我正在尝试异步验证 Nymi band 。但是当我尝试这样做时，出现以下异常:
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
如您所见，我通过以下方法获得了所有的 toast :
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Failed to initialize NCL library!", Toast.LENGTH_LONG).show();
}
});
但我仍然得到了异常(exception)。该方法在onCreate()方法中正常运行时工作正常，但异步运行时失败。
编辑:即使删除了所有的 toast，我仍然遇到异常。
这是我的 Thread 类，我在其中异步调用 validate() :
public class NymiAsync extends AsyncTask<Integer,Integer,Integer> {
@Override
protected Integer doInBackground(Integer... integers) {
try{
TestBluetooth tb=new TestBluetooth();
tb.startValidatingNymi();
}catch (Exception e){
e.printStackTrace();
}
return 0;
}
}
这是我具有验证方法的主类:
public class TestBluetooth extends Activity implements OnClickListener,ProvisionController.ProvisionProcessListener,
ValidationController.ValidationProcessListener {
boolean isBluetoothEnabled = false;
static boolean nclInitialized = false;
static final String LOG_TAG = "AndroidExample";
SharedPreferences prefs;
Button checkBlue,proviNymi,validateNymi,disconnectNymi;
ProvisionController provisionController;
ValidationController valiationController;
boolean connectNymi = true;
int nymiHandle = Ncl.NYMI_HANDLE_ANY;
NclProvision provision;
//NclProvision provisionmid;
String temp_ID,temp_Key;
public String keyuse;
public String iduse;
public LinearLayout progressbar;
public ProgressBar pbHeaderProgress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.testbluetooth);
// I tried this too final Handler timedThread= new Handler(Looper.getMainLooper());
final Handler timedThread=new Handler();
timedThread.postDelayed(new Runnable() {
@Override
public void run() {
NymiAsync task=new NymiAsync();
task.execute(1,1,1);
}
},10000);
}
public void startValidatingNymi(){
progressbar = (LinearLayout) findViewById(R.id.linlaHeaderProgress);
pbHeaderProgress=(ProgressBar) findViewById(R.id.pbHeaderProgress);
pbHeaderProgress.getIndeterminateDrawable().setColorFilter(Color.parseColor("#1109EE"), android.graphics.PorterDuff.Mode.SRC_ATOP);
// prefs = getSharedPreferences(Util.SharedPrefKey, Context.MODE_PRIVATE);
// prefs.edit().clear().commit();
prefs=getSharedPreferences(Util.SharedPrefKey,MODE_PRIVATE);
temp_ID = prefs.getString(Util.provID, null);
temp_Key = prefs.getString(Util.provKey, null);
if ((temp_ID!=null) || (temp_Key!=null)){
// SHOW THE SPINNER WHILE LOADING FEEDS
progressbar.setVisibility(View.VISIBLE);
//Toast.makeText(getBaseContext(), "Nymi band is already provisined" , Toast.LENGTH_SHORT ).show();
initializeNcl();
provision = new NclProvision();
load();
if (valiationController == null) {
valiationController = new ValidationController(TestBluetooth.this);
}
else {
valiationController.stop();
}
valiationController.startValidation(TestBluetooth.this, provision);
proviNymi = (Button) findViewById(R.id.provisionNymi);
proviNymi.setOnClickListener(this);
proviNymi.setEnabled(false);
validateNymi = (Button) findViewById(R.id.validateNymi);
validateNymi.setOnClickListener(this);
validateNymi.setEnabled(false);
disconnectNymi = (Button) findViewById(R.id.disconnectNymi);
disconnectNymi.setOnClickListener(this);
disconnectNymi.setEnabled(false);
}else {
// Toast.makeText(getBaseContext(), "provision key is null!" , Toast.LENGTH_SHORT ).show();
checkBlue = (Button) findViewById(R.id.testBLuetooth);
checkBlue.setOnClickListener(this);
proviNymi = (Button) findViewById(R.id.provisionNymi);
proviNymi.setOnClickListener(this);
validateNymi = (Button) findViewById(R.id.validateNymi);
validateNymi.setOnClickListener(this);
validateNymi.setEnabled(false);
disconnectNymi = (Button) findViewById(R.id.disconnectNymi);
disconnectNymi.setOnClickListener(this);
disconnectNymi.setEnabled(false);
}
}
public void load(){
iduse = prefs.getString(Util.provID,null);
Toast.makeText(getBaseContext(), iduse , Toast.LENGTH_SHORT ).show();
keyuse = prefs.getString(Util.provKey,null);
if ((iduse!=null)||(keyuse!=null)) {
provision.id = new NclProvisionId();
provision.id.v = Base64.decode(iduse, Base64.DEFAULT);
provision.key = new NclProvisionKey();
provision.key.v = Base64.decode(keyuse, Base64.DEFAULT);
final String temp= keyuse.toString();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getBaseContext(), "the temp provision key is " +temp , Toast.LENGTH_SHORT ).show();
}
});
}else {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getBaseContext(), "Provision key is null!" , Toast.LENGTH_SHORT ).show();
}
});
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId() == checkBlue.getId()){
// Toast.makeText(getBaseContext(), "Checking bluetooth is enabled or not!" , Toast.LENGTH_SHORT ).show();
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
// Device does not support Bluetooth
} else {
if (!mBluetoothAdapter.isEnabled()) {
// Bluetooth is not enable :)
// Toast.makeText(getBaseContext(), " bluetooth is not enabled !" , Toast.LENGTH_SHORT ).show();
isBluetoothEnabled=false;
}else {
// Toast.makeText(getBaseContext(), " bluetooth is enabled !" , Toast.LENGTH_SHORT ).show();
isBluetoothEnabled=true;
Log.d("is nabled", "blue is enalble");
}
}
}
if (v.getId()==proviNymi.getId()){
connectNymi = true;
initializeNcl();
nymiHandle = -1;
if (provisionController == null) {
provisionController = new ProvisionController(TestBluetooth.this);
}
else {
provisionController.stop();
}
provisionController.startProvision(TestBluetooth.this);
}
if (v.getId()==validateNymi.getId()){
proviNymi.setEnabled(false);
if (valiationController == null) {
valiationController = new ValidationController(TestBluetooth.this);
}
else {
valiationController.stop();
}
valiationController.startValidation(TestBluetooth.this, provisionController.getProvision());
}
if (v.getId()==disconnectNymi.getId()){
prefs = getSharedPreferences(Util.SharedPrefKey, Context.MODE_PRIVATE);
prefs.edit().clear().commit();
if (nymiHandle >= 0) {
disconnectNymi.setEnabled(false);
validateNymi.setEnabled(true);
proviNymi.setEnabled(true);
Ncl.disconnect(nymiHandle);
nymiHandle = -1;
}
}
}
/**
* Initialize the NCL library
*/
protected void initializeNcl() {
if (!nclInitialized) {
if (connectNymi) {
initializeNclForNymiBand();
}
}
}
/**
* Initialize NCL library for connecting to a Nymi Band
* @return true if the library is initialized
*/
protected boolean initializeNclForNymiBand() {
if (!nclInitialized) {
NclCallback nclCallback = new MyNclCallback();
boolean result = Ncl.init(nclCallback, null, "NCLExample", NclMode.NCL_MODE_DEFAULT, this);
if (!result) { // failed to initialize NCL
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Failed to initialize NCL library!", Toast.LENGTH_LONG).show();
}
});
return false;
}
nclInitialized = true;
// nclInitialized();
}
return true;
}
@Override
public void onStartProcess(ProvisionController controller) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Nymi start provision ..",
Toast.LENGTH_LONG).show();
}
});
}
public void save(){
final String id = Base64.encodeToString(provision.id.v, Base64.DEFAULT);
final String key = Base64.encodeToString(provision.key.v, Base64.DEFAULT);
SharedPreferences pref = getSharedPreferences(Util.SharedPrefKey, MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putString(Util.provID, id);
editor.putString(Util.provKey, key);
editor.apply();
editor.commit();
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(TestBluetooth.this, id + key,
Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onAgreement(final ProvisionController controller) {
nymiHandle = controller.getNymiHandle();
controller.accept();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Agree on pattern: " + Arrays.toString(controller.getLedPatterns()),
Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onProvisioned(final ProvisionController controller) {
nymiHandle = controller.getNymiHandle();
provision = controller.getProvision();
controller.stop();
runOnUiThread(new Runnable() {
@Override
public void run() {
proviNymi.setEnabled(false);
validateNymi.setEnabled(true);
Toast.makeText(TestBluetooth.this, "Nymi provisioned: " + Arrays.toString(provision.id.v),
Toast.LENGTH_LONG).show();
save();
}
});
}
@Override
public void onFailure(ProvisionController controller) {
controller.stop();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Nymi provision failed!",
Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onDisconnected(ProvisionController controller) {
controller.stop();
runOnUiThread(new Runnable() {
@Override
public void run() {
validateNymi.setEnabled(provision != null);
disconnectNymi.setEnabled(false);
Toast.makeText(TestBluetooth.this, "Nymi disconnected: " + provision,
Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onStartProcess(ValidationController controller) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Nymi start validation for: " + Arrays.toString(provision.id.v),
Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onFound(ValidationController controller) {
nymiHandle = controller.getNymiHandle();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Nymi validation found Nymi on: " + Arrays.toString(provision.id.v),
Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onValidated(ValidationController controller) {
nymiHandle = controller.getNymiHandle();
runOnUiThread(new Runnable() {
@Override
public void run() {
validateNymi.setEnabled(false);
disconnectNymi.setEnabled(true);
// HIDE THE SPINNER AFTER LOADING FEEDS
progressbar.setVisibility(View.GONE);
Toast.makeText(TestBluetooth.this, "Nymi validated!",
Toast.LENGTH_LONG).show();
prefs.edit().putBoolean(Util.isValidated, true).commit();
//move to new activity once nymi is validated
Intent intent = new Intent(TestBluetooth.this,CustomNotificationTest.class);
startActivity(intent);
}
});
}
@Override
public void onFailure(ValidationController controller) {
controller.stop();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Nymi validated failed!",
Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onDisconnected(ValidationController controller) {
controller.stop();
runOnUiThread(new Runnable() {
@Override
public void run() {
disconnectNymi.setEnabled(false);
validateNymi.setEnabled(true);
proviNymi.setEnabled(true);
Toast.makeText(TestBluetooth.this, "Nymi disconnected: " + provision,
Toast.LENGTH_LONG).show();
}
});
}
/**
* Callback for NclEventInit
*
*/
class MyNclCallback implements NclCallback {
@Override
public void call(NclEvent event, Object userData) {
Log.d(LOG_TAG, this.toString() + ": " + event.getClass().getName());
if (event instanceof NclEventInit) {
if (!((NclEventInit) event).success) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestBluetooth.this, "Failed to initialize NCL library!", Toast.LENGTH_LONG).show();
}
});
}
}
}
}
}
编辑:将 NYmiAssync 作为内部类后，我可以使用以下命令异步运行它:
new Thread() {
public void run() {
TestBluetooth.this.runOnUiThread(new Runnable(){
@Override
public void run() {
try {
NymiAsync task = new NymiAsync();
task.execute(1, 1, 1);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}.start();
但是，我不知道如何让它每 10 秒运行一次。
最佳答案
问题出在异步任务中:
public class NymiAsync extends AsyncTask<Integer,Integer,Integer> {
@Override
protected Integer doInBackground(Integer... integers) {
try{
TestBluetooth tb=new TestBluetooth();
tb.startValidatingNymi();
}catch (Exception e){
e.printStackTrace();
}
return 0;
}
}
只需将该类设为 TestBluetooth 的内部类，然后调用 startValidatingNymi()
public class NymiAsync extends AsyncTask<Integer,Integer,Integer> {
@Override
protected Integer doInBackground(Integer... integers) {
try{
startValidatingNymi();
}catch (Exception e){
e.printStackTrace();
}
return 0;
}
}
关于java - 如何异步验证 Nymi band？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31123890/