关于
好久没有更新文章了，感觉该写点什么了。就简单点的啦，这次分享一个Activity管理工具，轻松关闭想关闭的页面。写这个的原因也是因为，在当前页面需要关闭上一个页面或其他之前打开的页面。其实网上也有很多的办法，比如static修饰，比如Application、队列管理等等，感比较麻烦，不注意容易内存泄漏。所以自己搞了一个管理类，只需要在Application中的onCreate方法中初始化一次，就OK了，剩下的就是你要关哪个页面了。
演示
还是先来个GIF图演示一下吧
操作
- 初始化
自定义Application，在onCreate中添加XActivityManager.addActivityListener(this);
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
XActivityManager.addActivityListener(this);
}
}
- 怎么用？
假如说当前有Activity：MainActivity、OneActivity、TwoActivity、ThreeActivity、FourActivity、FiveActivity
- 当你在
ThreeActivity关闭TwoActivity：
XActivityManager.getInstance().finishActivityByName(TwoActivity.class);
- 当你在
FourActivity想关闭所有Activity排除MainActivity
XActivityManager.getInstance().finishAllExceptThisActivity(MainActivity.class);
实现思路
代码在下面大家可以先看一看
- 代码的主要思路在于添加了关于Application对Activity的监听，当监听到有Activity运行是则添加到Map中，如果Activity销毁则从Map中删除。
- 用Map管理，是方便与通过名字就可以finish掉Activity。
- 由于可能造成内存泄漏，Map添加的是含有Activity的WeakReference。
- 通过方法传入Activity的class，然后获取Activity名字，通过Map的key得到Activity。
代码
import android.app.Activity;
import android.app.Application;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.Map;
public class XActivityManager {
private static XActivityManager sInstance = new XActivityManager();
private WeakReference<Activity> sCurrentActivityWeakRef;
private Map<String, WeakReference<Activity>> mAllActivity;
private XActivityManager() {
mAllActivity = new HashMap<>();
}
public static XActivityManager getInstance() {
return sInstance;
}
/**
* 获取当前Activity
* @return
*/
public Activity getCurrentActivity() {
Activity currentActivity = null;
if (sCurrentActivityWeakRef != null) {
currentActivity = sCurrentActivityWeakRef.get();
}
return currentActivity;
}
private void setCurrentActivity(Activity activity) {
sCurrentActivityWeakRef = new WeakReference<>(activity);
mAllActivity.put(activity.getClass().getSimpleName(), sCurrentActivityWeakRef);
for (Map.Entry<String, WeakReference<Activity>> entry :
mAllActivity.entrySet()) {
WeakReference<Activity> wr = entry.getValue();
if (wr.get() == null) continue;
Log.i("XActivityManager", "当前活动Activity:" + wr.get().getClass().getSimpleName());
}
Log.i("XActivityManager", "---------------------------------------");
}
private void removeThisActivity(Activity activity) {
mAllActivity.remove(activity.getClass().getSimpleName());
}
/**
* 通过Activity 名字干掉这个Activity
*
* @param activityClass
*/
public void finishActivityByName(Class<? extends Activity> activityClass) {
WeakReference<Activity> wr = mAllActivity.get(activityClass.getSimpleName());
if (wr == null) return;
Activity activity = wr.get();
if (
activity == null
|| activity.isFinishing()
|| (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1 && activity.isDestroyed())
)
return;
activity.finish();
}
/**
* 干掉所有的activity排除这个Activity
*/
public void finishAllExceptThisActivity(Class<? extends Activity> activityClass) {
for (Map.Entry<String, WeakReference<Activity>> entry :
mAllActivity.entrySet()) {
WeakReference<Activity> wr = entry.getValue();
if (
wr.get() == null
|| wr.get().isFinishing()
|| (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1 && wr.get().isDestroyed())
|| entry.getKey().equals(activityClass.getSimpleName())
)
continue;
wr.get().finish();
}
}
/**
* 添加对Activity的监听
*/
public static void addActivityListener(Application app) {
app.registerActivityLifecycleCallbacks(new Application.ActivityLifecycleCallbacks() {
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityResumed(Activity activity) {
XActivityManager.getInstance().setCurrentActivity(activity);
}
@Override
public void onActivityPaused(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
XActivityManager.getInstance().removeThisActivity(activity);
}
});
}
}
END
