摘要：
有两种方法可以退出程序：复制集合同步的用法、字符数组工厂模式和生成fatgage。这解决了重复创建片段的问题。全局上下文是actionbar用法，fargetadapper。当可视寻呼机在远处时更方便。1.提取BaseActivity以管理所有活动，这便于退出publicclassBaseActivityextendsActionBarActivity｛//管理所有正在运行的活动
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activity public 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(); } @Override protected 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 implements
OnQueryTextListener {
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle drawerToggle;
private ViewPager mViewPager;
private PagerTabStrip pager_tab_strip;
private String[] tab_names; // 标签的名字
@Override
protected 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){
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
Toast.makeText(getApplicationContext(), "抽屉关闭了", 0).show();
}
@Override
public 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();
}
@Override
protected void init() {
tab_names = UiUtils.getStringArray(R.array.tab_names);
}
@Override
protected 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
@Override
public Fragment getItem(int position) {
// 通过Fragment工厂 生产Fragment
return FragmentFactory.createFragment(position);
}
// 一共有几个条目
@Override
public int getCount() {
return tab_names.length;
}
// 返回每个条目的标题
@Override
public CharSequence getPageTitle(int position) {
return tab_names[position];
}
}
@SuppressLint("NewApi")
@Override
public 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3.0
if (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
@Override
public boolean onQueryTextSubmit(String query) {
Toast.makeText(getApplicationContext(), query, 0).show();
return true;
}
// 当搜索的文本发生变化
@Override
public 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Fragment if (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;
@Override
public void onCreate() {
super.onCreate();
application=this;
}
public static Context getApplication() {
return application;
}
}