我已经写了一个小应用程序，如果它关闭，将切换3G数据和Tethering，如果它打开则相反关闭。一切正常，但没有主屏幕，应用程序只是启动，做它的事情并完成。我现在想在第一次运行时发出介绍性警报（从文件读取运行计数）。
我的问题是虽然执行了警告对话框但没有显示任何内容，所以很明显我错过了一些东西。
我到目前为止看到的所有示例都触发了一个按钮点击，而这个应用程序没有按钮或屏幕。任何帮助将不胜感激。
这是java代码
package com.example.hotspot;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends Activity {
//public final static String EXTRA_MESSAGE = "com.example.hotspot.MESSAGE";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Integer idata = 0;
Context context = getApplicationContext();
idata = readFile("hotspot.dat");
//if (idata == 1) {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Title");
builder.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
}
});
builder.setMessage("Do you want to continue");
AlertDialog dialog = builder.create();
dialog.show();
//}
try { the stuff that works ok ……….
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.hotspot"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
}
<application
android:allowBackup="true"
android:icon="@drawable/myhotspot"
android:label="@string/app_name"
android:theme="@android:style/Theme.Dialog">
<activity
android:name="com.example.hotspot.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
03-17 21:16:34.530: E/WindowManager(735): android.view.WindowLeaked: Activity com.example.hotspot.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{b3db15e0 V.E..... R.....ID 0,0-480,291} that was originally added here
03-17 21:16:34.530: E/WindowManager(735): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:346)
03-17 21:16:34.530: E/WindowManager(735): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
03-17 21:16:34.530: E/WindowManager(735): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
03-17 21:16:34.530: E/WindowManager(735): at android.app.Dialog.show(Dialog.java:286)
03-17 21:16:34.530: E/WindowManager(735): at com.example.hotspot.MainActivity.onCreate(MainActivity.java:44)
03-17 21:16:34.530: E/WindowManager(735): at android.app.Activity.performCreate(Activity.java:5243)
03-17 21:16:34.530: E/WindowManager(735): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-17 21:16:34.530: E/WindowManager(735): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
03-17 21:16:34.530: E/WindowManager(735): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
03-17 21:16:34.530: E/WindowManager(735): at android.app.ActivityThread.access$700(ActivityThread.java:135)
03-17 21:16:34.530: E/WindowManager(735): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
03-17 21:16:34.530: E/WindowManager(735): at android.os.Handler.dispatchMessage(Handler.java:102)
03-17 21:16:34.530: E/WindowManager(735): at android.os.Looper.loop(Looper.java:137)
03-17 21:16:34.530: E/WindowManager(735): at android.app.ActivityThread.main(ActivityThread.java:4998)
03-17 21:16:34.530: E/WindowManager(735): at java.lang.reflect.Method.invokeNative(Native Method)
03-17 21:16:34.530: E/WindowManager(735): at java.lang.reflect.Method.invoke(Method.java:515)
03-17 21:16:34.530: E/WindowManager(735): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
03-17 21:16:34.530: E/WindowManager(735): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
03-17 21:16:34.530: E/WindowManager(735): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
单击正数按钮时，您必须关闭对话框
dialog.dismiss();
并删除＆＃34;尝试{＆＃34;你放在代码的末尾。首先在对话框构建器工作时编码，然后对其他所有内容进它在我的项目中运作良好。
您可以使用此链接查询有关对话框的问题！ http://developer.android.com/guide/topics/ui/dialogs.html
古德勒克。