我一直在努力了解Google云端消息传递如何在Android应用中运行，特别是多播消息传递，因此我找到了一个包含源代码的教程。不幸的是，我可以让程序无错误地编译，但是当它运行时，我会得到致命的异常。谁知道出了什么问题？
以下是主要活动：
package com.ganyo.pushtest;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gcm.GCMRegistrar;
import static com.ganyo.pushtest.Util.*;
import static com.ganyo.pushtest.Util.TAG;
public class PushMainActivity extends Activity {
private TextView messageTextView;
private Button sendButton;
private AlertDialogManager alert = new AlertDialogManager();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// this is a hack to force AsyncTask to be initialized on main thread. Without this things
// won't work correctly on older versions of Android (2.2, apilevel=8)
try {
Class.forName("android.os.AsyncTask");
} catch (Exception ignored) {}
GCMRegistrar.checkDevice(this);
GCMRegistrar.checkManifest(this);
initUI();
AppServices.loginAndRegisterForPush(this);
}
private void initUI() {
setContentView(R.layout.main);
messageTextView = (TextView)findViewById(R.id.lblMessage);
sendButton = (Button)findViewById(R.id.sendButton);
sendButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
AppServices.sendMyselfANotification(v.getContext());
}
});
registerReceiver(notificationReceiver, new IntentFilter(DISPLAY_MESSAGE_ACTION));
}
/**
* Receives push Notifications
* */
private final BroadcastReceiver notificationReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// Waking up mobile if it is sleeping
WakeLocker.acquire(getApplicationContext());
/**
* Take some action upon receiving a push notification here!
**/
String message = intent.getExtras().getString(EXTRA_MESSAGE);
if (message == null) { message = "Empty Message"; }
Log.i(TAG, message);
messageTextView.append("\n" + message);
alert.showAlertDialog(context, getString(R.string.gcm_alert_title), message);
Toast.makeText(getApplicationContext(), getString(R.string.gcm_message, message), Toast.LENGTH_LONG).show();
WakeLocker.release();
}
};
// this will be called when the screen rotates instead of onCreate()
// due to manifest setting, see: android:configChanges
@Override
public void onConfigurationChanged(Configuration newConfig)
{
super.onConfigurationChanged(newConfig);
initUI();
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(notificationReceiver);
}
}
这是清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ganyo.pushtest"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16"/>
<permission android:name="com.ganyo.pushtest.permission.C2D_MESSAGE" android:protectionLevel="signature" />
<uses-permission android:name="com.ganyo.pushtest.permission.C2D_MESSAGE" />
<!-- App receives GCM messages. -->
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<!-- GCM connects to Google Services. -->
<uses-permission android:name="android.permission.INTERNET" />
<!-- GCM requires a Google account. -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<!-- Keeps the processor from sleeping when a message is received. -->
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<application android:label="@string/app_name" android:icon="@drawable/ic_launcher">
<activity android:name="com.ganyo.pushtest.PushMainActivity"
android:label="@string/app_name"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<receiver android:name="com.google.android.gcm.GCMBroadcastReceiver"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<action android:name="com.google.android.c2dm.intent.REGISTRATION" />
<category android:name="com.ganyo.pushtest" />
</intent-filter>
</receiver>
<service android:name="GCMIntentService" />
</application>
</manifest>
这是Appservices：
package com.ganyo.pushtest;
import android.content.Context;
import android.util.Log;
import com.apigee.sdk.ApigeeClient;
import com.apigee.sdk.data.client.DataClient;
import com.apigee.sdk.data.client.callbacks.ApiResponseCallback;
import com.apigee.sdk.data.client.callbacks.DeviceRegistrationCallback;
import com.apigee.sdk.data.client.entities.Device;
import com.apigee.sdk.data.client.entities.Entity;
import com.apigee.sdk.data.client.response.ApiResponse;
import com.apigee.sdk.data.client.utils.JsonUtils;
import com.google.android.gcm.GCMRegistrar;
import com.apigee.sdk.data.client.push.GCMPayload;
import com.apigee.sdk.data.client.push.GCMDestination;
import java.util.HashMap;
import static com.ganyo.pushtest.Util.*;
import static com.ganyo.pushtest.Settings.*;
public final class AppServices {
private static DataClient client;
private static Device device;
static synchronized DataClient getClient(Context context) {
if (client == null) {
if (ORG.equals("<<your org name here>>")) {
Log.e(TAG, "ORG value has not been set.");
} else {
ApigeeClient apigeeClient = new ApigeeClient(ORG,APP,API_URL,context);
client = apigeeClient.getDataClient();
}
}
return client;
}
static void loginAndRegisterForPush(final Context context) {
if ((USER != null) && (USER.length() > 0)) {
DataClient dataClient = getClient(context);
if (dataClient != null) {
dataClient.authorizeAppUserAsync(USER, PASSWORD, new ApiResponseCallback() {
@Override
public void onResponse(ApiResponse apiResponse) {
Log.i(TAG, "login response: " + apiResponse);
registerPush(context);
}
@Override
public void onException(Exception e) {
displayMessage(context, "Login Exception: " + e);
Log.i(TAG, "login exception: " + e);
}
});
} else {
Log.e(TAG,"Data client is null, did you set ORG value in Settings.java?");
}
} else {
registerPush(context);
}
}
static void registerPush(Context context) {
final String regId = GCMRegistrar.getRegistrationId(context);
if ("".equals(regId)) {
GCMRegistrar.register(context, Settings.GCM_SENDER_ID);
} else {
if (GCMRegistrar.isRegisteredOnServer(context)) {
Log.i(TAG, "Already registered with GCM");
} else {
AppServices.register(context, regId);
}
}
}
/**
* Register this user/device pair on App Services.
*/
static void register(final Context context, final String regId) {
Log.i(TAG, "registering device: " + regId);
DataClient dataClient = getClient(context);
if (dataClient != null) {
dataClient.registerDeviceForPushAsync(dataClient.getUniqueDeviceID(), NOTIFIER, regId, null, new DeviceRegistrationCallback() {
@Override
public void onResponse(Device device) {
Log.i(TAG, "register response: " + device);
AppServices.device = device;
displayMessage(context, "Device registered as: " + regId);
DataClient dataClient = getClient(context);
if (dataClient != null) {
// connect Device to current User - if there is one
if (dataClient.getLoggedInUser() != null) {
dataClient.connectEntitiesAsync("users", dataClient.getLoggedInUser().getUuid().toString(),
"devices", device.getUuid().toString(),
new ApiResponseCallback() {
@Override
public void onResponse(ApiResponse apiResponse) {
Log.i(TAG, "connect response: " + apiResponse);
}
@Override
public void onException(Exception e) {
displayMessage(context, "Connect Exception: " + e);
Log.i(TAG, "connect exception: " + e);
}
});
}
} else {
Log.e(TAG,"data client is null, did you set ORG value in Settings.java?");
}
}
@Override
public void onException(Exception e) {
displayMessage(context, "Register Exception: " + e);
Log.i(TAG, "register exception: " + e);
}
@Override
public void onDeviceRegistration(Device device) { /* this won't ever be called */ }
});
} else {
Log.e(TAG, "Data client is null, did you set ORG value in Settings.java?");
}
}
static void sendMyselfANotification(final Context context) {
if (device == null) {
displayMessage(context, "Device not registered. ORG value set in Settings.java?");
} else {
DataClient dataClient = getClient(context);
if (dataClient != null) {
GCMDestination destination = GCMDestination.destinationSingleDevice(device.getUuid());
GCMPayload payload = new GCMPayload();
payload.setAlertText("Hi there!");
dataClient.pushNotificationAsync(payload, destination, "google", new ApiResponseCallback() {
@Override
public void onResponse(ApiResponse apiResponse) {
Log.i(TAG, "send response: " + apiResponse);
}
@Override
public void onException(Exception e) {
displayMessage(context, "Send Exception: " + e);
Log.i(TAG, "send exception: " + e);
}
});
} else {
Log.e(TAG, "data client is null, did you set ORG value in Settings.java?");
}
}
}
/**
* Unregister this device within the server.
*/
static void unregister(final Context context, final String regId) {
Log.i(TAG, "unregistering device: " + regId);
register(context, "");
}
}
Gmcintentservices：
package com.ganyo.pushtest;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.NotificationCompat.Builder;
import com.google.android.gcm.GCMBaseIntentService;
import static com.ganyo.pushtest.Settings.GCM_SENDER_ID;
import static com.ganyo.pushtest.Util.displayMessage;
public class GCMIntentService extends GCMBaseIntentService {
public GCMIntentService() {
super(GCM_SENDER_ID);
}
/**
* Method called on device registered
**/
@Override
protected void onRegistered(Context context, String registrationId) {
Log.i(TAG, "Device registered: " + registrationId);
displayMessage(context, getString(R.string.gcm_registered, registrationId));
AppServices.register(context, registrationId);
}
/**
* Method called on device unregistered
* */
@Override
protected void onUnregistered(Context context, String registrationId) {
Log.i(TAG, "Device unregistered");
displayMessage(context, getString(R.string.gcm_unregistered, registrationId));
AppServices.unregister(context, registrationId);
}
/**
* Method called on receiving a new message
* */
@Override
protected void onMessage(Context context, Intent intent) {
String message = intent.getExtras().getString("data");
Log.i(TAG, "Received message: " + message);
displayMessage(context, message);
generateNotification(context, message);
}
/**
* Method called on receiving a deleted message
* */
@Override
protected void onDeletedMessages(Context context, int total) {
Log.i(TAG, "Received deleted messages notification");
String message = getString(R.string.gcm_deleted, total);
displayMessage(context, message);
generateNotification(context, message);
}
/**
* Method called on Error
* */
@Override
public void onError(Context context, String errorId) {
Log.i(TAG, "Received error: " + errorId);
displayMessage(context, getString(R.string.gcm_error, errorId));
}
@Override
protected boolean onRecoverableError(Context context, String errorId) {
Log.i(TAG, "Received recoverable error: " + errorId);
displayMessage(context, getString(R.string.gcm_recoverable_error, errorId));
return super.onRecoverableError(context, errorId);
}
/**
* Issues a Notification to inform the user that server has sent a message.
*/
private static void generateNotification(Context context, String message) {
int icon = R.drawable.ic_launcher;
long when = System.currentTimeMillis();
NotificationManager notificationManager = (NotificationManager)
context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent notificationIntent = new Intent(context, PushMainActivity.class);
// set intent so it does not start a new activity
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent intent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
Notification notification = new NotificationCompat.Builder(context)
.setContentText(message)
.setContentTitle(context.getString(R.string.app_name))
.setSmallIcon(icon)
.setWhen(when)
.setContentIntent(intent)
.build();
notification.flags |= Notification.FLAG_AUTO_CANCEL;
// Play default notification sound
notification.defaults |= Notification.DEFAULT_SOUND;
// Vibrate if vibrate is enabled
notification.defaults |= Notification.DEFAULT_VIBRATE;
notificationManager.notify(0, notification);
}
}
Alertdialoguemanager:
package com.ganyo.pushtest;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
public class AlertDialogManager {
public void showAlertDialog(Context context, String title, String message) {
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle(title);
alertDialog.setMessage(message);
alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.show();
}
}
的Util：
package com.ganyo.pushtest;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import com.google.android.gcm.GCMRegistrar;
public final class Util {
static final String TAG = "com.ganyo.pushtest";
static final String DISPLAY_MESSAGE_ACTION = "com.ganyo.pushtest.DISPLAY_MESSAGE";
static final String EXTRA_MESSAGE = "message";
static void displayMessage(Context context, String message) {
Intent intent = new Intent(DISPLAY_MESSAGE_ACTION);
intent.putExtra(EXTRA_MESSAGE, message);
context.sendBroadcast(intent);
}
}
Wakelocker：
package com.ganyo.pushtest;
import android.content.Context;
import android.os.PowerManager;
public abstract class WakeLocker {
private static PowerManager.WakeLock wakeLock;
public static void acquire(Context context) {
if (wakeLock != null) wakeLock.release();
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.ON_AFTER_RELEASE |
PowerManager.ACQUIRE_CAUSES_WAKEUP |
PowerManager.ON_AFTER_RELEASE |
PowerManager.SCREEN_DIM_WAKE_LOCK, "WakeLock");
wakeLock.acquire();
}
public static void release() {
if (wakeLock != null) wakeLock.release(); wakeLock = null;
}
}
这是致命异常的logcat区域：
05-01 00:26:52.757: D/AndroidRuntime(166): Shutting down VM
05-01 00:26:52.777: D/jdwp(166): adbd disconnected
05-01 00:26:52.817: I/AndroidRuntime(166): NOTE: attach of thread 'Binder Thread #3' failed
05-01 00:26:53.050: I/ActivityThread(258): Publishing provider com.svox.pico.providers.SettingsProvider: com.svox.pico.providers.SettingsProvider
05-01 00:26:53.627: I/ActivityManager(58): Start proc com.ganyo.pushtest for activity com.ganyo.pushtest/.PushMainActivity: pid=267 uid=10036 gids={3003}
05-01 00:26:54.687: W/WindowManager(58): No window to dispatch pointer action 0
05-01 00:26:54.707: W/WindowManager(58): No window to dispatch pointer action 1
05-01 00:26:55.467: D/AndroidRuntime(267): Shutting down VM
05-01 00:26:55.467: W/dalvikvm(267): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-01 00:26:55.537: E/AndroidRuntime(267): FATAL EXCEPTION: main
05-01 00:26:55.537: E/AndroidRuntime(267): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ganyo.pushtest/com.ganyo.pushtest.PushMainActivity}: java.lang.ClassNotFoundException: com.ganyo.pushtest.PushMainActivity in loader dalvik.system.PathClassLoader[/data/app/com.ganyo.pushtest-2.apk]
05-01 00:26:55.537: E/AndroidRuntime(267): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
05-01 00:26:55.537: E/AndroidRuntime(267): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-01 00:26:55.537: E/AndroidRuntime(267): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-01 00:26:55.537: E/AndroidRuntime(267): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-01 00:26:55.537: E/AndroidRuntime(267): at android.os.Handler.dispatchMessage(Handler.java:99)
05-01 00:26:55.537: E/AndroidRuntime(267): at android.os.Looper.loop(Looper.java:123)
05-01 00:26:55.537: E/AndroidRuntime(267): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-01 00:26:55.537: E/AndroidRuntime(267): at java.lang.reflect.Method.invokeNative(Native Method)
05-01 00:26:55.537: E/AndroidRuntime(267): at java.lang.reflect.Method.invoke(Method.java:521)
05-01 00:26:55.537: E/AndroidRuntime(267): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-01 00:26:55.537: E/AndroidRuntime(267): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-01 00:26:55.537: E/AndroidRuntime(267): at dalvik.system.NativeStart.main(Native Method)
05-01 00:26:55.537: E/AndroidRuntime(267): Caused by: java.lang.ClassNotFoundException: com.ganyo.pushtest.PushMainActivity in loader dalvik.system.PathClassLoader[/data/app/com.ganyo.pushtest-2.apk]
05-01 00:26:55.537: E/AndroidRuntime(267): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
05-01 00:26:55.537: E/AndroidRuntime(267): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
05-01 00:26:55.537: E/AndroidRuntime(267): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
05-01 00:26:55.537: E/AndroidRuntime(267): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
05-01 00:26:55.537: E/AndroidRuntime(267): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
05-01 00:26:55.537: E/AndroidRuntime(267): ... 11 more
05-01 00:26:55.617: W/ActivityManager(58): Force finishing activity com.ganyo.pushtest/.PushMainActivity
05-01 00:26:56.499: W/ActivityManager(58): Activity pause timeout for HistoryRecord{460133f8 com.ganyo.pushtest/.PushMainActivity}
05-01 00:26:56.687: I/ARMAssembler(58): generated scanline__00000077:03515104_00000000_00000000 [ 33 ipp] (47 ins) at [0x3261a0:0x32625c] in 1336038 ns
05-01 00:26:56.777: I/ARMAssembler(58): generated scanline__00000177:03515104_00001001_00000000 [ 91 ipp] (114 ins) at [0x3265b8:0x326780] in 1506105 ns
05-01 00:26:57.337: I/ARMAssembler(58): generated scanline__00000077:03545404_00000004_00000000 [ 47 ipp] (67 ins) at [0x326788:0x326894] in 951792 ns
05-01 00:26:57.967: D/AndroidRuntime(271): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<
05-01 00:26:58.009: D/AndroidRuntime(271): CheckJNI is ON
05-01 00:27:00.377: D/AndroidRuntime(271): --- registering native functions ---
感谢您的帮助！
答案 0 :(得分：0)
原来是java文件夹中的所有.java文件。一旦我在src路径中重新编写它们，程序就能正常工作。