android - 定义启动 Activity ？

Question

喂!我需要为定义登录按钮的类实现 startActivity。我如何实现 startActivity() 的作用？

这是我的类(class):

public class LoginButton extends ImageButton {

    private Facebook mFb;
    private Handler mHandler;
    private SessionListener mSessionListener = new SessionListener();
    private String[] mPermissions;
    private Activity mActivity;

    public LoginButton(Context context) {
        super(context);
    }

    public LoginButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public LoginButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public void init(final Activity activity, final Facebook fb) {
        init(activity, fb, new String[] {});
    }

    public void init(final Activity activity, final Facebook fb,
                     final String[] permissions) {
        mActivity = activity;
        mFb = fb;
        mPermissions = permissions;
        mHandler = new Handler();

        setBackgroundColor(Color.TRANSPARENT);
        setAdjustViewBounds(true);
        setImageResource(fb.isSessionValid() ?
                         R.drawable.logout_button : 
                         R.drawable.login_button);
        drawableStateChanged();

        SessionEvents.addAuthListener(mSessionListener);
        SessionEvents.addLogoutListener(mSessionListener);
        setOnClickListener(new ButtonOnClickListener());

    }

    private final class ButtonOnClickListener implements OnClickListener {

        public void onClick(View arg0) {
            if (mFb.isSessionValid()) {
                SessionEvents.onLogoutBegin();
                AsyncFacebookRunner asyncRunner = new AsyncFacebookRunner(mFb);
                asyncRunner.logout(getContext(), new LogoutRequestListener());
            } else {
                mFb.authorize(mActivity, mPermissions,
                              new LoginDialogListener());
                Intent i = new Intent(getContext(), com.Xperia.MultipleOptions.class);
                startActivity(i);

            }
        }
    }

    private final class LoginDialogListener implements DialogListener {
        public void onComplete(Bundle values) {
            SessionEvents.onLoginSuccess();
        }

        public void onFacebookError(FacebookError error) {
            SessionEvents.onLoginError(error.getMessage());
        }

        public void onError(DialogError error) {
            SessionEvents.onLoginError(error.getMessage());
        }

        public void onCancel() {
            SessionEvents.onLoginError("Action Canceled");
        }
    }

    private class LogoutRequestListener extends BaseRequestListener {
        public void onComplete(String response, final Object state) {
            // callback should be run in the original thread, 
            // not the background thread
            mHandler.post(new Runnable() {
                public void run() {
                    SessionEvents.onLogoutFinish();
                }
            });
        }
    }

    private class SessionListener implements AuthListener, LogoutListener {

        public void onAuthSucceed() {
            setImageResource(R.drawable.logout_button);
            SessionStore.save(mFb, getContext());
        }

        public void onAuthFail(String error) {
        }

        public void onLogoutBegin() {           
        }

        public void onLogoutFinish() {
            SessionStore.clear(getContext());
            setImageResource(R.drawable.login_button);
        }
    }  
}

在 startActivity(i) 行，我得到了

The method startActivity(Intent) is undefined for the type 
 LoginButton.ButtonOnClickListener

有什么想法吗？

Answer 1

您需要应用上下文来启动新 Intent 。

Yourclass.this.startActivity(something);