android 判断应用程序是否已安装

1、判断是否安装
/*
* check the app is installed
*/
private boolean isAppInstalled(Context context,String packagename)
{
PackageInfo packageInfo;
try {
packageInfo = context.getPackageManager().getPackageInfo(packagename, 0);
}catch (NameNotFoundException e) {
packageInfo = null;
e.printStackTrace();
}
if(packageInfo ==null){
//System.out.println("没有安装");
return false;
}else{
//System.out.println("已经安装");
return true;
}
}

2、判断后的逻辑：（转自：http://ruixiazun.blog.163.com/blog/static/906879182013021115923732/）
//已安装，打开程序，需传入参数包名："com.skype.android.verizon"
if(isAvilible(this, "com.skype.android.verizon")){
Intent i = new Intent();
ComponentName cn = new ComponentName("com.skype.android.verizon",
"com.skype.android.verizon.SkypeActivity");
i.setComponent(cn);
startActivityForResult(i, RESULT_OK);
}
//未安装，跳转至market下载该程序
else {
Uri uri = Uri.parse("market://details?id=com.skype.android.verizon");//id为包名
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
}

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