上效果图
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="单选对话框"
android:textSize="20sp"
android:layout_marginTop="30dp"
android:gravity="center"
android:id="@+id/tv"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="设置字体大小"
android:id="@+id/btn"
android:layout_marginTop="20dp"
android:layout_gravity="center"
/>
</LinearLayout>
MainActivity.java
package com.example.singlechoicedialog;
import androidx.appcompat.app.AppCompatActivity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private AlertDialog dialog;
private TextView textView;
private int[] textSizeArr = {10,20,25,30,40};
private String[] fontStyleArr= {"小号","默认","中号","大号","超大"};
int textSize = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btn).setOnClickListener(this);
textView = (TextView) findViewById(R.id.tv);
}
@Override
public void onClick(View view) {
AlertDialog.Builder builder = new AlertDialog.Builder(this)
.setTitle("设置字体的大小")
.setIcon(R.drawable.bdd)
.setSingleChoiceItems(fontStyleArr, textSize, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
textSize=i;
}
})
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
textView.setTextSize(textSizeArr[textSize]);
dialog.dismiss();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialog.dismiss();
}
});
dialog = builder.create();
dialog.show();
}
}