AndroidStudio AlertDialog控件

业务需求：
点击供应商选择按钮出现对话框，选择供应商后tv控件显示选择的供应商名称，点击确定，对话框消失。

public class MainActivity extends AppCompatActivity {

    private TextView tvaMainTitle;
    private Button btnMainClose;
    private Button btnMainSupplier;
    private TextView tvMainResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        btnMainSupplier.setOnClickListener(new View.OnClickListener() {
            String[] suppliers=new String[]{"供应商1", "供应商2", "供应商3"};
            @Override
            public void onClick(View v) {
                //匿名对象  方法链   前提：方法返回值是本对象 不断的去调用方法，不加;  看返回值
               new AlertDialog.Builder(MainActivity.this)//不加;
                        .setTitle("选择供应商")  //不加;
                        .setSingleChoiceItems(suppliers,0, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                tvMainResult.setText(suppliers[which]);
                            }
                        })
                        .setPositiveButton("确定", null) //不加;
                        .create()
                        .show();


//                //      1创建对象
//                AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
//                //2、设置标题、内容和按钮区域
//                builder.setTitle("选择供应商");
//                builder.setPositiveButton("确定",null);
//               //3.创建对话框
//                AlertDialog alertDialog=builder.create();
//                alertDialog.show();
            }
        });
        btnMainClose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //弹出对话框
                //对话框步骤：
                //创建Builder构建器
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                //2、设置标题内容和按钮区域
                builder.setTitle("对话框标题");
                builder.setIcon(R.drawable.ic_launcher_background);
                builder.setMessage("普通对话框");
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();//关闭对话框
                        MainActivity.this.finish();//关闭Activity
                    }
                });
                builder.setNegativeButton("取消", null);//功能一样，直接置空
                builder.setNeutralButton("中立", null);

                //3.创建对话框，然后显示
                AlertDialog dialog = builder.create();
//                dialog.setTitle("对话框标题");
//                dialog.setMessage("普通对话框");
//                dialog.setButton(Dialog.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener() {
//                    @Override
//                    public void onClick(DialogInterface dialog, int which) {
//                        dialog.dismiss();
//                        MainActivity.this.finish();
//                    }
//                });
                dialog.setMessage("普通对话框");
                dialog.show();

            }
        });
    }

    private void initView() {
        tvaMainTitle = (TextView) findViewById(R.id.tvaMainTitle);
        btnMainClose = (Button) findViewById(R.id.btnMainClose);
        btnMainSupplier = (Button) findViewById(R.id.btnMainSupplier);
        tvMainResult = (TextView) findViewById(R.id.tvMainResult);
    }
}

效果图：