android 判断程序是否安装

 

1,根据包名判断

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;

}

}

2. 根据Intent判断

public boolean checkApkExist(Context context, Intent intent) {

List<ResolveInfo> list =  context.getPackageManager().queryIntentActivities(intent, 0);

if(list.size() > 0){

return true;

}

return false;

}

 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; }

} 

public boolean checkApkExist(Context context, Intent intent) {
  List<ResolveInfo> list = context.getPackageManager()
    .queryIntentActivities(intent, 0);
  if (list.size() > 0) {
   return true;
  }
  return false;
 }