category_ID.clear（）;
Category_name.clear（）;
Category_image.clear（）;}公共无效parseJSONData（）{ SelectMenuAPI = Utils.dishdescription + dish_name; clearData（）;
URL = SelectMenuAPI;
URL2 = URL.replace（，％20）; 尝试{ HttpClient的客户端=新DefaultHttpClient（）;
HttpConnectionParams
.setConnectionTimeout（client.getParams（），15000）;
HttpConnectionParams.setSoTimeout（client.getParams（），15000）;
HttpUriRequest要求=新HTTPGET（URL2）;
HTT presponse响应= client.execute（请求）;
InputStream的atomInputStream = response.getEntity（）的getContent（）。
在的BufferedReader =新的BufferedReader（新的InputStreamReader（
atomInputStream））; 串线;
字符串str =;
而（（行= in.readLine（））！= NULL）{
STR + =行;
} JSONObject的json2 =新的JSONObject（STR）; 状态= json2.getString（状态）;
如果（status.equals（1））{ JSONArray school2 = json2.getJSONArray（数据）; 的for（int i = 0; I＆LT; school2.length（）;我++）{ 字符串名称= school2.getJSONObject（0）.getString（名称）;
txt1.setText（名）; 字符串描述= school2.getJSONObject（0）.getString（
描述）; txt3.setText（介绍）; 字符串为url1 = school2.getJSONObject（0）.getString（图像）; androidAQuery.id（IMG1）在图像配（为url1，假的，假的）; } JSONObject的school3 = json2.getJSONObject（dish_nutrition）; 最后TableLayout表=（TableLayout）findViewById（R.id.table2）; 对于（INT J = 0; J＆LT; school3.length（）; J ++）{ 字符串s =将String.valueOf第（j + 1）; 最终视图行= createRow（school3.getJSONObject（S））;
table.addView（行）; } JSONArray school4 = json2.getJSONArray（dish_allergen）;
//
的for（int i = 0; I＆LT; school4.length（）;我++）{
的JSONObject对象= school4.getJSONObject（I） Category_ID.add（（长）一）;
Category_name.add（object.getString（名字））;
Category_image.add（object.getString（图像））;
listview.setAdapter（CLA）; } 最终的LinearLayout表3 =（的LinearLayout）findViewById（R.id.table3）; JSONArray school5 = json2.getJSONArray（dish_ingredient）; 的for（int i = 0; I＆LT; school5.length（）;我++）{ 最后查看ROW2 = createRow2（school5.getJSONObject（I））;
table3.addView（ROW2）; } } 其他{ JSONArray school2 = json2.getJSONArray（数据）;
的for（int i = 0; I＆LT; school2.length（）;我++）{
的JSONObject对象= school2.getJSONObject（I） Category_ID.add（（长）一）;
Category_name.add（object.getString（名字））; } } }赶上（MalformedURLException的E）{
// TODO自动生成catch块
e.printStackTrace（）;
}赶上（IOException异常五）{
// TODO自动生成catch块
// IOConnect = 1;
e.printStackTrace（）;
}赶上（JSONException E）{
// TODO自动生成catch块
e.printStackTrace（）;
}
}公共查看createRow（JSONObject的项目）抛出JSONException {
查看排= getLayoutInflater（）膨胀（R.layout.rows，NULL）;
（（的TextView）row.findViewById（R.id.localTime））。的setText（项目
.getString（数量））;
（（的TextView）row.findViewById（R.id.ap prentTemp））的setText。（项目
.getString（名字））; 返回行;
}公共查看createRow2（JSONObject的项目）抛出JSONException { 查看ROW2 = getLayoutInflater（）膨胀（R.layout.row2，NULL）;
（（的TextView）row2.findViewById（R.id.name））。的setText（项目
.getString（名字））;
（（的TextView）row2.findViewById（R.id.subingredients））。的setText（项目
.getString（sub_ingredients））; 返回ROW2;
} }
使用后的AsyncTask 看到以下code
公共类fifthscreen延伸活动{
字符串NUM = NULL;
TextView的成分;长Menu_ID;
串dish_name;字符串状态;HorizontalListView列表视图;
CategoryListAdapter3 CLA;
串DescriptionAPI;TextView的TXT1，TXT2，txt3;
ImageView的IMG1;
字符串URL，URL2;
串SelectMenuAPI;
字符串描述;INT IOConnect = 0;
字符串名称;
串URL1;
TableLayout表;
表3的LinearLayout;
查看排;
查看ROW2;静态的ArrayList＆LT;龙＆GT; CATEGORY_ID =新的ArrayList＆LT;龙＆GT;（）;
静态的ArrayList＆LT;串GT; CATEGORY_NAME =新的ArrayList＆LT;串GT;（）;
静态的ArrayList＆LT;串GT; Category_image =新的ArrayList＆LT;串GT;（）;
公共静态字符串allergen2;
私人AQuery androidAQuery;@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.fifthscreen）;
如果（android.os.Build.VERSION.SDK_INT＆GT; 9）{
StrictMode.ThreadPolicy政策=新StrictMode.ThreadPolicy.Builder（）
.permitAll（）建立（）。
StrictMode.setThreadPolicy（政策）;
}
成分=（的TextView）findViewById（R.id.ingredient）;
IMG1 =（ImageView的）findViewById（R.id.test_button_image）; TXT1 =（的TextView）findViewById（R.id.menuname）;
// TXT2 =（的TextView）findViewById（R.id.test_button_text1）;
txt3 =（的TextView）findViewById（R.id.description）; 表=（TableLayout）findViewById（R.id.table2）;
表3 =（的LinearLayout）findViewById（R.id.table3）; 意向书的iget = getIntent（）; ImageView的选项=（ImageView的）findViewById（R.id.options5）;
androidAQuery =新AQuery（本）; options.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
意图iMenuList =新意图（fifthscreen.this，
LinkButtons.class）;
startActivity（iMenuList）;
}
}）; dish_name = iGet.getStringExtra（dish_name）; 列表视图=（HorizontalListView）this.findViewById（R.id.listview2）; CLA =新CategoryListAdapter3（fifthscreen.this）; 新getDataTask（）执行（）; // listview.setAdapter（CLA）; ImageView的btnback =（ImageView的）findViewById（R.id.btnback）; btnback.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
完（）;
}
}）; parseJSONData（）;}无效clearData（）{
Category_ID.clear（）;
Category_name.clear（）;
Category_image.clear（）;}公共类getDataTask扩展的AsyncTask＆LT;太虚，太虚，太虚＆GT; { getDataTask（）{ } @覆盖
在preExecute保护无效（）{
// TODO自动生成方法存根 } @覆盖
保护无效doInBackground（虚空......为arg0）{
// TODO自动生成方法存根
parseJSONData（）;
返回null;
} @覆盖
保护无效onPostExecute（虚空结果）{
// TODO自动生成方法存根
txt1.setText（名）;
txt3.setText（介绍）;
androidAQuery.id（IMG1）在图像配（为url1，假的，假的）; table.addView（行）;
table3.addView（ROW2）;
listview.setAdapter（CLA）; }
}公共无效parseJSONData（）{ SelectMenuAPI = Utils.dishdescription + dish_name; clearData（）;
URL = SelectMenuAPI;
URL2 = URL.replace（，％20）; 尝试{ HttpClient的客户端=新DefaultHttpClient（）;
HttpConnectionParams
.setConnectionTimeout（client.getParams（），15000）;
HttpConnectionParams.setSoTimeout（client.getParams（），15000）;
HttpUriRequest要求=新HTTPGET（URL2）;
HTT presponse响应= client.execute（请求）;
InputStream的atomInputStream = response.getEntity（）的getContent（）。
在的BufferedReader =新的BufferedReader（新的InputStreamReader（
atomInputStream））; 串线;
字符串str =;
而（（行= in.readLine（））！= NULL）{
STR + =行;
} JSONObject的json2 =新的JSONObject（STR）; 状态= json2.getString（状态）;
如果（status.equals（1））{ JSONArray school2 = json2.getJSONArray（数据）; 的for（int i = 0; I＆LT; school2.length（）;我++）{ 名称= school2.getJSONObject（0）.getString（名称）; 说明= school2.getJSONObject（0）.getString（
描述）; 为url1 = school2.getJSONObject（0）.getString（图像）; } JSONObject的school3 = json2.getJSONObject（dish_nutrition）; 对于（INT J = 0; J＆LT; school3.length（）; J ++）{ 字符串s =将String.valueOf第（j + 1）; 行= createRow（school3.getJSONObject（S））; } JSONArray school4 = json2.getJSONArray（dish_allergen）;
//
的for（int i = 0; I＆LT; school4.length（）;我++）{
的JSONObject对象= school4.getJSONObject（I） Category_ID.add（（长）一）;
Category_name.add（object.getString（名字））;
Category_image.add（object.getString（图像））; } JSONArray school5 = json2.getJSONArray（dish_ingredient）; 的for（int i = 0; I＆LT; school5.length（）;我++）{ ROW2 = createRow2（school5.getJSONObject（I））; } } 其他{ JSONArray school2 = json2.getJSONArray（数据）;
的for（int i = 0; I＆LT; school2.length（）;我++）{
的JSONObject对象= school2.getJSONObject（I） Category_ID.add（（长）一）;
Category_name.add（object.getString（名字））; } } }赶上（MalformedURLException的E）{
// TODO自动生成catch块
e.printStackTrace（）;
}赶上（IOException异常五）{
// TODO自动生成catch块
// IOConnect = 1;
e.printStackTrace（）;
}赶上（JSONException E）{
// TODO自动生成catch块
e.printStackTrace（）;
}
}公共查看createRow（JSONObject的项目）抛出JSONException {
查看排= getLayoutInflater（）膨胀（R.layout.rows，NULL）;
（（的TextView）row.findViewById（R.id.localTime））。的setText（项目
.getString（数量））;
（（的TextView）row.findViewById（R.id.ap prentTemp））的setText。（项目
.getString（名字））; 返回行;
}公共查看createRow2（JSONObject的项目）抛出JSONException { 查看ROW2 = getLayoutInflater（）膨胀（R.layout.row2，NULL）;
（（的TextView）row2.findViewById（R.id.name））。的setText（项目
.getString（名字））;
（（的TextView）row2.findViewById（R.id.subingredients））。的setText（项目
.getString（sub_ingredients））; 返回ROW2;
} }
请帮助
在此先感谢...：）
解决方案
您可以使用 ** runOnUiThread（）** 是这样的：
{尝试
// code在线程中运行
runOnUiThread（新的Runnable（）{
@覆盖
公共无效的run（）{ //你的code }
}）;
}赶上（最终异常前）{
Log.i（---，异常螺纹）;
}
My app is not working on android version 4.1 gives exception like android.os.NetworkOnMainThreadException
i have search on stackoverflow advice me to do network thread in background AsyncTask so before use backgroundtask,
My screen look like this http://imgur.com/PlhS03i show multiple rows in nutrition's and ingredient tags after using backgroundtask my screen look like this http://imgur.com/zUvxNpy show only single row in ingredients and nutrition tags
before background task code is this see below
public class fifthscreen extends Activity {
String num = null;
TextView ingredient;
long Menu_ID;
String dish_name;
String status;
HorizontalListView listview;
CategoryListAdapter3 cla;
String DescriptionAPI;
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);
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");
listview = (HorizontalListView) this.findViewById(R.id.listview2);
cla = new CategoryListAdapter3(fifthscreen.this);
listview.setAdapter(cla);
parseJSONData();
}
void clearData() {
Category_ID.clear();
Category_name.clear();
Category_image.clear();
}
public void parseJSONData() {
SelectMenuAPI = Utils.dishdescription + dish_name;
clearData();
URL = SelectMenuAPI;
URL2 = URL.replace(" ", "%20");
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");
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++) {
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;
}
}
After using AsyncTask see this code below
public class fifthscreen extends Activity {
String num = null;
TextView ingredient;
long Menu_ID;
String dish_name;
String status;
HorizontalListView listview;
CategoryListAdapter3 cla;
String DescriptionAPI;
TextView txt1, txt2, txt3;
ImageView img1;
String URL, URL2;
String SelectMenuAPI;
String description;
int IOConnect = 0;
String name;
String url1;
TableLayout table;
LinearLayout table3;
View row;
View row2;
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);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
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);
table = (TableLayout) findViewById(R.id.table2);
table3 = (LinearLayout) findViewById(R.id.table3);
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");
listview = (HorizontalListView) this.findViewById(R.id.listview2);
cla = new CategoryListAdapter3(fifthscreen.this);
new getDataTask().execute();
// listview.setAdapter(cla);
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 class getDataTask extends AsyncTask<Void, Void, Void> {
getDataTask() {
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
parseJSONData();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
txt1.setText(name);
txt3.setText(description);
androidAQuery.id(img1).image(url1, false, false);
table.addView(row);
table3.addView(row2);
listview.setAdapter(cla);
}
}
public void parseJSONData() {
SelectMenuAPI = Utils.dishdescription + dish_name;
clearData();
URL = SelectMenuAPI;
URL2 = URL.replace(" ", "%20");
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");
for (int i = 0; i < school2.length(); i++) {
name = school2.getJSONObject(0).getString("name");
description = school2.getJSONObject(0).getString(
"description");
url1 = school2.getJSONObject(0).getString("image");
}
JSONObject school3 = json2.getJSONObject("dish_nutrition");
for (int j = 0; j < school3.length(); j++) {
String s = String.valueOf(j + 1);
row = createRow(school3.getJSONObject(s));
}
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"));
}
JSONArray school5 = json2.getJSONArray("dish_ingredient");
for (int i = 0; i < school5.length(); i++) {
row2 = createRow2(school5.getJSONObject(i));
}
}
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;
}
}
Please Help
Thanks in Advance...:)
解决方案
You can use **runOnUiThread()** like this:
try {
// code runs in a thread
runOnUiThread(new Runnable() {
@Override
public void run() {
// YOUR CODE
}
});
} catch (final Exception ex) {
Log.i("---","Exception in thread");
}
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