Question

我正在我的应用程序上构建一个注册区域，一切正常。

我正在使用PHP来插入，而Java用于获取值，因此，希望将值从EditTexts传递到AsynkTask类并将它们提交到我的数据库。

我该怎么做？

public class register extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);

        final EditText e_id=(EditText) findViewById(R.id.editText1);
        final EditText e_name=(EditText) findViewById(R.id.editText2);
        Button clickButton = (Button) findViewById(R.id.button1);
        clickButton.setOnClickListener( new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        insert_user mTask = new insert_user();
                        mTask.execute("I WOULD LIKE TO PUT THE EDITTEXT VALUE HERE");

                        // TODO Auto-generated method stub
                    }
                });
    }


    class insert_user extends AsyncTask<String, Integer, String> {

        // Runs in UI before background thread is called
        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            // Do something like display a progress bar
        }

        // This is run in a background thread
        @Override
        protected String doInBackground(String... params) {
            String passed = params[0];
            ArrayList<NameValuePair> nameValuePairs = new 

            ArrayList<NameValuePair>();


            nameValuePairs.add(new BasicNameValuePair("id","1"));
            nameValuePairs.add(new BasicNameValuePair("name",passed));

            InputStream is = null;
            try
            {
                 HttpClient httpclient = new DefaultHttpClient();
                 HttpPost httppost = new HttpPost("http://10.0.2.2/example/insert.php");
                 httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                 HttpResponse response = httpclient.execute(httppost); 
                 HttpEntity entity = response.getEntity();
                 is = entity.getContent();
                 Log.e("pass 1", "connection success ");
             }
             catch(Exception e)
             {
                 Log.e("Fail 1", e.toString());

             }     

             String result = null;
            try
            {
                 BufferedReader reader = new BufferedReader
            (new InputStreamReader(is,"iso-8859-1"),8);
                 StringBuilder sb = new StringBuilder();
                 String line;
                while ((line = reader.readLine()) != null)
                 {
                     sb.append(line + "\n");
                 }
                 is.close();
                 result = sb.toString();
                 Log.e("pass 2", "connection success ");
             }
             catch(Exception e)
             {
                  Log.e("Fail 2", e.toString());
             }     

             try
             {
                  JSONObject json_data = new JSONObject(result);
                  String id = json_data.getString("id");
                  String name =json_data.getString("name");
             }
             catch(Exception e)
             {
                 Log.e("Fail 3", e.toString());
             }
            return result;

    }
        // This runs in UI when background thread finishes
        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);

            // Do things like hide the progress bar or change a TextView

        }
    }
}

Answer 1

您可以覆盖构造函数。类似的东西：

class insert_user extends AsyncTask<String, Integer, String> {

    String mText;

    public insert_user(String text) {
        super();
        mText = text;       // save the value
    }

    protected String doInBackground(String... params) {
        // do something with mText
        ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();


        nameValuePairs.add(new BasicNameValuePair("id","1"));
        nameValuePairs.add(new BasicNameValuePair("name",mText));

。。

    }

.
.
.
}

然后

实例化并运行

 insert_user mTask = new insert_user("EditText Value");
 mTask.execute();

要读取e_name值：

insert_user mTask = new insert_user(e_name.getText().toString());
mTask.execute();

这将设置AsyncTask生命周期的值，包括预执行。

如果你只需要doInBackground中的String值，那么你可以直接传递一个参数数组，Android: How can I pass parameters to AsyncTask's onPreExecute()?上的精彩文章

Answer 2

您传递edittext信息的方式似乎是正确的。你有撞车事吗？你可以发布logcat信息吗？

Answer 3

您可以直接在doInBackGround（）方法中使用这两行代码，并从这些字段中提取EditText的内容。

final EditText e_id=(EditText) findViewById(R.id.editText1);
final EditText e_name=(EditText) findViewById(R.id.editText2);

// Extracting content
String eid = e_id.getText().toString();
String ename = e_name.getText().toString();

这是最简单的解决方案。另一种选择是通过AsyncTask构造函数传递它们。

如何将EditText值传递给AsyncTask

3 个答案: