BrowseFragment.java

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

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.MenuCompat;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.widget.ShareActionProvider;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import com.halzhang.android.apps.startupnews.R;
import com.halzhang.android.apps.startupnews.analytics.Tracker;
import com.halzhang.android.apps.startupnews.ui.BaseFragmentActivity;
import com.halzhang.android.apps.startupnews.ui.phone.BrowseActivity;
import com.halzhang.android.apps.startupnews.ui.widgets.ObservableWebView;
import com.halzhang.android.apps.startupnews.ui.widgets.ObservableWebView.OnScrollChangedCallback;
import com.halzhang.android.apps.startupnews.ui.widgets.WebViewController;
import com.halzhang.android.apps.startupnews.utils.PreferenceUtils;
import com.halzhang.android.common.CDLog;

/**
 * 浏览器 Created by Hal on 13-5-25.
 */
public class BrowseFragment extends Fragment implements OnScrollChangedCallback {

    private static final String LOG_TAG = BrowseFragment.class.getSimpleName();

    private ObservableWebView mWebView;

    private WebViewController mWebViewController;

    private String mTitle;

    private String mOriginalUrl;

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

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mWebViewController = new WebViewController(getActivity());
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        setHasOptionsMenu(true);
        final View view = inflater.inflate(R.layout.fragment_browse, null);
        mWebView = (ObservableWebView) view.findViewById(R.id.webview);
        Activity activity = getActivity();
        mWebView.setOverScrollMode(View.OVER_SCROLL_NEVER);
        mWebView.setOnScrollChangedCallback(this);
        mWebViewController.initControllerView(mWebView, view);
        Bundle args = getArguments();
        if (args != null && args.containsKey(BrowseActivity.EXTRA_TITLE)
                && args.containsKey(BrowseActivity.EXTRA_URL)) {
            mTitle = args.getString(BrowseActivity.EXTRA_TITLE);
            mOriginalUrl = args.getString(BrowseActivity.EXTRA_URL);
            String mHtmlProvider = PreferenceUtils.getHtmlProvider(activity);
            final String url = mHtmlProvider + mOriginalUrl;
            mWebViewController.loadUrl(url);
        }
        return view;
    }

    @Override
    public void onDestroy() {
        mWebViewController.destroy();
        super.onDestroy();
    }

    public void setTitle(String title) {
        mTitle = title;
    }

    public void load(String url) {
        mOriginalUrl = url;
        String mHtmlProvider = PreferenceUtils.getHtmlProvider(getActivity());
        mWebViewController.loadUrl(mHtmlProvider + mOriginalUrl);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.fragment_browse, menu);
        super.onCreateOptionsMenu(menu, inflater);
        MenuItem actionItem = menu.findItem(R.id.menu_share);
        ShareActionProvider actionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(actionItem);
        if (actionProvider == null) {
            return;
        }
        actionProvider.setShareHistoryFileName(ShareActionProvider.DEFAULT_SHARE_HISTORY_FILE_NAME);
        actionProvider.setShareIntent(createShareIntent());
        actionProvider.setOnShareTargetSelectedListener(new ShareActionProvider.OnShareTargetSelectedListener() {

            @Override
            public boolean onShareTargetSelected(ShareActionProvider source, Intent intent) {
                /*
                 * 这里改变intent是没用的，intent只是一份拷贝，只能自己启动修改后的Intent
                 * 然而自己启动Intent并不会改变历史记录 增加setAllowPolicyChangeIntent方法解决这问题
                 */
                String packageName = intent.getComponent().getPackageName();
                CDLog.i(LOG_TAG, packageName);
                String shareContent = getShareContent();
                intent.putExtra(Intent.EXTRA_SUBJECT, mTitle);
                Tracker.getInstance().sendEvent("ui_action", "share", packageName, 0L);
                if (getString(R.string.weibo_package_name).equals(packageName)) {
                    intent.putExtra(Intent.EXTRA_TEXT, shareContent + " "
                            + getString(R.string.weibo_share_suffix));
                } else {
                    intent.putExtra(Intent.EXTRA_TEXT, shareContent);
                }
                return false;
            }
        });
    }

    /**
     * Creates a sharing {@link Intent}.
     *
     * @return The sharing intent.
     */
    private Intent createShareIntent() {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setType("text/plain");
        intent.putExtra(Intent.EXTRA_SUBJECT, mTitle);
        intent.putExtra(Intent.EXTRA_TEXT, getShareContent());
        return intent;
    }

    private String getShareContent() {
        StringBuilder builder = new StringBuilder();
        return builder.append(mTitle).append(" ").append(mOriginalUrl).toString();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_original_url:
                Tracker.getInstance().sendEvent("ui_action", "options_item_selected", "browseactivity_menu_original_url", 0L);
                mWebViewController.loadUrl(mOriginalUrl);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void onScroll(int l, int t, int oldl, int oldt) {

    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    public void onScrollUp() {
        //TODO 需要判断 Activity 的类型
        BaseFragmentActivity activity = (BaseFragmentActivity) getActivity();
        activity.getSupportActionBar().show();
        mWebViewController.showBrowseBar();
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    public void onScrollDown() {
        BaseFragmentActivity activity = (BaseFragmentActivity) getActivity();
        activity.getSupportActionBar().hide();
        mWebViewController.hideBrowseBar();
    }

}