fragment初识

ragement：碎片，ui的一个部分或行为，类似于activity，需嵌入在activity中，一个activity包含多个fragement，可以最大程度适配不同尺寸的手机activity的一部分Oncreate:全局变量赋值，初始化信息。在此之前，已经创建Onattach:fragement绑定activity

Oncreate：oncreateView：给fragement设置页面OnactivityCreated：ondestroyView（）Ondestroy（）Ondetach（）Fragement使用步骤：创建fragement布局文件继承fragement类自定义fragement，实现相关方法Layoutinflate：布局加载器控件？

动态添加：直接在布局文件中引用

静态添加：

public class SecondFragment extends FragmentActivity implements OnClickListener,OnBackgroundChangeListener{
    private Button btnadd;
    @Override
    protected void onCreate(Bundle arg0) {
        // TODO Auto-generated method stub
        super.onCreate(arg0);
        setContentView(R.layout.second_fragment);
        btnadd=(Button) findViewById(R.id.addfragment);
        findViewById(R.id.addfragment).setOnClickListener(this);
        findViewById(R.id.delfragment).setOnClickListener(this);
        findViewById(R.id.hidefragment).setOnClickListener(this);
        findViewById(R.id.showfragment).setOnClickListener(this);
        findViewById(R.id.btnChange).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        FragmentTransaction ft;
        switch(v.getId()){
        case R.id.addfragment:
            //添加fragment道activity
            FragmentManager fm=getSupportFragmentManager();
            ft=fm.beginTransaction();
            ft.add(R.id.fragmentContainer, new FirstFragement(), "chaos");

            ft.commit();
            break;
        case R.id.delfragment:
            //ft=getSupportFragmentManager().beginTransaction();
            Fragment f=getSupportFragmentManager().findFragmentByTag("chaos");
            ((FirstFragement)f).setOnBackgroundChangeListener(this);
            //ft.remove(f);
            //ft.commit();
            break;
        case R.id.showfragment:
            ft=getSupportFragmentManager().beginTransaction();
            Fragment sf=getSupportFragmentManager().findFragmentByTag("chaos");
            ft.show(sf);
            ft.commit();
            break;
        case R.id.hidefragment:
            ft=getSupportFragmentManager().beginTransaction();
            Fragment hf=getSupportFragmentManager().findFragmentByTag("chaos");
            ft.hide(hf);
            ft.commit();
            break;
        case R.id.replacefragment:
            ft=getSupportFragmentManager().beginTransaction();
            ft.replace(R.id.fragmentContainer, new FirstFragement(), "chaoss");
            ft.commit();
            break;
        case R.id.btnChange:
            FirstFragement ff=(FirstFragement) getSupportFragmentManager().findFragmentByTag("chaos");
            if(ff==null){
                return;
            }
            ImageView img=(ImageView) findViewById(R.id.img);
            img.setImageResource(R.drawable.bbe609315da7a9bfa65df713e7c168e0);
            break;
        default:
            break;
        }

    }
    public void onBackgroundChange(){
        btnadd.setBackgroundResource(R.drawable.bc494385774b8343123c5697ebeaeb9);
    }

}