当没有可触发的按钮时，java警报对话框不工作

6 月，1 周 Questions & Answers 170

我写了一个小应用程序，如果关闭，它将打开3G数据和连接，如果打开，它将关闭。这一切都很好，但没有主屏幕，应用程序只是启动，完成它的事情和完成。现在，我想在第一次运行时发出一个介绍性警报（从文件读取的运行计数）

我的问题是，虽然执行了警报对话框，但它没有显示任何内容，因此我显然遗漏了一些内容

到目前为止，我看到的所有示例都会触发按钮点击，而这个应用程序没有按钮或屏幕。任何帮助都将不胜感激

下面是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 安卓.app.Activity;
import 安卓.app.AlertDialog;
import 安卓.content.Context;
import 安卓.content.DialogInterface;
import 安卓.net.ConnectivityManager;
import 安卓.net.NetworkInfo;
import 安卓.net.wifi.WifiManager;
import 安卓.os.Bundle;
import 安卓.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 ……….

主要活动。xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
    xmlns:tools="http://schemas.安卓.com/tools"
    安卓:layout_width="match_parent"
    安卓:layout_height="match_parent"
    安卓:orientation="horizontal">
</LinearLayout>

AndroidManifest。xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
    package="com.example.hotspot"
    安卓:versionCode="1"
    安卓:versionName="1.0" >

    <uses-sdk
        安卓:minSdkVersion="10"
        安卓:targetSdkVersion="18" />
    <uses-permission 安卓:name="安卓.permission.CHANGE_WIFI_STATE"/>
    <uses-permission 安卓:name="安卓.permission.ACCESS_WIFI_STATE"/>
    <uses-permission 安卓:name="安卓.permission.INTERNET"/>
    <uses-permission 安卓:name="安卓.permission.CHANGE_NETWORK_STATE"/>
    <uses-permission 安卓:name="安卓.permission.ACCESS_NETWORK_STATE"/>
   }


    <application
        安卓:allowBackup="true"
        安卓:icon="@drawable/myhotspot"
        安卓:label="@string/app_name"
        安卓:theme="@安卓:style/Theme.Dialog">

        <activity
            安卓:name="com.example.hotspot.MainActivity"
            安卓:label="@string/app_name" >
            <intent-filter>
                <action 安卓:name="安卓.intent.action.MAIN" />
                <category 安卓:name="安卓.intent.category.LAUNCHER" />
            </intent-filter>          
        </activity>   
     </application>
</manifest>

这是错误日志

03-17 21:16:34.530: E/WindowManager(735): 安卓.view.WindowLeaked: Activity com.example.hotspot.MainActivity has leaked window com.安卓.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 安卓.view.ViewRootImpl.<init>(ViewRootImpl.java:346)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.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 安卓.app.Activity.performCreate(Activity.java:5243)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.app.ActivityThread.access$700(ActivityThread.java:135)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.os.Handler.dispatchMessage(Handler.java:102)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.os.Looper.loop(Looper.java:137)
03-17 21:16:34.530: E/WindowManager(735):   at 安卓.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.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
03-17 21:16:34.530: E/WindowManager(735):   at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:593)
03-17 21:16:34.530: E/WindowManager(735):   at dalvik.system.NativeStart.main(Native Method)

Python中文网

有 Java 编程相关的问题?

当没有可触发的按钮时，java警报对话框不工作

主要活动。xml

AndroidManifest。xml

这是错误日志

共 (1) 个答案

# 1 楼答案