Toolbar添加返回按钮

super.onCreate(savedInstanceState);

        setContentView(R.layout.about);

Toolbar toolBar= (Toolbar) findViewById(R.id.toolbar);

//toolBar.setLogo(R.mipmap.ic_launcher);//设置图标

toolBar.setTitle("关于软件");//设置主标题

setSupportActionBar(toolBar);

getSupportActionBar().setDisplayHomeAsUpEnabled(true);

}

    //close app

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        if (item.getItemId() == android.R.id.home) {

            onBackPressed();

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

图片发自App