openRawResource的做法InputStream ins = getResources().openRawResource(R.raw.my_db_file);
int size = ins.available();
// Read the entire resource into a local byte buffer.
byte[] buffer = new byte[size];
ins.read(buffer);
ins.close();FileOutputStream fos = new FileOutputStream("mycopy.db");
fos.write(buffer);
fos.close();
http://stackoverflow.com/questions/939170/resources-openrawresource-issue-android
http://blog.csdn.net/aomandeshangxiao/article/details/6654386
public static boolean isIntentAvailable(Context context, String action) { final PackageManager packageManager = context.getPackageManager(); final Intent intent = new Intent(action); List<ResolveInfo> list = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY); return list.size() > 0; }
public boolean onPrepareOptionsMenu(Menu menu) {
final boolean scanAvailable = isIntentAvailable(this,
"com.google.zxing.client.android.SCAN");
MenuItem item;
item = menu.findItem(R.id.menu_item_add);
item.setEnabled(scanAvailable);
return super.onPrepareOptionsMenu(menu);
}