From 137dce1528a0f23d69c01a94d61391987ffd6d72 Mon Sep 17 00:00:00 2001
From: Fred Chung <fchung@google.com>
Date: Thu, 29 Mar 2012 19:15:58 -0700
Subject: [PATCH] Sample app for Android Training lesson: Making your app
 location aware.

Change-Id: I205a9e3f98823fbd90c5b770de8fe6ce8a9e345b
---
 .../location-aware/AndroidManifest.xml        |  38 ++
 .../res/drawable-hdpi/button_default.9.png    | Bin 0 -> 1468 bytes
 .../res/drawable-hdpi/button_on.9.png         | Bin 0 -> 1438 bytes
 .../res/drawable-hdpi/button_pressed.9.png    | Bin 0 -> 1463 bytes
 .../res/drawable-mdpi/button_default.9.png    | Bin 0 -> 3584 bytes
 .../res/drawable-mdpi/button_on.9.png         | Bin 0 -> 3559 bytes
 .../res/drawable-mdpi/button_pressed.9.png    | Bin 0 -> 3586 bytes
 .../res/drawable-xhdpi/button_default.9.png   | Bin 0 -> 3411 bytes
 .../res/drawable-xhdpi/button_on.9.png        | Bin 0 -> 3296 bytes
 .../res/drawable-xhdpi/button_pressed.9.png   | Bin 0 -> 3379 bytes
 .../res/drawable/button_active.xml            |  21 ++
 .../res/drawable/button_inactive.xml          |  21 ++
 .../location-aware/res/layout/main.xml        |  58 +++
 .../location-aware/res/values/strings.xml     |  26 ++
 .../android/location/LocationActivity.java    | 341 ++++++++++++++++++
 15 files changed, 505 insertions(+)
 create mode 100644 samples/training/location-aware/AndroidManifest.xml
 create mode 100644 samples/training/location-aware/res/drawable-hdpi/button_default.9.png
 create mode 100644 samples/training/location-aware/res/drawable-hdpi/button_on.9.png
 create mode 100644 samples/training/location-aware/res/drawable-hdpi/button_pressed.9.png
 create mode 100644 samples/training/location-aware/res/drawable-mdpi/button_default.9.png
 create mode 100644 samples/training/location-aware/res/drawable-mdpi/button_on.9.png
 create mode 100644 samples/training/location-aware/res/drawable-mdpi/button_pressed.9.png
 create mode 100644 samples/training/location-aware/res/drawable-xhdpi/button_default.9.png
 create mode 100644 samples/training/location-aware/res/drawable-xhdpi/button_on.9.png
 create mode 100644 samples/training/location-aware/res/drawable-xhdpi/button_pressed.9.png
 create mode 100644 samples/training/location-aware/res/drawable/button_active.xml
 create mode 100644 samples/training/location-aware/res/drawable/button_inactive.xml
 create mode 100644 samples/training/location-aware/res/layout/main.xml
 create mode 100644 samples/training/location-aware/res/values/strings.xml
 create mode 100644 samples/training/location-aware/src/com/example/android/location/LocationActivity.java

diff --git a/samples/training/location-aware/AndroidManifest.xml b/samples/training/location-aware/AndroidManifest.xml
new file mode 100644
index 000000000..0f13b11a5
--- /dev/null
+++ b/samples/training/location-aware/AndroidManifest.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.android.location"
+    android:versionCode="1"
+    android:versionName="1.0" >
+    <uses-sdk android:minSdkVersion="7"
+              android:targetSdkVersion="15" />
+
+    <!-- Fine access to location requires this permission.
+         This permission implies access coarse location. -->
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application android:label="@string/app_name" >
+        <activity android:name="com.example.android.location.LocationActivity"
+            android:label="@string/app_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
diff --git a/samples/training/location-aware/res/drawable-hdpi/button_default.9.png b/samples/training/location-aware/res/drawable-hdpi/button_default.9.png
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diff --git a/samples/training/location-aware/res/drawable/button_active.xml b/samples/training/location-aware/res/drawable/button_active.xml
new file mode 100644
index 000000000..be091fe62
--- /dev/null
+++ b/samples/training/location-aware/res/drawable/button_active.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true"
+        android:drawable="@drawable/button_pressed" />
+    <item android:drawable="@drawable/button_on" />
+</selector>
diff --git a/samples/training/location-aware/res/drawable/button_inactive.xml b/samples/training/location-aware/res/drawable/button_inactive.xml
new file mode 100644
index 000000000..4999a2180
--- /dev/null
+++ b/samples/training/location-aware/res/drawable/button_inactive.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true"
+        android:drawable="@drawable/button_pressed" />
+    <item android:drawable="@drawable/button_default" />
+</selector>
diff --git a/samples/training/location-aware/res/layout/main.xml b/samples/training/location-aware/res/layout/main.xml
new file mode 100644
index 000000000..658d2585e
--- /dev/null
+++ b/samples/training/location-aware/res/layout/main.xml
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+    <LinearLayout android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal" >
+        <Button android:id="@+id/provider_fine"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/use_fine_provider"
+            android:background="@drawable/button_inactive"
+            android:minWidth="160sp"
+            android:onClick="useFineProvider" />
+
+        <Button android:id="@+id/provider_both"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/use_both_providers"
+            android:background="@drawable/button_inactive"
+            android:minWidth="160sp"
+            android:onClick="useCoarseFineProviders" />
+    </LinearLayout>
+    <TextView android:id="@+id/label_latlng"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="22sp"
+        android:text="@string/latlng" />
+    <TextView android:id="@+id/latlng"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="20sp" />
+    <TextView android:id="@+id/label_address"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="22sp"
+        android:text="@string/address" />
+    <TextView android:id="@+id/address"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="20sp" />
+</LinearLayout>
diff --git a/samples/training/location-aware/res/values/strings.xml b/samples/training/location-aware/res/values/strings.xml
new file mode 100644
index 000000000..4d6a87f61
--- /dev/null
+++ b/samples/training/location-aware/res/values/strings.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2012 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.
+-->
+<resources>
+    <string name="app_name">Android Training: Location Update</string>
+    <string name="address">Address:</string>
+    <string name="latlng">Lat/Long:</string>
+    <string name="unknown">--Unknown--</string>
+    <string name="not_support_gps">GPS provider not supported</string>
+    <string name="not_support_network">Network provider not supported</string>
+    <string name="use_fine_provider">Use fine provider</string>
+    <string name="use_both_providers">Use both providers</string>
+</resources>
diff --git a/samples/training/location-aware/src/com/example/android/location/LocationActivity.java b/samples/training/location-aware/src/com/example/android/location/LocationActivity.java
new file mode 100644
index 000000000..93f4ce123
--- /dev/null
+++ b/samples/training/location-aware/src/com/example/android/location/LocationActivity.java
@@ -0,0 +1,341 @@
+/*
+ * Copyright (C) 2012 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.example.android.location;
+
+import android.annotation.SuppressLint;
+import android.app.Activity;
+import android.content.Context;
+import android.location.Address;
+import android.location.Geocoder;
+import android.location.Location;
+import android.location.LocationListener;
+import android.location.LocationManager;
+import android.os.AsyncTask;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Locale;
+
+public class LocationActivity extends Activity {
+    private TextView mLatLng;
+    private TextView mAddress;
+    private Button mFineProviderButton;
+    private Button mBothProviderButton;
+    private LocationManager mLocationManager;
+    private Handler mHandler;
+    private boolean mGeocoderAvailable;
+    private boolean mUseFine;
+    private boolean mUseBoth;
+
+    // Keys for maintaining UI states after rotation.
+    private static final String KEY_FINE = "use_fine";
+    private static final String KEY_BOTH = "use_both";
+    // UI handler codes.
+    private static final int UPDATE_ADDRESS = 1;
+    private static final int UPDATE_LATLNG = 2;
+
+    private static final int TEN_SECONDS = 10000;
+    private static final int TEN_METERS = 10;
+    private static final int TWO_MINUTES = 1000 * 60 * 2;
+
+    /**
+     * This sample demonstrates how to incorporate location based services in your app and
+     * process location updates.  The app also shows how to convert lat/long coordinates to
+     * human-readable addresses.
+     */
+    @SuppressLint("NewApi")
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.main);
+
+        // Restore apps state (if exists) after rotation.
+        if (savedInstanceState != null) {
+            mUseFine = savedInstanceState.getBoolean(KEY_FINE);
+            mUseBoth = savedInstanceState.getBoolean(KEY_BOTH);
+        } else {
+            mUseFine = false;
+            mUseBoth = false;
+        }
+        mLatLng = (TextView) findViewById(R.id.latlng);
+        mAddress = (TextView) findViewById(R.id.address);
+        // Receive location updates from the fine location provider (gps) only.
+        mFineProviderButton = (Button) findViewById(R.id.provider_fine);
+        // Receive location updates from both the fine (gps) and coarse (network) location
+        // providers.
+        mBothProviderButton = (Button) findViewById(R.id.provider_both);
+
+        // The isPresent() helper method is only available on Gingerbread or above.
+        mGeocoderAvailable =
+                Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD && Geocoder.isPresent();
+
+        // Handler for updating text fields on the UI like the lat/long and address.
+        mHandler = new Handler() {
+            public void handleMessage(Message msg) {
+                switch (msg.what) {
+                    case UPDATE_ADDRESS:
+                        mAddress.setText((String) msg.obj);
+                        break;
+                    case UPDATE_LATLNG:
+                        mLatLng.setText((String) msg.obj);
+                        break;
+                }
+            }
+        };
+        // Get a reference to the LocationManager object.
+        mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
+    }
+
+    // Restores UI states after rotation.
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putBoolean(KEY_FINE, mUseFine);
+        outState.putBoolean(KEY_BOTH, mUseBoth);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        setup();
+    }
+
+    // Stop receiving location updates whenever the Activity becomes invisible.
+    @Override
+    protected void onStop() {
+        super.onStop();
+        mLocationManager.removeUpdates(listener);
+    }
+
+    // Set up fine and/or coarse location providers depending on whether the fine provider or
+    // both providers button is pressed.
+    private void setup() {
+        Location gpsLocation = null;
+        Location networkLocation = null;
+        mLocationManager.removeUpdates(listener);
+        mLatLng.setText(R.string.unknown);
+        mAddress.setText(R.string.unknown);
+        // Get fine location updates only.
+        if (mUseFine) {
+            mFineProviderButton.setBackgroundResource(R.drawable.button_active);
+            mBothProviderButton.setBackgroundResource(R.drawable.button_inactive);
+            // Request updates from just the fine (gps) provider.
+            gpsLocation = requestUpdatesFromProvider(
+                    LocationManager.GPS_PROVIDER, R.string.not_support_gps);
+            // Update the UI immediately if a location is obtained.
+            if (gpsLocation != null) updateUILocation(gpsLocation);
+        } else if (mUseBoth) {
+            // Get coarse and fine location updates.
+            mFineProviderButton.setBackgroundResource(R.drawable.button_inactive);
+            mBothProviderButton.setBackgroundResource(R.drawable.button_active);
+            // Request updates from both fine (gps) and coarse (network) providers.
+            gpsLocation = requestUpdatesFromProvider(
+                    LocationManager.GPS_PROVIDER, R.string.not_support_gps);
+            networkLocation = requestUpdatesFromProvider(
+                    LocationManager.NETWORK_PROVIDER, R.string.not_support_network);
+
+            // If both providers return last known locations, compare the two and use the better
+            // one to update the UI.  If only one provider returns a location, use it.
+            if (gpsLocation != null && networkLocation != null) {
+                updateUILocation(getBetterLocation(gpsLocation, networkLocation));
+            } else if (gpsLocation != null) {
+                updateUILocation(gpsLocation);
+            } else if (networkLocation != null) {
+                updateUILocation(networkLocation);
+            }
+        }
+    }
+
+    /**
+     * Method to register location updates with a desired location provider.  If the requested
+     * provider is not available on the device, the app displays a Toast with a message referenced
+     * by a resource id.
+     *
+     * @param provider Name of the requested provider.
+     * @param errorResId Resource id for the string message to be displayed if the provider does
+     *                   not exist on the device.
+     * @return A previously returned {@link android.location.Location} from the requested provider,
+     *         if exists.
+     */
+    private Location requestUpdatesFromProvider(final String provider, final int errorResId) {
+        Location location = null;
+        if (mLocationManager.isProviderEnabled(provider)) {
+            mLocationManager.requestLocationUpdates(provider, TEN_SECONDS, TEN_METERS, listener);
+            location = mLocationManager.getLastKnownLocation(provider);
+        } else {
+            Toast.makeText(this, errorResId, Toast.LENGTH_LONG).show();
+        }
+        return location;
+    }
+
+    // Callback method for the "fine provider" button.
+    public void useFineProvider(View v) {
+        mUseFine = true;
+        mUseBoth = false;
+        setup();
+    }
+
+    // Callback method for the "both providers" button.
+    public void useCoarseFineProviders(View v) {
+        mUseFine = false;
+        mUseBoth = true;
+        setup();
+    }
+
+    private void doReverseGeocoding(Location location) {
+        // Since the geocoding API is synchronous and may take a while.  You don't want to lock
+        // up the UI thread.  Invoking reverse geocoding in an AsyncTask.
+        (new ReverseGeocodingTask(this)).execute(new Location[] {location});
+    }
+
+    private void updateUILocation(Location location) {
+        // We're sending the update to a handler which then updates the UI with the new
+        // location.
+        Message.obtain(mHandler,
+                UPDATE_LATLNG,
+                location.getLatitude() + ", " + location.getLongitude()).sendToTarget();
+
+        // Bypass reverse-geocoding only if the Geocoder service is available on the device.
+        if (mGeocoderAvailable) doReverseGeocoding(location);
+    }
+
+    private final LocationListener listener = new LocationListener() {
+
+        @Override
+        public void onLocationChanged(Location location) {
+            // A new location update is received.  Do something useful with it.  Update the UI with
+            // the location update.
+            updateUILocation(location);
+        }
+
+        @Override
+        public void onProviderDisabled(String provider) {
+        }
+
+        @Override
+        public void onProviderEnabled(String provider) {
+        }
+
+        @Override
+        public void onStatusChanged(String provider, int status, Bundle extras) {
+        }
+    };
+
+    /** Determines whether one Location reading is better than the current Location fix.
+      * Code taken from
+      * http://developer.android.com/guide/topics/location/obtaining-user-location.html
+      *
+      * @param newLocation  The new Location that you want to evaluate
+      * @param currentBestLocation  The current Location fix, to which you want to compare the new
+      *        one
+      * @return The better Location object based on recency and accuracy.
+      */
+    protected Location getBetterLocation(Location newLocation, Location currentBestLocation) {
+        if (currentBestLocation == null) {
+            // A new location is always better than no location
+            return newLocation;
+        }
+
+        // Check whether the new location fix is newer or older
+        long timeDelta = newLocation.getTime() - currentBestLocation.getTime();
+        boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
+        boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
+        boolean isNewer = timeDelta > 0;
+
+        // If it's been more than two minutes since the current location, use the new location
+        // because the user has likely moved.
+        if (isSignificantlyNewer) {
+            return newLocation;
+        // If the new location is more than two minutes older, it must be worse
+        } else if (isSignificantlyOlder) {
+            return currentBestLocation;
+        }
+
+        // Check whether the new location fix is more or less accurate
+        int accuracyDelta = (int) (newLocation.getAccuracy() - currentBestLocation.getAccuracy());
+        boolean isLessAccurate = accuracyDelta > 0;
+        boolean isMoreAccurate = accuracyDelta < 0;
+        boolean isSignificantlyLessAccurate = accuracyDelta > 200;
+
+        // Check if the old and new location are from the same provider
+        boolean isFromSameProvider = isSameProvider(newLocation.getProvider(),
+                currentBestLocation.getProvider());
+
+        // Determine location quality using a combination of timeliness and accuracy
+        if (isMoreAccurate) {
+            return newLocation;
+        } else if (isNewer && !isLessAccurate) {
+            return newLocation;
+        } else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
+            return newLocation;
+        }
+        return currentBestLocation;
+    }
+
+    /** Checks whether two providers are the same */
+    private boolean isSameProvider(String provider1, String provider2) {
+        if (provider1 == null) {
+          return provider2 == null;
+        }
+        return provider1.equals(provider2);
+    }
+
+    // AsyncTask encapsulating the reverse-geocoding API.  Since the geocoder API is blocked,
+    // we do not want to invoke it from the UI thread.
+    private class ReverseGeocodingTask extends AsyncTask<Location, Void, Void> {
+        Context mContext;
+
+        public ReverseGeocodingTask(Context context) {
+            super();
+            mContext = context;
+        }
+
+        @Override
+        protected Void doInBackground(Location... params) {
+            Geocoder geocoder = new Geocoder(mContext, Locale.getDefault());
+
+            Location loc = params[0];
+            List<Address> addresses = null;
+            try {
+                addresses = geocoder.getFromLocation(loc.getLatitude(), loc.getLongitude(), 1);
+            } catch (IOException e) {
+                e.printStackTrace();
+                // Update address field with the exception.
+                Message.obtain(mHandler, UPDATE_ADDRESS, e.toString()).sendToTarget();
+            }
+            if (addresses != null && addresses.size() > 0) {
+                Address address = addresses.get(0);
+                // Format the first line of address (if available), city, and country name.
+                String addressText = String.format("%s, %s, %s",
+                        address.getMaxAddressLineIndex() > 0 ? address.getAddressLine(0) : "",
+                        address.getLocality(),
+                        address.getCountryName());
+                // Update address field on UI.
+                Message.obtain(mHandler, UPDATE_ADDRESS, addressText).sendToTarget();
+            }
+            return null;
+        }
+    }
+}