Android Studio 复选框

Question

我正在寻求有关此错误的帮助：

error: incompatible types: no unique maximal instance exists for type variable T with upper bounds CheckBox,View where T is a type-variable: T extends View declared in method findViewById(int)

...当 运行 此代码时我得到：

public class CheckBox extends AppCompatActivity {

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

        CheckBox checkbox1 = new CheckBox();
        checkbox1 = findViewById(R.id.bx1);
    }
}

Answer 1

您需要勾选复选框，因为返回的表单 findViewById 是通用的

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

    CheckBox checkbox1 = (Checkbox) findViewById(R.id.bx1);
}