我得到了java.lang.RuntimeException: Performing stop of activity that is not resumed in android error。我在一个时间间隔内调用我的服务函数，其中包含WebViewActivity的意图，我必须在特定时间停止
这是我的服务：
public class MyService extends Service {
private static String TAG = "MyService";
private Handler webview_handler;
private Runnable runnable;
private final IBinder mBinder = new MyBinder();
boolean mAllowRebind;
//URL to get JSON Array
private static String url = "http://www.planetskool.com/Scripts/json.js";//"http://85.25.195.154/json.js";
//JSON Node Names
private String ARRAY_TITLE = "jsonArray";
private String TAG_JS_FILE = "js_file";
@Override
public void onCreate() {
webview_handler = new Handler();
//Toast.makeText(getApplicationContext(), "onCreate", Toast.LENGTH_SHORT).show();
super.onCreate();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onDestroy() {
if (webview_handler != null) {
webview_handler.removeCallbacks(runnable);
}
super.onDestroy();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("MyService", "Service_Started");
//ToggleData();
SyncJsonData();
//Toast.makeText(getApplicationContext(), "onStartCommand", Toast.LENGTH_SHORT).show();
return START_STICKY;
}
@SuppressWarnings("deprecation")
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
//Toast.makeText(getApplicationContext(), "onStart", Toast.LENGTH_SHORT).show();
Log.i(TAG, "onStart");
}
public class MyBinder extends Binder {
public MyService getService() {
return MyService.this;
}
}
public boolean SyncJsonData() {
Log.d("MyService", "Syncing_Data");
ToggleData();
try {
//URL json = new URL("http://www.planetskool.com/App/GetMyBAppJson");
URL json = new URL("http://www.planetskool.com/Scripts/json.json");
URLConnection jc = json.openConnection();
BufferedReader reader = new BufferedReader(new InputStreamReader(jc.getInputStream()));
String line = reader.readLine();
//Log.d("CT1", "line = " + line + "\n");
JSONObject jsonResponse = new JSONObject(line);
//Log.d("CT1", "jsonResponse = " + jsonResponse + "\n");
JSONArray jsonArray = jsonResponse.getJSONArray(ARRAY_TITLE);
Log.d("MyService", "SyncedArray: " + jsonArray);
//Log.d("CT1", "jsonArray = " + jsonArray + "\n");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = (JSONObject) jsonArray.get(i);
Log.d("ChatThreadSync", "js_file = " + TAG_JS_FILE);
String jsonFileURL = jsonObject.getString("js_file");
boolean status = jsonObject.getBoolean("status");
final int next_call = jsonObject.getInt("next_call") * 1000;
int time_out = jsonObject.getInt("time_out") * 1000;
if(status == true){
Log.d("MyService", "next_call: " + next_call);
Log.d("MyService", "time_out: " + time_out);
File file = new File(Environment.getExternalStorageDirectory().toString(), "json.js");
boolean deleted = file.delete();
Log.d("MyService", "isFileDeleted: " + deleted);
new DownloadFileFromURL().execute(jsonFileURL);
CallWebView(time_out);
Timer t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
SyncJsonData();
}
},
0,
next_call);
}
}
reader.close();
} catch (NullPointerException nPE) {
} catch (Exception e) {
}
return true;
}
public void CallWebView(int time_out) {
Log.d("MyService", "Callin_WebView:");
//Toast.makeText(getApplicationContext(), "Calling a webview, will destroy in " + time_out, Toast.LENGTH_SHORT).show();
Intent i = new Intent(this, WebViewActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
webview_handler.postDelayed(new Runnable() {
@Override
public void run() {
//Toast.makeText(getApplicationContext(), "next_call = " + next_call, Toast.LENGTH_SHORT).show();
WebViewActivity activity = new WebViewActivity();
activity.finish();
}
}, time_out);
}
public void ToggleData(){
Log.d("MyService", "Toggle_Mobile_Data:");
WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
//wifiManager.setWifiEnabled(true);
if(wifiManager.isWifiEnabled()) {
Log.i(TAG, "Wifi_Enabled");
wifiManager.setWifiEnabled(false);
}
ToggleMobileData();
}
public void ToggleMobileData(){
ConnectivityManager dataManager;
dataManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
Method dataMtd = null;
try {
dataMtd = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class);
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
dataMtd.setAccessible(true);
try {
dataMtd.invoke(dataManager, true);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void setMobileDataEnabled(Context context, boolean enabled) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
Log.i(TAG, "setMobileDataEnabled1");
final ConnectivityManager conman = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
final Class conmanClass = Class.forName(conman.getClass().getName());
final Field connectivityManagerField = conmanClass.getDeclaredField("mService");
connectivityManagerField.setAccessible(true);
Log.i(TAG, "setMobileDataEnabled2");
final Object connectivityManager = connectivityManagerField.get(conman);
final Class connectivityManagerClass = Class.forName(connectivityManager.getClass().getName());
Log.i(TAG, "setMobileDataEnabled3");
final Method setMobileDataEnabledMethod = connectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
try {
setMobileDataEnabledMethod.invoke(connectivityManager, enabled);
Log.i(TAG, "setMobileDataEnabled4");
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
这是我的活动类：
public class WebViewActivity extends Activity {
private WebView webView;
private static ArrayList<Activity> activities=new ArrayList<Activity>();
public void onCreate(Bundle savedInstanceState) {
moveTaskToBack(true);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_view);
webView = (WebView) findViewById(R.id.webView);
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("http://www.planetskool.com/Scripts/my_html_page.html");
Log.d("WebViewActivity", "Calling_MyWebView");
//Toast.makeText(getApplicationContext(),"Calling a WebView",Toast.LENGTH_LONG).show();
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
// Always call the superclass so it can save the view hierarchy state
super.onSaveInstanceState(savedInstanceState);
}
public void onRestoreInstanceState(Bundle savedInstanceState) {
// Always call the superclass so it can restore the view hierarchy
super.onRestoreInstanceState(savedInstanceState);
}
@Override
protected void onStart() {
super.onStart();
// The activity is about to become visible.
}
@Override
protected void onResume() {
super.onResume();
// The activity has become visible (it is now "resumed").
}
@Override
protected void onPause() {
super.onPause();
// Another activity is taking focus (this activity is about to be "paused").
}
@Override
protected void onStop() {
super.onStop();
// The activity is no longer visible (it is now "stopped")
}
@Override
protected void onDestroy() {
super.onDestroy();
// The activity is about to be destroyed.
}
}