AlertDialog选择对话框

转载请注明出处：http://blog.csdn.net/mr_leixiansheng/article/details/53559605

区别：不用在xml定义，直接在活动中使用

package com.example.administrator.alertdialog;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        //实例化一个 AlertDialog.Builder
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        //设置标题、内容、返回键是否退出、按键响应
        builder.setTitle("对话选择框");
        builder.setMessage("这是一个对话框，请进行选择");
        builder.setCancelable(false);

        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(MainActivity.this, "你点击了OK", Toast.LENGTH_SHORT).show();
            }
        });
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                finish();
            }
        });
        //必须显示出来
        builder.show();
    }

    private void showProgressDialog () {
        ProgressDialog dialog = new ProgressDialog(this);
        dialog.setTitle("title");
        dialog.setMessage("loading...");
        dialog.setCancelable(true);
        dialog.show();
    }
}

 

Kotlin写法:

package com.leixiansheng.kotlintest

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v7.app.AlertDialog
import android.widget.Toast

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val builder = AlertDialog.Builder(this)
        builder.setTitle("对话选择框")
                .setMessage("这是一个对话框，请进行选择")
                .setCancelable(false)
                //简写
                .setPositiveButton("OK", { dialog, which -> Toast.makeText(this, "你点击了OK", Toast.LENGTH_SHORT).show(); })
                .setNegativeButton("Cancel", { dialog, which ->  finish() })
                //完整写法
//                .setPositiveButton("OK", DialogInterface.OnClickListener {
//                    dialog, which -> Toast.makeText(this, "你点击了OK", Toast.LENGTH_SHORT).show();
//                })
//                .setNegativeButton("Cancel", DialogInterface.OnClickListener {
//                    dialog, which ->  finish()
//                })
                .show()
    }
}