Activity返回按钮

如图：

package com.maomao.beautymovie;

import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.KeyEvent;
import android.view.MenuItem;


/**
 * 
 * @author NINGXUEFENG
 *
 */
public class BaseActivity extends Activity {

    protected ActionBar mActionBar;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initActionBar();
    }

    private void initActionBar() {
        mActionBar = getActionBar();
        mActionBar.setDisplayHomeAsUpEnabled(true);             // 给左上角图标的左边加上一个返回的图标"《" 。对应ActionBar.DISPLAY_HOME_AS_UP
        mActionBar.setDisplayShowHomeEnabled(true);             //使左上角图标可点击，对应id为android.R.id.home，对应ActionBar.DISPLAY_SHOW_HOME false 则图标无法点击
        mActionBar.setHomeButtonEnabled(true);                  // false 就无法点击
    }

    public void setTitle(int resId) {
        mActionBar.setTitle(resId);
    }

    public void setTitle(CharSequence text) {
        mActionBar.setTitle(text);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
              case android.R.id.home:
                  onBackPressed();
                  return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }


}