获取java.lang.ClassCastException：android.os.BinderProxy每次申报并运行两个服务 [英] Getting java.lang.ClassCastException: android.os.BinderProxy every time i declare and run two services
问题描述
我遇到我每次申报并运行两个服务如下binder.proxy例外。一个服务于不同的进程（专用于应用程序）运行和其他服务运行在同一进程中我的应用程序中（默认应用程序）与粘合剂实施运行。
I am encountering following binder.proxy exception every time i declare and run two services. One service runs in different Process(Private to app) and another service runs in same process as My Application is running in(Default App Process) with a Binder Implementation.
的AndroidManifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.service.check"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:name="com.service.check.MainApplication"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".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="com.service.check.SecondService"
android:exported="false"/>
<service
android:name="com.service.check.FirstService"
android:process=":newProcess" >
</service>
</application>
</manifest>
我的按钮点击启动在MainActivity我的第一个服务为：
I am launching my first service in MainActivity on Button click as:
MainActivity.java
public class MainActivity extends ActionBarActivity implements OnClickListener {
private Button mLanchServiceBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mLanchServiceBtn=(Button) findViewById(R.id.launch_btn);
mLanchServiceBtn.setOnClickListener(this);
}
@Override
public void onClick(View v) {
//Starting first service
Intent launch=new Intent(this,FirstService.class);
startService(launch);
}
}
和第二服务MainApplication类。
And second service in MainApplication class as.
MainApplication.java
public class MainApplication extends Application {
private SecondService.LocalBinder mBinder;
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className, IBinder service) {
mBinder = (LocalBinder) service;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
}
};
@Override
public void onCreate() {
super.onCreate();
//starting second service
Intent launch=new Intent(this,SecondService.class);
startService(launch);
//Binding to it
bindService(launch, mConnection, BIND_AUTO_CREATE);
}
}
FirstService.java
public class FirstService extends Service {
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
SecondService.java
public class SecondService extends Service{
//Service Containing Local Binder
private LocalBinder mBinder=new LocalBinder();
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
class LocalBinder extends Binder{
public LocalBinder() {
}
}
}
堆栈跟踪：
02-05 10:32:25.035: E/AndroidRuntime(1424): Process:
com.service.check:newProcess, PID: 1424 02-05 10:32:25.035:
E/AndroidRuntime(1424): java.lang.ClassCastException:
android.os.BinderProxy cannot be cast to
com.service.check.SecondService$LocalBinder 02-05 10:32:25.035:
E/AndroidRuntime(1424): at
com.service.check.MainApplication$1.onServiceConnected(MainApplication.java:23)
02-05 10:32:25.035: E/AndroidRuntime(1424): at
android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1101)
我已经提到了以下链接进行梳理它说的问题， 如果我的活动和服务都在单独的进程那么我们不应该结合我做的方式。
I have referred the following links to sort out the issue which says, if my activity and service are in separate processes then we should not bind the way I have done.
<一个href="http://stackoverflow.com/questions/10573931/android-service-android-os-binderproxy-error">Android服务android.os.BinderProxy错误
<一个href="http://stackoverflow.com/questions/25049176/java-lang-classcastexception-android-os-binderproxy-cannot-be-cast-to-localbind">java.lang.ClassCastException: android.os.BinderProxy不能转换为LocalBinder
但是，在我的情况： 我结合 SecondService 从 MainApplication 无一不是在同一个进程（即默认应用程序）运行。不过，我在面对binderProxy异常 SecondService ，然后我的 FirstService 运行中，我甚至不绑定独立的过程。
But in my case: I am binding to SecondService from MainApplication and both are running in same Process(i.e Default Application Process). Still I am facing binderProxy exception in SecondService , And my FirstService runs in separate process which I am not even binding to.
请帮我了这一情况，并推荐了我一个最好的方式，这样我可以实现相同的情况下，没有任何碰撞。
Please help me out with this situation and, Suggest me a best possible way so that I can implement same scenario without any crash.
推荐答案
做一些研究和调试后找到了答案，
Found an answer after doing some research and debugging,
如果我们创建和绑定任何服务到MainApplication类（然后服务被绑定到整体的ApplicationContext或BaseContext），如果同一应用程序包含了被绑定到活动的具体语境（S），
If we create and bind any service to a MainApplication class(then service gets binded to whole ApplicationContext or BaseContext) and if same application contains other services which are binded to Activity specific Context(s),
//Declared in MainApplication
@Override
public void onServiceConnected(ComponentName className, IBinder service) {
mBinder = (LocalBinder) service;
}
在OnServiceConnected（），我们将得到的粘合剂对象既服务（ SecondService 开始在MainApplication（注册BaseContext会得到当地binderObject）类和 FirstService 开始MainActivity（将获得的 android.os.binderProxyObject从而导致ClassCastException异常）。
In OnServiceConnected() We will get binder object for both the Services( SecondService Started in MainApplication(registered with BaseContext will get local binderObject) class and FirstService started MainActivity(will get android.os.binderProxyObject hence causing ClassCastException).
-
因此，为确定这个问题人们必须启动所有应用程序 服务从任何活动上下文，而不是使用任何全球 应用程序上下文。另外这个问题的独立的 进程
So, to fix this issue one has to start all the application services from any Activity Context rather than using any Global Application Context. Also this issue is independent of the Processes
因此，我既感动和SecondService到FirstService MainActivity Context，它解决了该问题。
Hence, I moved both SecondService and FirstService into MainActivity Context which fixed the issue.
MainActivity.java
private Button mLanchServiceBtn;
private SecondService.LocalBinder mBinder;
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className, IBinder service) {
mBinder = (LocalBinder) service;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mLanchServiceBtn=(Button) findViewById(R.id.launch_btn);
mLanchServiceBtn.setOnClickListener(this);
//starting second service in activity
Intent launch=new Intent(this,SecondService.class);
startService(launch);
//Binding to it
bindService(launch, mConnection, BIND_AUTO_CREATE);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
//Starting FirstService also from MainActivity
Intent launch=new Intent(this,FirstService.class);
startService(launch);
}
}
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