Question

我的问题如下：

当我点击ActionBar中的按钮时，它会进入错误的活动状态。当我处于错误的活动并按下后退按钮时。这是它应该去的那个。

当按下按钮时，它应该转到AddActivity。

如果要求任何其他代码，请询问。

MapsActivity

public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {

    private GoogleMap mMap;
    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;
    private Location mLastLocation;
    private Marker mCurrLocationMarker;

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

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            checkLocationPermission();
        }

        // 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);

        initialize();

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_add_marker:
                // User chose the "Add marker" item
                Intent addActivityIntent = new Intent(MapsActivity.this, AddActivity.class);
                startActivity(addActivityIntent);
            case R.id.action_logout:
                // User chose the "Uitloggen" item
                PokeMapperModel.getInstance().setCurrentUser(null);
                Intent loginActivityIntent = new Intent(MapsActivity.this, LoginActivity.class);
                startActivity(loginActivityIntent);
                finish();
            default:
                // Action not recognized
                return super.onOptionsItemSelected(item);
        }
    }

    private boolean isUserLoggedIn() {
        return PokeMapperModel.getInstance().getCurrentUser() != null;
    }

    private void initialize() {
        if (!isUserLoggedIn()) {
            Intent intent = new Intent(MapsActivity.this, LoginActivity.class);
            startActivity(intent);
            finish();
        }
    }

Answer 1

您忘记在每个switch语句后添加break;。

编辑：您不需要添加default:，请查看更新后的代码。

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_add_marker:
                // User chose the "Add marker" item
                Intent addActivityIntent = new Intent(MapsActivity.this, AddActivity.class);
                startActivity(addActivityIntent);
                break;
            case R.id.action_logout:
                // User chose the "Uitloggen" item
                PokeMapperModel.getInstance().setCurrentUser(null);
                Intent loginActivityIntent = new Intent(MapsActivity.this, LoginActivity.class);
                startActivity(loginActivityIntent);
                finish();
                break;
        }
        return super.onOptionsItemSelected(item);
    }

Answer 2

您需要return true;

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.one:
            one();
            return true;
        case R.id.two:
            two();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

应用程序错误的活动。而后退按钮则向右移动

2 个答案: