Android ProgressDailog简单使用

柔情只为你懂 2022-08-23 12:55 125阅读 0赞

package com.android.helloworld;
    
    /*

导入必要的类型

*/
 import android.os.Bundle;
 import android.app.Activity;
 import android.app.ProgressDialog;
 import android.content.*;
 import android.util.Log;
 import android.view.Menu;
 import android.widget.Button;
 import android.view.View; 
 import android.view.View.OnClickListener;
 import android.app.Dialog;
 import android.os.Handler;
 import android.os.Message;
 
 
 public class MainActivity extends Activity {

private ProgressDialog progressDialog; //定义一个私有的变量
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 
 final Button btn2 = (Button)findViewById(R.id.button2);//得到按钮
 btn2.setOnClickListener(new OnClickListener(){//建立按钮的监听按下事件
 	public void onClick(View v){
 		Log.v("TAG","123");
 
 
 progressDialog = ProgressDialog.show(MainActivity.this, "加载中...", "请等待...", true, false); //按下按钮后弹出提示框
 
 //新建线程 用于处理完成后发送消息关闭ProgressDailog
 new Thread(){ 
 
 @Override 
 public void run() { 
 //需要花时间计算的方法 4s后关闭窗口
 try { 
 Thread.sleep(4 * 1000); 
 } catch (Exception e) { 
 // TODO: handle exception 
 } 
 
 //向handler发消息 
 handler.sendEmptyMessage(0); 
 }}.start(); 		
 		
 	}
 	
 });
 }
 
 
 /** 
 * 用Handler来更新UI 
 */ 
 private Handler handler = new Handler(){ 
 
 @Override 
 public void handleMessage(Message msg) { 
 
 //关闭ProgressDialog 
 	progressDialog.dismiss(); //关闭ProgressDailog
 
 }}; 
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 // Inflate the menu; this adds items to the action bar if it is present.
 getMenuInflater().inflate(R.menu.main, menu);
 return true;
 }
 
 
 }