Java Code Examples for android.os.Handler

private void initTransactionHistoryRecycler() {
    TransHistoryAdapter adapter = new TransHistoryAdapter();
    new Handler();
    adapter.setItemClickListener(new TransHistoryAdapter.OnItemClickListener() {
        @Override
        public void OnItemClick(int position) {
            Intent detailsIntent = new Intent(getActivity(), TransactionDetailsActivity.class);
            detailsIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            detailsIntent.putExtra(EXTRA_TRANSACTION_POSITION, position);
            startActivity(detailsIntent);
            getActivity().overridePendingTransition(R.anim.slide_in_left, R.anim.no_slide);
        }
    });

    final LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);

    rvTransactionsList.setLayoutManager(layoutManager);
    rvTransactionsList.setAdapter(adapter);

}
 

/**
 * Construct a new SystemUiHelper.
 *
 * @param activity The Activity who's system UI should be changed
 * @param level The level of hiding. Should be either {@link #LEVEL_LOW_PROFILE},
 *              {@link #LEVEL_HIDE_STATUS_BAR}, {@link #LEVEL_LEAN_BACK} or
 *              {@link #LEVEL_IMMERSIVE}
 * @param flags Additional options. See {@link #FLAG_LAYOUT_IN_SCREEN_OLDER_DEVICES} and
 *              {@link #FLAG_IMMERSIVE_STICKY}
 * @param listener A listener which is called when the system visibility is changed
 */
public SystemUiHelper(Activity activity, int level, int flags,
        OnVisibilityChangeListener listener) {

    mHandler = new Handler(Looper.getMainLooper());
    mHideRunnable = new HideRunnable();

    // Create impl
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        mImpl = new SystemUiHelperImplKK(activity, level, flags, listener);
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        mImpl = new SystemUiHelperImplJB(activity, level, flags, listener);
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        mImpl = new SystemUiHelperImplICS(activity, level, flags, listener);
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        mImpl = new SystemUiHelperImplHC(activity, level, flags, listener);
    } else {
        mImpl = new SystemUiHelperImplBase(activity, level, flags, listener);
    }
}
 

@Override
    protected void onInit() {
        super.onInit();
        currentFragment = FragmentFactory.newFragment(C.fragment.HOME);
        addFragment(currentFragment, R.id.fragment_container);
        menuHelper = new MenuHelper();
        menuHelper.createMenu(menu, presenter.getMenuData());
        handler = new Handler(Looper.getMainLooper());
        FirHelper.getInstance().checkUpdate(this);
//        NetRequest.Instance().uploadHeadPic(new File("/storage/emulated/0/Download/trim.jpg"));
//        NetRequest.Instance().editSign("求仁而得仁，又何怨 发愤忘食，乐以忘忧，不知老之将至 敬鬼神而远之 子罕言利，与命，与仁", new NetRequest.RequestListener<String>() {
//            @Override
//            public void success(String s) {
//
//            }
//
//            @Override
//            public void error(BmobException err) {
//
//            }
//        });
    }
 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getActionBar().setTitle(R.string.title_devices);
    mHandler = new Handler();

    // Use this check to determine whether BLE is supported on the device.  Then you can
    // selectively disable BLE-related features.
    if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
        Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
        finish();
    }

    // Initializes a Bluetooth adapter.  For API level 18 and above, get a reference to
    // BluetoothAdapter through BluetoothManager.
    final BluetoothManager bluetoothManager =
            (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
    mBluetoothAdapter = bluetoothManager.getAdapter();

    // Checks if Bluetooth is supported on the device.
    if (mBluetoothAdapter == null) {
        Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
        finish();
        return;
    }
}
 

static void cancelWork(final Context context, final boolean useHandler/*, final Handler _handler*/) {
    //PPApplication.logE("WifiScanWorker.cancelWork", "xxx");

    if (useHandler /*&& (_handler == null)*/) {
        PPApplication.startHandlerThreadPPScanners();
        final Handler handler = new Handler(PPApplication.handlerThreadPPScanners.getLooper());
        handler.post(new Runnable() {
            @Override
            public void run() {
                _cancelWork(context);
            }
        });
    }
    else {
        _cancelWork(context);
    }
}
 

private void initView(ViewGroup root) {
    mRecyclerView = (RecyclerView) root.findViewById(R.id.test_recycler);
    mSwipeRefreshLayout = (SwipeRefreshLayout) root.findViewById(R.id.refresh_layout);
    mSwipeRefreshLayout.setEnabled(getArguments().getBoolean(REFRESH_SUPPORT));
    mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
    mRecyclerView.setItemAnimator(new DefaultItemAnimator());
    mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    mSwipeRefreshLayout.setRefreshing(false);
                }
            }, 2000);
        }
    });
}
 

@Override
public void onMajorTextUpdate(String majorText){
    if(platesHash.contains(majorText))
        return;

    // new entries
    platesHash.add(majorText);
    platesQueue.add(majorText);
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            platesHash.remove(platesQueue.remove());
            updatePlates();
        }
    },30*1000);
    if(platesQueue.size() > NUM_PLATES) {
        platesHash.remove(platesQueue.remove());
    }
    if(vehicleNumber.getText()!=null && vehicleNumber.getText().toString().equals("") && !majorText.equals("")) {
        vehicleNumber.setText(majorText);
    }
    updatePlates();
    Log.d(TAG,"Updated majorText: "+majorText);
}
 

protected void changeState(final int s, final String msg) {
    Handler handler = new Handler(Looper.getMainLooper());
    handler.post(new Runnable() {
        @Override
        public void run() {
            if (state != s || msg != null) {
                if (callbacksCount > 0) {
                    int n = callbacks.beginBroadcast();
                    for (int i = 0; i < n; i++) {
                        try {
                            callbacks.getBroadcastItem(i).stateChanged(s, binder.getProfileName(), msg);
                        } catch (Exception e) {
                            // Ignore
                        }
                    }
                    callbacks.finishBroadcast();
                }
                state = s;
            }
        }
    });
}
 

@Override
public void onPageScrollStateChanged(int state) {
    super.onPageScrollStateChanged(state);
    switch (state) {
        case ViewPager.SCROLL_STATE_SETTLING:
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    LongClickableLinkMovementMethod.getInstance().setLongClickable(true);

                }
            }, ViewConfiguration.getLongPressTimeout());
            break;
        default:
            LongClickableLinkMovementMethod.getInstance().setLongClickable(false);
            break;
    }
}
 

/**
 * Syncs Audio genres and forwards calls to sync albums:
 * Genres->Albums->Songs
 */
private void chainCallSyncGenres(final SyncOrchestrator orchestrator,
                                 final HostConnection hostConnection,
                                 final Handler callbackHandler,
                                 final ContentResolver contentResolver) {
    final int hostId = hostConnection.getHostInfo().getId();

    // Genres->Albums->Songs
    AudioLibrary.GetGenres action = new AudioLibrary.GetGenres(getGenresProperties);
    action.execute(hostConnection, new ApiCallback<List<LibraryType.DetailsGenre>>() {
        @Override
        public void onSuccess(List<LibraryType.DetailsGenre> result) {
            if (result != null)
                insertGenresItems(hostId, result, contentResolver);

            chainCallSyncAlbums(orchestrator, hostConnection, callbackHandler, contentResolver, 0);
        }

        @Override
        public void onError(int errorCode, String description) {
            // Ok, something bad happend, just quit
            orchestrator.syncItemFailed(errorCode, description);
        }
    }, callbackHandler);
}
 

@Override
public void onCharacteristicWrite(final BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic, final int status) {
    Log.e(TAG, "OnCharacteristic WRITE started: "
            + getUUIDName(characteristic.getUuid())
            + " status: " + getStatusName(status));
    //Log.e(TAG, "Write Status " + String.valueOf(status));
    //Log.e(TAG, "Characteristic " + String.valueOf(characteristic.getUuid()));

    if (enforceMainThread()) {
        Handler iHandler = new Handler(Looper.getMainLooper());
        iHandler.post(new Runnable() {
            @Override
            public void run() {
                processOnCharacteristicWrite(gatt, characteristic, status);
            }
        });
    } else {
        processOnCharacteristicWrite(gatt, characteristic, status);
    }


}
 

private void _log(String logMsg) {

    if (_isCurrentlyOnMainThread()) {
      _logs.add(0, logMsg + " (main thread) ");
      _adapter.clear();
      _adapter.addAll(_logs);
    } else {
      _logs.add(0, logMsg + " (NOT main thread) ");

      // You can only do below stuff on main thread.
      new Handler(Looper.getMainLooper())
          .post(
              () -> {
                _adapter.clear();
                _adapter.addAll(_logs);
              });
    }
  }
 

private void initRecorder() {
    final int bufferSize = 2 * AudioRecord.getMinBufferSize(RECORDER_SAMPLE_RATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
    audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, RECORDER_SAMPLE_RATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSize);
    AudioUtil.initProcessor(RECORDER_SAMPLE_RATE, RECORDER_CHANNELS, RECORDER_ENCODING_BIT);

    recordingThread = new Thread("recorder") {
        @Override
        public void run() {
            super.run();
            buffer = new byte[bufferSize];
            Looper.prepare();
            audioRecord.setRecordPositionUpdateListener(recordPositionUpdateListener, new Handler(Looper.myLooper()));
            int bytePerSample = RECORDER_ENCODING_BIT / 8;
            float samplesToDraw = bufferSize / bytePerSample;
            audioRecord.setPositionNotificationPeriod((int) samplesToDraw);
            //We need to read first chunk to motivate recordPositionUpdateListener.
            //Mostly, for lower versions - https://code.google.com/p/android/issues/detail?id=53996
            audioRecord.read(buffer, 0, bufferSize);
            Looper.loop();
        }
    };
}
 

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.iv_back:
            finish();
            break;
        case R.id.iv_finish:
            String slognName = mUsercenterSign.getText().toString();
            if (slognName != null && slognName.length() > 0) {
                Toast.makeText(IndividualityActivity.this, slognName, Toast.LENGTH_SHORT).show();
                KeyBoard.closeSoftKeyboard(IndividualityActivity.this);
                PreferencesUtils.saveSlognName(IndividualityActivity.this, slognName);
                Intent intent = new Intent();
                setResult(100, intent);
                new Handler().postDelayed(() -> finish(), 500);
            }
            break;
    }
}
 

public void showMoreData(final List<T> dataList) {
    int delay = 0;
    if (TimeUtils.getCurrentTime() - currentTime < DEF_DELAY) {
        delay = DEF_DELAY;
    }
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            currentState = STATE_NORMAL;
            if (dataList.isEmpty()) {
                mAdapter.setHasMoreDataAndFooter(false, false);
                getHolder().showMsgInBottom(R.string.msg_no_more_data);
            } else {
                mAdapter.appendToList(dataList);
                currentPage++;
                mAdapter.setHasMoreDataAndFooter(true, false);
            }
            mAdapter.notifyDataSetChanged();
        }
    }, delay);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    handler = new Handler();
    setContentView(R.layout.activity_qrcode_upload);
    Intent intent = getIntent();
    currentPhotoString = intent.getStringExtra("file");
    ImageView img = findViewById(R.id.image_view);
    img.setImageURI(Uri.fromFile(new File(currentPhotoString)));
    eMoney = findViewById(R.id.txt_money);
    eName = findViewById(R.id.txt_name);
    upButton = findViewById(R.id.btn_upload);
    upButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            toUpload();
        }
    });
    loadImage();
}
 

/**
 * Sets the handler used to invoke listeners.
 *
 * @hide
 */
public void setListenerHandler(Handler handler) {
    if (mListenerHandler == null) {
        mOnStart = new Runnable() {
            public void run() {
                if (mListener != null) {
                    mListener.onAnimationStart(Animation.this);
                }
            }
        };
        mOnRepeat = new Runnable() {
            public void run() {
                if (mListener != null) {
                    mListener.onAnimationRepeat(Animation.this);
                }
            }
        };
        mOnEnd = new Runnable() {
            public void run() {
                if (mListener != null) {
                    mListener.onAnimationEnd(Animation.this);
                }
            }
        };
    }
    mListenerHandler = handler;
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_welcome);
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            Intent welcome = new Intent(WelcomeActivity.this, CameraActivity.class);
            startActivity(welcome);
            finish();
        }
    },SPLASH_TIME);
}
 

/**
 * @deprecated Use {@link #newWidevineInstance(MediaDrmCallback, HashMap)} and {@link
 *     #addListener(Handler, DefaultDrmSessionEventListener)}.
 */
@Deprecated
public static DefaultDrmSessionManager<FrameworkMediaCrypto> newWidevineInstance(
    MediaDrmCallback callback,
    HashMap<String, String> optionalKeyRequestParameters,
    Handler eventHandler,
    DefaultDrmSessionEventListener eventListener)
    throws UnsupportedDrmException {
  DefaultDrmSessionManager<FrameworkMediaCrypto> drmSessionManager =
      newWidevineInstance(callback, optionalKeyRequestParameters);
  if (eventHandler != null && eventListener != null) {
    drmSessionManager.addListener(eventHandler, eventListener);
  }
  return drmSessionManager;
}
 

private void startBackgroundThread() {
    Log.i(LOGTAG, "startBackgroundThread");
    stopBackgroundThread();
    mBackgroundThread = new HandlerThread("CameraBackground");
    mBackgroundThread.start();
    mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
}
 

public WebSocketClient(URI uri, Listener listener, List<BasicNameValuePair> extraHeaders) {
    mURI          = uri;
    mListener = listener;
    mExtraHeaders = extraHeaders;
    mParser       = new HybiParser(this);

    mHandlerThread = new HandlerThread("websocket-thread");
    mHandlerThread.start();
    mHandler = new Handler(mHandlerThread.getLooper());
}
 

private void startBackgroundThread() {
    Log.i(LOGTAG, "startBackgroundThread");
    stopBackgroundThread();
    mBackgroundThread = new HandlerThread("OpenCVCameraBackground");
    mBackgroundThread.start();
    mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
}
 

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    sDialogCanceled = false;
    mCastController = (IVideoCastController) activity;
    mHandler = new Handler();
    try {
        mCastManager = VideoCastManager.getInstance(activity);
    } catch (CastException e) {
        // logged already
    }
}
 

public BatteryService(Context context) {
    super(context);

    mContext = context;
    mHandler = new Handler(true /*async*/);
    mLed = new Led(context, getLocalService(LightsManager.class));
    mBatteryStats = BatteryStatsService.getService();
    mActivityManagerInternal = LocalServices.getService(ActivityManagerInternal.class);

    mCriticalBatteryLevel = mContext.getResources().getInteger(
            com.android.internal.R.integer.config_criticalBatteryWarningLevel);
    mLowBatteryWarningLevel = mContext.getResources().getInteger(
            com.android.internal.R.integer.config_lowBatteryWarningLevel);
    mLowBatteryCloseWarningLevel = mLowBatteryWarningLevel + mContext.getResources().getInteger(
            com.android.internal.R.integer.config_lowBatteryCloseWarningBump);
    mShutdownBatteryTemperature = mContext.getResources().getInteger(
            com.android.internal.R.integer.config_shutdownBatteryTemperature);

    mBatteryLevelsEventQueue = new ArrayDeque<>();
    mMetricsLogger = new MetricsLogger();

    // watch for invalid charger messages if the invalid_charger switch exists
    if (new File("/sys/devices/virtual/switch/invalid_charger/state").exists()) {
        UEventObserver invalidChargerObserver = new UEventObserver() {
            @Override
            public void onUEvent(UEvent event) {
                final int invalidCharger = "1".equals(event.get("SWITCH_STATE")) ? 1 : 0;
                synchronized (mLock) {
                    if (mInvalidCharger != invalidCharger) {
                        mInvalidCharger = invalidCharger;
                    }
                }
            }
        };
        invalidChargerObserver.startObserving(
                "DEVPATH=/devices/virtual/switch/invalid_charger");
    }
}
 

/**
 * Set an event listener and an executor Handler
 *
 * @param listener see {@link VLCEvent.Listener}
 * @param handler  Handler in which events are sent. If null, a handler will be created running on the main thread
 */
protected synchronized void setEventListener(VLCEvent.Listener<T> listener, Handler handler) {
    if (mHandler != null)
        mHandler.removeCallbacksAndMessages(null);
    mEventListener = listener;
    if (mEventListener == null)
        mHandler = null;
    else if (mHandler == null)
        mHandler = handler != null ? handler : new Handler(Looper.getMainLooper());
}
 

@Test
public void checksStopDispatchingWhenStop() {
  List<Location> anyLocations = mock(List.class);
  Handler aHandler = mock(Handler.class);
  ReplayLocationDispatcher theReplayLocationDispatcher = new ReplayLocationDispatcher(anyLocations, aHandler);

  theReplayLocationDispatcher.stop();

  verify(aHandler, times(1)).removeCallbacks(eq(theReplayLocationDispatcher));
}
 

private synchronized void connectToDevice(BluetoothDevice device) {
    if (JoH.ratelimit("G5connect-rate", 2)) {

        Log.d(TAG, "connectToDevice() start");
        if (mGatt != null) {
            Log.i(TAG, "BGatt isnt null, Closing.");
            try {
                mGatt.close();
            } catch (NullPointerException e) {
                // concurrency related null pointer
            }
            mGatt = null;
        }
        Log.i(TAG, "Request Connect");
        final BluetoothDevice mDevice = device;
        if (enforceMainThread()) {
            Handler iHandler = new Handler(Looper.getMainLooper());
            iHandler.post(new Runnable() {
                @Override
                public void run() {
                    connectGatt(mDevice);
                }
            });
        } else {
            connectGatt(mDevice);
        }

    } else {
        Log.e(TAG, "connectToDevice baulking due to rate-limit");
    }
}
 

public TimerTask(final Handler handler, final int what, final long delay, final long period, final int triggerLimit) {
    this.handler = handler;
    this.notifyWhat = what;
    this.delay = delay;
    this.period = period;
    this.triggerLimit = triggerLimit;
}
 

Handler getHandler() {
    try {
        handlerInitLatch.await();
    } catch (InterruptedException ie) {
        // continue?
    }
    return handler;
}
 

public void onVideoFragmentResume() {
    if (isResumePlay() && mYouTubePlayer != null) {
        // For some reason calling mYouTubePlayer.play() right away is ineffective
        final Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
               mYouTubePlayer.play();
            }
        }, 1);
    }
}