ProgressDialog 简单使用记录

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.liang.at.pa">

    <Button
        android:id="@+id/showProgress"
        android:text="click"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</RelativeLayout>

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();
            }
        });
    }
}