检查相机和电话硬件可用性的标准方法只适用,因为SDK> = 5:
Standard way of checking camera and telephony hardware availability works only since SDK >= 5:
PackageManager pm = this.getPackageManager();
boolean hasTelephony=pm.hasSystemFeature(PackageManager.FEATURE_TELEPHONY);
boolean hasCamera=pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
我的问题,我需要在运行时SDK 3定义电话和相机的可用性(安卓1.5)
My problem that I need to runtime define availability of telephony and camera in SDK 3 (Android 1.5)
任何想法?
PS 我明白了Android 1.5是非常过时,但还是我有一大堆的客户运行这些设备的,所以我要与他们保持兼容。
P.S. I understand that Android 1.5 is very outdated, but still I do have bunch of customers running these devices, so I have to keep compatibility with them.
好了,我已经找到解决方案 - 很奇怪,但它的工作。
Well, I have found solution - very odd but it's working.
基本方法,试图让电话服务,如果它是空 - 返回false,如果它不为空(如HTC Flyer的 TelephonyManager
不为null)方法尝试运行 PackageManager.hasSystemFeature(PackageManager.FEATURE_TELEPHONY)
使用反射,因为这种方法不适用于旧版本的SDK。
Basically method tries to get telephony service if it's null - it returns false, if it's not null (e.g. for HTC Flyer TelephonyManager
is not null) method tries to run PackageManager.hasSystemFeature(PackageManager.FEATURE_TELEPHONY)
using reflection, since this method is not available for old versions of SDK.
下面是一个code:
private Boolean hasTelephony;
public boolean hasTelephony()
{
if(hasTelephony==null)
{
TelephonyManager tm=(TelephonyManager )this.getSystemService(Context.TELEPHONY_SERVICE);
if(tm==null)
{
hasTelephony=new Boolean(false);
return hasTelephony.booleanValue();
}
if(this.getSDKVersion() < 5)
{
hasTelephony=new Boolean(true);
return hasTelephony;
}
PackageManager pm = this.getPackageManager();
Method method=null;
if(pm==null)
return hasCamera=new Boolean(false);
else
{
try
{
Class[] parameters=new Class[1];
parameters[0]=String.class;
method=pm.getClass().getMethod("hasSystemFeature", parameters);
Object[] parm=new Object[1];
parm[0]=new String(PackageManager.FEATURE_TELEPHONY);
Object retValue=method.invoke(pm, parm);
if(retValue instanceof Boolean)
hasTelephony=new Boolean(((Boolean )retValue).booleanValue());
else
hasTelephony=new Boolean(false);
}
catch(Exception e)
{
hasTelephony=new Boolean(false);
}
}
}
return hasTelephony;
}
或多或少同样的方法是可行的检查相机的可用性
More or less the same approach is workable for checking of camera availability