[android] file:// example

platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml

@@ -340,6 +340,14 @@
                 android:name="@string/category"
                 android:value="@string/category_style" />
         </activity>
+        <activity
+            android:name=".activity.style.StyleFileActivity"
+            android:description="@string/description_style_file"
+            android:label="@string/activity_style_file">
+            <meta-data
+                android:name="@string/category"
+                android:value="@string/category_style" />
+        </activity>
 
         <activity
             android:name=".activity.imagegenerator.PrintActivity"

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/StyleFileActivity.java

@@ -0,0 +1,173 @@
+package com.mapbox.mapboxsdk.testapp.activity.style;
+
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.RawRes;
+import android.support.design.widget.FloatingActionButton;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.util.Log;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Toast;
+
+import com.mapbox.mapboxsdk.maps.MapView;
+import com.mapbox.mapboxsdk.maps.MapboxMap;
+import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
+import com.mapbox.mapboxsdk.testapp.R;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.StringWriter;
+import java.io.Writer;
+
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleColor;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleRadius;
+
+/**
+ * Example on how to use a file:// resource for the style.json
+ */
+public class StyleFileActivity extends AppCompatActivity {
+  private static final String TAG = StyleFileActivity.class.getSimpleName();
+
+  private MapboxMap mapboxMap;
+  private MapView mapView;
+
+  @Override
+  public void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.activity_style_file);
+
+    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+    setSupportActionBar(toolbar);
+
+    ActionBar actionBar = getSupportActionBar();
+    if (actionBar != null) {
+      actionBar.setDisplayHomeAsUpEnabled(true);
+      actionBar.setDisplayShowHomeEnabled(true);
+    }
+
+    mapView = (MapView) findViewById(R.id.mapView);
+    mapView.onCreate(savedInstanceState);
+    mapView.getMapAsync(new OnMapReadyCallback() {
+      @Override
+      public void onMapReady(@NonNull final MapboxMap map) {
+        mapboxMap = map;
+
+        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
+        fab.setColorFilter(ContextCompat.getColor(StyleFileActivity.this, R.color.primary));
+        fab.setOnClickListener(new View.OnClickListener() {
+          @Override
+          public void onClick(View view) {
+            Log.i(TAG, "Loading style file");
+            new CreateStyleFileTask().execute();
+          }
+        });
+      }
+    });
+  }
+
+  /**
+   * Task to write a style file to local disk and load it in the map view
+   */
+  private class CreateStyleFileTask extends AsyncTask<Void, Integer, Long> {
+    private File cacheStyleFile;
+
+    @Override
+    protected Long doInBackground(Void... params) {
+      try {
+        cacheStyleFile = File.createTempFile("my-", ".style.json");
+        cacheStyleFile.createNewFile();
+        Log.i(TAG, "Writing style file to: " + cacheStyleFile.getAbsolutePath());
+        writeToFile(cacheStyleFile, readRawResource(R.raw.local_style));
+      } catch (Exception e) {
+        Toast.makeText(StyleFileActivity.this, "Could not create style file in cache dir", Toast.LENGTH_SHORT).show();
+      }
+      return 1l;
+    }
+
+    protected void onPostExecute(Long result) {
+      //Actual file:// usage
+      mapboxMap.setStyleUrl("file://" + cacheStyleFile.getAbsolutePath());
+    }
+
+    private String readRawResource(@RawRes int rawResource) throws IOException {
+      InputStream is = getResources().openRawResource(rawResource);
+      Writer writer = new StringWriter();
+      char[] buffer = new char[1024];
+      try {
+        Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
+        int n;
+        while ((n = reader.read(buffer)) != -1) {
+          writer.write(buffer, 0, n);
+        }
+      } finally {
+        is.close();
+      }
+
+      return writer.toString();
+    }
+
+    private void writeToFile(File file, String contents) throws IOException {
+      BufferedWriter writer = null;
+      try {
+        writer = new BufferedWriter(new FileWriter(file));
+        writer.write(contents);
+      } finally {
+        if (writer != null) {
+          writer.close();
+        }
+      }
+    }
+  }
+
+  @Override
+  public void onResume() {
+    super.onResume();
+    mapView.onResume();
+  }
+
+  @Override
+  public void onPause() {
+    super.onPause();
+    mapView.onPause();
+  }
+
+  @Override
+  public void onSaveInstanceState(Bundle outState) {
+    super.onSaveInstanceState(outState);
+    mapView.onSaveInstanceState(outState);
+  }
+
+  @Override
+  public void onLowMemory() {
+    super.onLowMemory();
+    mapView.onLowMemory();
+  }
+
+  @Override
+  public void onDestroy() {
+    super.onDestroy();
+    mapView.onDestroy();
+  }
+
+  @Override
+  public boolean onOptionsItemSelected(MenuItem item) {
+    switch (item.getItemId()) {
+      case android.R.id.home:
+        onBackPressed();
+        return true;
+      default:
+        return super.onOptionsItemSelected(item);
+    }
+  }
+}

platform/android/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_style_file.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <android.support.v7.widget.Toolbar
+        android:id="@+id/toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="?attr/actionBarSize"
+        android:background="@color/primary"
+        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />
+
+    <com.mapbox.mapboxsdk.maps.MapView
+        android:id="@id/mapView"
+        android:layout_below="@id/toolbar"
+        android:layout_width="match_parent"
+        app:center_latitude="52.519003"
+        app:center_longitude="13.400972"
+        app:style_url="@string/style_mapbox_streets"
+        app:zoom="16"
+        android:layout_height="match_parent"/>
+
+    <android.support.design.widget.FloatingActionButton
+        android:id="@id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentRight="true"
+        android:layout_margin="@dimen/fab_margin"
+        android:src="@drawable/ic_add_24dp"
+        app:backgroundTint="@android:color/white" />
+
+</RelativeLayout>