我有一个应用程序，它由一个 tabhost 组成。我正在使用 aAsyncTask在后台执行一些互联网工作。现在在 中onPostExecute，我希望它开始一个新的活动。当我创建一个新意图时，会显示新活动，但没有选项卡..它只是活动。
现在我已经在线阅读了如何做到这一点，并且我已经设法进入了我认为的正确方向。这是整个代码：
package com.appsoweb.kvodeventer;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ActivityGroup;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class KVOMeldingen extends ActivityGroup {
public static final JSONObject jsonResult = null;
Button bLogin, bCreateAccount, bResetPassword;
EditText etUsername, etPassword;
static String Username;
static String Password;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.meldingen);
final EditText etUsername = (EditText) findViewById(R.id.etUsername);
final EditText etPassword = (EditText) findViewById(R.id.etPassword);
Button bLogin = (Button) findViewById(R.id.bLogin);
Button bCreateAccount = (Button) findViewById(R.id.bCreateAccount);
Button bResetPassword = (Button) findViewById(R.id.bResetPassword);
bLogin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (etUsername.length() <= 0) {
etUsername.setError("Veld mag niet leeg zijn");
} else if (etPassword.length() <= 0) {
etPassword.setError("Veld mag niet leeg zijn");
} else {
Username = etUsername.getText().toString();
Password = etPassword.getText().toString();
}
LoginTask NDLT = new LoginTask();
NDLT.execute();
}
});
bCreateAccount.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// Doe iets hier.......
}
});
bResetPassword.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Doe iets hier........
}
});
}
public static String getUsername() {
return Username;
}
public static String getPassword() {
return Password;
}
class LoginTask extends AsyncTask<Void, Void, JSONObject> {
ProgressDialog waitingDialog;
@Override
protected void onPreExecute() {
waitingDialog = new ProgressDialog(KVOMeldingen.this);
waitingDialog.setMessage("Laden...");
waitingDialog.show();
super.onPreExecute();
}
@Override
protected JSONObject doInBackground(Void... params) {
JSONObject json = JsonFunctionLogin
.getJsonLoginResult("http://api.crossalertdeventer.nl/login.json");
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
super.onPostExecute(json);
if (waitingDialog.isShowing()) {
waitingDialog.dismiss();
Log.d("iets gebeurt", "gedaan");
}
try {
String LoginResult = json.getString("login");
String UserIdResult = json.getString("user_id");
Log.d("LoginResult", LoginResult);
Log.d("LoginUserId", UserIdResult);
json = null;
Intent intent = new Intent(KVOMeldingen.this, KVOCards.class);
View view = getLocalActivityManager().startActivity("KVOCards", intent
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
.getDecorView();
replaceView(view);
} catch (Exception e) {
Log.e("KVOMeldingen", "error" + e.getMessage());
}
}
public void replaceView(View v){
setContentView(v);
}
}
}
如您所见：我创建了一个视图，它将通过Intent 显示。但是意图在背景后不会启动。它给了我一个错误：
无法启动 Activity componentInfo 无法添加窗口...令牌.....无效...您的应用程序正在运行吗？
我究竟做错了什么？
提前谢谢