4.19

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn_dialog_one;
    private Button btn_dialog_two;
    private Button btn_dialog_three;
    private Button btn_dialog_four;

    private Context mContext;
    private boolean[] checkItems;

    private AlertDialog alert = null;
    private AlertDialog.Builder builder = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = MainActivity.this;
        bindView();


    }

    private void bindView() {
        btn_dialog_one = (Button) findViewById(R.id.btn_dialog_one);
        btn_dialog_two = (Button) findViewById(R.id.btn_dialog_two);
        btn_dialog_three = (Button) findViewById(R.id.btn_dialog_three);
        btn_dialog_four = (Button) findViewById(R.id.btn_dialog_four);
        btn_dialog_one.setOnClickListener(this);
        btn_dialog_two.setOnClickListener(this);
        btn_dialog_three.setOnClickListener(this);
        btn_dialog_four.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            //普通对话框
            case R.id.btn_dialog_one:
                alert = null;
                builder = new AlertDialog.Builder(mContext);
                alert = builder.setIcon(R.mipmap.ic_icon_fish)
                        .setTitle("系统提示：")
                        .setMessage("这是一个最普通的AlertDialog,
带有三个按钮，分别是取消，中立和确定")
                        .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(mContext, "你点击了取消按钮~", Toast.LENGTH_SHORT).show();
                            }
                        })
                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(mContext, "你点击了确定按钮~", Toast.LENGTH_SHORT).show();
                            }
                        })
                        .setNeutralButton("中立", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(mContext, "你点击了中立按钮~", Toast.LENGTH_SHORT).show();
                            }
                        }).create();             //创建AlertDialog对象
                alert.show();                    //显示对话框
                break;
            //普通列表对话框
            case R.id.btn_dialog_two:
                final String[] lesson = new String[]{"语文", "数学", "英语", "化学", "生物", "物理", "体育"};
                alert = null;
                builder = new AlertDialog.Builder(mContext);
                alert = builder.setIcon(R.mipmap.ic_icon_fish).setTitle("选择你喜欢的课程").setItems(lesson,newDialogInterface.OnClickListener(){@Overridepublicvoid onClick(DialogInterface dialog,int which){Toast.makeText(getApplicationContext(),"你选择了"+ lesson[which],Toast.LENGTH_SHORT).show();}}).create();
                alert.show();break;//单选列表对话框case R.id.btn_dialog_three:finalString[] fruits =newString[]{"苹果","雪梨","香蕉","葡萄","西瓜"};
                alert =null;
                builder =newAlertDialog.Builder(mContext);
                alert = builder.setIcon(R.mipmap.ic_icon_fish).setTitle("选择你喜欢的水果，只能选一个哦~").setSingleChoiceItems(fruits,0,newDialogInterface.OnClickListener(){@Overridepublicvoid onClick(DialogInterface dialog,int which){Toast.makeText(getApplicationContext(),"你选择了"+ fruits[which],Toast.LENGTH_SHORT).show();}}).create();
                alert.show();break;//多选列表对话框case R.id.btn_dialog_four:finalString[] menu =newString[]{"水煮豆腐","萝卜牛腩","酱油鸡","胡椒猪肚鸡"};//定义一个用来记录个列表项状态的boolean数组
                checkItems =newboolean[]{false,false,false,false};
                alert =null;
                builder =newAlertDialog.Builder(mContext);
                alert = builder.setIcon(R.mipmap.ic_icon_fish).setMultiChoiceItems(menu, checkItems,newDialogInterface.OnMultiChoiceClickListener(){@Overridepublicvoid onClick(DialogInterface dialog,int which,boolean isChecked){
                                checkItems[which]= isChecked;}}).setPositiveButton("确定",newDialogInterface.OnClickListener(){@Overridepublicvoid onClick(DialogInterface dialog,int which){String result ="";for(int i =0; i < checkItems.length; i++){if(checkItems[i])
                                        result += menu[i]+" ";}Toast.makeText(getApplicationContext(),"客官你点了:"+ result,Toast.LENGTH_SHORT).show();}}).create();
                alert.show();break;}}}