Android 从自定义对话框获取文本

我一直在尝试将用户输入的任何数据保存到自定义对话框的

EditText

，但没有成功。应用程序每次在具有

getText（）

函数的行上都会崩溃。任何帮助都将不胜感激

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();
}

以下是我的建议：

08-22 23:43:38.111 10837-10897/com.example.wesle.wsuioption 1 I/OpenGLRenderer:初始化EGL，版本1.4 08-22 23:43:43.568 10837-10837/com.example.wesle.wsuuioption1 D/AndroidRuntime:关闭虚拟机 08-22 23:43:43.571 10837-10837/com.example.wesle.wsuuioption1 E/AndroidRuntime:致命异常：main 进程：com.example.wesle.wsuuioption1，PID:10837 java.lang.NullPointerException:尝试调用虚拟方法 空值上的“android.text.Editable android.widget.EditText.getText（）” 对象引用 在 com.example.wesle.wsuuioption1.MainActivity$7.onClick（MainActivity.java:2936） 在 android.support.v7.app.AlertController$ButtonHandler.handleMessage（AlertController.java:157） 位于android.os.Handler.dispatchMessage（Handler.java:102） 位于android.os.Looper.loop（Looper.java:148） 位于android.app.ActivityThread.main（ActivityThread.java:5417） 位于java.lang.reflect.Method.invoke（本机方法） 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:726） 位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）

---

在设置视图之前连接她，并使其成为最终视图

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();
}

---

您无法通过

视图

获取组件。只需从

对话框界面

对象

    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();
}

---

发布你的日志，这样人们就可以发现你犯了什么错误……刚刚发布，谢谢。请检查你的

R.layout.fragment\u comments

edittext的id是

comments

，或者发布你的xml文件是你的

R.id.comments

属于

R.layout.fragment\u comments

，修复了它。谢谢那零钱还砸在我身上