java - 抽屉导航中的 map Activity

Question

我在抽屉导航中显示 map Activity 时遇到问题。这是我的代码。

MainActivity.java(这是我的抽屉导航)

public class MainActivity extends ActionBarActivity {

private ListView mDrawerList;
private DrawerLayout mDrawerLayout;
private ArrayAdapter<String> mAdapter;
private ActionBarDrawerToggle mDrawerToggle;
private String mActivityTitle;

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

    mDrawerList = (ListView)findViewById(R.id.navList);
    mDrawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
    mActivityTitle = getTitle().toString();

    addDrawerItems();
    setupDrawer();

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setHomeButtonEnabled(true);
}

private void addDrawerItems() {
    String[] Array = { "Driver Details", "Track Me", "Contact", "Report Driver", "Call For Emergency", "Rate Taxi", "Favorites", "Top Drivers", "Security Tips" };
    mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Array);
    mDrawerList.setAdapter(mAdapter);

    mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            switch (position){
                case 0:
                    startActivity(new Intent(getBaseContext(), DriverDetails.class));
                    break;
                case 1:
                    startActivity(new Intent(getBaseContext(), MapsActivity.class));
                    break;
                case 2:
                    Toast.makeText(MainActivity.this, "Contact", Toast.LENGTH_SHORT).show();
                    break;
                case 3:
                    Toast.makeText(MainActivity.this, "Report Driver", Toast.LENGTH_SHORT).show();
                    break;
                case 4:
                    Toast.makeText(MainActivity.this, "Call for Emergency", Toast.LENGTH_SHORT).show();
                    break;
                case 5:
                    Toast.makeText(MainActivity.this, "Rate Taxi", Toast.LENGTH_SHORT).show();
                    break;
                case 6:
                    Toast.makeText(MainActivity.this, "Favorites", Toast.LENGTH_SHORT).show();
                    break;
                case 7:
                    Toast.makeText(MainActivity.this, "Top Drivers", Toast.LENGTH_SHORT).show();
                    break;
                case 8:
                    Toast.makeText(MainActivity.this, "Security Tips", Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    });
}

private void setupDrawer() {
    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close) {

        /** Called when a drawer has settled in a completely open state. */
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            getSupportActionBar().setTitle("TaxiSafe");
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }

        /** Called when a drawer has settled in a completely closed state. */
        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            getSupportActionBar().setTitle(mActivityTitle);
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }
    };

    mDrawerToggle.setDrawerIndicatorEnabled(true);
    mDrawerLayout.setDrawerListener(mDrawerToggle);
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Sync the toggle state after onRestoreInstanceState has occurred.
    mDrawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    mDrawerToggle.onConfigurationChanged(newConfig);
}

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

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

    // Activate the navigation drawer toggle
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

MapsActivity.java

public class MapsActivity extends FragmentActivity {

private GoogleMap mMap; // Might be null if Google Play services APK is not available.

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


}

@Override
protected void onResume() {
    super.onResume();
    setUpMapIfNeeded();
}

private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();
        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            setUpMap();
        }
    }
}

private void setUpMap() {
    mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
}

activity_maps.xml

 <LinearLayout
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    xmlns:android="http://schemas.android.com/apk/res/android">

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="386dp"
    android:layout_height="573dp" android:id="@+id/map"
    tools:context="com.example.group.taxisafe.MapsActivity"
    android:name="com.google.android.gms.maps.SupportMapFragment" />
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<uses-sdk
    android:minSdkVersion="10"
    android:targetSdkVersion="19" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<!--
   The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
     Google Maps Android API v2, but are recommended.
-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/taxisafe"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".Login"
        android:label="TaxiSafe" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Register"
        android:label="@string/app_name" >
    </activity>
    <activity
        android:name=".Home"
        android:label="@string/title_activity_home" >
    </activity>
    <activity
        android:name=".DriverDetails"
        android:label="@string/title_activity_driver_details" >
    </activity>
    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >
    </activity>

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="@string/google_maps_key" />

    <activity
        android:name=".MapsActivity"
        android:label="@string/title_activity_maps" >
    </activity>
</application>

我在创建谷歌地图的单独项目中工作得很好。当我将它放入我的项目时，每次我在抽屉导航中选择轨道时，它总是停止。我不知道我的代码有什么问题或者我的代码缺少什么。

Answer 1

将您的 Mapfragemnt 扩展为 Fragemnt.. 而不是 FragmentActivity...

然后在您的主要 Activity 中，调用以下代码...

FragmentManager fragmentManager = getSupportFragmentManager();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.content_frame, MapActivity());
            fragmentTransaction.commit();

R.id.content_frame 是 MainActivity.xml 中的框架布局...

我不知道你给该框架布局的 id 是什么，因为你没有发布 MainActivity.xml