android apk是否安装成功

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没有eoe的账号，级别还太低，出门如何吹牛*？
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如下代码啊：

//检查应用程序是否安装并安装应用程序

public boolean checkApkExist(Context context, String packageName) {
if (packageName == null || "".equals(packageName))
return false;
try {
ApplicationInfo info = context.getPackageManager()
.getApplicationInfo(packageName,
PackageManager.GET_UNINSTALLED_PACKAGES);
return true;
} catch (NameNotFoundException e) {
return false;
}
}

private void installVoiceServiceApk() {

Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(Intent.ACTION_VIEW);
String type = "application/vnd.android.package-archive";
AssetManager assets = ProActivity.this.getAssets();
try {
//当文件比较大的时候不能用这个方法 来读取Stream ss.read(buffer) = -1 我的apk大小为5M
InputStream ss = assets.open(AsrService.apk");
//使用下面这个方法 没问题
InputStream is = getClass().getResourceAsStream(
"/assets/AsrService.apk");

FileOutputStream fos = ProActivity.this.openFileOutput(
"AsrService.apk", Context.MODE_PRIVATE
+ Context.MODE_WORLD_READABLE);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
fos.write(buffer, 0, len);
}
fos.flush();
is.close();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
File f = new File(ProActivity.this.getFilesDir().getPath()
+ "/AsrService.apk");

// String path = "file:///android_asset/ZXing.apk";
// File f = new File(path);
intent.setDataAndType(Uri.fromFile(f), type);
ProActivity.this.startActivity(intent);

}

//检查服务是否启动
private boolean isStartService(Context ctx) {
ActivityManager mActivityManager = (ActivityManager) ctx
.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningServiceInfo> currentService = mActivityManager
.getRunningServices(100);
final String igrsClassName = "com.iflytek.asr.AsrService"; //serviceName
boolean b = igrsBaseServiceIsStart(currentService, igrsClassName);
return b;
}

private boolean igrsBaseServiceIsStart(
List<ActivityManager.RunningServiceInfo> mServiceList,
String className) {
for (int i = 0; i < mServiceList.size(); i++) {
if (className.equals(mServiceList.get(i).service.getClassName())) {
return true;
}
}
return false;
}