package com.example.liang.at;import android.app.ProgressDialog;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;public class pa extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_pa);        Button bt =(Button) findViewById(R.id.showProgress);        bt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                ProgressDialog progressDialog = new ProgressDialog(v.getContext());                progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);                progressDialog.setIcon(R.drawable.loading);                progressDialog.setMessage("Loading...");                progressDialog.setCancelable(false);                progressDialog.show();            }        });    }}