java - 错误错误：方法没有覆盖或实现超类型中的方法

Question

我想在我的项目中导入 Google Map sdk。当我编写代码时，除了这个错误（错误：方法没有覆盖或实现超类型的方法）之外，一切都很好。

我搜索了很多，但没有什么足以摆脱这个错误。

这是我的主要活动，名为（GoogleMap.java）

 public class GoogleMap extends AppCompatActivity {
//map data
private static final String TAG = "HomeActivity";
private static final int ERROR_DIALOG_REQUEST = 9001;


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

    //map data
    if (isServicesOK()) {
        init();
    }
}
//MAP DATA
public void init() {
    Button btnMap = (Button) findViewById(R.id.btnMap);
    btnMap.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(GoogleMap.this, MapActivity.class);
            startActivity(intent);
        }
    });

}

public boolean isServicesOK() {
    Log.d(TAG, "isServicesOK: checking google services version");
    int available = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(GoogleMap.this);
    if (available == ConnectionResult.SUCCESS) {
        Log.d(TAG, "Google Play Services is Working");
        return true;
    } else if (GoogleApiAvailability.getInstance().isUserResolvableError(available)) {
        //an error occured but we can resolve it
        Log.d(TAG, "isServicesOK: an error occured but we can fix it");
        Dialog dialog =  GoogleApiAvailability.getInstance().getErrorDialog(GoogleMap.this, available, ERROR_DIALOG_REQUEST);
        dialog.show();
    } else {
        Toast.makeText(this, "you can,t make map request",  Toast.LENGTH_LONG).show();

    }
    return false;
}
 }

这是我的第二个活动，名为（MapActivity.java）

 public abstract class MapActivity extends AppCompatActivity implements OnMapReadyCallback{

@Override
public void onMapReady(GoogleMap googleMap) {
    Toast.makeText(this, "Map is Ready", Toast.LENGTH_SHORT).show();
    Log.d(TAG, "onMapReady: map is ready");
    mMap = googleMap;
}

private static final String TAG = "MapActivity";

private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
private static final String COURSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;

//vars
private Boolean mLocationPermissionsGranted = false;
private GoogleMap mMap;

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

    getLocationPermission();
}

private void initMap(){
    Log.d(TAG, "initMap: initializing map");
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);

    mapFragment.getMapAsync(MapActivity.this);
}

private void getLocationPermission(){
    Log.d(TAG, "getLocationPermission: getting location permissions");
    String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION,
            Manifest.permission.ACCESS_COARSE_LOCATION};

    if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
            FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
        if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
                COURSE_LOCATION) == PackageManager.PERMISSION_GRANTED){
            mLocationPermissionsGranted = true;
        }else{
            ActivityCompat.requestPermissions(this,
                    permissions,
                    LOCATION_PERMISSION_REQUEST_CODE);
        }
    }else{
        ActivityCompat.requestPermissions(this,
                permissions,
                LOCATION_PERMISSION_REQUEST_CODE);
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    Log.d(TAG, "onRequestPermissionsResult: called.");
    mLocationPermissionsGranted = false;

    switch(requestCode){
        case LOCATION_PERMISSION_REQUEST_CODE:{
            if(grantResults.length > 0){
                for(int i = 0; i < grantResults.length; i++){
                    if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
                        mLocationPermissionsGranted = false;
                        Log.d(TAG, "onRequestPermissionsResult: permission failed");
                        return;
                    }
                }
                Log.d(TAG, "onRequestPermissionsResult: permission granted");
                mLocationPermissionsGranted = true;
                //initialize our map
                initMap();
            }
        }
    }
}


}

我认为问题出在这个代码块中。（红线显示在@override这个词下）

  @Override
public void onMapReady(GoogleMap googleMap) {
    Toast.makeText(this, "Map is Ready", Toast.LENGTH_SHORT).show();
    Log.d(TAG, "onMapReady: map is ready");
    mMap = googleMap;
}

这是我的构建失败的堆栈跟踪：

 org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:compileDebugJavaWithJavac'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:95)
at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:91)
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:57)

Caused by: org.gradle.api.internal.tasks.compile.CompilationFailedException: Compilation failed; see the compiler error output for details.
at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:52)
at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:36)

这是java编译器失败的堆栈跟踪：

 error: method does not override or implement a method from a supertype

我怎样才能摆脱这个错误？

标签： javaandroidgoogle-maps-android-api-2