我正在尝试在我的应用上加载开放的街道地图。
我的代码如下:
import android.app.Activity;
import android.os.Bundle;
import org.osmdroid.config.Configuration;
import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
import org.osmdroid.views.MapView;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
public class OsmActivity extends Activity {
private MapView mMapView;
private MapController mMapController;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_osm);
Configuration.getInstance().setUserAgentValue(getPackageName());
mMapView = (MapView) findViewById(R.id.map);
mMapView.setTileSource(TileSourceFactory.DEFAULT_TILE_SOURCE);
mMapView.setBuiltInZoomControls(true);
mMapController = (MapController) mMapView.getController();
mMapController.setZoom(13);
GeoPoint gPt = new GeoPoint(51500000, -150000);
mMapController.setCenter(gPt);
}
}
我正在使用osmdroid 5.6.5(通过Maven)。
我根据osmdroid doc定义了我的用户代理。
Configuration.getInstance().setUserAgentValue(getPackageName());
我有这些API设置:
android {
compileSdkVersion 26
defaultConfig {
applicationId "com.loco_zero.locolizetestsosm"
minSdkVersion 21
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
有了这些权限:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
我有网格和缩放按钮,但地图不会显示。我收到这些错误:
I/StorageUtils: /sdcard is NOT writable
I/StorageUtils: /storage/emulated/0 is NOT writable
I/OsmDroid: Using tile source: Mapnik
E/SQLiteLog: (14) cannot open file at line 31278 of [2ef4f3a5b1]
E/SQLiteLog: (14) os_unix.c:31278: (13) open(/storage/emulated/0/osmdroid/tiles/cache.db) -
E/SQLiteDatabase: Failed to open database '/storage/emulated/0/osmdroid/tiles/cache.db'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
D/OsmDroid: Unable to store cached tile from Mapnik /13/4090/2719, database not available.
我究竟做错了什么?我可以告诉OSMDroid使用sdcard文件夹以外的东西吗?
编辑
我添加了以下内容以在运行时获取权限,它完成了诀窍:
if (Build.VERSION.SDK_INT >= 23) {
if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
Log.v(TAG, "Permission is granted");
} else {
Log.v(TAG, "Permission is revoked");
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
}
确保正确启用运行时权限..您将需要外部存储以及Internet存储。还要检查您的清单权限
在此行setContentView(R.layout.activity_osm);
之前添加以下行
IConfigurationProvider provider = Configuration.getInstance();
provider.setUserAgentValue(BuildConfig.APPLICATION_ID);
provider.setOsmdroidBasePath(getStorage());
provider.setOsmdroidTileCache(getStorage());
这实际上是一种奇怪的情况。首次启动时osmdroid会检测地图图块缓存的最大可写存储位置。如果没有找到,则默认为应用程序提供存储。我认为这不会发生在你的情况下,因为你没有打电话给这个
Configuration.getInstance().load(context, PreferenceManager.getDefaultSharedPreferences(context));
它可能需要更多文档中的可见性,但这将启动发现过程。这应该在创建地图视图之前完成。