我建立了两个项目：一个是Remote Service Pro，另一个是测试Remote Service Pro。
package com.example.alpha.receiverserrvice.Services;
// Declare any non-default types here with import statements
interface Pay {
/**
* Demonstrates some basic types that you can use as parameters
* and return values in AIDL.
*/
int pay(String username,String password,float money);
}
远程服务在清单中注册：
<service android:name=".Services.PayService"
android:exported="true">
<intent-filter>
<action android:name="com.example.alpha.alipay"/>
</intent-filter>
远程服务代码如下：
public class PayService extends Service {
private Mybinder mybinder;
@Nullable
@Override
public IBinder onBind(Intent intent) {
mybinder=new Mybinder();
return mybinder;
}
@Override
public void onCreate() {
super.onCreate();
}
private class Mybinder extends Pay.Stub{
@Override
public int pay(String username, String password, float money) throws RemoteException {
return safePay(username,password,money);
}
}
private int safePay(String username,String password,float money){
if("gyq".equals(username)&&"123456".equals(password)){
if(money>100){
return 200;
}
else return 500;
}
else return 404;
}
}
并在另一个项目中测试远程服务代码如下：
public class MainActivity extends AppCompatActivity {
private Myconn conn;
private Pay payment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent=new Intent("com.example.alpha.alipay");
intent.setPackage("com.example.alpha.receiverserrvice.Services");
conn=new Myconn();
bindService(intent, conn, Context.BIND_AUTO_CREATE);
Button button= (Button) findViewById(R.id.pay);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Payfor(view);
}
});
}
public void Payfor(View view) {
try {
int resultcode= payment.pay("gyq123", "123456", 300.0f);
if (200==resultcode) {
Toast.makeText(this, "pay success.", Toast.LENGTH_SHORT).show();
}
else if (resultcode==404) {
Toast.makeText(this, "username or password is incorrect", Toast.LENGTH_SHORT).show();
}
else if (resultcode==500) {
Toast.makeText(this, "Lack of balance", Toast.LENGTH_SHORT).show();
}
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private class Myconn implements ServiceConnection{
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
payment=Pay.Stub.asInterface(service);
Log.d("zhifubao.client", "bind remote servoce success.");
}
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
}
}
最后，android studio中的错误如下：
java.lang.NullPointerException: Attempt to invoke interface method 'int com.example.alpha.receiverserrvice.Services.Pay.pay(java.lang.String, java.lang.String, float)' on a null object reference
at com.example.alpha.testpayservice.MainActivity$override.Payfor(MainActivity.java:47)
at com.example.alpha.testpayservice.MainActivity$override.access$dispatch(MainActivity.java)
at com.example.alpha.testpayservice.MainActivity.Payfor(MainActivity.java:0)
at com.example.alpha.testpayservice.MainActivity$1$override.onClick(MainActivity.java:40)
at com.example.alpha.testpayservice.MainActivity$1$override.access$dispatch(MainActivity.java)
at com.example.alpha.testpayservice.MainActivity$1.onClick(MainActivity.java:0)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
因此，当我尝试将远程服务绑定到调用方法时，它总是向我返回空对象引用，我不知道问题出在哪里，如果可以找到它，请告诉。谢谢。
最佳答案
您的包裹名称错误，应该是：
intent.setPackage("com.example.alpha.receiverserrvice");