AlterDialog對話框的使用

第一步先寫出layout文件

 

 

<?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/tv"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:gravity="center"
       android:text="單選對話框"
       android:layout_marginTop="10dp"
       android:textSize="20sp"
       android:textColor="#fffdb371"/>

    <Button
        android:id="@+id/bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="設置字體大小"
        android:layout_marginTop="20dp"
        android:layout_gravity="center"/>


</LinearLayout>

第二步寫MainActity

 

 

package com.iang.dialongdemo;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {


    private TextView textView;
    private int[] textSizeArr={10,20,25,30,40};
    int textSize=1;
//    加載資源文件，找到資源文件中的按鈕id號
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.linear);
        findViewById(R.id.bt).setOnClickListener(this);
        textView=(TextView) findViewById(R.id.tv);
    }

    @Override
    public void onClick(View v) {
        AlertDialog dialog;
        AlertDialog.Builder builder=new AlertDialog.Builder(this)
                .setTitle("設置字體大小")
                .setIcon(R.mipmap.ic_launcher)
                .setSingleChoiceItems(new String[]{"小號", "默認", "中號", "大號", "超大"}, textSize, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        textSize=which;
                    }
                })
                .setPositiveButton("確定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        textView.setTextSize(textSizeArr[textSize]);
                        dialog.dismiss();
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        dialog = builder.create();
        dialog.show();
    }
//   回退程序的使用
    @Override
    public void onBackPressed() {
       // super.onBackPressed();
        AlertDialog dialog;
        AlertDialog.Builder builder =new AlertDialog.Builder(this)
                .setTitle("普通對話框")    //設置對話框的標題
                .setIcon(R.mipmap.ic_launcher)   //設置標題圖標
                .setMessage("是否確定退出應用:")
                .setPositiveButton("確定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        MainActivity.this.finish();
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        dialog = builder.create();
        dialog.show();
    }
}

 第三步完成