public class MainActivity extends Activity {

    EditText editText1, editText2, editText3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    //自定義View對話方塊
    public void customView(View source)
    {

        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this)
                .setIcon(R.mipmap.ic_launcher)
                .setTitle("自定義View對話方塊")
                .setView(R.layout.login)
                .setPositiveButton("確定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        if (TextUtils.isEmpty(editText1.getText().toString()) ||
                                TextUtils.isEmpty(editText2.getText().toString()) ||
                                TextUtils.isEmpty(editText3.getText().toString())) {
                            Toast.makeText(MainActivity.this, "請填寫完整", Toast.LENGTH_SHORT).show();
                           //不滿足條件，“確定”按鈕無效
                            try {
                                Field field = dialog.getClass().getSuperclass().getDeclaredField("mShowing");
                                field.setAccessible(true);
                                field.set(dialog, false);

                            } catch (Exception e) {
                                e.printStackTrace();
                            }

                        } else {
                            Log.d("acccc", editText1.getText().toString());
                            Log.d("acccc", editText2.getText().toString());
                            Log.d("acccc", editText2.getText().toString());
                        //滿足條件，點選“確定”後消失
                            try {
                                Field field = dialog.getClass().getSuperclass().getDeclaredField("mShowing");
                                field.setAccessible(true);
                                field.set(dialog, true);

                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                        }
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        try {
                            Field field = dialog.getClass().getSuperclass().getDeclaredField("mShowing");
                            field.setAccessible(true);
                            field.set(dialog, true);

                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                });

        AlertDialog dialog = builder.create();
        dialog.show();
        //以下三行必須放在dialog.show();下面
        editText1 = (EditText)dialog.findViewById(R.id.editText1);
        editText2 = (EditText)dialog.findViewById(R.id.editText2);
        editText3 = (EditText)dialog.findViewById(R.id.editText3);
    }
}
 

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <!-- 定義一個普通的按鈕元件 -->
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="自定義View對話方塊"
        android:onClick="customView"
        />
</LinearLayout>
 

login.xml

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:stretchColumns="1"
    android:id="@+id/loginLayout"
    >
    <TableRow>
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="使用者名稱:"
            />
        <EditText
            android:id="@+id/editText1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="請輸入登入賬號"
            android:selectAllOnFocus="true"
            />
    </TableRow>
    <TableRow>
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="密碼:"/>
        <EditText
            android:id="@+id/editText2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="請填寫密碼"
            android:password="true"
            />
    </TableRow>
    <TableRow>
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="電話號碼:"/>
        <EditText
            android:id="@+id/editText3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="請填寫您的電話號碼"
            android:password="true"
            />
    </TableRow>
</TableLayout>