LoginFragment.java

package com.halzhang.android.apps.startupnews.ui.fragment;


import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import com.halzhang.android.apps.startupnews.Constants;
import com.halzhang.android.apps.startupnews.R;
import com.halzhang.android.apps.startupnews.presenter.LoginContract;
import com.halzhang.android.common.CDToast;

import rx.Subscription;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link LoginFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class LoginFragment extends BaseFragment implements LoginContract.View {

    // UI references.
    private EditText mUsernameView;

    private EditText mPasswordView;

    private View mLoginFormView;

    private View mLoginStatusView;

    private TextView mLoginStatusMessageView;

    private LoginContract.Presenter mPresenter;

    public LoginFragment() {

    }

    public static LoginFragment newInstance() {
        return new LoginFragment();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onAttach(Context activity) {
        super.onAttach(activity);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_login, null);
        mUsernameView = (EditText) view.findViewById(R.id.username);
        mPasswordView = (EditText) view.findViewById(R.id.password);
        mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
                if (id == R.id.login || id == EditorInfo.IME_NULL) {
                    attemptLogin();
                    return true;
                }
                return false;
            }
        });

        mLoginFormView = view.findViewById(R.id.login_form);
        mLoginStatusView = view.findViewById(R.id.login_status);
        mLoginStatusMessageView = (TextView) view.findViewById(R.id.login_status_message);
        mLoginStatusMessageView.setText(R.string.login_progress_init);
        showProgress(false);
        Button loginBtn = (Button) view.findViewById(R.id.btn_login);
        loginBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                attemptLogin();
            }
        });
        return view;
    }

    /**
     * Attempts to sign in or register the account specified by the login
     * form. If there are form errors (invalid email, missing fields, etc.),
     * the errors are presented and no actual login attempt is made.
     */
    public void attemptLogin() {
        // Reset errors.
        mUsernameView.setError(null);
        mPasswordView.setError(null);

        String username = mUsernameView.getText().toString();
        String password = mPasswordView.getText().toString();

        boolean cancel = false;
        View focusView = null;

        if (TextUtils.isEmpty(password)) {
            mPasswordView.setError(getString(R.string.error_field_required));
            focusView = mPasswordView;
            cancel = true;
        }
        if (TextUtils.isEmpty(username)) {
            mUsernameView.setError(getString(R.string.error_field_required));
            focusView = mUsernameView;
            cancel = true;
        }

        if (cancel) {
            focusView.requestFocus();
        } else {
            mLoginStatusMessageView.setText(R.string.login_progress_signing_in);
            showProgress(true);
            mPresenter.login(username, password);
        }
    }

    /**
     * Shows the progress UI and hides the login form.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    public void showProgress(final boolean show) {
        if (getActivity() == null) {
            //防止 not attact to activity 出错
            return;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
            int shortAnimTime = getResources().getInteger(
                    android.R.integer.config_shortAnimTime);

            mLoginStatusView.setVisibility(View.INVISIBLE);
            mLoginStatusView.animate().setDuration(shortAnimTime).alpha(show ? 1 : 0)
                    .setListener(new AnimatorListenerAdapter() {
                        @Override
                        public void onAnimationEnd(Animator animation) {
                            mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
                        }
                    });

            mLoginFormView.setVisibility(View.INVISIBLE);
            mLoginFormView.animate().setDuration(shortAnimTime).alpha(show ? 0 : 1)
                    .setListener(new AnimatorListenerAdapter() {
                        @Override
                        public void onAnimationEnd(Animator animation) {
                            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
                        }
                    });
        } else {
            mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }


    @Override
    public void onLoginError(Throwable e) {
        e.printStackTrace();
    }

    @Override
    public void onLoginResult(String user) {
        Activity activity = getActivity();
        if (activity == null || activity.isFinishing()) {
            return;
        }
        showProgress(false);
        if (!TextUtils.isEmpty(user)) {
            CDToast.showToast(activity, R.string.tip_login_success);
            Intent intent = new Intent(Constants.IntentAction.ACTION_LOGIN);
            intent.putExtra(Constants.IntentAction.EXTRA_LOGIN_USER, user);
            activity.sendBroadcast(intent);
            activity.finish();
        } else {
            CDToast.showToast(activity, R.string.tip_login_failure);
        }
    }

    @Override
    public void addSubscription(Subscription subscription) {
        mCompositeSubscription.add(subscription);
    }

    @Override
    public void setPresenter(LoginContract.Presenter presenter) {
        mPresenter = presenter;
    }

    @Override
    public boolean isActive() {
        return isAdded();
    }
}