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您好我只想訪問從api獲取的字符串值到onCreate方法。我在下面發佈我的代碼。在getName類中，我正確地獲取名稱，但無法訪問oncreate方法中的值。我想將名稱設置爲Welcome Admin。我在getName類中嘗試了這段代碼，但它調用了兩次，因此它在導航抽屜中顯示兩次。爲了避免這種情況，我只想訪問onCreate方法中的字符串值。先謝謝你。從異步方法訪問值onCreate（）
package com.abc;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.R.*;
import android.app.ActionBar;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.AsyncTask;
import android.os.BaseBundle;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.FrameLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class navigation_drawer_class extends Activity
{
private static final int Copy = 0;
int a =0;
public static FrameLayout frameLayout;
TextView mytextview;
public static ListView mDrawerList;
public static String Fullname;
public DrawerLayout mDrawerLayout;
String str_Data="";
protected String[] listArray = {"A","B","C","D ","E","F"," G"};
protected static int position;
private static boolean isLaunch = true;
JSONObject post_details_obj,post_obj;
public static String FIRST_NAME="first_name",LAST_NAME="last_name",PROFILE_IMAGE="image_name";
JSONArray staff_data_array;
private ActionBarDrawerToggle actionBarDrawerToggle;
Operation op=new Operation();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//------------------ THIS ONE -------------------------
getActionBar().setHomeAsUpIndicator(R.drawable.crop3);//THIS ONE FOR THE DRAWER LOGO
//--------------------- THIS ONE ----------------------
frameLayout = (FrameLayout)findViewById(R.id.content_frame);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listArray));
new getname.execute();
mDrawerList.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id)
{
position -= mDrawerList.getHeaderViewsCount();//THIS ONE FOR THE FIRST ITEM AS TITLE
openActivity(position);
}
});
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
actionBarDrawerToggle = new ActionBarDrawerToggle(
this, // host Activity
mDrawerLayout, // DrawerLayout object
R.drawable.ic_launcher, // nav drawer image to replace 'Up' caret
R.string.open_drawer, // "open drawer" description for accessibility
R.string.close_drawer) // "close drawer" description for accessibility
{
@Override
public void onDrawerClosed(View drawerView)
{
getActionBar().setTitle(listArray[position]);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
super.onDrawerClosed(drawerView);
}
@Override
public void onDrawerOpened(View drawerView)
{
getActionBar().setTitle(getString(R.string.app_name));
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
super.onDrawerOpened(drawerView);
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset)
{
super.onDrawerSlide(drawerView, slideOffset);
}
@Override
public void onDrawerStateChanged(int newState)
{
super.onDrawerStateChanged(newState);
}
};
mDrawerLayout.setDrawerListener(actionBarDrawerToggle);
if(isLaunch){
isLaunch = false;
openActivity(0);
}
}
protected void openActivity(int position) {
mDrawerLayout.closeDrawer(mDrawerList);
navigation_drawer_class.position = position; //Setting currently selected position in this field so that it will be available in our child activities.
switch (position) {
case 0:
startActivity(new Intent(this, A.class));
break;
default:
break;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// getMenuInflater().inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
if (actionBarDrawerToggle.onOptionsItemSelected(item))
{
return true;
}
switch (item.getItemId())
{
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu)
{
return super.onPrepareOptionsMenu(menu);
}
/* We can override onBackPressed method to toggle navigation drawer*/
@Override
public void onBackPressed()
{
if(mDrawerLayout.isDrawerOpen(mDrawerList))
{
mDrawerLayout.closeDrawer(mDrawerList);
}
else
{
mDrawerLayout.openDrawer(mDrawerList);
}
}
private class getname extends AsyncTask<Void, Void, JSONArray>
{
Dialog dialog;
@Override
public void onPreExecute()
{
dialog = new Dialog(navigation_drawer_class.this,android.R.style.Theme_Translucent_NoTitleBar);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.progressbar);
dialog.show();
}
@Override
protected JSONArray doInBackground(Void... params)
{
String STAFF_URL=op.getUrl(getApplicationContext(),"staff","get_staff_details","");
staff_data_array = JSONfunctions.getJSONfromURL(STAFF_URL+"&vis_encode=json",navigation_drawer_class.this);
return staff_data_array;
}
@Override
public void onPostExecute(JSONArray staff_data_array)
{
super.onPostExecute(staff_data_array);
String staff_data_result =staff_data_array.toString();
try {
post_obj = staff_data_array.getJSONObject(0);
String fname=post_obj.getString(FIRST_NAME);
String lname=post_obj.getString(LAST_NAME);
String image=post_obj.getString(PROFILE_IMAGE);
String fullname =fname;
Fullname="Welcome "+fullname;
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
dialog.dismiss();
}
}
}
你不能從onCreate訪問這個 - 你不能假設'getname'任務已經完成。唯一安全的方法是設置'getname'的onPostExecute的值，只有這樣你才知道你有價值。從那裏你應該把價值放在你想要的地方。 – yakobom
訪問onCreate方法中的字符串值真的是個壞主意，因爲asyncTask需要一些時間才能獲得執行並獲取用戶名信息。而且你必須做一些錯誤的事情，因爲上面的代碼名稱只存儲在變量中一次。 –
@yakobom：如何設置onPostExecute的值？你可以給我一個例子嗎。 Bcoz我是android新手。 –