requestLocationUpdates上的Android

Question

我在java.lang.AbstractMethoderRor:抽象方法“void android.location.locationListener.onProviderDisabled(java.lang.string)

当我调用locationmanager.requestLocationUpdates()时。我看到另一个帖子，答案是重写一些方法，即。

 @Override
public void onProviderDisabled(@NonNull String provider) {}

public class MainActivity extends AppCompatActivity {
    LocationManager locationManager;
    LocationListener  locationListener = location -> Toast.makeText(MainActivity.this,location.getLatitude()+" "+location.getLongitude(),Toast.LENGTH_LONG).show();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        findViewById(R.id.button).setOnClickListener(v -> showLoc());

        findViewById(R.id.button2).setOnClickListener(v -> locationManager.removeUpdates(locationListener));

    }
    private void showLoc(){
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 13);
            return;
        }
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 2, locationListener);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == 13) {
            for (int i = 0; i < permissions.length; i++) {
                if (permissions[i].equals(Manifest.permission.ACCESS_FINE_LOCATION) && grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                    System.out.println("DEBUG Request Permissions ");
                    showLoc();
                }
            }
        }
    }
}

异常在LocationManager.RequestLocationUpdates处引发，与库版本有关。

最后，这是我的建筑。gradle（应用程序）

plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    defaultConfig {
        applicationId "com.example.app"
        minSdkVersion 25
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

Answer 1

重写代码中的方法

...

override fun onProviderDisabled(provider: String) {}
override fun onProviderEnabled(provider: String) {}
override fun onStatusChanged(provider: String?, status: Int, extras: Bundle?) {}
...