我试图在我的onPostExcute中调用另一个Asynchtask。 Logcat说我对第二个异步任务的最后一行有问题。我找不到问题。任何帮助将不胜感激。
LoginActivity有一个方法loginUser，它调用第一个Asynchtask PostLoginData，它调用第二个名为VitalService的函数。
Logcat说问题出在第二个asynctask的最后一行
这是代码
LoginActivity
public class LoginActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.cinch.loginapp.MESSAGE";
public static final String urlString = RestApiPaths.LOGIN;
public static Context context;
LoginActivity loginActivity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
context = this.getBaseContext();
}
public void loginUser(View view) {
EditText user = (EditText) findViewById(R.id.enter_username);
EditText pass = (EditText) findViewById(R.id.enter_password);
String username = user.getText().toString();
String password = pass.getText().toString();
if (username != null && !username.isEmpty() && password != null && !password.isEmpty()) {
PostLoginData postLoginData = new PostLoginData(LoginActivity.this);
postLoginData.execute(urlString, username, password);
}
}
}
PostLoginData.java
public class PostLoginData extends AsyncTask<String, String, String> {
public LoginActivity loginActivity;
private Activity activity;
private Context context;
public PostLoginData(LoginActivity activity){
super();
this.activity = activity;
this.context = this.activity.getApplicationContext();
}
@Override
protected String doInBackground(String... params) {
String username = params[1].toString();
String password = params[2].toString();
String message = null;
HttpClient httpClient = ServiceHelper.getHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost("http://test.gogch.com/gch-restful/login");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("username",username));
nameValuePairs.add(new BasicNameValuePair("password",password));
try {
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
}
catch (UnsupportedEncodingException e){
e.printStackTrace();
}
try {
HttpResponse response = httpClient.execute(httpPost);
int statusCode = response.getStatusLine().getStatusCode();
Log.d("Http Post Response:" ,Integer.toString(statusCode));
message = EntityUtils.toString(response.getEntity());
Log.d("Http Post Response:" ,message);
}
catch(ClientProtocolException e){
e.printStackTrace();
}
catch (IOException e){
e.printStackTrace();
}
return message;
}
protected void onPostExecute(String result) {
try {
JSONObject json = new JSONObject(result);
String status = json.getString("status");
if(status.equals("true"))
new VitalService(activity).execute();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
VitalService
public class VitalService extends AsyncTask<String, String, String> {
public final static String VITAL_RESPONSE = "com.cinch.loginapp.VITALS";
private Context context;
private Activity activity;
public VitalService(Activity activity){
super();
this.activity = activity;
this.context = this.activity.getApplicationContext();
}
protected String doInBackground(String... params){
String vitalsResponseText = null;
HttpClient httpClient = ServiceHelper.getHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpGet httpGet = new HttpGet("http://test.gogch.com/gch-restful/vitals/custome/added/parentvitals");
Log.d("KMN", "Sucess");
try {
HttpResponse response = httpClient.execute(httpGet);
int statusCode = response.getStatusLine().getStatusCode();
vitalsResponseText = EntityUtils.toString(response.getEntity());
}
catch(ClientProtocolException e){
e.printStackTrace();
}
catch (IOException e){
e.printStackTrace();
}
return vitalsResponseText;
}
protected void onPostExecute(String responseText){
Intent intent = new Intent(context, VitalListActivity.class);
intent.putExtra(VITAL_RESPONSE,responseText);
Log.d("putextra","success");
context.startActivity(intent);
}
}
VitalListActivity
public class VitalListActivity extends ActionBarActivity {
private static List<String> vitalList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_vital_list);
Log.d("rfvb","ok");
Intent intent = getIntent();
String status = intent.getStringExtra(VitalService.VITAL_RESPONSE);
TextView tv = new TextView(this);
tv.setText(status);
setContentView(tv);
}
}
logcat的
04-08 18:17:30.028 3716-3716/com.cinch.getvitalsapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.cinch.getvitalsapp, PID: 3716
android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
at android.app.ContextImpl.startActivity(ContextImpl.java:1232)
at android.app.ContextImpl.startActivity(ContextImpl.java:1219)
at android.content.ContextWrapper.startActivity(ContextWrapper.java:322)
at com.cinch.getvitalsapp.services.VitalService.onPostExecute(VitalService.java:65)
at com.cinch.getvitalsapp.services.VitalService.onPostExecute(VitalService.java:28)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
答案 0 :(得分：1)
我不确定它会起作用。基于我的想法
Intent i = new Intent().setClass(context, YourActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
// Launch the new activity and add the additional flags to the intent
context.startActivity(i);
一旦我遇到同样的问题。我解决了这个不确定你的情况。试试这个。
答案 1 :(得分：0)
使用您的本地字段activity而不是context来启动新的Activity。它将此标记为问题，因为context字段实际上是应用程序上下文而不是Activity上下文。
答案 2 :(得分：0)
请勿使用applicationContext代替传递活动。
public class VitalService扩展了AsyncTask {
public final static String VITAL_RESPONSE = "com.cinch.loginapp.VITALS";
private Context context;
private Activity activity;
public VitalService(Activity activity){
super();
this.activity = activity;
this.context = this.activity.getApplicationContext();
}
protected String doInBackground(String... params){
String vitalsResponseText = null;
HttpClient httpClient = ServiceHelper.getHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpGet httpGet = new HttpGet("http://test.gogch.com/gch-restful/vitals/custome/added/parentvitals");
Log.d("KMN", "Sucess");
try {
HttpResponse response = httpClient.execute(httpGet);
int statusCode = response.getStatusLine().getStatusCode();
vitalsResponseText = EntityUtils.toString(response.getEntity());
}
catch(ClientProtocolException e){
e.printStackTrace();
}
catch (IOException e){
e.printStackTrace();
}
return vitalsResponseText;
}
protected void onPostExecute(String responseText){
if(activity == null){
//please handle this state because it might happen
}
Intent intent = new Intent(activity, VitalListActivity.class);
intent.putExtra(VITAL_RESPONSE,responseText);
Log.d("putextra","success");
activity.startActivity(intent);
}
}