原文地址：android 自动更新apk版本
截图如下：
代码实现如下：
package com.update.apk; import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.json.JSONArray; import org.json.JSONObject; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.PackageManager.NameNotFoundException; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.util.Log; public class MainActivity extends Activity { /** Called when the activity is first created. */ String newVerName = "";//新版本名称 int newVerCode = -1;//新版本号 ProgressDialog pd = null; String UPDATE_SERVERAPK = "ApkUpdateAndroid.apk"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); if(getServerVer()){ int verCode = this.getVerCode(this); if(newVerCode>verCode){ doNewVersionUpdate();//更新版本 }else{ notNewVersionUpdate();//提示已是最新版本 } } } /** * 获得版本号 */ public int getVerCode(Context context){ int verCode = -1; try { verCode = context.getPackageManager().getPackageInfo("com.update.apk", 0).versionCode; } catch (NameNotFoundException e) { // TODO Auto-generated catch block Log.e("版本号获取异常", e.getMessage()); } return verCode; } /** * 获得版本名称 */ public String getVerName(Context context){ String verName = ""; try { verName = context.getPackageManager().getPackageInfo("com.update.apk", 0).versionName; } catch (NameNotFoundException e) { Log.e("版本名称获取异常", e.getMessage()); } return verName; } /** * 从服务器端获得版本号与版本名称 * @return */ public boolean getServerVer(){ try { URL url = new URL("http://10.0.2.2:8080/ApkUpdateService/ver"); HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection(); httpConnection.setDoInput(true); httpConnection.setDoOutput(true); httpConnection.setRequestMethod("GET"); httpConnection.connect(); InputStreamReader reader = new InputStreamReader(httpConnection.getInputStream()); BufferedReader bReader = new BufferedReader(reader); String json = bReader.readLine(); JSONArray array = new JSONArray(json); JSONObject jsonObj = array.getJSONObject(0); newVerCode = Integer.parseInt(jsonObj.getString("verCode")); newVerName = jsonObj.getString("verName"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } return true; } /** * 不更新版本 */ public void notNewVersionUpdate(){ int verCode = this.getVerCode(this); String verName = this.getVerName(this); StringBuffer sb = new StringBuffer(); sb.append("当前版本："); sb.append(verName); sb.append(" Code:"); sb.append(verCode); sb.append("\n已是最新版本，无需更新"); Dialog dialog = new AlertDialog.Builder(this) .setTitle("软件更新") .setMessage(sb.toString()) .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub finish(); } }).create(); dialog.show(); } /** * 更新版本 */ public void doNewVersionUpdate(){ int verCode = this.getVerCode(this); String verName = this.getVerName(this); StringBuffer sb = new StringBuffer(); sb.append("当前版本："); sb.append(verName); sb.append(" Code:"); sb.append(verCode); sb.append(",发现版本："); sb.append(newVerName); sb.append(" Code:"); sb.append(verCode); sb.append(",是否更新"); Dialog dialog = new AlertDialog.Builder(this) .setTitle("软件更新") .setMessage(sb.toString()) .setPositiveButton("更新", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub pd = new ProgressDialog(MainActivity.this); pd.setTitle("正在下载"); pd.setMessage("请稍后。。。"); pd.setProgressStyle(ProgressDialog.STYLE_SPINNER); downFile("http://10.0.2.2:8080/ApkUpdateService/ApkUpdateAndroid.apk"); } }) .setNegativeButton("暂不更新", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub finish(); } }).create(); //显示更新框 dialog.show(); } /** * 下载apk */ public void downFile(final String url){ pd.show(); new Thread(){ public void run(){ HttpClient client = new DefaultHttpClient(); HttpGet get = new HttpGet(url); HttpResponse response; try { response = client.execute(get); HttpEntity entity = response.getEntity(); long length = entity.getContentLength(); InputStream is = entity.getContent(); FileOutputStream fileOutputStream = null; if(is != null){ File file = new File(Environment.getExternalStorageDirectory(),UPDATE_SERVERAPK); fileOutputStream = new FileOutputStream(file); byte[] b = new byte[1024]; int charb = -1; int count = 0; while((charb = is.read(b))!=-1){ fileOutputStream.write(b, 0, charb); count += charb; } } fileOutputStream.flush(); if(fileOutputStream!=null){ fileOutputStream.close(); } down(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }.start(); } Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); pd.cancel(); update(); } }; /** * 下载完成，通过handler将下载对话框取消 */ public void down(){ new Thread(){ public void run(){ Message message = handler.obtainMessage(); handler.sendMessage(message); } }.start(); } /** * 安装应用 */ public void update(){ Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory(),UPDATE_SERVERAPK)) , "application/vnd.android.package-archive"); startActivity(intent); } }