如何以编程方式使用默认 AlertDialog 添加 TextView 和 EditText

Question

我一直在尝试在默认的 AlertDialog 中添加两个元素，但我似乎无法让它工作。这是我的代码：

// START Dialog
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);

    TextView tv = new TextView(this);
    tv.setText(title);
    tv.setPadding(40, 40, 40, 40);
    tv.setGravity(Gravity.CENTER);
    tv.setTextSize(20);

    EditText et = new EditText(this);
    etStr = et.getText().toString();

    alertDialogBuilder.setView(et);
    alertDialogBuilder.setTitle(title);
    alertDialogBuilder.setMessage("Input Student ID");
    alertDialogBuilder.setCustomTitle(tv);

    if (isError)
        alertDialogBuilder.setIcon(R.drawable.icon_warning);
    // alertDialogBuilder.setMessage(message);
    alertDialogBuilder.setCancelable(false);

    // Setting Negative "Cancel" Button
    alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            dialog.cancel();
        }
    });

    // Setting Positive "Yes" Button
    alertDialogBuilder.setPositiveButton("OK",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    if (isError)
                        finish();
                    else {
                        Intent intent = new Intent(
                                ChangeDeviceActivity.this,
                                MyPageActivity.class);
                        startActivity(intent);
                    }
                }
            });

    AlertDialog alertDialog = alertDialogBuilder.create();

    try {
        alertDialog.show();
    } catch (Exception e) {
        // WindowManager$BadTokenException will be caught and the app would
        // not display the 'Force Close' message
        e.printStackTrace();
    }

目前，这只是一个EditText，其中包含由alertDialogBuilder.setMessage("Input Student ID"); 设置的消息，但我想将此设置为TextView，以便我可以居中对齐它。我该怎么做？

Answer 1

        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);

        LinearLayout layout = new LinearLayout(this);
        LinearLayout.LayoutParams parms = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        layout.setOrientation(LinearLayout.VERTICAL);
        layout.setLayoutParams(parms);

        layout.setGravity(Gravity.CLIP_VERTICAL);
        layout.setPadding(2, 2, 2, 2);

        TextView tv = new TextView(this);
        tv.setText("Text View title");
        tv.setPadding(40, 40, 40, 40);
        tv.setGravity(Gravity.CENTER);
        tv.setTextSize(20);

        EditText et = new EditText(this);
        etStr = et.getText().toString();
        TextView tv1 = new TextView(this);
        tv1.setText("Input Student ID");

        LinearLayout.LayoutParams tv1Params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        tv1Params.bottomMargin = 5;
        layout.addView(tv1,tv1Params);
        layout.addView(et, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

        alertDialogBuilder.setView(layout);
        alertDialogBuilder.setTitle(title);
        // alertDialogBuilder.setMessage("Input Student ID");
        alertDialogBuilder.setCustomTitle(tv);

        if (isError)
            alertDialogBuilder.setIcon(R.drawable.icon_warning);
        // alertDialogBuilder.setMessage(message);
        alertDialogBuilder.setCancelable(false);

        // Setting Negative "Cancel" Button
        alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                dialog.cancel();
            }
        });

        // Setting Positive "OK" Button
        alertDialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                if (isError)
                    finish();
                else {
                      Intent intent = new Intent(ChangeDeviceActivity.this,
                      MyPageActivity.class); startActivity(intent);
                }
            }
        });

        AlertDialog alertDialog = alertDialogBuilder.create();

        try {
            alertDialog.show();
        } catch (Exception e) {
            // WindowManager$BadTokenException will be caught and the app would
            // not display the 'Force Close' message
            e.printStackTrace();
        }

Answer 2

制作一个 .xml 文件，其中包含您想要的任何视图，如下所示。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:orientation="vertical">

<TextView
        android:id="@+id/textView1"
        android:layout_width="312dp"
        android:layout_height="wrap_content"
        android:text="Enter your email address :"
        android:layout_marginLeft="5dp"
        android:textAppearance="?android:attr/textAppearanceSmall"/>

<EditText
        android:id="@+id/dialog1Edittext"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:layout_marginTop="10dp"
        android:inputType="textEmailAddress">

    <requestFocus/>
</EditText>

之后在您的 .java 文件中实现以下代码。

View view = View.inflate(this, R.layout.yourxmlname, null);
AlertDialog.Builder alert = new AlertDialog.Builder(this);
// Now set the dialog's content
alert.setContentView(view);

希望对你有所帮助。

Answer 3

当调用setView() 时，原来的TextView 会隐藏消息。 你需要

• 创建一个小的布局 xml 并将 EditText 和 TextView 放入其中
• 扩展布局
• 使用findViewById() 获取视图的引用
• 对视图做点什么