android常用封装 －－－ BaseActivity

public abstract class BaseActivity extends Activity {
/**
* 记录处于前台的Activity
*/
private static BaseActivity mForegroundActivity = null;
/**
* 记录所有活动的Activity
*/
private static final List<BaseActivity> mActivities = new LinkedList<BaseActivity>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initView();
initFindViewById();
initData();
initEvent();

// initActionBar();
}

@Override
protected void onResume() {
mForegroundActivity = this;
super.onResume();
}

@Override
protected void onPause() {
mForegroundActivity = null;
super.onPause();
}

abstract protected void initView();

abstract protected void initData();

protected void initActionBar() {

}

/**
* 关闭所有Activity
*/
public static void finishAll() {
List<BaseActivity> copy;
synchronized (mActivities) {
copy = new ArrayList<BaseActivity>(mActivities);
}
for (BaseActivity activity : copy) {
activity.finish();
}
}

/**
* 关闭所有Activity，除了参数传递的Activity
*/
public static void finishAll(BaseActivity except) {
List<BaseActivity> copy;
synchronized (mActivities) {
copy = new ArrayList<BaseActivity>(mActivities);
}
for (BaseActivity activity : copy) {
if (activity != except)
activity.finish();
}
}

/**
* 是否有启动的Activity
*/
public static boolean hasActivity() {
return mActivities.size() > 0;
}

/**
* 获取当前处于前台的activity
*/
public static BaseActivity getForegroundActivity() {
return mForegroundActivity;
}

/**
* 获取当前处于栈顶的activity，无论其是否处于前台
*/
public static BaseActivity getCurrentActivity() {
List<BaseActivity> copy;
synchronized (mActivities) {
copy = new ArrayList<BaseActivity>(mActivities);
}
if (copy.size() > 0) {
return copy.get(copy.size() - 1);
}
return null;
}

protected void initFindViewById() {

}

protected void initEvent() {

}

/**
* 退出应用
*/
public void exitApp() {
finishAll();
android.os.Process.killProcess(android.os.Process.myPid());
}
}