Android 版本更新下载自动安装APK，并解决Android6.0安装失败的问题

现在APP都有版本更新的功能，有的是跳转到浏览器进行下载，感觉比较麻烦，用户体验也不好，简便的方法就是直接下载安装即可。即使用Android自带的DownManager，通过启动一个后台服务进行下载，下载完成之后以广播的形式通知用户安装，方便很多。

比较闹心的还是6.0权限的问题，下载安装需要一个路径，也就需要读写SD卡权限，不过发现一个问题就是：如果自己不定义一个路径，6.0手机下载完成之后，并没有出现安装的界面，只有自己设置了路径才正常。。。

activity跳转到service进行下载

private Intent updataService ;
private static int REQUESTPERMISSION = 110 ;
public void upData(){
updataService = new Intent(SplashActivity.this,  UpdataService.class);
updataService.putExtra("downloadurl",version.url);
if(ContextCompat.checkSelfPermission(this,Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
//申请权限
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUESTPERMISSION);
CommonToast.showToast("请允许权限进行下载安装");
}else{
startService(updataService);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(requestCode==REQUESTPERMISSION){
if(permissions[0].equals(Manifest.permission.WRITE_EXTERNAL_STORAGE)){
if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
if(updataService!=null)
startService(updataService);
}else{
//提示没有权限，安装不了咯
}
}
}
}

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updataService 类直接拿来用

public class UpdataService extends Service {
/**
* 安卓系统下载类
**/
private DownloadManager manager;
/**
* 接收下载完的广播
**/
private DownloadCompleteReceiver receiver;
private String url;
private String DOWNLOADPATH = "/apk/";//下载路径，如果不定义自己的路径，6.0的手机不自动安装

/**
* 初始化下载器
**/
private void initDownManager() {
manager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
receiver = new DownloadCompleteReceiver();
//设置下载地址
DownloadManager.Request down = new DownloadManager.Request(Uri.parse(url));
// 设置允许使用的网络类型，这里是移动网络和wifi都可以
down.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE
| DownloadManager.Request.NETWORK_WIFI);
down.setAllowedOverRoaming(false);
MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(url));
down.setMimeType(mimeString);
// 下载时，通知栏显示途中
down.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
// 显示下载界面
down.setVisibleInDownloadsUi(true);
// 设置下载后文件存放的位置
down.setDestinationInExternalPublicDir(DOWNLOADPATH, "member.apk");
down.setTitle("member");
// 将下载请求放入队列
manager.enqueue(down);
//注册下载广播
registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

url = intent.getStringExtra("url");
String path = Environment.getExternalStorageDirectory().getAbsolutePath() +DOWNLOADPATH+ "member.apk";
File file = new File(path);
if (file.exists()) {
file.delete();
}
try {
// 调用下载
initDownManager();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(), "下载失败", Toast.LENGTH_SHORT).show();
}
return Service.START_NOT_STICKY;
}

@Override
public IBinder onBind(Intent intent) {

return null;
}

@Override
public void onDestroy() {
if (receiver != null)
// 注销下载广播
unregisterReceiver(receiver);
super.onDestroy();
}

// 接受下载完成后的intent
class DownloadCompleteReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {

//判断是否下载完成的广播
if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
//获取下载的文件id
long downId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
if (manager.getUriForDownloadedFile(downId) != null) {
//自动安装apk
installAPK(manager.getUriForDownloadedFile(downId), context);
//installAPK(context);
} else {
Toast.makeText(context, "下载失败", Toast.LENGTH_SHORT).show();
}
//停止服务并关闭广播
UpdataService.this.stopSelf();
}
}

private void installAPK(Uri apk, Context context) {
if (Build.VERSION.SDK_INT < 23) {
Intent intents = new Intent();
intents.setAction("android.intent.action.VIEW");
intents.addCategory("android.intent.category.DEFAULT");
intents.setType("application/vnd.android.package-archive");
intents.setData(apk);
intents.setDataAndType(apk, "application/vnd.android.package-archive");
intents.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intents);
} else {
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() +DOWNLOADPATH+ "member.apk");
if (file.exists()) {
openFile(file, context);
}
}
}

private void installAPK(Context context) {
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() +DOWNLOADPATH+ "member.apk");
if (file.exists()) {
openFile(file, context);
} else {
Toast.makeText(context, "下载失败", Toast.LENGTH_SHORT).show();
}
}
}

public void openFile(File file, Context context) {
Intent intent = new Intent();
intent.addFlags(268435456);
intent.setAction("android.intent.action.VIEW");
String type = getMIMEType(file);
intent.setDataAndType(Uri.fromFile(file), type);
try {
context.startActivity(intent);
} catch (Exception var5) {
var5.printStackTrace();
Toast.makeText(context, "没有找到打开此类文件的程序", Toast.LENGTH_SHORT).show();
}

}

public String getMIMEType(File var0) {
String var1 = "";
String var2 = var0.getName();
String var3 = var2.substring(var2.lastIndexOf(".") + 1, var2.length()).toLowerCase();
var1 = MimeTypeMap.getSingleton().getMimeTypeFromExtension(var3);
return var1;
}

}

http://blog.csdn.net/asialyf/article/details/53259579