Question

我收到了错误

'不兼容的类型必需：android.widget.Button 发现：android.view.View'

现在班级出现了错误......

他们说我将重命名该文件，但我的代码中也有一个MapsActivity

这是我的代码：

public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback {

    private GoogleMap mMap;

    @Override
    protected void onCreate(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(map);
        mapFragment.getMapAsync(this);

        final Toolbar customToolbar = (Toolbar) findViewById(R.id.toolbar);
        customToolbar.setTitle("Hello");
        getSupportActionBar().setTitle("Titeltest");

        getSupportActionBar().setDisplayShowTitleEnabled(false);
        TextView mTitle = (TextView) customToolbar.findViewById(R.id.toolbar_title);


    }

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

        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
        mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);

    }

}
public class ButtonClass extends Activity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_maps);

        final Button button = (Button) findViewById(R.id.addbutton);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                //Insert Action if clicking on button here
            }
        });
    }
}

Answer 1

您必须将视图转换为按钮：

final Button button = (Button) findViewById(R.id.addbutton);

编辑：

public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback {

    private GoogleMap mMap;

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

        final Button button = (Button) findViewById(R.id.addbutton);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                //Insert Action if clicking on button here
            }
        });
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(map);
        mapFragment.getMapAsync(this);

        final Toolbar customToolbar = (Toolbar) findViewById(R.id.toolbar);
        customToolbar.setTitle("Hello");
        getSupportActionBar().setTitle("Titeltest");

        getSupportActionBar().setDisplayShowTitleEnabled(false);
        TextView mTitle = (TextView) customToolbar.findViewById(R.id.toolbar_title);


    }

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

        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
        mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);

    }

}

添加按钮时不兼容的类型

1 个答案: