android – 如何使用Google Maps v2快照？

我必须用谷歌地图发布的新的“快照制造商”解决这个问题,但我不知道如何做到这一点.
可以单独给我一个简单的例子吗？

这是我的代码：

public class MainActivity extends Activity {
static LatLng HAMBURG = new LatLng(47.524749,21.632745);
GoogleMap map;
File dbFile;
private File imageFile;


@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    polylineoptions line = new polylineoptions();

    map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
            .getMap();
    /*
     * Adatbázis
     */
    try {
        dbFile = getDatabasePath("/mnt/sdcard/Download/TeleSensors.db");
    } catch (Exception e) {

    }

    sqliteDatabase myDataBase = sqliteDatabase.openDatabase(
            dbFile.getAbsolutePath(),null,sqliteDatabase.OPEN_READONLY);

    Cursor curTAB = myDataBase.rawQuery("SELECT * FROM  GPS_Values;",null);

    Integer count = 0;
    while (curTAB.movetoNext()) {
        String s_latitude = curTAB.getString(1);
        String s_longitude = curTAB.getString(2);
        count++;
        double latitude = Double.parseDouble(s_latitude);
        double longitude = Double.parseDouble(s_longitude);
        line.add(new LatLng(latitude,longitude));

        Log.i("Coordinates",s_latitude.toString() + " --- " + s_longitude.toString());

    }
    curTAB.close();
    myDataBase.close();
    // adatbázis vége

    map.addpolyline(line);

    // map.setMapType(GoogleMap.MAP_TYPE_HYBRID);
    // map.setMapType(GoogleMap.MAP_TYPE_NONE);
    map.setMapType(GoogleMap.MAP_TYPE_norMAL);
    // map.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
    // map.setMapType(GoogleMap.MAP_TYPE_TERRAIN);

    // Move the camera instantly to hamburg with a zoom of 15.
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG,15));

    // Zoom in,animating the camera.
    map.animateCamera(CameraUpdateFactory.zoomTo(15),2000,null);  


}

}

谢谢你很好玩！

解决方法

您必须在按钮侦听器中调用Google maps快照方法,因为如果您应该太早地使用它,则会给您错误位图宽度必须大于0或类似于此.
这是代码

private void button_listener() {
        Button button = (Button) findViewById(R.id.button1);
        button.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SnapshotReadyCallback callback = new SnapshotReadyCallback() {
                    Bitmap bitmap;

                    @Override
                    public void onSnapshotReady(Bitmap snapshot) {
                        bitmap = snapshot;
                        try {
                            FileOutputStream out = new FileOutputStream("/mnt/sdcard/Download/TeleSensors.png");
                            bitmap.compress(Bitmap.CompressFormat.PNG,90,out);
                        } catch (Exception e) {
                            e.printstacktrace();
                        }
                    }
                };

                map.snapshot(callback);
            }
        });
    }