toolbar加红点方案就是更换图片

核心代码

//设置ToolBar
        final Toolbar mToolbar = (Toolbar) findViewById(R.id.toolbar);
        mToolbar.setTitleTextColor(Color.WHITE);
        setSupportActionBar(mToolbar);
        actionBar = getSupportActionBar();

        //设置抽屉DrawerLayout
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar,
                R.string.drawer_open, R.string.drawer_close);
        mDrawerToggle.syncState();//初始化状态
        actionBar.setDisplayHomeAsUpEnabled(true);//设置返回箭头显示
        actionBar.setHomeAsUpIndicator(android.R.drawable.ic_lock_power_off);
        mDrawerLayout.setDrawerListener(mDrawerToggle);

如有疑问请戳这里 東方月初