我无法弄清楚如何等待用户选择是否启用蓝牙。如果应用程序在没有启用蓝牙的情况下启动它会崩溃,因为我不等待此行的结果:
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
我该如何等到用户选择是或否来启用蓝牙? -Thanks
答案 0 :(得分:2)
您必须覆盖onActivityResult,如本文所述。
http://developer.android.com/training/basics/intents/result.html
这是一般流程:
您应检查结果或检查是否在调用该方法后打开蓝牙。并根据您现有的信息继续执行。
文章中的代码段:
static final int PICK_CONTACT_REQUEST = 1; // The request code
private void pickContact() {
Intent pickContactIntent = new Intent(Intent.ACTION_PICK, Uri.parse("content://contacts"));
pickContactIntent.setType(Phone.CONTENT_TYPE); // Show user only contacts w/ phone numbers
startActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// Check which request we're responding to
if (requestCode == PICK_CONTACT_REQUEST) {
// Make sure the request was successful
if (resultCode == RESULT_OK) {
// The user picked a contact.
// The Intent's data Uri identifies which contact was selected.
// Do something with the contact here (bigger example below)
}
}
}