做项目的时候,涉及到一个注销登录的过程,这时候需要关闭之前打开的所有Activity。仅finish当前Activity显然是不够的,需要把返回栈中的Activity一个个销毁。我实践过的方法有两种:
1、基础类BaseActivity中注册广播接收器,接受关闭所有Activity的广播
2、基础类BaseActivity中将Activity加入一个集合中,并提供一个静态finishAll的方法统一关闭
备注:App中所有Activity直接或间接继承自BaseActivity。
一、使用广播接收器发送统一销毁广播
ExitAppReceiver 广播接收器代码:
public class ExitAppReceiver extendsBroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals("exit_app")){
if (context != null){
if (context instanceofActivity){
((Activity)context).finish();
}
if (context instanceofService){
((Service)context).stopSelf();
}
}
}
}
}
BaseActivity中注册销毁广播接收器:
public class BaseActivity extendsAppCompatActivity {
private static final String TAG = "BaseActivity";
private ExitAppReceiver exitAppReceiver;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
registerExitAppReceiver();//注册
}
@Override
protected void onDestroy() {
super.onDestroy();
unRegisterExitAppReceiver();//销毁
}
private void registerExitAppReceiver(){
IntentFilter filter = new IntentFilter();
filter.addAction("exit_app");
exitAppReceiver = new ExitAppReceiver();
registerReceiver(exitAppReceiver, filter);
}
private void unRegisterExitAppReceiver(){
unregisterReceiver(exitAppReceiver);
}
}
发送关闭所有Activity广播:
Intent intent = new Intent("exit_app");
sendBroadcast(intent);
二、采用ActivityCollector(方法参考郭霖《第一行代码》第2版)
ActivityCollector源码
public class ActivityCollector {
public static List<Activity> list = new ArrayList<>();
public static void addActivity(Activity activity){
list.add(activity);
}
public static void removeActivity(Activity activity){
list.remove(activity);
}
public static void finishAllActivity(){
for (Activity activity :list) {
if (!activity.isFinishing()){
activity.finish();
}
}
}
}
在BaseActivity中添加和移除:
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityCollector.addActivity(this);
}
@Override
protected void onDestroy() {
super.onDestroy();
ActivityCollector.removeActivity(this);
}
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