java - android - 动态添加按钮到自定义对话框

Question

我正在编写一个Android应用程序，我有一个 Activity ，里面有一个按钮，它在单击监听器上使用以下代码从自定义 XML 打开一个对话框:

我想向该对话框添加另一个未在其 XML 文件中设置的按钮。

所有组件都在 XML 中删除并且工作正常，对话框打开，但我无法添加 b 按钮。

this.addCheer.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final Dialog d = new Dialog(map.this);
                LinearLayout layout = findViewById(R.id.dialog_layout_root);
                LayoutInflater layoutInflater = d.getLayoutInflater();
                d.requestWindowFeature(Window.FEATURE_NO_TITLE);
                d.setContentView(R.layout.cheer_dialog);// custom layout for the dialog
                WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
                lp.copyFrom(d.getWindow().getAttributes());
                lp.width = WindowManager.LayoutParams.MATCH_PARENT;
                lp.height = WindowManager.LayoutParams.MATCH_PARENT;
                d.show();
                d.getWindow().setAttributes(lp);
                final EditText title = d.findViewById(R.id.cheerDialogText);

                ImageButton addCheerOk = (ImageButton) d.findViewById(R.id.addCheerOk);

                Button b = new Button(d.getContext());
                b.setText("yo");

                cheerDialogLayout.addView(b, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
}

我尝试使用 this例如，但它对我不起作用。我在这里做错了什么？谢谢!

Answer 1

试试下面的代码

this.addCheer.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final Dialog d = new Dialog(map.this);
                LayoutInflater layoutInflater = d.getLayoutInflater();
                d.requestWindowFeature(Window.FEATURE_NO_TITLE);
                d.setContentView(R.layout.cheer_dialog);// custom layout for the dialog

                WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
                lp.copyFrom(d.getWindow().getAttributes());
                lp.width = WindowManager.LayoutParams.MATCH_PARENT;
                lp.height = WindowManager.LayoutParams.MATCH_PARENT;
                d.show();
                d.getWindow().setAttributes(lp);

                LinearLayout layout = d.findViewById(R.id.dialog_layout_root);
                final EditText title = d.findViewById(R.id.cheerDialogText);

                ImageButton addCheerOk = (ImageButton) d.findViewById(R.id.addCheerOk);

                Button b = new Button(d.getContext());
                b.setText("yo");

                layout.addView(b, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
}

您仅使用 findViewById(R.id.dialog_layout_root); 而不是 d.findViewById(R.id.dialog_layout_root);