android - 如何使用 Intent 启动 Google Map Activity

Question

我创建了 Activity :MapsActivity，它在 map 上显示了我的位置。

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

private GoogleMap mMap;
private LocationManager locationManager;


@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
}


@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Criteria criteria = new Criteria();
    Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
    double lat = location.getLatitude();
    double lng = location.getLongitude();

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

        return;
    }
    mMap.setMyLocationEnabled(true);
    // Add a marker in Sydney and move the camera
    LatLng place = new LatLng(lat,lng);
    mMap.addMarker(new MarkerOptions().position(place).title("Marker in Sydney"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(place));
}
}

我创建了 MainActivity，带有一个按钮，我想点击它以移动到 MapsActivity，这里是代码:

public class MainActivity extends AppCompatActivity {

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

public void showMyLocation(View view){
    Intent intentControls = new Intent(this, MapsActivity.class);
    startActivity(intentControls);
}
}

Gradle

    android {
    compileSdkVersion 27
    buildToolsVersion "27.0.1"
    defaultConfig {
        applicationId "com.example.lukasz.aaaaa"
        minSdkVersion 21
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    compile 'com.android.support:appcompat-v7:26.0.0-alpha1'
    compile 'com.google.android.gms:play-services-maps:10.2.6'
    compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha8'
    testCompile 'junit:junit:4.12'
}

AndroidManifest

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.lukasz.aaaaa">
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />

    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="@string/google_maps_key" />

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

    <activity android:name=".MainActivity"
              android:label="Mapy">>
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

</application>

问题是，在我单击 MainActivity 中的按钮后，应用程序崩溃并显示

FATAL EXCEPTION: main Process: com.example.lukasz.aaaaa, PID: 2433 java.lang.IllegalArgumentException: invalid provider: null at android.location.LocationManager.checkProvider(LocationManager.java:2099) at android.location.LocationManager.getLastKnownLocation(LocationManager.java:1200) at com.example.lukasz.aaaaa.MapsActivity.onMapReady(MapsActivity.java:56) at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source:7) at com.google.android.gms.maps.internal.zzt$zza.onTransact(Unknown Source:30) at android.os.Binder.transact(Binder.java:627) at gl.b(:com.google.android.gms.DynamiteModulesB@11577470:20) at com.google.android.gms.maps.internal.bf.a(:com.google.android.gms.DynamiteModulesB@11577470:5) at com.google.maps.api.android.lib6.impl.bc.run(:com.google.android.gms.DynamiteModulesB@11577470:5) at android.os.Handler.handleCallback(Handler.java:790) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)r

我的问题是如何使用 Intent 从另一个 Activity 运行 Google Map Activity？

Answer 1

保持低于许可高于应用标签

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
        <uses-permission android:name="android.permission.INTERNET" />
     <application
          ......
          .....
    <activity>

          .....
   </activity>

</application>

(或)

You are getting this error most probably, due to un-availability of GPS Providers. Please ask the person to check settings if Gps Provider or Network Provider has been enabled into Location settings.