我已在我的WebviewActivity中实施了一个警报管理器，该警报管理器应该在仪表板Service中每15分钟调用Fragment。当我尝试运行应用程序时，我收到以下Logcat错误。
logcat的
09-15 04:34:35.250 21867-21867/com.example.s210121629.myhealth E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.s210121629.myhealth, PID: 21867
java.lang.RuntimeException: Unable to instantiate service com.example.s210121629.myhealth.dashboard.DashboardActivity$MyService: java.lang.InstantiationException: can't instantiate class com.example.s210121629.myhealth.dashboard.DashboardActivity$MyService; no empty constructor
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2786)
at android.app.ActivityThread.access$1900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1384)
at android.os.Handler.dispatchMessage(Handler.java:102)
WebviewActivity
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.oauth_activity);
ButterKnife.inject(this);
pref = getSharedPreferences("AppPref", MODE_PRIVATE);
myself = this;
//TODO: Alarmmanager
_oauth_signin = (Button) findViewById(R.id.oauth_signin);
_refresh = (Button) findViewById(R.id.refresh);
BASE64Encoder encoder = new BASE64Encoder();
concatinate = CLIENT_ID + ":" + CLIENT_SECRET;
concate = encoder.encode(concatinate.getBytes());
mdbhelper = new DBHelper(getApplicationContext());
_oauth_signin.setOnClickListener(new View.OnClickListener() {
Dialog auth_dialog;
@Override
public void onClick(View v) {
//TODO : Pop-up dialog to be displayed with Oauth2.0
auth_dialog = new Dialog(WebViewActivity.this);
auth_dialog.setContentView(R.layout.webview);
_webview = (WebView) auth_dialog.findViewById(R.id.webView);
_webview.getSettings().setJavaScriptEnabled(true);
_webview.loadUrl(OAUTH_URL + "?response_type=" + RESPONSE_TYPE + "&client_id=" + CLIENT_ID + "&redirect_uri=" + REDIRECT_URI + "&scope=" + SCOPE + "&expires_in=" + EXPIRES_IN);
_webview.setWebViewClient(new WebViewClient() {
boolean authComplete = false;
Intent resultIntent = new Intent();
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if (url.contains("?code=") && authComplete != true) {
Uri uri = Uri.parse(url);
authCode = uri.getQueryParameter("code");
Log.i("", "CODE : " + authCode);
authComplete = true;
resultIntent.putExtra("code", authCode);
WebViewActivity.this.setResult(Activity.RESULT_OK, resultIntent);
setResult(Activity.RESULT_CANCELED, resultIntent);
SharedPreferences.Editor edit = pref.edit();
edit.putString("Code", authCode);
edit.commit();
auth_dialog.dismiss();
new TokenGet().execute();
Toast.makeText(getApplicationContext(), "Authorization Code is: " + authCode, Toast.LENGTH_SHORT).show();
// new RequestAccess().execute();
} else if (url.contains("error=access_denied")) {
Log.i("", "ACCESS_DENIED_HERE");
resultIntent.putExtra("code", authCode);
authComplete = true;
setResult(Activity.RESULT_CANCELED, resultIntent);
Toast.makeText(getApplicationContext(), "Error Occurred", Toast.LENGTH_SHORT).show();
auth_dialog.dismiss();
}
}
});
auth_dialog.setTitle("Authorize myHealth");
auth_dialog.setCancelable(true);
auth_dialog.show();
}
});
AlarmManager alarmManager = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, DashboardActivity.MyService.class);
// intent.setAction(MyReceiver.ACTION_ALARM_RECEIVER);//my custom string action name
PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, 0);//used unique ID as 1001
long start = System.currentTimeMillis() + TimeUnit.MINUTES.toMinutes(2);
long next = TimeUnit.MINUTES.toMinutes(5);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, start, AlarmManager.INTERVAL_FIFTEEN_MINUTES, pendingIntent);//first start will start
DashboardFragment
public class **MyService** extends Service{
public MyService() {
super();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
new refresh().execute();
}
@Override
public void onDestroy() {
super.onDestroy();
}
}
private class refresh extends AsyncTask<String, String, JSONObject> {
@Override
protected JSONObject doInBackground(String... params) {
RefreshToken jParser = new RefreshToken();
JSONObject json = jParser.refreshToken(TOKEN_URL, concate + "=", GRANT_TYPE_REFRESH_TOKEN, refreshToken);
return json;
}
@Override
protected void onPostExecute(JSONObject jsonObject) {
if (jsonObject != null) {
try {
newAccess = jsonObject.getString("access_token");
newRefresh = jsonObject.getString("refresh_token");
Log.d("Refresh", newRefresh);
mdbhelper.updateToken(newAccess, newRefresh, concate);
Toast.makeText(getActivity(), "Token Updated", Toast.LENGTH_SHORT).show();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
Toast.makeText(getActivity(), "Network Error", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
}
清单
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.wake_lock" />
<service
android:name=".dashboard.DashboardActivity$MyService"
android:enabled="true"></service>
MyService类是DashboardActivity中的内部类，因为我希望能够访问DashboardFragment中的网络调用方法。 Myservice类内部有一个构造函数。如果我使Myservice静态，我将无法访问外部类的任何方法。
答案 0 :(得分：0)
你的代码有点混乱。
因此，请尝试将 DashboardFragment 重命名为 Myservice ，并生成如下意图：
Intent intent = new Intent(this, MyService.class);
另外，将您的清单文件更改为
<service
android:name="Your service pacakge + "." + MyService"
android:enabled="true">
</service>
例如，如果您的服务包是com.android.system。那么你的android名称应该是＆＃34;
com.android.system.MyService
答案 1 :(得分：0)
如果你想把你的服务变成一个内部类。服务必须是一个静态类。就像那样：
public static class MyService extends Service {
public MyService() {
super();
}}