public class MainActivity extends BaseActivity{ @Override public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  CheckUpdateUtil.checkUpdate(this);//檢查更新 }}

package com.monkey.monkeymushroom.util;import android.app.AlertDialog;import android.app.NotificationManager;import android.content.Context;import android.content.Intent;import android.net.Uri;import android.os.Environment;import android.support.v4.app.NotificationCompat;import android.text.TextUtils;import android.view.Gravity;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import com.lidroid.xutils.HttpUtils;import com.lidroid.xutils.exception.HttpException;import com.lidroid.xutils.http.ResponseInfo;import com.lidroid.xutils.http.callback.RequestCallBack;import com.umeng.analytics.MobclickAgent;import java.io.File;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;/** * 檢查更新工具類 */public class CheckUpdateUtil { private static NotificationCompat.Builder builder; private static NotificationManager manager; private static final int UPDATE_ID = "0"; /**  * 檢查更新  *  * @param context  * @return  */ public static boolean checkUpdate(Context context) {  // 獲取友盟在線參數（要更新的版本號）  String force_version = MobclickAgent.getConfigParams(context, "version");  if (StringUtils.isEmpty(version)) {   version = "1.0";  }  // 版本號轉換為數組  String[] mUpdateVersionArray = version.split(",");  String curr_version_name = SysInfoUtils.getVersionName(context);  for (int i = 0; i < mUpdateVersionArray .length; i++) {//循環獲取在線參數上設置的版本號   if (curr_version_name.equals(mUpdateVersionArray [i])) {//如果有，代表要更新    if ((mUpdateVersionArray .length > i + 1) && ("Y".equals(mUpdateVersionArray [i + 1]))) {//判斷是否強更     showUpdateDialog(true, context);    } else {//不強更     showUpdateDialog(false, context);    }    return true;// 只要找到對應的版本號，即有更新，結束循環   }  }  return false;//無更新 } /**  * 顯示更新對話框  *  * @param isForceUpdate 是否強制更新  */ public static void showUpdateDialog(final boolean isForceUpdate, final Context context) {  // 獲取更新日志  String update_log = MobclickAgent.getConfigParams(context, "update_log");  // 最新版本  String new_version = MobclickAgent.getConfigParams(context, "new_version");  // 獲取下載地址  final String download_path = MobclickAgent.getConfigParams(context, "new_version_path");  if (TextUtils.isEmpty(update_log) || TextUtils.isEmpty(download_path) || TextUtils.isEmpty(new_version)) {   return;  }  LogMessage.e("monkey", "更新日志--> " + update_log + " 最新版本--> " + new_version + " 下載地址--> " + download_path);  //彈框提示  final AlertDialog mAlertDialog = new AlertDialog.Builder(context).create();  mAlertDialog.show();  mAlertDialog.setCancelable(false);  Window window = mAlertDialog.getWindow();  window.setGravity(Gravity.BOTTOM);  window.setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT);  View view = View.inflate(context, R.layout.dialog_update, null);  window.setContentView(view);  TextView log_head = (TextView) view.findViewById(R.id.log_head);  TextView msg_tv = (TextView) view.findViewById(R.id.msg_tv);  log_head.setText("v" + new_version + "更新日志：");  msg_tv.setText(update_log);  Button update = (Button) view.findViewById(R.id.yes_btn);  Button notNow = (Button) view.findViewById(R.id.no_btn);  update.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    download(context, download_path);    mAlertDialog.dismiss();   }  });  notNow.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    mAlertDialog.dismiss();   }  });  if (isForceUpdate) {//如果是強制更新，則不顯示“以后再說”按鈕   notNow.setVisibility(View.GONE);  } } /**  * 下載apk  */ private static void download(final Context context, String download_path) {  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {   String apkName = download_path.substring(download_path.lastIndexOf("/") + 1);   String target = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + apkName;   LogMessage.e("monkey", "apk target -->" + target);   if (NetUtils.isNetConnect(context)) {    HttpUtils httpUtils = new HttpUtils(1000 * 10);//為了方便使用了xUtils    httpUtils.download(download_path, target, false, true, new RequestCallBack<File>() {     @Override     public void onStart() {      super.onStart();      ToastUtil.show(context, "正在下載……");      //創建通知欄下載提示      builder = new NotificationCompat.Builder(context);      builder.setSmallIcon(R.drawable.ic_launcher)        .setOngoing(true)        .setContentTitle("猴菇先生");      manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);     }     @Override     public void onLoading(long total, long current, boolean isUploading) {      super.onLoading(total, current, isUploading);      LogMessage.e("monkey", "--> total " + total + " current " + current);      int cur = (int) (current * 100 / total);      LogMessage.e("monkey", "cur--> " + cur + "%");      builder.setProgress(100, cur, false)//更新進度        .setContentText(cur + "%");      manager.notify(UPDATE_ID, builder.build());     }     @Override     public void onSuccess(ResponseInfo<File> responseInfo) {      manager.cancel(UPDATE_ID);//取消通知欄下載提示      //下載成功后自動安裝apk并打開      File file = responseInfo.result;      Intent intent = new Intent(Intent.ACTION_VIEW);      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);      intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");      context.startActivity(intent);     }     @Override     public void onFailure(HttpException e, String s) {      ToastUtil.show(context, "當前網絡不可用，請檢查網絡設置");     }    });   } else {    ToastUtil.show(context, "當前網絡不可用，請檢查網絡設置");   }  } else {   ToastUtil.show(context, "SD卡沒有插好");  } }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <RelativeLayout  android:layout_width="310dp"  android:layout_height="wrap_content"  android:layout_centerInParent="true"  android:background="@color/base_white"  android:paddingBottom="20dp">  <TextView   android:id="@+id/title"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_centerHorizontal="true"   android:layout_marginBottom="20dp"   android:layout_marginTop="20dp"   android:text="發現新版本"   android:textSize="20sp" />  <View   android:id="@+id/line"   android:layout_width="match_parent"   android:layout_height="1dp"   android:layout_below="@+id/title"   android:background="#4a7acd" />  <TextView   android:id="@+id/log_head"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_below="@+id/line"   android:layout_marginLeft="20dp"   android:layout_marginTop="20dp" />  <TextView   android:id="@+id/msg_tv"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_below="@+id/log_head"   android:layout_centerHorizontal="true"   android:layout_marginLeft="32dp"   android:layout_marginRight="32dp"   android:text="更新日志"   android:textSize="16sp" />  <LinearLayout   android:layout_width="match_parent"   android:layout_height="35dp"   android:layout_below="@+id/msg_tv"   android:layout_marginTop="30dp"   android:orientation="horizontal">   <Button    android:id="@+id/yes_btn"    android:layout_width="0dp"    android:layout_height="35dp"    android:layout_marginLeft="20dp"    android:layout_marginRight="20dp"    android:layout_weight="1"    android:background="#4a7acd"    android:gravity="center"    android:text="立即更新"    android:textColor="@color/base_white"    android:textSize="16sp" />   <Button    android:id="@+id/no_btn"    android:layout_width="0dp"    android:layout_height="35dp"    android:layout_marginRight="20dp"    android:layout_weight="1"    android:background="#4a7acd"    android:gravity="center"    android:text="以后再說"    android:textColor="@color/base_white"    android:textSize="16sp" />  </LinearLayout> </RelativeLayout></RelativeLayout>