最近很多小伙伴都在问android–java.lang.RuntimeException：无法在未调用Looper.prepare()的线程内创建处理程序这两个问题，那么本篇文章就来给大家详细解答一下
最近很多小伙伴都在问android – java.lang.RuntimeException：无法在未调用Looper.prepare()的线程内创建处理程序这两个问题，那么本篇文章就来给大家详细解答一下，同时本文还将给你拓展Android FATAL EXCEPTION MAIN：java.lang.RuntimeException：无法启动活动ComponentInfo、Android java.lang.RuntimeException：无法实例化活动ComponentInfo … java.lang.NullPointerException、android – Gson中的RuntimeException解析JSON：无法调用受保护的java.lang.ClassLoader()而没有args、android – java.lang.RuntimeException无法实例化服务：java.lang.NullPointerException等相关知识，下面开始了哦！
本文目录一览：- android – java.lang.RuntimeException：无法在未调用Looper.prepare()的线程内创建处理程序
- Android FATAL EXCEPTION MAIN：java.lang.RuntimeException：无法启动活动ComponentInfo
- Android java.lang.RuntimeException：无法实例化活动ComponentInfo … java.lang.NullPointerException
- android – Gson中的RuntimeException解析JSON：无法调用受保护的java.lang.ClassLoader()而没有args
- android – java.lang.RuntimeException无法实例化服务：java.lang.NullPointerException
android – java.lang.RuntimeException：无法在未调用Looper.prepare()的线程内创建处理程序
嗨,我的代码有问题.我的代码是
progressD = ProgressDialog.show(MenuUtama.this,"","Uploading files to server.....",false);
Thread thread = new Thread(new Runnable(){
public void run(){
//doFileUpload();
try {
// setiap parameter yang akan dikirim melalui http
// harus encode agar
// dapat terbaca dengan baik oleh server
Cursor c = helper.getAll1(almagId);
Cursor cr = helper.getUpImage(almagId);
if(c.movetoFirst()){
//progressD = ProgressDialog.show(context,title,message)
do{
String kdstore = URLEncoder.encode(helper.getKdStore(c).toString(),"utf-8");
String nama = URLEncoder.encode(helper.getNama(c).toString(),"utf-8");
String alamat = URLEncoder.encode(helper.getAlamat(c).toString(),"utf-8");
String kdpos = URLEncoder.encode(helper.getKdPos(c).toString(),"utf-8");
String notelp = URLEncoder.encode(helper.getNotel(c).toString(),"utf-8");
String lng = URLEncoder.encode(helper.getlng(c).toString(),"utf-8");
String lat = URLEncoder.encode(helper.getLat(c).toString(),"utf-8");
String perush = URLEncoder.encode(helper.getPerus(c).toString(),"utf-8");
//String gambar = URLEncoder.encode(helper.getGamb(c).toString(),"utf-8");
//Toast.makeText(this,kdstore,Toast.LENGTH_LONG).show();
//System.out.println(gambar);
url += "?kode_toko=" + kdstore + "&&nama=" + nama + "&&alamat=" + alamat +
"&&kode_pos=" + kdpos + "&&no_telp=" + notelp + "&&longitude=" + lng + "&&latitude=" + lat +
"&&perusahaan=" + perush;
getRequest(url);
url = "http://10.234.165.232/upload_get.PHP";
}while(c.movetoNext());
}
if(cr.movetoFirst()){
do{
String kdstore = URLEncoder.encode(helper.getKdstore1(cr),"utf-8");
String gambar = URLEncoder.encode(helper.getGam1(cr),"utf-8");
url1 += "?kode_toko1=" + kdstore + "&&gambar1=" + gambar;
getRequest1(url1);
url1 = "http://10.234.165.232/upload_get2.PHP";
}while(cr.movetoNext());
}
} catch (UnsupportedEncodingException e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
MenuUtama.this.runOnUiThread(new Runnable(){
public void run() {
if(progressD.isShowing())
progressD.dismiss();
}
});
}
});
thread.start();
return(true);
和这样的错误：
FATAL EXCEPTION: Thread-9
java.lang.RuntimeException:
Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:121)
at android.widget.Toast.<init>(Toast.java:68)
at android.widget.Toast.makeText(Toast.java:231)
at com.sat.alfaloc.MenuUtama.getRequest(MenuUtama.java:160)
at com.sat.alfaloc.MenuUtama$1.run(MenuUtama.java:101)
at java.lang.Thread.run(Thread.java:1096)
如果活动将数据保存到服务器我命令进度条可以运行,但如果没有这不起作用..我应该怎么做才能解决这个问题？
解决方法
由于您正在使用活动上下文的线程,您可能会收到错误.
您应该使用AsyncTask而不是普通线程.
在AsyncTask中,有一个onPreExecute()和onPostExecute()方法,它们在主线程上执行,并且有一个方法doInBackground()将在后台执行,以便您可以轻松实现长期进程.
你可以参考this example
Android FATAL EXCEPTION MAIN：java.lang.RuntimeException：无法启动活动ComponentInfo
我是编程android的nubie,我知道这里有4m是很多页面为我的问题打乱解决方案,但现在我输了2天仍然没有得到解决方案.请帮我！
首先是我的错误：
01-02 11:08:27.314: D/AndroidRuntime(1045): Shutting down VM
01-02 11:08:27.314: W/dalvikvm(1045): threadid=1: thread exiting with uncaught exception (group=0x409e61f8)
01-02 11:08:27.324: E/AndroidRuntime(1045): FATAL EXCEPTION: main
01-02 11:08:27.324: E/AndroidRuntime(1045): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.wifiscan/com.example.wifiscan.activity_wifi_scan}: java.lang.classNotFoundException: com.example.wifiscan.activity_wifi_scan
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:1880)
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.app.ActivityThread.access$600(ActivityThread.java:123)
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.os.Handler.dispatchMessage(Handler.java:99)
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.os.Looper.loop(Looper.java:137)
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.app.ActivityThread.main(ActivityThread.java:4424)
01-02 11:08:27.324: E/AndroidRuntime(1045): at java.lang.reflect.Method.invokeNative(Native Method)
01-02 11:08:27.324: E/AndroidRuntime(1045): at java.lang.reflect.Method.invoke(Method.java:511)
01-02 11:08:27.324: E/AndroidRuntime(1045): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-02 11:08:27.324: E/AndroidRuntime(1045): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-02 11:08:27.324: E/AndroidRuntime(1045): at dalvik.system.NativeStart.main(Native Method)
01-02 11:08:27.324: E/AndroidRuntime(1045): Caused by: java.lang.classNotFoundException: com.example.wifiscan.activity_wifi_scan
01-02 11:08:27.324: E/AndroidRuntime(1045): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
01-02 11:08:27.324: E/AndroidRuntime(1045): at java.lang.classLoader.loadClass(ClassLoader.java:501)
01-02 11:08:27.324: E/AndroidRuntime(1045): at java.lang.classLoader.loadClass(ClassLoader.java:461)
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
01-02 11:08:27.324: E/AndroidRuntime(1045): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:1871)
01-02 11:08:27.324: E/AndroidRuntime(1045): ... 11 more
我的WifiScan：
public class WifiScan extends Activity implements OnClickListener {
WifiManager wifi;
ListView lv;
TextView textStatus;
Button buttonScan;
int size = 0;
List<ScanResult> results;
String ITEM_KEY = "key";
ArrayList<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();
SimpleAdapter adapter;
/* Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wifi_scan);
buttonScan = (Button) findViewById(R.id.scan);
buttonScan.setonClickListener(this);
lv = (ListView)findViewById(R.id.list);
wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
if (wifi.isWifiEnabled() == false)
{
Toast.makeText(getApplicationContext(), "wifi is disabled..making it enabled", Toast.LENGTH_LONG).show();
wifi.setWifiEnabled(true);
}
wifi.startScan(); //js dopisal
// this.adapter = new SimpleAdapter(WiFiDemo.this, arraylist, R.layout.row, new String[] { ITEM_KEY }, new int[] { R.id.list_value });
lv.setAdapter(this.adapter);
registerReceiver(new broadcastReceiver()
{
@Override
public void onReceive(Context c, Intent intent)
{
results = wifi.getScanResults();
size = results.size();
}
}, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
}
public void onClick(View view)
{
arraylist.clear();
wifi.startScan();
Toast.makeText(this, "Scanning...." + size, Toast.LENGTH_SHORT).show();
try
{
size = size - 1;
while (size >= 0)
{
HashMap<String, String> item = new HashMap<String, String>();
item.put(ITEM_KEY, results.get(size).SSID + " " + results.get(size).capabilities);
arraylist.add(item);
size--;
adapter.notifyDataSetChanged();
}
}
catch (Exception e)
{ }
}
}
我的activity_wifi_scan.xml文件：
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/TableLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".WifiScan" >
<Button
android:id="@+id/scan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="scan"
android:text="SCAN" />
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</TableLayout>
和我的AndroidManifest文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.wifiscan"
android:versionCode="1"
android:versionName="1.0" >
<uses-premission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE"> </uses-permission>
<uses-permission android:name="android.permission.INTERNET"> </uses-permission>
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity android:name=".activity_wifi_scan">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
<category android:name="android.intent.category.LAUNCHER"></category>
<data />
</intent-filter>
</activity>
<receiver android:name=".activity_wifi_scan">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
<action android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
</intent-filter>
</receiver>
</application>
</manifest>
解决方法:
您的活动名称是WifiScan但您已将其声明为.activity_wifi_scan更改它并重试.
更改<活动>要素：
<activity android:name=".WifiScan">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
<category android:name="android.intent.category.LAUNCHER"></category>
<data />
</intent-filter>
</activity>
Android java.lang.RuntimeException：无法实例化活动ComponentInfo … java.lang.NullPointerException
出于某种原因,每次尝试启动我的应用程序时,我都会出现以下错误：
Unable to instantiate activity ComponentInfo{com.example.lifeahead/com.example.lifeahead.MainActivity}:java.lang.NullPointerException
我检查了清单文件,并添加了所有活动.
我启动应用程序时使用的唯一方法是：
private void logIn(){
Button logIn = (Button) findViewById(R.id.login);
logIn.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Todo Auto-generated method stub
Intent loginIntent = new Intent(MainActivity.this, HomeActivity.class);
loginIntent.putExtra("cmUN", cmUN);
loginIntent.putExtra("cmPW", cmPW);
startActivity(loginIntent);
}
});
}
这是onCreate：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
logIn();
}
完整日志：
Ë
/AndroidRuntime(1607): FATAL EXCEPTION: main
E/AndroidRuntime(1607): Process: com.example.lifeahead, PID: 1607
E/AndroidRuntime(1607): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.lifeahead/com.example.lifeahead.MainActivity}: java.lang.NullPointerException
E/AndroidRuntime(1607): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2121)
E/AndroidRuntime(1607): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
E/AndroidRuntime(1607): at android.app.ActivityThread.access$800(ActivityThread.java:135)
E/AndroidRuntime(1607): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
E/AndroidRuntime(1607): at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime(1607): at android.os.Looper.loop(Looper.java:136)
E/AndroidRuntime(1607): at android.app.ActivityThread.main(ActivityThread.java:5017)
E/AndroidRuntime(1607): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(1607): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(1607): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
E/AndroidRuntime(1607): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
E/AndroidRuntime(1607): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(1607): Caused by: java.lang.NullPointerException
E/AndroidRuntime(1607): at android.app.Activity.findViewById(Activity.java:1884)
E/AndroidRuntime(1607): at com.example.lifeahead.MainActivity.<init>(MainActivity.java:22)
E/AndroidRuntime(1607): at java.lang.class.newInstanceImpl(Native Method)
E/AndroidRuntime(1607): at java.lang.class.newInstance(Class.java:1208)
E/AndroidRuntime(1607): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
E/AndroidRuntime(1607): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2112)
E/AndroidRuntime(1607): ... 11 more
我感谢所有帮助！
解决方法:
stacktrace告诉你
Button logIn = (Button) findViewById(R.id.login);
findViewById返回的对象为null,因为您拥有的唯一方法是logIn(). findViewById返回null的唯一原因是因为您正在查找不属于当前活动的视图层次结构的视图
android – Gson中的RuntimeException解析JSON：无法调用受保护的java.lang.ClassLoader()而没有args
我继承了一些代码,使用Gson将我们的应用程序状态保存为
JSON,然后使用
fromJson读取它.
Gson gson = createGson(); gson.fromJson(objString,myClass);
其中一个保存的字段是Location.不幸的是,很有可能解析保存的数据失败,因为我保存的Location在其mExtras中包含一个mClassLoader,而Gson库无法使用此错误创建ClassLoader：
RuntimeException: Failed to invoke protected java.lang.classLoader() with no args
有谁知道为什么ClassLoader被包含在我的Location的附加内容中,以及它是否应该以JSON表示结尾？
我假设我可以通过单独保存位置对象中的关键字段(例如经度,纬度,高度,时间,精度)来解决这个问题,但如果可能的话,保存位置对象会很好.
我看到有一个ExclusionStrategy对象可用于排除字段,但我不确定是否可以/应该使用它来排除我位置内的额外内容…
仅供参考,这是我的Location对象的JSON数据(经度和纬度改为隐藏我)：
{
<snip>
"lastKNownLocation": {
"mResults": [
0,0
],"mProvider": "gps","mExtras": {
"mParcelledData": {
"mOwnObject": 1,"mObject": 5525040
},"mClassLoader": {
"packages": {}
},"mMap": {},"mHasFds": false,"mFdsKNown": true,"mAllowFds": true
},"mdistance": 0,"mTime": 1354658984849,"mAltitude": 5.199999809265137,"mLongitude": -122.4376,"mLon2": 0,"mLon1": 0,"mLatitude": 37.7577,"mLat1": 0,"mLat2": 0,"mInitialbearing": 0,"mHasspeed": true,"mHasbearing": false,"mHasAltitude": true,"mHasAccuracy": true,"mAccuracy": 16,"mSpeed": 0,"mbearing": 0
},<snip>
}
下面是代码未崩溃时mExtras包含的示例：
"mExtras": {
"mParcelledData": {
"mOwnsNativeParcelObject": true,"mNativePtr": 1544474480
},"mAllowFds": true
}
解决方法
问题是你试图直接将系统提供的类(Location)转换为JSON.而且,正如您所看到的,在序列化内部状态/ Java特定事物时会遇到问题. JSON是一种传递信息的半通用方式.
你不能轻易使用@Expose注释,因为它不是你的类;这将需要修改Location的源代码或通过使用jassist在运行时添加它们的相当广泛的过程(参见：http://ayoubelabbassi.blogspot.com/2011/01/how-to-add-annotations-at-runtime-to.html)
查看Location类,我只需创建一个自定义Gson Serializer和Deserializer并完成它.你真正感兴趣的是GPS数据,而不是类本身的内部.您只需使用getter构建包含序列化程序中所需信息的JSON,然后在Deserializer中创建一个新的Location实例,并使用公共setter从提供的JSON中填充信息.
class LocationSerializer implements JsonSerializer<Location>
{
public JsonElement serialize(Location t,Type type,JsonSerializationContext jsc)
{
JsonObject jo = new JsonObject();
jo.addProperty("mProvider",t.getProvider());
jo.addProperty("mAccuracy",t.getAccuracy());
// etc for all the publicly available getters
// for the information you're interested in
// ...
return jo;
}
}
class LocationDeserializer implements JsonDeserializer<Location>
{
public Location deserialize(JsonElement je,JsonDeserializationContext jdc)
throws JsonParseException
{
JsonObject jo = je.getAsJsonObject();
Location l = new Location(jo.getAsJsonPrimitive("mProvider").getAsstring());
l.setAccuracy(jo.getAsJsonPrimitive("mAccuracy").getAsFloat());
// etc,getting and setting all the data
return l;
}
}
现在在您的代码中使用GsonBuilder并注册类：
... GsonBuilder gsonBuilder = new GsonBuilder(); gsonBuilder.registerTypeAdapter(Location.class,new LocationDeserializer()); gsonBuilder.registerTypeAdapter(Location.class,new LocationSerializer()); Gson gson = gsonBuilder.create(); ...
这应该照顾它.
android – java.lang.RuntimeException无法实例化服务：java.lang.NullPointerException
我试图创建一个启动服务的活动(在新线程中).它包含一个带有两个editText和一个名为Send的按钮的布局.关键是当我执行MainActivity时,它会抛出：
06-15 22:32:13.312: E/AndroidRuntime(643): FATAL EXCEPTION: main 06-15 22:32:13.312: E/AndroidRuntime(643): java.lang.RuntimeException: Unable to instantiate service hikoki.services.NotificationsService: java.lang.NullPointerException 06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2237) 06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread.access$1600(ActivityThread.java:123) 06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201) 06-15 22:32:13.312: E/AndroidRuntime(643): at android.os.Handler.dispatchMessage(Handler.java:99) 06-15 22:32:13.312: E/AndroidRuntime(643): at android.os.Looper.loop(Looper.java:137) 06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread.main(ActivityThread.java:4424) 06-15 22:32:13.312: E/AndroidRuntime(643): at java.lang.reflect.Method.invokeNative(Native Method) 06-15 22:32:13.312: E/AndroidRuntime(643): at java.lang.reflect.Method.invoke(Method.java:511) 06-15 22:32:13.312: E/AndroidRuntime(643): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 06-15 22:32:13.312: E/AndroidRuntime(643): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 06-15 22:32:13.312: E/AndroidRuntime(643): at dalvik.system.NativeStart.main(Native Method) 06-15 22:32:13.312: E/AndroidRuntime(643): Caused by: java.lang.NullPointerException 06-15 22:32:13.312: E/AndroidRuntime(643): at android.content.Contextwrapper.getSystemService(Contextwrapper.java:386) 06-15 22:32:13.312: E/AndroidRuntime(643): at hikoki.services.NotificationsService.<init>(NotificationsService.java:35) 06-15 22:32:13.312: E/AndroidRuntime(643): at java.lang.class.newInstanceImpl(Native Method) 06-15 22:32:13.312: E/AndroidRuntime(643): at java.lang.class.newInstance(Class.java:1319) 06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2234) 06-15 22:32:13.312: E/AndroidRuntime(643): ... 10 more
主要活动的代码是这样的：
public class MainActivity extends Activity {
private String TAG = getClass().getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Thread t= new Thread(){
public void run(){
Intent intent=new Intent(getContext(),NotificationsService.class);
//Intent intent=new Intent("hikoki.services.NotificationsService");
Log.d(TAG,"sending notificationsService");
startService(intent);
}
};
t.start();
}
protected Context getContext() {
return this;
}
}
NotificationsService代码在这里：
public class NotificationsService extends IntentService{
private static int TIME_INTERVAL_MILIS=5000;
private static final int REFRESH=10;
private notificationmanager noteManager;
private static List<FlightStatusNote> flights= new ArrayList<FlightStatusNote>();
public NotificationsService(){
super("NotificationsService");
noteManager= notificationmanager)getSystemService(Context.NOTIFICATION_SERVICE)
}
}
AndroidManifest是这样的：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="hikoki.services"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="hikoki.services.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>
<service android:name=".FlightStatusService"></service>
<service android:enabled="true" android:name=".NotificationsService"></service>
</application>
</manifest>
解决方法
您不能从初始化程序(如您原来的那样)或构造函数(就像您现在一样)调用getSystemService().请覆盖onCreate(),并在那里调用getSystemService().
基本上,直到调用onCreate()(或者更准确地说,直到你从onCreate()调用super.onCreate()之后),服务上的继承方法还没有准备好供您使用.
我们今天的关于android – java.lang.RuntimeException：无法在未调用Looper.prepare()的线程内创建处理程序的分享就到这里，谢谢您的阅读，如果想了解更多关于Android FATAL EXCEPTION MAIN：java.lang.RuntimeException：无法启动活动ComponentInfo、Android java.lang.RuntimeException：无法实例化活动ComponentInfo … java.lang.NullPointerException、android – Gson中的RuntimeException解析JSON：无法调用受保护的java.lang.ClassLoader()而没有args、android – java.lang.RuntimeException无法实例化服务：java.lang.NullPointerException的相关信息，可以在本站进行搜索。
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