Browser增加下载路径选择功能

SWE Browser中有xml/download_settings_preferences.xml, 但在代码中却没有调用，导致“设置”中没有”选择下载路径“功能。

在com.android.browser.preferences.GeneralPreferencesFragment增加”选择下载路径“功能

/*add for download path choose*/
private void onInitdownloadSettingsPreference() {
        addPreferencesFromResource(R.xml.download_settings_preferences);
        PreferenceScreen downloadPathPreset =
                (PreferenceScreen) findPreference(PreferenceKeys.PREF_DOWNLOAD_PATH);
        downloadPathPreset.setOnPreferenceClickListener(onClickDownloadPathSettings());

        String downloadPath = downloadPathPreset.getSharedPreferences().
                getString(PreferenceKeys.PREF_DOWNLOAD_PATH,
                        BrowserSettings.getInstance().getDownloadPath());
        String downloadPathForUser = DownloadHandler.getDownloadPathForUser(this.getActivity(),
                downloadPath);
        downloadPathPreset.setSummary(downloadPathForUser);

    }

    private Preference.OnPreferenceClickListener onClickDownloadPathSettings() {
        return new Preference.OnPreferenceClickListener() {
            public boolean onPreferenceClick(Preference preference) {
                try {
                    Intent i = new Intent("com.android.fileexplorer.action.DIR_SEL");
                    GeneralPreferencesFragment.this.startActivityForResult(i,
                            DOWNLOAD_PATH_RESULT_CODE);
                } catch (Exception e) {
                    String err_msg = getResources().getString(R.string.activity_not_found,
                            "com.android.fileexplorer.action.DIR_SEL");
                    Toast.makeText(getActivity(), err_msg, Toast.LENGTH_LONG).show();
                }
                return true;
            }
        };
    }
/*end add */

public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        mAdvFrag.onActivityResult(requestCode,resultCode, data);
        /*add for download path choose*/
        if (requestCode == DOWNLOAD_PATH_RESULT_CODE) {
            if (resultCode == Activity.RESULT_OK && data != null) {
                String downloadPath = data.getStringExtra("result_dir_sel");
                if (downloadPath != null) {
                    PreferenceScreen downloadPathPreset =
                            (PreferenceScreen) findPreference(PreferenceKeys.PREF_DOWNLOAD_PATH);
                    Editor editor = downloadPathPreset.getEditor();
                    editor.putString(PreferenceKeys.PREF_DOWNLOAD_PATH, downloadPath);
                    editor.apply();
                    String downloadPathForUser = DownloadHandler.getDownloadPathForUser(
                            this.getActivity(), downloadPath);
                    downloadPathPreset.setSummary(downloadPathForUser);
                }

                return;
            }
        }
        /*end add*/
    }

onCreate中调用onInitdownloadSettingsPreference()，将download_settings_preferences.xml加到布局中。

public void onCreate(Bundle savedInstanceState) {
        ......

        // Load the XML preferences file
        addPreferencesFromResource(R.xml.general_preferences);

        ......

        onInitdownloadSettingsPreference();//add for download path chhoose
    }