Question

我在Dialog类中有以下代码：

public Dialog onCreateDialog(Bundle savedInstanceState) {
    final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle("MyTitle")
            .setMessage("MyMessage")
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                      /////////LINE OF MY QUESTION/////////////////////
                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                }
            });
    return builder.create();
}

，我需要在MainActivity“确定”按钮（OnClickListener for）内从另一个类（///LINE OF MY QUESTION///）调用方法“ OK_Clicked”。我已经尝试过：

MainActivity xyz = new MainActivity();
xyz.OK_Clicked();

但是每次我单击“确定”按钮时，应用程序都会崩溃并说：“ MyApp已停止。”

Answer 1

在需要的地方定义DialogInterface.OnClickListener（例如，将其分配给类级变量），然后创建一个方法从类外部调用onClick方法。

//Just take your existing anonymous subclass definitions and put them here
private DialogInterface.OnClickListener listener1 = new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                }
            };
private DialogInterface.OnClickListener listener2 = new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                }
            }

public Dialog onCreateDialog(Bundle savedInstanceState) {
    final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle("MyTitle")
            .setMessage("MyMessage")
            .setPositiveButton("OK", listener1)
            .setNegativeButton("Cancel", listener2);
    return builder.create();
}

// Call these methods from outside this class
public void onClick1(){
    listener1.onClick();
}

public void onClick2(){
    listener2.onClick();
}

当按下弹出窗口中的按钮时，从另一个类调用方法

1 个答案: