Question

我一直在尝试这样做，以便我可以将用户输入的任何数据保存到自定义对话框的EditText中，但没有成功。该应用程序每次都会在具有getText()功能的行上崩溃。任何帮助将深表感谢。

public void comments(View v){

    AlertDialog.Builder builder2;

    builder2 = new AlertDialog.Builder(this);
    // Get the layout inflater
    LayoutInflater inflater = getLayoutInflater();

    builder2.setTitle("Recipe Comments");
    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    final View view = inflater.inflate(R.layout.fragment_comments, null);

    builder2.setView(view)
            // Add action buttons
            .setPositiveButton("Save", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    // sign in the user ...
                    EditText text = (EditText)view.findViewById(R.id.comments);
                    String temp = text.getText().toString();
                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //LoginDialogFragment.this.getDialog().cancel();
                }
            });
    builder2.create();
    builder2.show();
}

这是StackTraces：

08-22 23：43：38.111 10837-10897 / com.example.wesle.wsuuioption1 I / OpenGLRenderer：初始化的EGL，版本1.4 08-22 23：43：43.568 10837-10837 / com.example.wesle.wsuuioption1 D / AndroidRuntime：关闭VM 08-22 23：43：43.571 10837-10837 / com.example.wesle.wsuuioption1 E / AndroidRuntime：FATAL EXCEPTION：main 处理：com.example.wesle.wsuuioption1，PID：10837 java.lang.NullPointerException：尝试调用虚方法 'android.text.Editable android.widget.EditText.getText（）'上的null 对象参考在 com.example.wesle.wsuuioption1.MainActivity $ 7.onClick（MainActivity.java:2936）在 android.support.v7.app.AlertController $ ButtonHandler.handleMessage（AlertController.java:157）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5417） at java.lang.reflect.Method.invoke（Native Method）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）

Answer 1

在设置视图之前建立连接，并将其设为最终。

public void comments(View v){

    AlertDialog.Builder builder2;

    builder2 = new AlertDialog.Builder(this);
    // Get the layout inflater
    LayoutInflater inflater = getLayoutInflater();

    builder2.setTitle("Recipe Comments");
    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    final View view = inflater.inflate(R.layout.fragment_comments, null);

    // Make connection her before setting view.
    final EditText text = (EditText)view.findViewById(R.id.comments);

    builder2.setView(view)
            // Add action buttons
            .setPositiveButton("Save", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    // sign in the user ...
                    //EditText text = (EditText)view.findViewById(R.id.comments);
                    String temp = text.getText().toString();
                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //LoginDialogFragment.this.getDialog().cancel();
                }
            });
    builder2.create();
    builder2.show();
}

Answer 2

您无法通过views获取组件。只需从DialogInterface object

获取

    public void comments(View v){

    AlertDialog.Builder builder2;

    builder2 = new AlertDialog.Builder(this);
    // Get the layout inflater
    LayoutInflater inflater = getLayoutInflater();

    builder2.setTitle("Recipe Comments");
    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    final View view = inflater.inflate(R.layout.fragment_comments, null);


    builder2.setView(view)
            // Add action buttons
            .setPositiveButton("Save", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    // sign in the user ...
                    EditText text = (EditText)dialog.findViewById(R.id.comments);
                    String temp = text.getText().toString();
                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //LoginDialogFragment.this.getDialog().cancel();
                }
            });
    builder2.create();
    builder2.show();
}

自定义对话框中的getText

2 个答案: