我的android应用程序中有一个登录页面和主菜单。在我的登录页面中，用户必须输入appcode，用户名和电子邮件。其中三个值具有单独的验证。
成功登录系统后，如果用户单击后退按钮，则用户无法返回登录页面。我在登录页面中添加了finish();
。
如果用户点击后退按钮消息框提示并询问用户是否需要退出应用程序？
public void alertDialog() {
new AlertDialog.Builder(MainMenuActivity.this)
.setTitle("Message")
.setMessage("Do you want to exit the from app?")
.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
@TargetApi(11)
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
finish();
}
})
.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@TargetApi(11)
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
}).show();
}
如果没有用户停留且没有用户离开应用程序，并且重新启动用户需要重新输入其详细信息并继续。
除验证部分外，所有这些功能都在起作用。
如果我输入无效数据以继续应用，则会显示错误消息并关闭应用。
这是我的logcat。
09-01 10:39:56.541 8659-8659/? I/art﹕ Not late-enabling -Xcheck:jni (already on)
09-01 10:39:57.001 8659-8674/com.NICT.nict D/OpenGLRenderer﹕ Use EGL_SWAP_BEHAVIOR_PRESERVED: true
09-01 10:39:57.003 8659-8659/com.NICT.nict D/﹕ HostConnection::get() New Host Connection established 0xb42b3e60, tid 8659
09-01 10:39:57.013 8659-8659/com.NICT.nict D/Atlas﹕ Validating map...
09-01 10:39:57.048 8659-8674/com.NICT.nict D/﹕ HostConnection::get() New Host Connection established 0xb42b3fe0, tid 8674
09-01 10:39:57.063 8659-8674/com.NICT.nict I/OpenGLRenderer﹕ Initialized EGL, version 1.4
09-01 10:39:57.083 8659-8674/com.NICT.nict D/OpenGLRenderer﹕ Enabling debug mode 0
09-01 10:39:57.100 8659-8674/com.NICT.nict W/EGL_emulation﹕ eglSurfaceAttrib not implemented
09-01 10:39:57.100 8659-8674/com.NICT.nict W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xb43a9700, error=EGL_SUCCESS
09-01 10:40:03.606 8659-8659/com.NICT.nict W/IInputConnectionWrapper﹕ showStatusIcon on inactive InputConnection
09-01 10:40:04.017 8659-8723/com.NICT.nict I/System.out﹕ http://demo.et.lk/nitcapi/api/login///
09-01 10:40:04.017 8659-8723/com.NICT.nict I/System.out﹕ Creation of json object failed
我该怎么办？
CNC中 验证码，
loginBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!ServiceHandler.isOnline(getApplicationContext())) {
MessageHandler.showMessage("No network connection",
getApplicationContext());
}
new Thread(new Runnable() {
public void run() {
Looper.prepare();
String code = codeEdit.getText().toString();
String email = emailEdit.getText().toString();
String name = nameEdit.getText().toString();
if (code.length() == 0) {
runOnUiThread(new Runnable() {
public void run() {
MessageHandler.showMessage(
"Please Enter the app code",
getApplicationContext());
errorStatus = true;
}
});
;
} else if (name.length() == 0) {
runOnUiThread(new Runnable() {
public void run() {
MessageHandler.showMessage(
"Please Enter Your Name",
getApplicationContext());
errorStatus = true;
}
});
;
} else if (email.length() == 0) {
runOnUiThread(new Runnable() {
public void run() {
MessageHandler.showMessage(
"Please Enter Your Email",
getApplicationContext());
errorStatus = true;
}
});
;
}
EmailValidator emailValidator = new EmailValidator();
if(!emailValidator.validate(email)){
runOnUiThread(new Runnable() {
public void run() {
MessageHandler.showMessage(
"Invalid Email",
getApplicationContext());
errorStatus = true;
}
});
;
}
- Diyoda的编辑 -
package com.NICT.nict.services;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class ServiceHandler {
static String response = null;
public final static int GET = 1;
public final static int POST = 2;
public ServiceHandler() {
}
/**
* Making service call
*
* @url - url to make request
* @method - http request method
* */
public String makeServiceCall(String url, int method) {
return this.makeServiceCall(url, method, null);
}
/**
* Making service call
*
* @url - url to make request
* @method - http request method
* @params - http request params
* */
public String makeServiceCall(String url, int method,
List<NameValuePair> params) {
try {
// http client
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity httpEntity = null;
HttpResponse httpResponse = null;
// Checking http request method type
if (method == POST) {
HttpPost httpPost = new HttpPost(url);
// adding post params
if (params != null) {
httpPost.setEntity(new UrlEncodedFormEntity(params));
}
httpResponse = httpClient.execute(httpPost);
} else if (method == GET) {
// appending params to url
if (params != null) {
String paramString = URLEncodedUtils
.format(params, "utf-8");
url += "?" + paramString;
}
HttpGet httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
}
httpEntity = httpResponse.getEntity();
response = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return response;
}
public static boolean isOnline(Context ctx) {
ConnectivityManager cm;
NetworkInfo info = null;
try {
cm = (ConnectivityManager) ctx
.getSystemService(Context.CONNECTIVITY_SERVICE);
info = cm.getActiveNetworkInfo();
} catch (Exception e) {
e.printStackTrace();
}
return (info!=null&&!info.equals(null));
}
}
为Diyoda编辑3
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background"
android:fillViewport="true"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ProgressBar
android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:indeterminate="false" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="@dimen/login_land_layout_margin"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:contentDescription="@string/logo"
android:src="@drawable/ic_logo" />
<EditText
android:id="@+id/codeEdit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:ems="10"
android:hint="@string/code"
android:textColorHint="#FFFFFF"
android:inputType="textPassword" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/nameEdit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:ems="10"
android:hint="@string/name"
android:textColorHint="#FFFFFF"
android:inputType="textPersonName" />
<EditText
android:id="@+id/emailEdit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:ems="10"
android:hint="@string/email"
android:textColorHint="#FFFFFF"
android:inputType="textEmailAddress" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/login_land_margin_both"
android:layout_marginRight="@dimen/login_land_margin_both"
android:orientation="vertical" >
<Button
android:id="@+id/loginBtn"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="30dp"
android:background="#0f4b9b"
android:text="@string/login"
android:textColor="@color/LoginButtonColor" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" >
<ImageView
android:id="@+id/poweredBy"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="@drawable/poweredby"
android:layout_alignParentBottom="true"
android:scaleType="center"
/>
</LinearLayout>
</RelativeLayout>
这是logcat。
09-01 14:16:17.792 27281-27281/com.NICT.nict D/dalvikvm﹕ GC_FOR_ALLOC freed 15742K (120399), 50% free 18992K/37328K, paused 59ms, total 64ms
09-01 14:16:17.803 27281-27291/com.NICT.nict I/System.out﹕ [CDS]close[60594]
09-01 14:16:17.804 27281-27291/com.NICT.nict I/System.out﹕ close [socket][/0.0.0.0:60594]
09-01 14:16:17.805 27281-27291/com.NICT.nict I/System.out﹕ close [socket][/0.0.0.0:60594]
09-01 14:16:25.170 27281-27281/com.NICT.nict I/View﹕ Touch down dispatch to android.widget.Button{438bb780 VFED..C. ........ 0,30-440,78 #7f090022 app:id/loginBtn}, event = MotionEvent { action=ACTION_DOWN, id[0]=0, x[0]=190.54907, y[0]=23.447815, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=106787772, downTime=106787772, deviceId=2, source=0x1002 }
09-01 14:16:25.492 27281-27281/com.NICT.nict I/View﹕ Touch up dispatch to android.widget.Button{438bb780 VFED..C. ...P.... 0,30-440,78 #7f090022 app:id/loginBtn}, event = MotionEvent { action=ACTION_UP, id[0]=0, x[0]=190.54907, y[0]=23.447815, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=106788116, downTime=106787772, deviceId=2, source=0x1002 }
09-01 14:16:25.493 27281-27281/com.NICT.nict V/Provider/Settings﹕ get setting for user 0 by user 0 so skipping cache
09-01 14:16:25.493 27281-27281/com.NICT.nict V/Provider/Settings﹕ from settings cache , name = sound_effects_enabled , value = 0
09-01 14:16:25.499 27281-27281/com.NICT.nict D/dalvikvm﹕ create interp thread : stack size=128KB
09-01 14:16:25.499 27281-27281/com.NICT.nict D/dalvikvm﹕ create new thread
09-01 14:16:25.500 27281-27281/com.NICT.nict D/dalvikvm﹕ new thread created
09-01 14:16:25.500 27281-27281/com.NICT.nict D/dalvikvm﹕ update thread list
09-01 14:16:25.500 27281-28060/com.NICT.nict D/dalvikvm﹕ threadid=17: interp stack at 0x55711000
09-01 14:16:25.500 27281-28060/com.NICT.nict D/dalvikvm﹕ init ref table
09-01 14:16:25.500 27281-28060/com.NICT.nict D/dalvikvm﹕ init mutex
09-01 14:16:25.500 27281-28060/com.NICT.nict D/dalvikvm﹕ threadid=17: created from interp
09-01 14:16:25.500 27281-27281/com.NICT.nict D/dalvikvm﹕ start new thread
09-01 14:16:25.501 27281-28060/com.NICT.nict D/dalvikvm﹕ threadid=17: notify debugger
09-01 14:16:25.501 27281-28060/com.NICT.nict D/dalvikvm﹕ threadid=17 (Thread-1149): calling run()
09-01 14:16:25.514 27281-28060/com.NICT.nict D/dalvikvm﹕ threadid=17: exiting
09-01 14:16:25.514 27281-28060/com.NICT.nict D/dalvikvm﹕ threadid=17: bye!
答案 0 :(得分：0)
将对话框添加到主菜单。
public void alertDialog() {
new AlertDialog.Builder(MainMenuActivity.this)
.setTitle("Message")
.setMessage("Do you want to exit the from app?")
.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
@TargetApi(11)
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
finish();
}
})
.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@TargetApi(11)
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
}).show();
}