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Android example source code file (LocationProviderProxy.java)

This example Android source code file (LocationProviderProxy.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, bundle, connection, content, context, dummylocationprovider, handler, ilocationprovider, location, locationproviderinterface, locationproviderproxy, network, networkinfo, os, remoteexception, runnable, service, serviceconnection, string, tag

The LocationProviderProxy.java Android example source code

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.location;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.location.ILocationProvider;
import android.location.Location;
import android.location.LocationProviderInterface;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.SystemClock;
import android.util.Log;

/**
 * A class for proxying location providers implemented as services.
 *
 * {@hide}
 */
public class LocationProviderProxy implements LocationProviderInterface {

    private static final String TAG = "LocationProviderProxy";

    private final Context mContext;
    private final String mName;
    private ILocationProvider mProvider;
    private Handler mHandler;
    private final Connection mServiceConnection = new Connection();

    // cached values set by the location manager
    private boolean mLocationTracking = false;
    private boolean mEnabled = false;
    private long mMinTime = -1;
    private int mNetworkState;
    private NetworkInfo mNetworkInfo;

    // for caching requiresNetwork, requiresSatellite, etc.
    private DummyLocationProvider mCachedAttributes;

    // constructor for proxying location providers implemented in a separate service
    public LocationProviderProxy(Context context, String name, String serviceName,
            Handler handler) {
        mContext = context;
        mName = name;
        mHandler = handler;
        mContext.bindService(new Intent(serviceName), mServiceConnection, Context.BIND_AUTO_CREATE);
    }

    private class Connection implements ServiceConnection {
        public void onServiceConnected(ComponentName className, IBinder service) {
            Log.d(TAG, "LocationProviderProxy.onServiceConnected " + className);
            synchronized (this) {
                mProvider = ILocationProvider.Stub.asInterface(service);
                if (mProvider != null) {
                    mHandler.post(mServiceConnectedTask);
                }
            }
        }

        public void onServiceDisconnected(ComponentName className) {
            Log.d(TAG, "LocationProviderProxy.onServiceDisconnected " + className);
            synchronized (this) {
                mProvider = null;
            }
        }
    }

    private Runnable mServiceConnectedTask = new Runnable() {
        public void run() {
            ILocationProvider provider;
            synchronized (mServiceConnection) {
                provider = mProvider;
                if (provider == null) {
                    return;
                }
            }

            if (mCachedAttributes == null) {
                try {
                    mCachedAttributes = new DummyLocationProvider(mName);
                    mCachedAttributes.setRequiresNetwork(provider.requiresNetwork());
                    mCachedAttributes.setRequiresSatellite(provider.requiresSatellite());
                    mCachedAttributes.setRequiresCell(provider.requiresCell());
                    mCachedAttributes.setHasMonetaryCost(provider.hasMonetaryCost());
                    mCachedAttributes.setSupportsAltitude(provider.supportsAltitude());
                    mCachedAttributes.setSupportsSpeed(provider.supportsSpeed());
                    mCachedAttributes.setSupportsBearing(provider.supportsBearing());
                    mCachedAttributes.setPowerRequirement(provider.getPowerRequirement());
                    mCachedAttributes.setAccuracy(provider.getAccuracy());
                } catch (RemoteException e) {
                    mCachedAttributes = null;
                }
            }

            // resend previous values from the location manager if the service has restarted
            try {
                if (mEnabled) {
                    provider.enable();
                }
                if (mLocationTracking) {
                    provider.enableLocationTracking(true);
                }
                if (mMinTime >= 0) {
                    provider.setMinTime(mMinTime);
                }
                if (mNetworkInfo != null) {
                    provider.updateNetworkState(mNetworkState, mNetworkInfo);
                }
            } catch (RemoteException e) {
            }
        }
    };

    public String getName() {
        return mName;
    }

    public boolean requiresNetwork() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.requiresNetwork();
        } else {
            return false;
        }
    }

    public boolean requiresSatellite() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.requiresSatellite();
        } else {
            return false;
        }
    }

    public boolean requiresCell() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.requiresCell();
        } else {
            return false;
        }
    }

    public boolean hasMonetaryCost() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.hasMonetaryCost();
        } else {
            return false;
        }
    }

    public boolean supportsAltitude() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.supportsAltitude();
        } else {
            return false;
        }
    }

    public boolean supportsSpeed() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.supportsSpeed();
        } else {
            return false;
        }
    }

     public boolean supportsBearing() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.supportsBearing();
        } else {
            return false;
        }
    }

    public int getPowerRequirement() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.getPowerRequirement();
        } else {
            return -1;
        }
    }

    public int getAccuracy() {
        if (mCachedAttributes != null) {
            return mCachedAttributes.getAccuracy();
        } else {
            return -1;
        }
    }

    public void enable() {
        mEnabled = true;
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.enable();
            } catch (RemoteException e) {
            }
        }
    }

    public void disable() {
        mEnabled = false;
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.disable();
            } catch (RemoteException e) {
            }
        }
    }

    public boolean isEnabled() {
        return mEnabled;
    }

    public int getStatus(Bundle extras) {
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                return provider.getStatus(extras);
            } catch (RemoteException e) {
            }
        }
        return 0;
    }

    public long getStatusUpdateTime() {
         ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                return provider.getStatusUpdateTime();
            } catch (RemoteException e) {
            }
        }
        return 0;
     }

    public String getInternalState() {
        try {
            return mProvider.getInternalState();
        } catch (RemoteException e) {
            Log.e(TAG, "getInternalState failed", e);
            return null;
        }
    }

    public boolean isLocationTracking() {
        return mLocationTracking;
    }

    public void enableLocationTracking(boolean enable) {
        mLocationTracking = enable;
        if (!enable) {
            mMinTime = -1;
        }
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.enableLocationTracking(enable);
            } catch (RemoteException e) {
            }
        }
    }

    public long getMinTime() {
        return mMinTime;
    }

    public void setMinTime(long minTime) {
       mMinTime = minTime;
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.setMinTime(minTime);
            } catch (RemoteException e) {
            }
        }
    }

    public void updateNetworkState(int state, NetworkInfo info) {
        mNetworkState = state;
        mNetworkInfo = info;
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.updateNetworkState(state, info);
            } catch (RemoteException e) {
            }
        }
    }

    public void updateLocation(Location location) {
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.updateLocation(location);
            } catch (RemoteException e) {
            }
        }
    }

    public boolean sendExtraCommand(String command, Bundle extras) {
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.sendExtraCommand(command, extras);
            } catch (RemoteException e) {
            }
        }
        return false;
    }

    public void addListener(int uid) {
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.addListener(uid);
            } catch (RemoteException e) {
            }
        }
    }

    public void removeListener(int uid) {
        ILocationProvider provider;
        synchronized (mServiceConnection) {
            provider = mProvider;
        }
        if (provider != null) {
            try {
                provider.removeListener(uid);
            } catch (RemoteException e) {
            }
        }
    }
}

Other Android examples (source code examples)

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