android.os.Handler#postDelayed ( )源码实例Demo

@Override
public void onCreate()
{
    super.onCreate();
    handler = new Handler();
    runnable = () ->
    {
        handler.postDelayed(runnable, 60000);
        Utilities.stageQueue.postRunnable(() ->
        {
            for (int a = 0; a < UserConfig.MAX_ACCOUNT_COUNT; a++)
            {
                LocationController.getInstance(a).update();
            }
        });
    };
    handler.postDelayed(runnable, 60000);
}
 

public void startHandler(View view) {
    if(!handlerStarted) {
        if (!isConnected()) {
            doConnect();
            Handler handler = new Handler();
            handler.postDelayed(() -> {
                handler1.post(process);
                handler.post(runnableMeta);
            }, 5000);
        } else {
            handler1.post(process);
            handler.post(runnableMeta);
        }
        startHandlerButton.setText("Stop Handler");
        handlerStarted=true;
    }
    else{
        stopHandler();
        handlerStarted=false;
    }
}
 

public PDelay(AppRunner appRunner, final int delay, final DelayCB callbackkfn) {
    mAppRunner = appRunner;
    handler = new Handler();

    mCallbackfn = callbackkfn;
    this.delay = delay;

    Runnable task = new Runnable() {
        @Override
        public void run() {
            if (mCancelJob) return;

            callbackkfn.event();
            handler.removeCallbacks(this);
        }
    };
    handler.postDelayed(task, delay);

    mAppRunner.whatIsRunning.add(this);
}
 

public void play(int start, PlayDirection direction) {
    if (mPlaying)
        return;
    mTotal = mPlayable.getTotal();
    if (mTotal <= 1) {
        return;
    }
    mPlaying = true;
    playTo(start);

    final Handler handler = new Handler(Looper.myLooper());
    mTimerTask = new Runnable() {
        @Override
        public void run() {
            if (!mPaused) {
                playNextFrame();
            }
            if (mPlaying) {
                handler.postDelayed(mTimerTask, mTimeInterval);
            }
        }
    };
    handler.postDelayed(mTimerTask, mTimeInterval);
}
 

public void sync() {
    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            updateTime();
        }
    }, 500);

    // Register a broadcast handler to use for the alarm Intent
    // Also listen for TIME_CHANGED and TIMEZONE_CHANGED events
    mSReceiver = new TimeSyncReqReceiver();
    IntentFilter filter = new IntentFilter();
    filter.addAction(TIME_SYNC_INTENT);
    filter.addAction(Intent.ACTION_TIME_CHANGED);
    filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
    mCtx.registerReceiver(mSReceiver, filter);

    // register an alarm to sync the time once a day
    Intent alarmIntent = new Intent(TIME_SYNC_INTENT);
    alarmPendingIntent = PendingIntent.getBroadcast(mCtx, 0, alarmIntent, 0);
    alarmMgr = (AlarmManager) mCtx.getSystemService(Context.ALARM_SERVICE);
    alarmMgr.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
            SystemClock.elapsedRealtime() + AlarmManager.INTERVAL_DAY,
            AlarmManager.INTERVAL_DAY, alarmPendingIntent);
}
 

private void insertIntoList(WifiObject wifi) {
    wifiArrayAdapter.add(wifi);

    final ProgressDialog progress = new ProgressDialog(getActivity());
    progress.setTitle("Learning");
    progress.setMessage("Please wait while we are collecting the Wifi APs around you...");
    progress.setCanceledOnTouchOutside(false);
    progress.show();

    Runnable progressRunnable = new Runnable() {
        @Override
        public void run() {
            progress.cancel();
            handler.removeCallbacks(runnableCode);
        }
    };
    Handler pdCanceller = new Handler();
    pdCanceller.postDelayed(progressRunnable, learnPeriodVal * 60 * 1000);
}
 

/**
 * Helper method to print out the lifecycle state of each Activity.  Note this has
 * been wrapped in a Handler to delay the output due to overlaps in lifecycle state
 * changes as one Activity launches another.
 * @link http://developer.android.com/guide/topics/fundamentals/activities.html#CoordinatingActivities
 * @param viewMethods TextView to list out the lifecycle methods called
 * @param viewStatus TextView to list out the status of all Activity classes
 */
public static void printStatus(final TextView viewMethods, final TextView viewStatus) {
    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
      public void run() {
        // Get the stack of Activity lifecycle methods called and print to TextView
        StringBuilder sbMethods = new StringBuilder();
        List<String> listMethods = mStatusTracker.getMethodList();
        for (String method : listMethods) {
            sbMethods.insert(0, method + "\r\n");
        }
        if(viewMethods != null) {
            viewMethods.setText(sbMethods.toString());
        }

        // Get the status of all Activity classes and print to TextView
        StringBuilder sbStatus = new StringBuilder();
        for (String key : mStatusTracker.keySet()) {
          sbStatus.insert(0,key + ": " + mStatusTracker.getStatus(key) + "\n");
        }
        if(viewStatus != null) {
            viewStatus.setText(sbStatus.toString());
        }
      }
    }, 750);
  }
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash_screen);

    final DatabaseHelper dbHelper = new DatabaseHelper(this);

    final AlphaAnimation alpha = new AlphaAnimation(1,0);
    alpha.setDuration(200);

    final RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.relativeSplash);

    final Handler handler = new Handler();

    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            relativeLayout.setAnimation(alpha);
        }
    }, 700);

    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            final Intent intent = new Intent(SplashScreenActivity.this, MainActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
            startActivity(intent);
            finish();
        }
    }, DURATION);

}
 

@Override
public void onTitleClick() {
    toggleExpandingElement(mEntry, mViewHolder.contentLayout);
    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            if (mItemClickListener != null) {
                mItemClickListener.onExpandedClick(mEntry);
            }
        }
    }, 300);
}
 

private void startAnimationThreadStuff(long delay) {
    if (updateThread != null && updateThread.isAlive())
        updateThread.interrupt();
    // Start animation after a delay so there's no missed frames while the app loads up
    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            if(!progressView.isIndeterminate()) {
                progressView.setProgress(0f);
                // Run thread to update progress every quarter second until full
                updateThread = new Thread(new Runnable() {
                    @Override
                    public void run() {
                        while (progressView.getProgress() < progressView.getMaxProgress() && !Thread.interrupted()) {
                            // Must set progress in UI thread
                            handler.post(new Runnable() {
                                @Override
                                public void run() {
                                    progressView.setProgress(progressView.getProgress() + 10);
                                }
                            });
                            SystemClock.sleep(250);
                        }
                    }
                });
                updateThread.start();
            }
            // Alias for resetAnimation, it's all the same
            progressView.startAnimation();
        }
    }, delay);
}
 

private void startBluetoothDiscovery() {
    deviceListView.removeAllViews();
    foundDevices.clear();

    central = new BluetoothCentral(getContext(), bluetoothCentralCallback, new Handler(Looper.getMainLooper()));
    central.scanForPeripherals();

    txtSearching.setVisibility(View.VISIBLE);
    txtSearching.setText(R.string.label_bluetooth_searching);
    progressBar.setVisibility(View.VISIBLE);

    progressHandler = new Handler();

    // Don't let the BLE discovery run forever
    progressHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            stopBluetoothDiscovery();

            txtSearching.setText(R.string.label_bluetooth_searching_finished);
            progressBar.setVisibility(View.GONE);

            BluetoothDeviceView notSupported = new BluetoothDeviceView(context);
            notSupported.setDeviceName(getString(R.string.label_scale_not_supported));
            notSupported.setSummaryText(getString(R.string.label_click_to_help_add_support));
            notSupported.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent notSupportedIntent = new Intent(Intent.ACTION_VIEW);
                    notSupportedIntent.setData(
                            Uri.parse("https://github.com/oliexdev/openScale/wiki/Supported-scales-in-openScale"));

                    startActivity(notSupportedIntent);
                }
            });
            deviceListView.addView(notSupported);
        }
    }, 20 * 1000);
}
 

private SelfCancelingListener(LocationManager manager) {
    mLocationManager = manager;
    mHandler = new Handler();
    mCancelRunnable = new Runnable() {
        @Override
        public void run() {
            mLocationManager.removeUpdates(SelfCancelingListener.this);
            sListener = null;
        }
    };
    mHandler.postDelayed(mCancelRunnable, REQUEST_TIMEOUT_MS);
}
 

@NonNull
@Override
public Result doWork() {
    try {
        //PPApplication.logE("AvoidRescheduleReceiverWorker.doWork", "xxx");

        PPApplication.startHandlerThreadPPScanners();
        final Handler handler = new Handler(PPApplication.handlerThreadPPScanners.getLooper());
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                enqueueWork();
            }
        }, 500);

        return Result.success();
    } catch (Exception e) {
        //Log.e("AvoidRescheduleReceiverWorker.doWork", Log.getStackTraceString(e));
        PPApplication.recordException(e);
        /*Handler _handler = new Handler(getApplicationContext().getMainLooper());
        Runnable r = new Runnable() {
            public void run() {
                android.os.Process.killProcess(android.os.Process.myPid());
            }
        };
        _handler.postDelayed(r, 1000);*/
        return Result.failure();
    }
}
 

public void shuffle() {
    final Handler handler = new Handler();
    handler.postDelayed(() -> {
        MusicPlayerRemote.openQueue(mData,0,true);
        //MusicPlayer.playAll(mContext, getRealSongIds(), 0, -1, Util.IdType.NA, false);
        randommize();
    },100);
}
 

private void checkDelayed() {
    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        public void run() {
            if (arePermissionsGranted())
                startService();
            else
                checkDelayed();
        }
    }, 1000);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //makes Window Fullscreen and show ontop of the Lockscreen
    getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
    getSupportActionBar().hide();
    setContentView(R.layout.activity_receiverpictureactivity);
    Window wind = this.getWindow();
    wind.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
    wind.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

    if (savedInstanceState != null) {
        if (savedInstanceState.getBoolean("ready", false)) {
            page = savedInstanceState.getInt("pageItem", 0);
            screenislocked();
        }
    }

    RateThisApp.onCreate(this);
    RateThisApp.showRateDialogIfNeeded(this);

    //periodically checks if the screen is locked, if it is calls screenislocked()
    handly = new Handler();
    goahead = new Runnable() {
        @Override
        public void run() {
            KeyguardManager myKM = (KeyguardManager) getApplication().getSystemService(Context.KEYGUARD_SERVICE);
            if (myKM != null) {
                if( myKM.inKeyguardRestrictedInputMode()) {
                    screenislocked();
                } else {
                    handly.postDelayed(goahead, 40);
                }
            } else {
                handly.postDelayed(goahead, 40);
            }
        }
    };
    goahead.run();

}
 

/**
 * @param context      Context of the app
 * @param event        Event to notify
 * @param eventsUsers  EventUser associated with this event
 * @param activeAction If actions will be shown
 * @param autoCancel   If force notification to auto-cancel in 5s (after subscription)
 */
public static void notify(final Context context, final Events event, EventsUsers eventsUsers, boolean activeAction, boolean autoCancel) {

    Intent notificationIntent = EventActivity.getIntent(context, event);
    PendingIntent intent = PendingIntent.getActivity(context, event.id, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    final NotificationCompat.Builder notificationBuilder = getBaseNotification(context)
            .setContentTitle(event.name.trim())
            .setContentText(event.description.replace('\n', ' '))
            .setWhen(event.beginAt.getTime())
            .setStyle(new NotificationCompat.BigTextStyle().bigText(event.description))
            .setGroup(context.getString(R.string.notifications_events_unique_id))
            .setChannelId(context.getString(R.string.notifications_events_unique_id))
            .setContentIntent(intent);
    if (event.kind != null)
        notificationBuilder.setSubText(event.kind.name());

    if (autoCancel) {
        notificationBuilder.addAction(R.drawable.ic_event_black_24dp, context.getString(R.string.notification_auto_clear), null);

        Handler h = new Handler();
        long delayInMilliseconds = 5000;
        h.postDelayed(() -> NotificationManagerCompat.from(context).cancel(context.getString(R.string.notifications_events_unique_id), event.id), delayInMilliseconds);

    } else if (activeAction) {
        Intent notificationIntentAction = new Intent(context, IntentEvent.class);
        if (eventsUsers != null) {
            notificationIntentAction.putExtra(IntentEvent.ACTION, IntentEvent.ACTION_DELETE);
            notificationIntentAction.putExtra(IntentEvent.CONTENT_EVENT_USER_ID, eventsUsers.id);
            notificationIntentAction.putExtra(IntentEvent.CONTENT_EVENT_ID, eventsUsers.eventId);
        } else {
            notificationIntentAction.putExtra(IntentEvent.ACTION, IntentEvent.ACTION_CREATE);
            notificationIntentAction.putExtra(IntentEvent.CONTENT_EVENT_ID, event.id);
        }
        // intentEvent.putExtra(EventActivity.ARG_EVENT, ServiceGenerator.getGson().toJson(event));

        PendingIntent intentAction = PendingIntent.getService(context, 1000000 + event.id, notificationIntentAction, PendingIntent.FLAG_UPDATE_CURRENT);

        if (eventsUsers == null) {
            notificationBuilder.addAction(R.drawable.ic_event_black_24dp, context.getString(R.string.event_subscribe), intentAction);
        } else if (!event.beginAt.after(new Date()))
            notificationBuilder.addAction(R.drawable.ic_event_black_24dp, context.getString(R.string.event_unsubscribe), null);
        else
            notificationBuilder.addAction(R.drawable.ic_event_black_24dp, context.getString(R.string.event_unsubscribe), intentAction);
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        notificationBuilder.setCategory(Notification.CATEGORY_EVENT);
    }

    Notification notification = notificationBuilder.build();

    notification.flags |= Notification.FLAG_AUTO_CANCEL;

    NotificationManagerCompat.from(context).notify(context.getString(R.string.notifications_events_unique_id), event.id, notification);
}
 

/**
 * Gets the node from the matching list by position and visit all it's ancestors, including
 * itself, to find the first visible and focusable target node. And perform focus on the target
 * node. If not found, post-delay some time to try again until reaching the retry limit.
 *
 * <p>: [Screen Search] The nodes, which are covered by software IME, are invisible at
 * the moment of closing IME.
 *
 * @param position the index value in the matched list.
 */
private void postPerformFocusNode(int position) {
  final AccessibilityNode clickedNode = searchState.getResult(position).node();

  if (clickedNode.isWebContainer()) {
    // Since we are able to find nodes outside of current screen for webView, we need to
    // ensure the selected node is in current screen so we could focus on it.
    clickedNode.showOnScreen(EVENT_ID_UNTRACKED);
  }

  final Handler handler = new Handler();
  handler.postDelayed(
      new Runnable() {
        int counter = 0;
        int counterLimit = 20;
        // The clickedNode is one of the nodes in the node cache, will be recycled when hide() API
        // been called, don't need to be recycled here.
        @Override
        public void run() {
          // Finding clickNodes's matching ancestor or self.
          AccessibilityNode focusableVisibleNode =
              clickedNode.getSelfOrMatchingAncestor(
                  AccessibilityNodeInfoUtils.FILTER_SHOULD_FOCUS);

          if (focusableVisibleNode != null) {
            // Set focus on the matching node.
            focusableVisibleNode.performAction(
                AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
            // Recycle focusableNode.
            AccessibilityNode.recycle(
                "SearchScreenOverlay.postPerformFocusNode()", focusableVisibleNode);
            // Close search UI.
            hide();
          } else {
            // Can not found a focusable visible node, post-delay to try again later or set as
            // the clicked node itself if exceed maximum retry.
            if (counter < counterLimit) {
              counter++;
              handler.postDelayed(this, DELAY_FIND_NODE_MILLISEC);
            } else {
              // Set focus on the clicked node.
              clickedNode.performAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
              // Close search UI.
              hide();
            }
          }
        }
      },
      DELAY_FIND_NODE_MILLISEC);
}
 

@Override
public void onClick(DialogInterface dialogInterface, int which) {
    ClipboardManager clipboard = (ClipboardManager) getActivity().getSystemService(Context.CLIPBOARD_SERVICE);
    Fragment fragment;
    final Bundle bundle = new Bundle();
    switch (which) {
        case 0:
            ClipData clipAddress = ClipData.newPlainText(getActivity().getString(R.string.address), address);
            clipboard.setPrimaryClip(clipAddress);
            break;
        case 1:
            fragment = new TangleExplorerTabFragment();
            bundle.putString(Constants.TANGLE_EXPLORER_SEARCH_ITEM, address);

            MainActivity mainActivity = (MainActivity) getActivity();
            mainActivity.showFragment(fragment);

            final Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    EventBus.getDefault().post(bundle);

                }
            }, 300);

            break;
        case 2:
            if (!isAddressUsed) {
                QRCode qrCode = new QRCode();
                qrCode.setAddress(address);
                bundle.putParcelable(Constants.QRCODE, qrCode);

                fragment = new GenerateQRCodeFragment();
                fragment.setArguments(bundle);

                getActivity().getFragmentManager().beginTransaction()
                        .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                        .replace(R.id.container, fragment, null)
                        .addToBackStack(null)
                        .commit();
            } else {
                Snackbar.make(getActivity().findViewById(R.id.drawer_layout), getString(R.string.messages_address_used), Snackbar.LENGTH_LONG).show();
            }
            break;
    }
}
 

/**
 * 淡出式停止,有bug，暂不使用
 *
 * @param handler
 */
public void fadeStop(Handler handler) {
    mFadeOutRunnable = new FadeOutRunnable(handler, FADE_DURATION);
    handler.postDelayed(mFadeOutRunnable, 1000);
}