android实现app版本更新案例
AndroidMainfest.xml。配置相关权限
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.mytest.versionupdate" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" /> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
main.xml，
<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" tools:context="com.mytest.autoupdate.MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> </RelativeLayout>
downloadapk_progress.xml，自定义下载进度view
<LinearLayout 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" tools:context="com.mytest.autoupdate.MainActivity" > <ProgressBar android:id="@+id/download_progressbar" android:layout_width="fill_parent" android:layout_height="wrap_content" style="?android:attr/progressBarStyleHorizontal" /> </LinearLayout>
MainActivity.java 中调用自动更新
package com.mytest.autoupdate;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new AutoUpdateManager(this).checkIsNeedUpdate();
}
}
AutoUpdateManager.java
package com.mytest.autoupdate; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import org.json.JSONException; import org.json.JSONObject; import org.json.JSONTokener; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.app.Dialog; 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.Environment; import android.os.Handler; import android.os.Message; import android.text.AlteredCharSequence; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.widget.ProgressBar; import android.widget.Toast; public class AutoUpdateManager { private final String LOG_TAG = "AutoUpdateManager"; private Context context; public AutoUpdateManager(Context context) { this.context = context; } // 判断版本更新url private final String CHECK_VERSION__URL = "http://192.168.23.1:8080/testapp/version_json"; /** * 检查是否需要更新 */ public void checkIsNeedUpdate() { // 获取版本信息 new Thread(new Runnable() { @Override public void run() { // 获取版本信息 String versionJson = getVersionInfo(); if (versionJson != null && !"".equals(versionJson.trim())) { Message msg = versionInfoHandler.obtainMessage(); msg.obj = versionJson; versionInfoHandler.sendMessage(msg); } } }).start(); // 对比版本 if (!isLastVersion()) { new AlertDialog.Builder(context).setTitle("提示").setMessage("软件有更新，是否下载更新？") .setPositiveButton("立即更新", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // 显示下载进度条 showDownLoadDialog(); // 下载apk文件 downloadAPKFile(); // 安装apk // todo } }).setNegativeButton("下次再说", null).create().show(); } else { Toast.makeText(context, "已经是最新版本", Toast.LENGTH_SHORT).show(); } } private ProgressBar download_progressbar; private AlertDialog downLoadDialog; private boolean isCancelDownload = false; private final int DOWNLOAD_STATE_FININSH = 1; private final int DOWNLOAD_STATE_LOAD = 0; private int downloadCurProgress; private Handler downloadHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.arg1) { case DOWNLOAD_STATE_LOAD: download_progressbar.setProgress(downloadCurProgress); break; case DOWNLOAD_STATE_FININSH: downLoadDialog.dismiss(); installAPK(); break; } } }; private void showDownLoadDialog() { downLoadDialog = new AlertDialog.Builder(context).setTitle("下载中") .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { isCancelDownload = true; } }).create(); View view = LayoutInflater.from(context).inflate(R.layout.downloadapk_progress, null); downLoadDialog.setView(view); download_progressbar = (ProgressBar) view.findViewById(R.id.download_progressbar); downLoadDialog.show(); } /** * 下载apk文件 */ private void downloadAPKFile() { Log.v(LOG_TAG, "downloadAPKFile->" + versiondownloadurl); new Thread(new Runnable() { @Override public void run() { try { if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { String dirPath = Environment.getExternalStorageDirectory() + "/"; saveApkPath = dirPath + "autoupdate"; File file = new File(saveApkPath); if (file.exists() == false) { file.mkdir(); } saveApkFileName = "version" + versioncode; File apkFile = new File(saveApkPath,saveApkFileName ); FileOutputStream fos = new FileOutputStream(apkFile); HttpURLConnection conn = (HttpURLConnection) new URL(versiondownloadurl).openConnection(); int fileSize = conn.getContentLength(); InputStream is = conn.getInputStream(); int len = 0; int count = 0; byte[] buff = new byte[1024]; while (!isCancelDownload) { len = is.read(buff); // 计算当前进度 count += len; // Log.v(LOG_TAG, "downloadCurProgress->"+"count:"+count+",fileSize:"+fileSize); downloadCurProgress = (int) (((float)count / fileSize) * 100); // Log.v(LOG_TAG, "downloadCurProgress->"+downloadCurProgress); Message msg = downloadHandler.obtainMessage(); msg.arg1 = DOWNLOAD_STATE_LOAD; downloadHandler.sendMessage(msg); if (len < 0) { Message msg2 = downloadHandler.obtainMessage(); msg2.arg1 = DOWNLOAD_STATE_FININSH; //注意必须发送新的消息对象 downloadHandler.sendMessage(msg2); break; } fos.write(buff, 0, len); } is.close(); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start(); } /** * 是否是最新版本 * * @return */ private boolean isLastVersion() { try { int curVer = context.getPackageManager().getPackageInfo("com.mytest.autoupdate", 0).versionCode; if (curVer < versioncode) { return true; } } catch (NameNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return false; } // 版本信息。 private int versioncode; private String versionname; private String versiondesc; private String versiondownloadurl; private String saveApkFileName; private String saveApkPath;// apk保存路径 private Handler versionInfoHandler = new Handler() { public void handleMessage(Message msg) { String versionJson = (String) msg.obj; try { JSONTokener jt = new JSONTokener(versionJson); JSONObject obj = (JSONObject) jt.nextValue(); // demo数据 // {"versioncode":3,"versionname":"testapp","desc":"增加了XX功能","versiondownloadurl":"http://192.168.23.1:8080/testapp/VersionUpdate.apk"} versionname = obj.getString("versionname"); versiondesc = obj.getString("versiondesc"); versiondownloadurl = obj.getString("versiondownloadurl"); versioncode = obj.getInt("versioncode"); Log.v(LOG_TAG, versionname + "," + versioncode); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } }; }; /** * 获取版本信息 */ private String getVersionInfo() { StringBuffer jsonRst = new StringBuffer(); try { HttpURLConnection conn = (HttpURLConnection) new URL(CHECK_VERSION__URL).openConnection(); conn.setRequestMethod("GET"); InputStream is = conn.getInputStream(); int len = 0; byte[] buffer = new byte[1024]; while ((len = is.read(buffer)) != -1) { jsonRst.append(new String(buffer, 0, len, "UTF-8")); } is.close(); } catch (Exception e) { e.printStackTrace(); } return jsonRst.toString(); } /** * 安装apk */ private void installAPK() { File file = new File(saveApkPath+"/"+saveApkFileName); if(file.exists()==false){ return; } Intent intent = new Intent(); Uri uri = Uri.parse("file://"+file.toString()); intent.setDataAndType(uri, "application/vnd.android.package-archive"); context.startActivity(intent); }; }
主要知识点：
1、handler与message的使用；
2、自定义dialog的使用（在下载进度中）;
3、下载文件到sd中。
4、安装apk文件。
5、json网络获取与解析。
