如何在android中一次完成多个活动？

Question

我的 Activity 流程像这样 ACTIVITY A -> ACTIVITY B -> ACTIVITY C -> ACTIVITY D。当用户在 Activity D 上并单击一个名为 exit 的按钮时，应用程序应该返回到 Activity B 并完成活动 C 和 D。我该怎么做？

注意：活动 B 和活动 D 是同一个类但不同的实例

Answer 1

在AndroidManifest.xml中，Activity B、C、D设置android:noHistory为true，ActivityA设置为false（其实默认为false )。

演示：

<activity android:name=".xx.xx.ActivityA" 
    android:noHistory="false"
    android:screenOrientation="nosensor">
</activity>

<activity android:name=".xx.xx.ActivityB" 
    android:noHistory="true"
    android:screenOrientation="nosensor">
</activity>        

<activity android:name=".xx.xx.ActivityC" 
    android:noHistory="true"
    android:screenOrientation="nosensor">
</activity>

<activity android:name=".xx.xx.ActivityD" 
    android:noHistory="true"
    android:screenOrientation="nosensor">
</activity>

退出Button：

exitBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(getApplicationContext(),ActivityB.class);
        startActivity(intent);
        finish();
    }
});

Answer 2

相当复杂的解决方案，但允许完全操作 backstack。基本上在你Application中创建你自己的“backstack”：

public class MyApplication extends Application {

    private Set<Activity> runningActivities = new HashSet<>();

    onCreate() {
        // ...
        registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
            @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
                runningActivities.add(activity);
            }
            @Override public void onActivityDestroyed(Activity activity) {
                runningActivities.remove(activity);
            }
        });
    }

    public void killActivities(Set<Class<?>> activitiesToRemove) {
        for (Activity stackActivity : runningActivities) {
            if (activitiesToRemove.contains(stackActivity.getClass())) {
                stackActivity.finish();
            }
        }
    }
}

现在您可以在 ActivityD 中调用类似的内容：

((MyApplication)getApplication()).killActivities(ActivityD.class, ActivityC.class)

如果 class 不仅是确定应删除哪个活动所必需的说明符，则可以使用 Map 而不是 Set...

如果我的解决方案有问题，请纠正我，但您的活动中似乎不应该有泄漏和样板

编辑 - Kotlin 版本：

class MyApplication : Application() {

    private val runningActivities = mutableSetOf<Activity>()

    
    override fun onCreate() {
        // ...
        registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {
            override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle) {
                runningActivities.add(activity)
            }
            override fun onActivityDestroyed(activity: Activity) {
                runningActivities.remove(activity)
            }
        })
    }

    fun killActivities(activitiesToRemove: Set<Class<Activity>>) {
        runningActivities.forEach { activity ->
            if (activitiesToRemove.contains(activity.javaClass)) {
                activity.finish()
            }
        }
    }
}

Answer 3

只需将其添加到您的 ActivityD.class 中

 finishButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getApplicationContext(),ActivityB.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent);

            finish();

        }
    });

希望对你有帮助！

Answer 4

When you back from activity D and go to activity A then you need to use these code.
 1. First create the instance of all activity using this code.

Activity A{

}

Activity B{
public static Activity activityB;

oncreate(){
activityB=this;
}
Activity C{
public static Activity activityC;

oncreate(){
activityC=this;
}

Activity D{

}

2. Please call this method on back press in Activity D

private finishActivity(){
Clear the instance of middle activity.
 B.activityB.finish();
 C.activityC.finish();
  finish();
}

Answer 5

实现这一点的最佳和完整证明方法是创建扩展 android.app.Application 的 Application 类，并在那里维护您打开的 Activity 实例的列表。

接下来是在 AndroidManifest.xml 中的<application> 中提及您创建的应用程序类名称

然后你可以随时销毁打开的活动。