Android--AlertDialog(3)多选

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private TextView text_interest;

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

        initView();
    }

    private void initView() {
        text_interest=findViewById(R.id.text_interest);
        text_interest.setOnClickListener(this);

    }

    public void onClick(View view){
        AlertDialog.Builder builder=new AlertDialog.Builder(this);
        String[] showMsg =new String[]{"电影","旅游","睡觉","读书"};
        boolean[] isCheck =new boolean[]{true,false,false,false};
        // 构建对话框的模型
        builder.setMultiChoiceItems(showMsg, isCheck, new DialogInterface.OnMultiChoiceClickListener() {
            @Override
            // i:选中哪一项返回此项的序号 isChecked:被点击项的选中状态，选中返回 true,否则 false
            public void onClick(DialogInterface dialogInterface, int i, boolean isChecked) {
                isCheck[i] = isChecked;
            }
        });
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                StringBuffer str = new StringBuffer();
                for(int j=0;j<isCheck.length;j++){
                    if(isCheck[j]==true){
                        str.append(showMsg[j]).append("$$$");
                    }
                }
                Toast.makeText(MainActivity.this,str,Toast.LENGTH_SHORT).show();
            }
        });
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();
            }
        });
        AlertDialog adialog =builder.create();
        adialog.show();

    }
}