知识点
- 俩种退出程序的方法
- 复制集合
- 同步的用法
- 字符数组
- 工厂模式，生产fatgment，解决了碎片重复创建的问题
- 全局上下文
- actionbar用法
- fargmentadapter，当viewpager里是fargment的话更方便
1.抽取BaseActivity 管理所有activity 方便退出
public class BaseActivity extends ActionBarActivity {// 管理运行的所有的activitypublic final static List<BaseActivity> mActivities = new LinkedList<BaseActivity>();//增删快//使用广播也可以，如果当前Activity想退出可以，sendReceiver // private KillAllReceiver receiver; // private class KillAllReceiver extends BroadcastReceiver{ // // @Override // public void onReceive(Context context, Intent intent) { // finish(); // } // }@Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); // receiver=new KillAllReceiver(); // IntentFilter filter=new IntentFilter("com.itheima.google.killall"); // registerReceiver(receiver, filter);//解决同步问题，不可以添加的时候删除synchronized (mActivities) {mActivities.add(this);}init();//定义几个方法子类去实现，代码不臃肿，这个是初始化view前的操作initView();initActionBar();}@Overrideprotected void onDestroy() {super.onDestroy();synchronized (mActivities) {mActivities.remove(this);} // if(receiver!=null){ // unregisterReceiver(receiver); // receiver=null; // }}public void killAll() {// 复制了一份mActivities 集合，因为不能在操作mActivities 的时候去遍历，就是这样复制的List<BaseActivity> copy;synchronized (mActivities) {copy = new LinkedList<BaseActivity>(mActivities);}for (BaseActivity activity : copy) {activity.finish();}// 杀死当前的进程android.os.Process.killProcess(android.os.Process.myPid());}protected void initActionBar() {}protected void initView() {}protected void init() {} }
2.MainActivity
public class MainActivity extends BaseActivity implementsOnQueryTextListener {private DrawerLayout mDrawerLayout;private ActionBarDrawerToggle drawerToggle;private ViewPager mViewPager;private PagerTabStrip pager_tab_strip;private String[] tab_names; // 标签的名字@Overrideprotected void initActionBar() {ActionBar actionBar = getSupportActionBar();actionBar.setDisplayHomeAsUpEnabled(true);actionBar.setHomeButtonEnabled(true);drawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, R.drawable.ic_drawer_am, R.string.open_drawer,R.string.close_drawer){@Overridepublic void onDrawerClosed(View drawerView) {super.onDrawerClosed(drawerView);Toast.makeText(getApplicationContext(), "抽屉关闭了", 0).show();}@Overridepublic void onDrawerOpened(View drawerView) {super.onDrawerOpened(drawerView);Toast.makeText(getApplicationContext(), "抽屉打开了", 0).show();}};mDrawerLayout.setDrawerListener(drawerToggle);// 让开关和actionbar建立关系 drawerToggle.syncState();}@Overrideprotected void init() {tab_names = UiUtils.getStringArray(R.array.tab_names);}@Overrideprotected void initView() {setContentView(R.layout.activity_main);mDrawerLayout = (DrawerLayout) findViewById(R.id.dl);mViewPager=(ViewPager) findViewById(R.id.vp);pager_tab_strip=(PagerTabStrip) findViewById(R.id.pager_tab_strip);// 设置标签下划线的颜色pager_tab_strip.setTabIndicatorColor(getResources().getColor(R.color.indicatorcolor));mViewPager.setAdapter(new MainAdpater(getSupportFragmentManager()));//sendBroadcast(new Intent("com.itheima.google.killall"));//Log.i(tag, msg)}private class MainAdpater extends FragmentStatePagerAdapter{public MainAdpater(FragmentManager fm) {super(fm);}// 每个条目返回的fragment// 0@Overridepublic Fragment getItem(int position) {// 通过Fragment工厂 生产Fragment return FragmentFactory.createFragment(position);}// 一共有几个条目 @Overridepublic int getCount() {return tab_names.length;}// 返回每个条目的标题@Overridepublic CharSequence getPageTitle(int position) {return tab_names[position];}}@SuppressLint("NewApi")@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main, menu);// 如果运行的环境 (部署到什么版本的手机 )大于3.0if (android.os.Build.VERSION.SDK_INT > 11) {SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();searchView.setOnQueryTextListener(this);// 搜索的监听} return true;}/** 处理actionBar菜单条目的点击事件 */public boolean onOptionsItemSelected(MenuItem item) {if (item.getItemId() == R.id.action_search) {Toast.makeText(getApplicationContext(), "搜索", 0).show();}return drawerToggle.onOptionsItemSelected(item)|super.onOptionsItemSelected(item);}// 当搜索提交的时候@Overridepublic boolean onQueryTextSubmit(String query) {Toast.makeText(getApplicationContext(), query, 0).show();return true;}// 当搜索的文本发生变化@Overridepublic boolean onQueryTextChange(String newText) {return true;}
}
3.UiUtils
public class UiUtils {/*** 获取到字符数组 * @param tabNames 字符数组的id*/public static String[] getStringArray(int tabNames) {return getResource().getStringArray(tabNames);}public static Resources getResource() {return BaseApplication.getApplication().getResources();}/** dip转换px */public static int dip2px(int dip) {final float scale = getResource().getDisplayMetrics().density;return (int) (dip * scale + 0.5f);}/** pxz转换dip */public static int px2dip(int px) {final float scale = getResource().getDisplayMetrics().density;return (int) (px / scale + 0.5f);} }
这样定义数组：string.xml里
<string-array name="tab_names"><item>首页</item><item>应用</item><item>游戏</item><item>专题</item><item>分类</item><item>排行</item></string-array>
4.FragmentFactory
public class FragmentFactory {private static Map<Integer, Fragment> mFragments = new HashMap<Integer, Fragment>();public static Fragment createFragment(int position) {Fragment fragment = null;fragment = mFragments.get(position); //在集合中取出来Fragmentif (fragment == null) { //如果再集合中没有取出来 需要重新创建if (position == 0) {fragment = new HomeFragment();} else if (position == 1) {fragment = new AppFragment();} else if (position == 2) {fragment = new GameFragment();} else if (position == 3) {fragment = new SubjectFragment();} else if (position == 4) {fragment = new CategoryFragment();} else if (position == 5) {fragment = new TopFragment();}if (fragment != null) {mFragments.put(position, fragment);// 把创建好的Fragment存放到集合中缓存起来}}return fragment;} }
通过这样获取上下文
/*** 代表当前应用程序* @author itcast**/
public class BaseApplication extends Application {private static BaseApplication application;@Overridepublic void onCreate() {super.onCreate();application=this;}public static Context getApplication() {return application;}
}
