Question

我有一个活动，提示一个对话框片段。当对话框片段被关闭时，我想在父活动中调用一个方法。这是包含对话框片段的活动。

public class HomScr extends AppCompatActivity {
TextView tv;

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

        initialize();
    }

    private void initialize(){

        tv = findViewById(R.id.tv);
        Button btn = findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ProEdiCon dia_fra = new ProEdiCon();
                dia_fra.show((this).getSupportFragmentManager(), "pro_edi_con");
            }
        }
    }


    private void method_to_run_onDismiss(){
        tv.setText("method to run is executed");
        Toast.makeText(this, "method to run successfully executed on dismiss Dialog Fragment", Toast.LENGTH_SHORT).show();
    }
}

下面的代码是DialogFragment，它在某些时候被关闭，然后父活动必须调用该方法以在关闭时运行。

public class ProEdiCon extends DialogFragment {
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle bun) {
        View pro_vie = inflater.inflate(R.layout.pro_edi_dat, container, false);

        TextView tv = pro_vie.findViewById(R.id.tv);
        tv.setText("I am the Dialog Fragment who is gonna be dismissed soon");

        Button btn = pro_vie.findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dismiss();
            }
        }

        return pro_vie;
    }
}

那么有人可以帮我吗？

Answer 1

您可以使用Dialog并设置“关闭监听器”，并在对话框关闭时监听事件

btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ProEdiCon dia_fra = new ProEdiCon();
                dia_fra.show();
                dia_fra.setOnDismissListener(new DialogInterface.OnDismissListener() {
                    @Override
                    public void onDismiss(DialogInterface dialogInterface) {
                        //do some action here
                    }
                });
            }
        }

，您的对话框将如下所示：

public class ProEdiCon extends Dialog {

    public ProEdiCon (@NonNull Context context) {
        super(context);
    }

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

        TextView tv = pro_vie.findViewById(R.id.tv);
        tv.setText("I am the Dialog Fragment who is gonna be dismissed soon");

        Button btn = pro_vie.findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dismiss();
            }
        });
    }
}

Answer 2

您必须创建这样的界面

CallBackListener.java

public interface CallBackListener {
     void onDismiss();
}

然后在您的片段中

public class ProEdiCon extends DialogFragment {

private CallBackListener callBackListener;
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    //getActivity() is fully created in onActivityCreated and instanceOf differentiate it between different Activities
    if (getActivity() instanceof CallBackListener)
        callBackListener = (CallBackListener) getActivity();
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle bun) {
    View pro_vie = inflater.inflate(R.layout.pro_edi_dat, container, false);

    TextView tv = pro_vie.findViewById(R.id.tv);
    tv.setText("I am the Dialog Fragment who is gonna be dismissed soon");

    Button btn = pro_vie.findViewById(R.id.btn);

    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(callBackListener != null)
                callBackListener.onDismiss();
            dismiss();
        }
    }

    return pro_vie;
}
}

最后在您的活动中

public class HomScr extends AppCompatActivity implements CallBackListener {
    TextView tv;

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

    initialize();
}

private void initialize(){

    tv = findViewById(R.id.tv);
    Button btn = findViewById(R.id.btn);

    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            ProEdiCon dia_fra = new ProEdiCon();
            dia_fra.show((this).getSupportFragmentManager(), "pro_edi_con");
        }
    }
}


private void method_to_run_onDismiss(){
    tv.setText("method to run is executed");
    Toast.makeText(this, "method to run successfully executed on dismiss Dialog Fragment", Toast.LENGTH_SHORT).show();
}

@Override
public void onDismiss() {
    method_to_run_onDismiss();
}

}

Answer 3

您可能想在Dialog类中使用DialogListener接口，并在关闭对话框之前调用它。

与方法的接口

public interface MyInterface {
    void method_to_run_onDismiss();
}

对话框-创建接口的实例并在dismiss();

之前调用它

public class ProEdiCon extends DialogFragment {

private MyInterface myInterface;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle bun) {
       ...
        myInterface = (MyInterface) context;
        Button btn = pro_vie.findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            myInterface.method_to_run_onDismiss();
                dismiss();
            }
        }

        return pro_vie;
    }
}

活动类实现接口并使用您已有的方法

Public class HomScr extends AppCompatActivity implements MyInterface {
TextView tv;

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

        initialize();
    }

    private void initialize(){

        tv = findViewById(R.id.tv);
        Button btn = findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ProEdiCon dia_fra = new ProEdiCon();
                dia_fra.show((this).getSupportFragmentManager(), "pro_edi_con");
            }
        }
    }


    private void method_to_run_onDismiss(){
        tv.setText("method to run is executed");
        Toast.makeText(this, "method to run successfully executed on dismiss Dialog Fragment", Toast.LENGTH_SHORT).show();
    }
}

取消对话框片段后，在父活动中调用方法

3 个答案: