从Nav Drawer启动Map活动

Question

我正在尝试开发从导航抽屉启动的地图活动。我看过this query。

我的代码是： -

MainActivity.java

package com.tadrish.last;

import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import android.content.Intent;


public class MainActivity extends AppCompatActivity
    implements NavigationDrawerCallbacks {

/**
 * Fragment managing the behaviors, interactions and presentation of the navigation drawer.
 */
private NavigationDrawerFragment mNavigationDrawerFragment;
private Toolbar mToolbar;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
    setSupportActionBar(mToolbar);

    mNavigationDrawerFragment = (NavigationDrawerFragment)
            getFragmentManager().findFragmentById(R.id.fragment_drawer);

    // Set up the drawer.
    mNavigationDrawerFragment.setup(R.id.fragment_drawer, (DrawerLayout) findViewById(R.id.drawer), mToolbar);
    // populate the navigation drawer
    mNavigationDrawerFragment.setUserData("John Doe", "johndoe@doe.com", BitmapFactory.decodeResource(getResources(), R.drawable.avatar));
}

@Override
public void onNavigationDrawerItemSelected(int position) {
    // update the main content by replacing fragments
    switch(position) {
        case 0:
            Intent a = new Intent(this, MapActivity.class);
            startActivity(a);
            break;
        case 1:
            break;
        case 2:
            break;
        default:
            break;
    }
    Toast.makeText(this, "Menu item selected -> " + (position +1), Toast.LENGTH_SHORT).show();
}


@Override
public void onBackPressed() {
    if (mNavigationDrawerFragment.isDrawerOpen())
        mNavigationDrawerFragment.closeDrawer();
    else
        super.onBackPressed();
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    if (!mNavigationDrawerFragment.isDrawerOpen()) {
        // Only show items in the action bar relevant to this screen
        // if the drawer is not showing. Otherwise, let the drawer
        // decide what to show in the action bar.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    return super.onCreateOptionsMenu(menu);
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}


}

MapActivity.java

package com.tadrish.last;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import org.json.JSONObject;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AutoCompleteTextView;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapActivity extends FragmentActivity{

AutoCompleteTextView atvPlaces;

DownloadTask placesDownloadTask;
DownloadTask placeDetailsDownloadTask;
ParserTask placesParserTask;
ParserTask placeDetailsParserTask;

GoogleMap googleMap;

final int PLACES=0;
final int PLACES_DETAILS=1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_map);

    // Getting a reference to the AutoCompleteTextView
    atvPlaces = (AutoCompleteTextView) findViewById(R.id.atv_places);
    atvPlaces.setThreshold(1);

    // Adding textchange listener
    atvPlaces.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // Creating a DownloadTask to download Google Places matching "s"
            placesDownloadTask = new DownloadTask(PLACES);

            // Getting url to the Google Places Autocomplete api
            String url = getAutoCompleteUrl(s.toString());

            // Start downloading Google Places
            // This causes to execute doInBackground() of DownloadTask class
            placesDownloadTask.execute(url);
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                                      int after) {
            // TODO Auto-generated method stub
        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
        }
    });

    // Setting an item click listener for the AutoCompleteTextView dropdown list
    atvPlaces.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int index,
                                long id) {

            ListView lv = (ListView) arg0;
            SimpleAdapter adapter = (SimpleAdapter) arg0.getAdapter();

            HashMap<String, String> hm = (HashMap<String, String>) adapter.getItem(index);

            // Creating a DownloadTask to download Places details of the selected place
            placeDetailsDownloadTask = new DownloadTask(PLACES_DETAILS);

            // Getting url to the Google Places details api
            String url = getPlaceDetailsUrl(hm.get("reference"));

            // Start downloading Google Place Details
            // This causes to execute doInBackground() of DownloadTask class
            placeDetailsDownloadTask.execute(url);

        }
    });
}

private String getAutoCompleteUrl(String place){

    // Obtain browser key from https://code.google.com/apis/console
    String key = "key=AIzaSyARE2P8bfAQUezyOG-Dn5AJ0oTmb6wTfcI";

    // place to be be searched
    String input = "input="+place;

    // place type to be searched
    String types = "types=geocode";

    // Sensor enabled
    String sensor = "sensor=false";

    // Building the parameters to the web service
    String parameters = input+"&"+types+"&"+sensor+"&"+key;

    // Output format
    String output = "json";

    // Building the url to the web service
    String url = "https://maps.googleapis.com/maps/api/place/autocomplete/"+output+"?"+parameters;

    return url;
}

private String getPlaceDetailsUrl(String ref){

    // Obtain browser key from https://code.google.com/apis/console
    String key = "key=AIzaSyARE2P8bfAQUezyOG-Dn5AJ0oTmb6wTfcI";

    // reference of place
    String reference = "reference="+ref;

    // Sensor enabled
    String sensor = "sensor=false";

    // Building the parameters to the web service
    String parameters = reference+"&"+sensor+"&"+key;

    // Output format
    String output = "json";

    // Building the url to the web service
    String url = "https://maps.googleapis.com/maps/api/place/details/"+output+"?"+parameters;

    return url;
}

/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
    String data = "";
    InputStream iStream = null;
    HttpURLConnection urlConnection = null;
    try{
        URL url = new URL(strUrl);

        // Creating an http connection to communicate with url
        urlConnection = (HttpURLConnection) url.openConnection();

        // Connecting to url
        urlConnection.connect();

        // Reading data from url
        iStream = urlConnection.getInputStream();

        BufferedReader br = new BufferedReader(new InputStreamReader(iStream));

        StringBuffer sb  = new StringBuffer();

        String line = "";
        while( ( line = br.readLine())  != null){
            sb.append(line);
        }

        data = sb.toString();

        br.close();

    }catch(Exception e){
        Log.d("Exception :", e.toString());
    }finally{
        iStream.close();
        urlConnection.disconnect();
    }
    return data;
}

// Fetches data from url passed
private class DownloadTask extends AsyncTask<String, Void, String>{

    private int downloadType=0;

    // Constructor
    public DownloadTask(int type){
        this.downloadType = type;
    }

    @Override
    protected String doInBackground(String... url) {

        // For storing data from web service
        String data = "";

        try{
            // Fetching the data from web service
            data = downloadUrl(url[0]);
        }catch(Exception e){
            Log.d("Background Task",e.toString());
        }
        return data;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);

        switch(downloadType){
            case PLACES:
                // Creating ParserTask for parsing Google Places
                placesParserTask = new ParserTask(PLACES);

                // Start parsing google places json data
                // This causes to execute doInBackground() of ParserTask class
                placesParserTask.execute(result);

                break;

            case PLACES_DETAILS :
                // Creating ParserTask for parsing Google Places
                placeDetailsParserTask = new ParserTask(PLACES_DETAILS);

                // Starting Parsing the JSON string
                // This causes to execute doInBackground() of ParserTask class
                placeDetailsParserTask.execute(result);
        }
    }
}

/** A class to parse the Google Places in JSON format */
private class ParserTask extends AsyncTask<String, Integer, List<HashMap<String,String>>>{

    int parserType = 0;

    public ParserTask(int type){
        this.parserType = type;
    }

    @Override
    protected List<HashMap<String, String>> doInBackground(String... jsonData) {

        JSONObject jObject;
        List<HashMap<String, String>> list = null;

        try{
            jObject = new JSONObject(jsonData[0]);

            switch(parserType){
                case PLACES :
                    PlaceJSONParser placeJsonParser = new PlaceJSONParser();
                    // Getting the parsed data as a List construct
                    list = placeJsonParser.parse(jObject);
                    break;
                case PLACES_DETAILS :
                    PlaceDetailsJSONParser placeDetailsJsonParser = new PlaceDetailsJSONParser();
                    // Getting the parsed data as a List construct
                    list = placeDetailsJsonParser.parse(jObject);
            }

        }catch(Exception e){
            Log.d("Exception",e.toString());
        }
        return list;
    }

    @Override
    protected void onPostExecute(List<HashMap<String, String>> result) {

        switch(parserType){
            case PLACES :
                String[] from = new String[] { "description"};
                int[] to = new int[] { android.R.id.text1 };

                // Creating a SimpleAdapter for the AutoCompleteTextView
                SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), result, android.R.layout.simple_list_item_1, from, to);

                // Setting the adapter
                atvPlaces.setAdapter(adapter);
                break;
            case PLACES_DETAILS :
                HashMap<String, String> hm = result.get(0);

                // Getting latitude from the parsed data
                double latitude = Double.parseDouble(hm.get("lat"));

                // Getting longitude from the parsed data
                double longitude = Double.parseDouble(hm.get("lng"));

                // Getting reference to the SupportMapFragment of the activity_main.xml
                SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);

                // Getting GoogleMap from SupportMapFragment
                googleMap = fm.getMap();

                LatLng point = new LatLng(latitude, longitude);

                CameraUpdate cameraPosition = CameraUpdateFactory.newLatLng(point);
                CameraUpdate cameraZoom = CameraUpdateFactory.zoomBy(5);

                // Showing the user input location in the Google Map
                googleMap.moveCamera(cameraPosition);
                googleMap.animateCamera(cameraZoom);

                MarkerOptions options = new MarkerOptions();
                options.position(point);
                options.title("Position");
                options.snippet("Latitude:"+latitude+",Longitude:"+longitude);

                // Adding the marker in the Google Map
                googleMap.addMarker(options);

                break;
        }
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
}

NavigationDrawerFragment.java

package com.tadrish.last;

import android.app.Activity;
import android.app.Fragment;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;


public class NavigationDrawerFragment extends Fragment implements NavigationDrawerCallbacks {

/**
 * Remember the position of the selected item.
 */
private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";

/**
 * Per the design guidelines, you should show the drawer on launch until the user manually
 * expands it. This shared preference tracks this.
 */
private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";

/**
 * A pointer to the current callbacks instance (the Activity).
 */
private NavigationDrawerCallbacks mCallbacks;

/**
 * Helper component that ties the action bar to the navigation drawer.
 */
private ActionBarDrawerToggle mActionBarDrawerToggle;

private DrawerLayout mDrawerLayout;
private RecyclerView mDrawerList;
private View mFragmentContainerView;

private int mCurrentSelectedPosition = 0;
private boolean mFromSavedInstanceState;
private boolean mUserLearnedDrawer;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Read in the flag indicating whether or not the user has demonstrated awareness of the
    // drawer. See PREF_USER_LEARNED_DRAWER for details.
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
    mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);

    if (savedInstanceState != null) {
        mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
        mFromSavedInstanceState = true;
    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
    mDrawerList = (RecyclerView) view.findViewById(R.id.drawerList);
    LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    mDrawerList.setLayoutManager(layoutManager);
    mDrawerList.setHasFixedSize(true);

    final List<NavigationItem> navigationItems = getMenu();
    NavigationDrawerAdapter adapter = new NavigationDrawerAdapter(navigationItems);
    adapter.setNavigationDrawerCallbacks(this);
    mDrawerList.setAdapter(adapter);
    selectItem(mCurrentSelectedPosition);
    return view;
}

public boolean isDrawerOpen() {
    return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}

public ActionBarDrawerToggle getActionBarDrawerToggle() {
    return mActionBarDrawerToggle;
}

public DrawerLayout getDrawerLayout() {
    return mDrawerLayout;
}

@Override
public void onNavigationDrawerItemSelected(int position) {
    selectItem(position);
}

public List<NavigationItem> getMenu() {
    List<NavigationItem> items = new ArrayList<NavigationItem>();
    items.add(new NavigationItem("Map", getResources().getDrawable(R.drawable.ic_action_map)));
    items.add(new NavigationItem("item 2", getResources().getDrawable(R.drawable.ic_menu_check)));
    items.add(new NavigationItem("item 3", getResources().getDrawable(R.drawable.ic_menu_check)));
    return items;
}

/**
 * Users of this fragment must call this method to set up the navigation drawer interactions.
 *
 * @param fragmentId   The android:id of this fragment in its activity's layout.
 * @param drawerLayout The DrawerLayout containing this fragment's UI.
 * @param toolbar      The Toolbar of the activity.
 */
public void setup(int fragmentId, DrawerLayout drawerLayout, Toolbar toolbar) {
    mFragmentContainerView = getActivity().findViewById(fragmentId);
    mDrawerLayout = drawerLayout;

    mDrawerLayout.setStatusBarBackgroundColor(getResources().getColor(R.color.myPrimaryDarkColor));

    mActionBarDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            if (!isAdded()) return;

            getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            if (!isAdded()) return;
            if (!mUserLearnedDrawer) {
                mUserLearnedDrawer = true;
                SharedPreferences sp = PreferenceManager
                        .getDefaultSharedPreferences(getActivity());
                sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
            }
            getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
        }
    };

    // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
    // per the navigation drawer design guidelines.
    if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
        mDrawerLayout.openDrawer(mFragmentContainerView);
    }

    // Defer code dependent on restoration of previous instance state.
    mDrawerLayout.post(new Runnable() {
        @Override
        public void run() {
            mActionBarDrawerToggle.syncState();
        }
    });

    mDrawerLayout.setDrawerListener(mActionBarDrawerToggle);
}

private void selectItem(int position) {
    mCurrentSelectedPosition = position;
    if (mDrawerLayout != null) {
        mDrawerLayout.closeDrawer(mFragmentContainerView);
    }
    if (mCallbacks != null) {
        mCallbacks.onNavigationDrawerItemSelected(position);
    }
    ((NavigationDrawerAdapter) mDrawerList.getAdapter()).selectPosition(position);
}

public void openDrawer() {
    mDrawerLayout.openDrawer(mFragmentContainerView);
}

public void closeDrawer() {
    mDrawerLayout.closeDrawer(mFragmentContainerView);
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mCallbacks = (NavigationDrawerCallbacks) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mCallbacks = null;
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    // Forward the new configuration the drawer toggle component.
    mActionBarDrawerToggle.onConfigurationChanged(newConfig);
}

public void setUserData(String user, String email, Bitmap avatar) {
    ImageView avatarContainer = (ImageView) mFragmentContainerView.findViewById(R.id.imgAvatar);
    ((TextView) mFragmentContainerView.findViewById(R.id.txtUserEmail)).setText(email);
    ((TextView) mFragmentContainerView.findViewById(R.id.txtUsername)).setText(user);
    avatarContainer.setImageDrawable(new RoundImage(avatar));
}

public View getGoogleDrawer() {
    return mFragmentContainerView.findViewById(R.id.googleDrawer);
}

public static class RoundImage extends Drawable {
    private final Bitmap mBitmap;
    private final Paint mPaint;
    private final RectF mRectF;
    private final int mBitmapWidth;
    private final int mBitmapHeight;

    public RoundImage(Bitmap bitmap) {
        mBitmap = bitmap;
        mRectF = new RectF();
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        final BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        mPaint.setShader(shader);

        mBitmapWidth = mBitmap.getWidth();
        mBitmapHeight = mBitmap.getHeight();
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.drawOval(mRectF, mPaint);
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);
        mRectF.set(bounds);
    }

    @Override
    public void setAlpha(int alpha) {
        if (mPaint.getAlpha() != alpha) {
            mPaint.setAlpha(alpha);
            invalidateSelf();
        }
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        mPaint.setColorFilter(cf);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }

    @Override
    public int getIntrinsicWidth() {
        return mBitmapWidth;
    }

    @Override
    public int getIntrinsicHeight() {
        return mBitmapHeight;
    }

    public void setAntiAlias(boolean aa) {
        mPaint.setAntiAlias(aa);
        invalidateSelf();
    }

    @Override
    public void setFilterBitmap(boolean filter) {
        mPaint.setFilterBitmap(filter);
        invalidateSelf();
    }

    @Override
    public void setDither(boolean dither) {
        mPaint.setDither(dither);
        invalidateSelf();
    }

    public Bitmap getBitmap() {
        return mBitmap;
    }

}
}

每当我打开应用程序时，它会自动从地图开始，并且没有导航抽屉。 其余代码改编自here和here

请帮帮我......或者指出我需要提供的任何其他信息