Android开发工程师文集-Fragment，适配器，轮播图，ScrollView，Gallery 图片浏览器，Android常用布局样式

Fragment

FragmentManager fragmentManager = getFragmentManager();FragmentTransaction beginTransaction = fragmentManager.beginTransaction();

事务

add(),remove(),replace(),commit()

MyFragment2 fragment2=new MyFragment2();FragmentManager fragmentManager = getFragmentManager();FragmentTransaction beginTransaction = fragmentManager.beginTransaction();beginTransaction.add(R.id.frame,fragement2);beginTransaction.commit();

fragment的生命周期

Created

onAttach()->onCreate()->onCreateView()->onActivityCreated()

Started

onStart()

Resumed

onResume()

Paused

onPause()

Stopped

onStop()

Destroyed

onDestroyView()->onDestroy()->onDetach()

//当Fragment被添加到Activity的时候回调这个方法，并且只调用一次@Overridepublic void onAttach(Activity activity){    super.onAttach(activity);}

//创建Fragment时会回调，只调用一次@Overridepublic void onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);}

//每次创建回调@Overridepublic View onCreateView(## ##){}

//当Fragment所在的Activity启动完成后调用@Overridepublic void onActivityCreated(Bundle savedInstanceState){    super.onActivityCreated(savedInstanceState);}

//启动onStart()@Overridepublic void onStart(){    super.onStart();}

//onResume@Overridepublic void onResume(){    super.onResume();}

//onPause 暂停@Overridepublic void onPause(){    super.onPause();}

//onStop 停止@Overridepublic void onStop(){    super.onStop();}

//last

//onDestroyView@Overridepublic void onDestroyView(){    super.onDestroyView();}

//销毁

//onDestroy@Overridepublic void onDestroy(){    super.onDestroy();}

重点
删除Fragment
//onDetach

@Overridepublic void onDetach(){    super.onDetach();}

启动Fragment

onAttach()->onCreate()->onCreateView()->onActivityCreated()->onStart()->onResume()

暂停Fragment - //暂停和停止的方法

onPause()->onStop()

重新看到Fragment

onStart()->onResume()

Fragment1 -> Fragment2

Fragment1: onPause()->onStop()->onDestroyView->onDestroy()->onDetach()Fragment2: onAttach()->onCreate()->onCreateView()->onActivityCreated()->onStart()->onResume()

Fragment2回到主界面时

onPause()->onStop()

又重新看见

//Fragment2回到界面 onStart()->onResume()

Fragment2 退出

onPause()->onStop()->onDestroyView()->onDestroy()->onDetach()

Fragment与Activity

1. Fragment是通过调用getActivity()的方法获取Activity的；
2. Activity是通过调用FragmentManager的findFramentById()的，也可以用findFragmentByTag()方法获取Fragment片段的。

重点

public class MyFragment extends Fragment{    @Override    public View onCreateView(LayoutInflater inflater,ViewGrop container,Bundle savedInstanceState){        return super.onCreateView(inflater,container,savedInstanceState);        //View view = inflater.inflate(R.layout.fragment, container, false);        //TextView tv = view.findViewById(R.id.textview);        //return view;    }}

一个Activity调用Fragment的界面显示数据内容

String text = editext.getText().toString();MyFragment fragment = new MyFragment();Bundle bundle = new Bundle();bundle.putString("name",text);fragment.setArguments(bundle);FragmentManager fragmentManager = getFragmentManager();FragmentTransaction beginTransaction = fragmentManager.beginTransaction();//beginTransaction.add(containerViewId,fragment,tag)beginTransaction.add(R.id.layout.textview,fragment,"fragment");beginTransaction.commit();

在Fragement中设置

public class MyFragment extends Fragment{    @0verride    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){        View view = inflater.infate(R.layout.fragement,container,false);        TextView tv=view.findViewById(R.id.textview);        String text = getArguments().get("name")+"";        tv.setText(text);    }}

Fragment

private String name = "v";public interface Myvoid{    public void name(String name);}

Activity

implements Myvoid

fragment

@Overridepublic void onAttach(Activity activity){    myvoid = activity;    super.onAttach(activity);}

回到Activity

覆盖方法

另类

xml

<?xml version="1.0" encoding="utf-8"?>    

Fragment

public class MyinfoFragment extends Fragment implements View.OnClickListener{    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_myinfo, null);    }    @Override    public void onViewCreated(View view, Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);    }    @Override    public void onClick(View v) {    }}

MainActivity

public class MainActivity extends FragmentActivity implements View.OnClickListener{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);        setMain();    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {           }    private void setMain() {            }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);            }    private void setSelectStatus(int index) {        switch (index){                    }    }    private void initView() {            }    @Override    public void onClick(View v) {        switch (v.getId()){                    }    }}

继续

FragmentManager fragmentManager = getFragmentManager();Fragment findFragmentById = fragmentManager.findFragmentById(R.id.fragment);

ViewPager左右滑动

ViewPager是一种容器，可以盛装两种类型的对象：一种是View对象； 也可以放置Fragment。

getLayoutInflater().form(this);getLayoutInflater().form(this).inflate(resource,root);

配置Adapter：

准备数据源 -> 准备适配器 ->加载适配器

List
PagerAdapter

ViewPager的声明：
是为了解决版本兼容性问题

过程

我们创建好布局文件，然后在MainActivity中添加，进行实例

准备数据源

private List viewList;

viewList = new ArrayList();

显示

View view = View.inflate(this, R.layout.view, null);

添加

viewList.add(view);

准备适配器

@Overridepublic Object instantiateItem(ViewGroup container, int position){}

搭建构造方法

public MyPagerAdapter(List viewList){    this.viewList=viewList;}

container.addview();return viewList.get(position);

container.removeView(viweList.get(position));

Adapter

创建Adapter

PagerAdapter pagerAdapter = new PagerAdapter(viewList);

setAdapter(pagerAdapter);

对象

PagerTabStrip和PagerTitleStrip

一个View显示ViewPager，然后在ViewPager中添加PagerTabStrip 

然后加入标题，private List titleList;

同理，ViewPager添加题目

titleList = new ArrayList();titleList.add("第一题")；titleList.add("第二题")；titleList.add("第三题")；titleList.add("第五题");

在加入PagerAdapter中，创建Adapter下创建，MyPagerAdapter.java

MyPagerAdapter.java

public class MyPagerAdapter extends PagerAdapter{    private List viewList;    private List titleList;    public MyPagerAdapter(List viewList, List titleList){        this.viewList=viewList;        this.titleList=titleList;    }}

加入题目数量第几题
显示标题
getPageTitle(),显示所对应的标题

@Overridepublic CharSequence getPageTitle(int position){    //return super.getPageTitle(position);    return titleList.get(position);}

PagerTabStrip的属性
背景

setBackgroundColor(Color.RED);
文本
setTextColor();
下划线
setDrawFullUnderline(false);
分割线
setTabIndicatorColor();

PagerTitleStrip 与 PagerTabStrip 类似

适配器

FragmentPagerAdapter

import android.os.Bundle;import android.support.v4.app.Fragment;public class ExercisesFragment extends Fragment {    private ListView lvList;//来源fragment    private ListItemAdapter adapter; //适配器    private List<> ebl; //列表集合    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment, null);    }    @Override    public void onViewCreated(View view, Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);        initData();        lvList = view.findViewById(R.id.lv_list);        adapter = new ListItemAdapter(getActivity());        adapter.setData(ebl);        lvList.setAdapter(adapter);    }    private void initData(){        ebl = new ArrayList();        for (int i=0;i<10;i++){            Bean bean = new Bean();            bean.id=(i+1);            switch (i){                case 0:                                    case 9:                                    default:                    break;            }        }    }}

设置MyFragment继承Fragment

public class MyFragment extends Fragment{    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){        return inflater.infate(R.layout.view, container, false);        //return inflater.infate(R.layout.view, null);    }}

点击跳转Fragment

public void onClick(View v) {        switch (v.getId()){            case R.id.bottom1:                //getSupportFragmentManager().beginTransaction().add(R.id.main_body,new CFragment()).commit();                               break;            case R.id.bottom2:                //getSupportFragmentManager().beginTransaction().add(R.id.main_body,new EFragment()).commit();                                break;            case R.id.bottom3:                //getSupportFragmentManager().beginTransaction().add(R.id.main_body,new MFragment()).commit();                                break;        }    }

实例

private List fragmentList;

Fragment作为数据源

添加FragmentfragmentList = new ArrayList();fragmentList.add(new Fragment());添加创建的Fragment//fragmentList.add(new Fragment%());

导入的包

import android.support.v4.app.Fragment;

配置数据适配器

如果用FragmentPagerAdapter，一次性加载
同理

public class MyFragment extends FragmentPagerAdapter{    private List fragmentList;    private List titleList;    public MyFragment(FragmentManager fm，List fragmentList，List titleList){        super(fm)        this.fragmentList=fragmentList;        this.titleList=titleList;    }}

MainActivity.java

public class MainActivity extends FragmentActivity implements View.OnClickListener{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    private void setMain() {           }    private void setSelectStatus(int index) {        switch (index){                   }    }    private void initView() {            }    @Override    public void onClick(View v) {        switch (v.getId()){                            //getSupportFragmentManager().beginTransaction().add(R.id.main_body,new CourseFragment()).commit();                            //getSupportFragmentManager().beginTransaction().add(R.id.main_body,new ExercisesFragment()).commit();                            //getSupportFragmentManager().beginTransaction().add(R.id.main_body,new MyinfoFragment()).commit();        }    }}

FragmentPagerAdapter adapter=new FragmentPagerAdapter(getSupportFragmentManager());

轮播图

ViewFlipper

自动播放

静态的方法导入：

动态导入：

flipper = findViewById(R.id.flipper);
flipper.addView(getImageView(R.drawable.picture));

自己定义动态效果，一般用anim的文件夹表示：

然后创建布局界面：
创建轮播图

MainActivity.java

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }}

声明变量

private ViewFlipper flipper;

进行初始化

flipper = findViewById(R.id.flipper);

动态导入：addView(getImageView(R.drawable.picture));

轮播图有多张图片，创建数组，分别导入

获取图片

private ImageView getImageView(int imageId){    ImageView image = new ImageView(this);    image.setImageResource(imageId);    return image;}

for(int i=0; i

@Overridepublic boolean onTouchEvent(MotionEvent event){    return super.onTouchEvent(event);}

flipper.setFlipInterval(3000);flipper.startFlipping();

tv.setText(getResources().getString(R.string.content));

scroll.setOnTouchListener(new OnTouchListener){}

布局 老样子

ArrayAdapter adapter;SimpleAdapter adapter;

private int[] images;public ImageAdapter(int []images){    this.images = images;}

private Context context;public ImageAdapter(int[] images, Context context){    this.images = images;    this.context = context;}

{    //ImageView image=new ImageView(this);    ImageView image = new ImageView(context);    image.setBackgroundResource(数组[position]);    //设置图片大小    image.setLayoutParams(new Gallery.LayoutParams(400,300));    return image;}

gallery.setAdapter(adapter);

public View makeView(){    }

public View makeView(){    ImageView image = new ImageView(this);    return image;}