小编use*_*539的帖子

这是我的第一个Android应用程序.我发布了我用于HTTP连接的代码(不是我的,这是来自一个教程站点).问题是当我按下按钮下载文本时,它会显示进度对话框并关闭应用程序强制.我发布了代码.

package com.example.httpconnectsample;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class Httpconnectionsample extends Activity {

private Button getImageButton;
private Button getTextButton;
private ProgressDialog progressDialog;  
private Bitmap bitmap = null;
private String text = null;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) …