android app 增量升级

private class PatchApkTask extends AsyncTask<String, Void, Integer>
{
@Override
protected Integer doInBackground(String... params)
{
PackageInfo packageInfo = ApkUtils.getInstalledApkPackageInfo(MainActivity.this, Consts.TEST_PACKAGENAME); // 获取当前应用信息
if(packageInfo != null)
{
// 获取旧版本apk资源
String oldApksource = ApkUtils.getSourceApkPath(MainActivity.this, Consts.TEST_PACKAGENAME);


if(!TextUtils.isEmpty(oldApksource))
{
// 检查旧MD5与新
if(ApkSignUtils.checkMd5(oldApksource, oldmd5))
{
// 执行合成 旧版apk资源+差分包patch=new Apk
int patchResult = PatchUtils.patch(oldApksource, Consts.NEW_APK_PATH, Consts.PATCH_PATH);
if(patchResult == 0)// 成功
{
if(ApkSignUtils.checkMd5(Consts.NEW_APK_PATH, newmd5))
{
return WHAT_SUCCESS;// 成功
}
else
{
return WHAT_FAIL_GEN_MD5;// 新版本MD5值错误
}
}
else
{
return WHAT_FAIL_PATCH;// 合成失败
}
}
else
{
return WHAT_FAIL_OLD_MD5;// 新版本md5值不匹配
}
}
else
{
return WHAT_FAIL_GET_SOURCE;// 旧版本apk资源为空
}
}
else
{
return WHAT_FAIL_UNKNOWN;// 当前应用信息为空
}
}


@Override
protected void onPostExecute(Integer result)
{
String text = null;
ProgressDialogUtil.dismiss();
switch (result)
{
case WHAT_SUCCESS:
Toast.makeText(MainActivity.this, "合成成功", Toast.LENGTH_SHORT).show();
ApkUtils.installApk(MainActivity.this, Consts.NEW_APK_PATH);
break;
case WHAT_FAIL_OLD_MD5:
text = "现在安装的WeiboV5.5的MD5不对！";
showToast(text);
break;
case WHAT_FAIL_GEN_MD5:
text = "合成完毕，但是合成得到的apk MD5不对！";
showToast(text);
break;
case WHAT_FAIL_PATCH:
text = "新apk已合成失败！";
showToast(text);
break;
case WHAT_FAIL_GET_SOURCE:
text = "无法获取微博客户端的源apk文件，只能整包更新了！";
showToast(text);
break;
default:
break;
}
}