弹窗

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    
        private AlertDialog alertDialog1; //信息框
        private AlertDialog alertDialog2; //单选框
        private AlertDialog alertDialog3; //多选框

    
        public void showList(View view){
            final String[] items = {"列表1", "列表2", "列表3", "列表4"};
            AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this);
            alertBuilder.setTitle("这是列表框");
            alertBuilder.setItems(items, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    Toast.makeText(MainActivity.this, items[i], Toast.LENGTH_SHORT).show();
                    alertDialog1.dismiss();
                }
            });
            alertDialog1 = alertBuilder.create();
            alertDialog1.show();
        }

        public void showSingleAlertDialog(View view){
            final String[] items = {"单选1", "单选2", "单选3", "单选4"};
            AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this);
            alertBuilder.setTitle("这是单选框");
            alertBuilder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    Toast.makeText(MainActivity.this, items[i], Toast.LENGTH_SHORT).show();
                }
            });

            alertBuilder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    alertDialog2.dismiss();
                }
            });

            alertBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    alertDialog2.dismiss();
                }
            });

            alertDialog2 = alertBuilder.create();
            alertDialog2.show();
        }

        public void showMutilAlertDialog(View view){
            final String[] items = {"多选1", "多选2", "多选3", "多选4"};
            AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this);
            alertBuilder.setTitle("这是多选框");
            /**
             *第一个参数:弹出框的消息集合，一般为字符串集合
             * 第二个参数：默认被选中的，布尔类数组
             * 第三个参数：勾选事件监听
             */
            alertBuilder.setMultiChoiceItems(items, null, new DialogInterface.OnMultiChoiceClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i, boolean isChecked) {
                    if (isChecked){
                        Toast.makeText(MainActivity.this, "选择" + items[i], Toast.LENGTH_SHORT).show();
                    }else {
                        Toast.makeText(MainActivity.this, "取消选择" + items[i], Toast.LENGTH_SHORT).show();
                    }
                }
            });
            alertBuilder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    alertDialog3.dismiss();
                }
            });

            alertBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    alertDialog3.dismiss();
                }
            });


            alertDialog3 = alertBuilder.create();
            alertDialog3.show();
        }

    }