如何在NavigationDrawer中使用Google Map？ [英] How to use a Google Map in a NavigationDrawer?

问题描述

我对Coding相对较新，但请耐心等待。我正在尝试将Google地图放在导航抽屉中。我认为最好的方法是使用片段但是尽管我尝试了各种各样的尝试但我仍然遇到这个错误：错误：（35,62）错误：不兼容的类型：MapsActivity无法转换为片段。

I am relatively new to Coding but please bear with me. I am trying to put a Google Map in a navigation drawer. I figured the best way is to use fragments but despite my various attempts I keep getting this error: "Error:(35, 62) error: incompatible types: MapsActivity cannot be converted to Fragment".

我有两个活动
1. MainActiyity：哪里有错误。
2. MapsActivity：这是在Android工作室新项目创建时选择创建谷歌地图应用程序时的默认活动。

I have two Activities 1. MainActiyity: where there's an error. 2. MapsActivity: which is the default Activity when choosing to create google maps app on Android studio new project creation.

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;

import android.support.v4.app.FragmentActivity;


public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {    

NavigationView navigationView = null;
Toolbar toolbar = null;

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

    // Set to start with fragment
    MapsActivity fragment = new MapsActivity();
    android.support.v4.app.FragmentTransaction fragmentTransaction =
            getSupportFragmentManager().beginTransaction();
    fragmentTransaction.replace(R.id.fragment_container, fragment);
    fragmentTransaction.commit();


    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
}

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

@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;
}

@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();
    return super.onOptionsItemSelected(item);
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.nav_building) {
        MapsActivity fragment = new MapsActivity();
        android.support.v4.app.FragmentTransaction fragmentTransaction =
                getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.fragment_container, fragment);
        fragmentTransaction.commit();

    } else if (id == R.id.nav_map) {

    } else if (id == R.id.nav_timetable) {

    } else if (id == R.id.nav_noticeboard) {

    } else if (id == R.id.nav_settings) {

    } else if (id == R.id.nav_placeholder) {

    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}
}

此外，fragmentTransaction.replace中的fragment一词（R.id.fragment_container，片段）;
加下划线红色。
我试图找到不同的教程和指南，但没有解决我的问题。

Also, the word 'fragment' in fragmentTransaction.replace(R.id.fragment_container, fragment); is underlined red. I have tried to find different tutorials and guides but nothing solved my issue.

推荐答案

你不能做一个带活动的FragmentTransaction。

You can't do a FragmentTransaction with an Activity.

要在NavigationDrawer中使用Google Map，请使用扩展SupportMapFragment的Fragment，并添加MapsActivity类当前具有的所有功能。

In order to use a Google Map in a NavigationDrawer, use a Fragment that extends SupportMapFragment, and add all of the functionality that your MapsActivity class currently has.

使用此字母开头：

public class MapsFragment extends SupportMapFragment
        implements OnMapReadyCallback {

    GoogleMap mGoogleMap;

    @Override
    public void onResume() {
        super.onResume();

        setUpMapIfNeeded();
    }

    private void setUpMapIfNeeded() {

        if (mGoogleMap == null) {
            getMapAsync(this);
        }
    }

    @Override
    public void onMapReady(GoogleMap googleMap)
    {
        mGoogleMap=googleMap;
        mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
    }

}

然后在活动中，更改此使用片段：

Then in the Activity, change this to use the Fragment:

// Set to start with fragment
MapsFragment fragment = new MapsFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
        getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();

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