如何在NavigationDrawer中使用Google Map？

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，但尽管我尝试了各种各样的尝试，我仍然会收到此错误：“错误：（35,62）错误：不兼容的类型：MapsActivity无法转换为片段”。

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

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，fragment）; 红色下划线。 我试图找到不同的教程和指南，但没有解决我的问题。

Answer 1

你不能用Activity做FragmentTransaction。

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function。

使用此开头：

 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Activity中，将其更改为使用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();