[英]java.lang.NullPointerException in signup with google throws null
public class MainActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener, View.OnClickListener {
public SignInButton login;
private TextView name;
private GoogleApiClient googleApiClient;
private GoogleSignInOptions signInOptions;
private static final int REQUEST_CODE = 100;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
signInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN).requestEmail().build();
googleApiClient = new GoogleApiClient.Builder(this).enableAutoManage(this, this).addApi(Auth.GOOGLE_SIGN_IN_API, signInOptions).addApi(AppIndex.API).build();
login = (SignInButton) findViewById(R.id.login);
name = (TextView) findViewById(R.id.name);
login.setSize(SignInButton.SIZE_WIDE);
login.setScopes(signInOptions.getScopeArray());
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(googleApiClient);
startActivityForResult(signInIntent, REQUEST_CODE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE) {
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
GoogleSignInAccount account = result.getSignInAccount();
name.setText(account.getDisplayName());
}
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("Main Page") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
@Override
public void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
googleApiClient.connect();
AppIndex.AppIndexApi.start(googleApiClient, getIndexApiAction());
}
@Override
public void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
AppIndex.AppIndexApi.end(googleApiClient, getIndexApiAction());
googleApiClient.disconnect();
}
}
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.common.SignInButton.setSize(int)' on a null object reference
at snapdirectcom.snap.MainActivity.onCreate(MainActivity.java:42)
tired checking with many changes but neither of them worked 疲惫的检查与许多变化,但他们都没有工作
我注意到你打开了两个布局 - 仔细检查你的评论中的SignInButton是否在activity_login中,因为那是被搜索的,其他一切看起来都是有序的
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