Android中AlertDialog等的使用

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package com.example.administrator.imooc;import android.app.DatePickerDialog;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.Button;import android.widget.DatePicker;import android.widget.Toast;import java.util.Calendar;/** 这个代码是主要学习了三个dialog的使用，以后不会的时候回来看。*/public class MainActivity extends AppCompatActivity implements View.OnClickListener{    private Button setDate,single,muti;    private AlertDialog alertDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.layout);        init();    }    public  void init(){        setDate=(Button) findViewById(R.id.btn_setting);        single=(Button) findViewById(R.id.btn_single);        muti=(Button) findViewById(R.id.btn_muti);        setDate.setOnClickListener(this);        single.setOnClickListener(this);        muti.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.btn_setting://设置日期              showDatePickerDialog();                break;            case R.id.btn_single://设置单选               showSingleListDialog();                break;            case R.id.btn_muti://设置多选               showMutiListDialog();                break;        }    }    public void showDatePickerDialog(){        Calendar c=Calendar.getInstance();        /*datepicker的参数*/        new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {            @Override            public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {                Toast.makeText(MainActivity.this,"日期为："+                        year+"年"+(month+1)+"月"+(dayOfMonth)+"日",Toast.LENGTH_SHORT).show();            }        },c.get(Calendar.YEAR),c.get(Calendar.MONTH),c.get(Calendar.DAY_OF_MONTH)).show();    }    public void showSingleListDialog(){        AlertDialog.Builder builder=new AlertDialog.Builder(this);        builder.setTitle("性别选择");        builder.setIcon(android.R.drawable.btn_star);        final String[] sex=getResources().getStringArray(R.array.sex);        //setSingleChoiceItems(数据资源id,表示默认被选中的item的下标 －1不存在默认选中，        // 点击单选item的点击事件)        builder.setSingleChoiceItems(R.array.sex, -1, new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                /*toast的时候千万别忘了最后的show*/                Toast.makeText(MainActivity.this,"您的性别是："+sex[which],Toast.LENGTH_SHORT).show();                dialog.dismiss();            }        });        /*一定要写这一句不然前面的都是白写*/        builder.create().show();    }    public void showMutiListDialog(){        AlertDialog.Builder builder=new AlertDialog.Builder(this);        builder.setTitle("选择你的爱好");        builder.setIcon(android.R.drawable.btn_star);        final String[] loves=getResources().getStringArray(R.array.loves);//获取爱好的列表        final boolean[] checkedItems=new boolean[loves.length];        //setMultiChoiceItems(数据元的资源id,boolean类型数组 默认被选中 true选中 false未选中         builder.setMultiChoiceItems(R.array.loves, checkedItems,                 new DialogInterface.OnMultiChoiceClickListener() {             @Override             public void onClick(DialogInterface dialog, int which, boolean isChecked) {                 checkedItems[which]=isChecked;                // Toast.makeText(MainActivity.this,"您的爱好是："+loves[which],Toast.LENGTH_SHORT).show();             }         });        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {            @Override            /*因为有多个选项，所以通过一个列表把所有的选项都存起来，最后输出*/            public void onClick(DialogInterface dialog, int which) {                StringBuilder sb=new StringBuilder();                for(int i=0;i<checkedItems.length;i++){                    if(checkedItems[i]){                        sb.append(loves[i]);                        sb.append("\n");                    }                }                Toast.makeText(MainActivity.this,"您的爱好是："+sb.toString(),Toast.LENGTH_SHORT).show();            }        });        builder.create().show();    }}
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