Android中title的管理

常见的Android应用每个Activity或者Fragment都会带有一个Title栏。最普通的就是每个Activity的布局文件中都写一个title。但是这样管理起来比较麻烦，因为每个activity的title栏其实看起来都差不多，基本都包含有返回功能，一个textview描述当前页面，最右侧会是一个更多或者搜索之类的功能按钮。这样我们其实可以使用一个通用的布局，在所有的activity的父类中直接控制title的样式。

1.首先是BaseActivity作为所有Activity的父类

public abstract class BaseActivity extends Activity  {

    public LayoutInflater inflater;
    public Resources mResources;
    public Context mContext;
    public View rootView;
    private View titleView;
    private LinearLayout.LayoutParams params;
    public int layoutId;

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

        inflater = getLayoutInflater();
        layoutId = getContentView();
        rootView = inflater.inflate(layoutId, null);
        mContext = this;
        mResources = mContext.getResources();
        params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int) mResources.getDimension(R.dimen.common_title_height));
        setContentView(rootView);
        findViewById();
        initTitleView();
        initData();
    }

    private void initTitleView() {
        titleView = TitleManager.getInstance(this).initTitleView(layoutId);
        ((ViewGroup) rootView).addView(titleView, 0, params);
    }

    /**
     * 绑定控件id
     */
    protected abstract void findViewById();

    protected abstract void initData();

    /**
     * 初始化控件
     */
    protected abstract int getContentView();

}

2.接着是titlemanager类

public class TitleManager implements View.OnClickListener {

    private static TitleManager uniqueInstance = null;
    private Activity context;
    private View titleView;
    private LayoutInflater inflater;

    private TitleManager(Activity context) {
        this.context = context;
        inflater = context.getLayoutInflater();
    }

    public static TitleManager getInstance(Activity context) {
        if (uniqueInstance == null) {
            uniqueInstance = new TitleManager(context);
        }
        return uniqueInstance;
    }

    public ImageView mCommonTitleLeft;
    public TextView mCityNameTextView;
    public TextView mTitleTextView;
    public ImageView mSearch;
    public ImageView mFavorite;
    public ImageView mShare;

    public View initTitleView(int layoutId) {

        titleView = inflater.inflate(R.layout.view_product_common_title, null);
        mCommonTitleLeft = (ImageView) titleView.findViewById(R.id.common_title_left);
        mCommonTitleLeft.setOnClickListener(this);
        mCityNameTextView = (TextView) titleView.findViewById(R.id.activity_product_home_left);
        mCityNameTextView.setOnClickListener(this);
        mTitleTextView = (TextView) titleView.findViewById(R.id.common_title_center);
        mSearch = (ImageView) titleView.findViewById(R.id.common_title_search);
        mSearch.setOnClickListener(this);
        mFavorite = (ImageView) titleView.findViewById(R.id.details_product_favorite_img);
        mFavorite.setOnClickListener(this);
        mShare = (ImageView) titleView.findViewById(R.id.details_product_shear_img);
        mShare.setOnClickListener(this);

        switch (layoutId) {
            case R.layout.main:
                mCityNameTextView.setVisibility(View.VISIBLE);
                mSearch.setVisibility(View.VISIBLE);
                mTitleTextView.setText(R.string.title_activity_main);
                break;
            case R.layout.main1:
                mCommonTitleLeft.setVisibility(View.VISIBLE);
                mTitleTextView.setText(R.string.title_activity_main1);
                break;
            case R.layout.main2:
                mCommonTitleLeft.setVisibility(View.VISIBLE);
                mFavorite.setVisibility(View.VISIBLE);
                mTitleTextView.setText(R.string.title_activity_main2);
                break;
            case R.layout.main3:
                mCommonTitleLeft.setVisibility(View.VISIBLE);
                mShare.setVisibility(View.VISIBLE);
                mTitleTextView.setText(R.string.title_activity_main3);
                break;

            default:
                mCityNameTextView.setVisibility(View.GONE);
                mSearch.setVisibility(View.GONE);
                mCommonTitleLeft.setVisibility(View.VISIBLE);
                mFavorite.setVisibility(View.GONE);
                mShare.setVisibility(View.GONE);
                break;
        }
        return titleView;
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.common_title_left:
                context.finish();
                break;
            case R.id.common_title_search:
                Toast.makeText(context, "search", Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

3.Activity和xml布局文件就不给了，在后面直接放上demo，里面包含的整个工程。

效果基本是这样的：

下载地址：http://www.oschina.net/action/code/download?code=45216&id=63735