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();             }         });     } }