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我正在使用Sinch教程（https://github.com/sinch/android-app-app-calling-headers）作爲我嘗試開發的應用程序的框架。以下是我已經更新併成功初始化sinch客戶端的教程中的登錄類。無法實例化Sinch客戶端-NullPointerException錯誤
public class LoginActivity extends BaseActivity implements SinchService.StartFailedListener {
private Button mLoginButton;
private EditText mLoginName;
private static final int REQUEST_PERMISSION = 10;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
mLoginName = (EditText) findViewById(R.id.loginName);
mLoginButton = (Button) findViewById(R.id.loginButton);
mLoginButton.setEnabled(false);
requestAppPermissions(new String[]{Manifest.permission.RECORD_AUDIO, Manifest.permission.ACCESS_FINE_LOCATION}, R.string.msg, REQUEST_PERMISSION);
mLoginButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
loginClicked();
}
});
}
@Override
public void onPermissionGranted(int requestCode) {
}
@Override
protected void onServiceConnected() {
mLoginButton.setEnabled(true);
getSinchServiceInterface().setStartListener(this);
}
@Override
protected void onPause() {
super.onPause();
}
@Override
public void onStartFailed(SinchError error) {
Toast.makeText(this, error.toString(), Toast.LENGTH_LONG).show();
}
@Override
public void onStarted() {
openPlaceCallActivity();
}
private void loginClicked() {
String userName = mLoginName.getText().toString();
if (userName.isEmpty()) {
Toast.makeText(this, "Please enter a name", Toast.LENGTH_LONG).show();
return;
}
if (!getSinchServiceInterface().isStarted()) {
getSinchServiceInterface().startClient(userName);
} else {
openPlaceCallActivity();
}
}
private void openPlaceCallActivity() {
Intent mainActivity = new Intent(this, PlaceCallActivity.class);
startActivity(mainActivity);
}
}
的客戶端的實例發生在SinchService類，這是如下：
private static final String APP_KEY = "";
private static final String APP_SECRET = "";
private static final String ENVIRONMENT = "sandbox.sinch.com";
public static final String LOCATION = "LOCATION";
public static final String CALL_ID = "CALL_ID";
static final String TAG = SinchService.class.getSimpleName();
private SinchServiceInterface mSinchServiceInterface = new SinchServiceInterface();
private SinchClient mSinchClient;
private String mUserId;
private StartFailedListener mListener;
@Override
public void onCreate() {
super.onCreate();
}
@Override
public void onDestroy() {
if (mSinchClient != null && mSinchClient.isStarted()) {
mSinchClient.terminate();
}
super.onDestroy();
}
private void start(String userName) {
if (mSinchClient == null) {
mUserId = userName;
mSinchClient = Sinch.getSinchClientBuilder().context(getApplicationContext()).userId(userName)
.applicationKey(APP_KEY)
.applicationSecret(APP_SECRET)
.environmentHost(ENVIRONMENT).build();
mSinchClient.setSupportCalling(true);
mSinchClient.startListeningOnActiveConnection();
mSinchClient.addSinchClientListener(new MySinchClientListener());
mSinchClient.getCallClient().addCallClientListener(new SinchCallClientListener());
mSinchClient.start();
}
}
private void stop() {
if (mSinchClient != null) {
mSinchClient.terminate();
mSinchClient = null;
}
}
private boolean isStarted() {
return (mSinchClient != null && mSinchClient.isStarted());
}
@Override
public IBinder onBind(Intent intent) {
return mSinchServiceInterface;
}
public class SinchServiceInterface extends Binder {
public Call callPhoneNumber(String phoneNumber) {
return mSinchClient.getCallClient().callPhoneNumber(phoneNumber);
}
public Call callUser(String userId) {
return mSinchClient.getCallClient().callUser(userId);
}
public Call callUser(String userId, Map<String, String> headers) {
return mSinchClient.getCallClient().callUser(userId, headers);
}
public String getUserName() {
return mUserId;
}
public boolean isStarted() {
return SinchService.this.isStarted();
}
public void startClient(String userName) {
start(userName);
}
public void stopClient() {
stop();
}
public void setStartListener(StartFailedListener listener) {
mListener = listener;
}
public Call getCall(String callId) {
return mSinchClient.getCallClient().getCall(callId);
}
}
public interface StartFailedListener {
void onStartFailed(SinchError error);
void onStarted();
}
private class MySinchClientListener implements SinchClientListener {
@Override
public void onClientFailed(SinchClient client, SinchError error) {
if (mListener != null) {
mListener.onStartFailed(error);
}
mSinchClient.terminate();
mSinchClient = null;
}
@Override
public void onClientStarted(SinchClient client) {
Log.d(TAG, "SinchClient started");
if (mListener != null) {
mListener.onStarted();
}
}
@Override
public void onClientStopped(SinchClient client) {
Log.d(TAG, "SinchClient stopped");
}
@Override
public void onLogMessage(int level, String area, String message) {
switch (level) {
case Log.DEBUG:
Log.d(area, message);
break;
case Log.ERROR:
Log.e(area, message);
break;
case Log.INFO:
Log.i(area, message);
break;
case Log.VERBOSE:
Log.v(area, message);
break;
case Log.WARN:
Log.w(area, message);
break;
}
}
@Override
public void onRegistrationCredentialsRequired(SinchClient client,
ClientRegistration clientRegistration) {
}
}
private class SinchCallClientListener implements CallClientListener {
@Override
public void onIncomingCall(CallClient callClient, Call call) {
Log.d(TAG, "Incoming call");
Intent intent = new Intent(SinchService.this, IncomingCallScreenActivity.class);
intent.putExtra(CALL_ID, call.getCallId());
intent.putExtra(LOCATION, call.getHeaders().get("location"));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
SinchService.this.startActivity(intent);
}
}
}
對於我而言，我需要從我的共享偏好文件夾導出用於所述客戶端的用戶名。我製作了一個虛擬應用程序，它使用了上面相同的框架並添加了共享偏好設置，但我總是得到一個NullPointerException錯誤。以下是我的虛擬應用程序的登錄類。
public class LoginActivity extends BaseActivity implements SinchService.StartFailedListener {
private EditText mLoginName, recipientName, coordinateA, coordinateB;
private Button loginButton;
private static final int REQUEST_PERMISSION = 10;
public static final String DEFAULT = "N/A";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
userName = (EditText) findViewById(R.id.userInput);
recipientName = (EditText) findViewById(R.id.recipientInput);
loginButton = (Button) findViewById(R.id.loginButton);
requestAppPermissions(new String[]{Manifest.permission.RECORD_AUDIO, Manifest.permission.ACCESS_FINE_LOCATION}, R.string.msg, REQUEST_PERMISSION);
SharedPreferences sharedPreferences = getSharedPreferences("MyData", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("user_name", mLoginName.getText().toString());
editor.putString("recipient_name", recipientName.getText().toString());
editor.commit();
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
loginClicked();
}
});
}
@Override
public void onPermissionGranted(int requestCode) {
}
@Override
protected void onServiceConnected() {
getSinchServiceInterface().setStartListener(this);
}
@Override
protected void onPause() {
super.onPause();
}
@Override
public void onStartFailed(SinchError error) {
Toast.makeText(this, error.toString(), Toast.LENGTH_LONG).show();
}
@Override
public void onStarted() {
openPlaceCallActivity();
}
private void loginClicked() {
SharedPreferences sharedPreferences = getSharedPreferences("MyData", MODE_PRIVATE);
String userName = sharedPreferences.getString("user_name", DEFAULT);
if (userName.isEmpty()) {
Toast.makeText(this, "Please enter a name",
Toast.LENGTH_LONG).show();
return;
}
if (!getSinchServiceInterface().isStarted()) {
getSinchServiceInterface().startClient(userName);
} else {
openPlaceCallActivity();
}
}
private void openPlaceCallActivity() {
Intent mainActivity = new Intent(LoginActivity.this, PlaceCallActivity.class);
startActivity(mainActivity);
}
}
將我的登錄類與教程的登錄類進行比較時，唯一區別是變量「userName」的派生位置。我們都有附加在用戶名上的價值;但是，只有一個客戶端能夠建立，而另一個客戶端會拋出NullPointerException錯誤。有人知道爲什麼
編輯：錯誤消息是如下：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.dejon_000.sinchtest2, PID: 32470
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.example.dejon_000.sinchtest2.SinchService$SinchServiceInterface.isStarted()' on a null object reference
at com.example.dejon_000.sinchtest2.LoginActivity.loginClicked(LoginActivity.java:83)
at com.example.dejon_000.sinchtest2.LoginActivity.access$000(LoginActivity.java:17)
at com.example.dejon_000.sinchtest2.LoginActivity$1.onClick(LoginActivity.java:47)
at android.view.View.performClick(View.java:4802)
at android.view.View$PerformClick.run(View.java:20059)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5422)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:914)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
SECOND編輯：getSinchServiceInterface（）方法在BaseActivity類中找到。其計算方法如下：
public abstract class BaseActivity extends Activity implements ServiceConnection {
private SparseIntArray mErrorString;
public static final String DEFAULT = "N/A";
private SinchService.SinchServiceInterface mSinchServiceInterface;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getApplicationContext().bindService(new Intent(this, SinchService.class), this,
BIND_AUTO_CREATE);
mErrorString = new SparseIntArray();
}
@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
if (SinchService.class.getName().equals(componentName.getClassName())) {
mSinchServiceInterface = (SinchService.SinchServiceInterface) iBinder;
onServiceConnected();
}
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
if (SinchService.class.getName().equals(componentName.getClassName())) {
mSinchServiceInterface = null;
onServiceDisconnected();
}
}
protected void onServiceConnected() {
// for subclasses
}
protected void onServiceDisconnected() {
// for subclasses
}
protected SinchService.SinchServiceInterface getSinchServiceInterface() {
return mSinchServiceInterface;
}
public abstract void onPermissionGranted(int requestCode);
public void requestAppPermissions(final String[] requestedPermissions, final int stringId, final int requestCode) {
mErrorString.put(requestCode, stringId);
int permissionCheck = PackageManager.PERMISSION_GRANTED;
boolean showRequestPermissions = false;
for (String permission : requestedPermissions) {
permissionCheck = permissionCheck + ContextCompat.checkSelfPermission(this, permission);
showRequestPermissions = showRequestPermissions || ActivityCompat.shouldShowRequestPermissionRationale(this, permission);
}
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
if (showRequestPermissions) {
Snackbar.make(findViewById(android.R.id.content), stringId, Snackbar.LENGTH_INDEFINITE).setAction("GRANT", new View.OnClickListener() {
@Override
public void onClick(View view) {
ActivityCompat.requestPermissions(BaseActivity.this, requestedPermissions, requestCode);
}
}).show();
} else {
ActivityCompat.requestPermissions(this, requestedPermissions, requestCode);
}
} else {
onPermissionGranted(requestCode);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
int permissionCheck = PackageManager.PERMISSION_GRANTED;
for(int permission : grantResults){
permissionCheck = permissionCheck + permission;
}
if((grantResults.length > 0)&& PackageManager.PERMISSION_GRANTED == permissionCheck){
onPermissionGranted(requestCode);
}else{
Snackbar.make(findViewById(android.R.id.content), mErrorString.get(requestCode), Snackbar.LENGTH_INDEFINITE).setAction("ENABLE", new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent();
i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
i.setData(Uri.parse("package:"+ getPackageName()));
i.addCategory(Intent.CATEGORY_DEFAULT);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
startActivity(i);
}
}).show();
}
}
}
的【什麼是一個NullPointerException，如何解決呢？（可能的複製http://stackoverflow.com/questions/218384/ what-is-a-nullpointerexception-and-how-do-i-fix-it） –
我有點煩惱所有的nullpointerException甚至沒有試圖解決讀取什麼異常說.. btw getSinchServiceInterface爲null時你調用它的isStarted（）方法.. –
我讀錯誤消息，並看到錯誤正在拋出isStarted（）方法 - 我知道這是空的那一點，但我不知道爲什麼 – Wdej