public class AddStudentActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_student);
}
public void add2(View view){
//create 3 editText , 1 Textview
EditText et_name, et_age;
RadioButton rb_male;
TextView tv_msg;
//bind with xml widget
et_name = (EditText)findViewById(R.id.et_name);
et_age = (EditText)findViewById(R.id.et_age);
rb_male = (RadioButton)findViewById(R.id.rb_male);
tv_msg = (TextView)findViewById(R.id.tv_msg);
//retrieve values
String name = et_name.getText().toString();
String age = et_age.getText().toString();
String gender = "";
if (rb_male.isChecked())
gender = "male";
else
gender = "female";
//call php
new AddStudent(this, tv_msg).execute(name, age, gender);
}
}
class AddStudent extends AsyncTask<String, Void, String> {
private Context context;
//CHANGE HERE....ADD PARAMATER
TextView tv_msg;
public AddStudent(Context context,TextView tv_msg) {
this.context = context;
this.tv_msg = tv_msg;
}
@Override
protected String doInBackground(String[] arg) {
//CHANGE HERE ...... RETRIEVE STRING ARGUMENTS
String name = arg[0];
String age = arg[1];
String gender = arg[2];
String link;
String data;
BufferedReader bufferedReader;
String result;
try {
//CHANGE HERE .... PARAMETERS
data = "?name=" + URLEncoder.encode(name, "UTF-8");
data += "&age="+ URLEncoder.encode(age, "UTF-8");
data += "&gender="+ URLEncoder.encode(gender, "UTF-8");
//CHANGE HERE .... PHP PAGE
link = "http://10.0.2.2/fashionstudio/ADD3.php" + data;
URL url = new URL(link);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8"));
result = bufferedReader.readLine();
return result;
} catch (Exception e) {
Log.d("msg here", e.getMessage());
Toast.makeText(context, "Error Exception", Toast.LENGTH_SHORT).show();
return new String("Exception: " + e.getMessage());
}
}
@Override
protected void onPostExecute(String result) {
if (result != null) {
try {
JSONObject reader = new JSONObject(result);
//CHANGE HERE... RETRIEVE VALUES
String msg = reader.getString("msg");
tv_msg.setText(msg);
} catch (Exception e) {
e.printStackTrace();
Log.d("msg here", e.getMessage());
Toast.makeText(context, "Error parsing JSON data.", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(context, "Couldn't get any JSON data.", Toast.LENGTH_SHORT).show();
}
}
}
我得到一个错误,当我在android系统不能()内螺纹已不叫Looper.prepare创建处理机3
E/AndroidRuntime点击添加学生:致命异常:#的AsyncTask 1 进程:com.example.lenovo.yuwilson,PID:22199 java.lang.RuntimeException:在java执行doInBackground()时发生错误android.os.AsyncTask $ 3.done(AsyncTask.java:300) 。 util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) at java.util.concurrent.Futur eTask.setException(FutureTask.java:222) 在java.util.concurrent.FutureTask.run(FutureTask.java:242) 在android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:231) 是java .util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 在java.util.concurrent.ThreadPoolExecutor中的$ Worker.run(ThreadPoolExecutor.java:587) 在java.lang.Thread.run(Thread.java:841 ) 引起:java.lang.RuntimeException:无法在android.os.Handler的android.os.Handler。(Handler.java:208) 未调用Looper.prepare() 的线程中创建处理程序。 (Handler.java:122) at android.widget.Toast $ TN。(Toast.java:341) at android.w idget.Toast。(Toast.java:96) 在android.widget.Toast.makeText(Toast.java:245) 在com.example.lenovo.yuwilson.AddStudent.doInBackground(AddStudentActivity.java:94) 在玉米(FutureTask.java:.example.lenovo.yuwilson.AddStudent.doInBackground(AddStudentActivity.java:54) at android.os.AsyncTask $ 2.call(AsyncTask.java:288) at java.util.concurrent.FutureTask.run(FutureTask.java: 237) at android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor $ Worker .run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:841)
有人帮我解决一下吗?
的[无法创建内螺纹处理可能的复制这还没有调用Looper.prepare()](http://stackoverflow.com/questions/3875184/cant-create-handler-inside-thread-that-has-not-called-looper-prepare) –
@余Wil儿子如果它满足您的请求,请考虑接受下面的答案之一 – Lino