為什么要做activity的管理
在android app的開(kāi)發(fā)過(guò)程中，或多或少會(huì)涉及到activity的管理。會(huì)有這樣的業(yè)務(wù)場(chǎng)景存在，例如：
- 廣播接收器接收到某個(gè)動(dòng)作，需要finish某個(gè)指定的activity；
- 在缺乏activity上下文的地方也需要finish某個(gè)指定的activity......
話不多說(shuō)，上代碼。
1. AppManager.java
/**
* ProjectName：AndroidUtil
* PackageName: com.standard.util.helper
* Description：自定義activity的棧管理(棧結(jié)構(gòu)擴(kuò)展Vector，元素不要求唯一性，可存在多個(gè)相同實(shí)例)
* <p>
* CreateTime: 6/24/2016 12:36
* Modifier：liminghuang
* ModifyTime：6/24/2016 12:36
* Comment：因?yàn)榈谝话姹続ppManager的使用過(guò)程中發(fā)現(xiàn)存在問(wèn)題，所以為了保持api的一致性，采用橋接模式委托AppManagerDelegate類處理
*
* @author liminghuang
*/
public final class AppManager {
/** 是否使用橋接模式 **/
private boolean isBridge = false;
/** AppManager管理activity的委托類 **/
private AppManagerDelegate mDelegate;
/** 維護(hù)activity的棧結(jié)構(gòu) **/
private Stack<Activity> mActivityStack;
private static volatile AppManager sInstance;
/**
* 隱藏構(gòu)造器
*
* @param isBridge 是否開(kāi)啟橋接模式
*/
private AppManager(boolean isBridge) {
this.isBridge = isBridge;
mDelegate = AppManagerDelegate.getInstance();
}
/**
* 單例
*
* @return 返回AppManager的單例
*/
public static AppManager getInstance() {
if (sInstance == null) {
synchronized (AppManager.class) {
if (sInstance == null) {
sInstance = new AppManager(true);
}
}
}
return sInstance;
}
/**
* 添加Activity到堆棧
*
* @param activity activity實(shí)例
*/
public void addActivity(Activity activity) {
if (isBridge) {
mDelegate.addActivity(activity);
} else {
if (mActivityStack == null) {
mActivityStack = new Stack<>();
}
mActivityStack.add(activity);
}
}
/**
* 獲取當(dāng)前Activity（棧中最后一個(gè)壓入的）
*
* @return 當(dāng)前（棧頂）activity
*/
public Activity currentActivity() {
if (isBridge) {
return mDelegate.currentActivity();
} else {
if (mActivityStack != null && !mActivityStack.isEmpty()) {
return mActivityStack.lastElement();
}
return null;
}
}
/**
* 結(jié)束除當(dāng)前activtiy以外的所有activity
* 注意：不能使用foreach遍歷并發(fā)刪除，會(huì)拋出java.util.ConcurrentModificationException的異常
*
* @param activity 不需要結(jié)束的activity
*/
public void finishOtherActivity(Activity activity) {
if (isBridge) {
mDelegate.finishOtherActivity(activity);
} else {
if (mActivityStack != null) {
for (Iterator<Activity> it = mActivityStack.iterator(); it.hasNext(); ) {
Activity temp = it.next();
if (temp != null && temp != activity) {
finishActivity(temp);
}
}
}
}
}
/**
* 結(jié)束除這一類activtiy以外的所有activity
* 注意：不能使用foreach遍歷并發(fā)刪除，會(huì)拋出java.util.ConcurrentModificationException的異常
*
* @param cls 不需要結(jié)束的activity
*/
public void finishOtherActivity(Class<?> cls) {
if (isBridge) {
mDelegate.finishOtherActivity(cls);
} else {
if (mActivityStack != null) {
for (Iterator<Activity> it = mActivityStack.iterator(); it.hasNext(); ) {
Activity activity = it.next();
if (!activity.getClass().equals(cls)) {
finishActivity(activity);
}
}
}
}
}
/**
* 結(jié)束當(dāng)前Activity（堆棧中最后一個(gè)壓入的）
*/
public void finishActivity() {
if (isBridge) {
mDelegate.finishActivity();
} else {
if (mActivityStack != null && !mActivityStack.isEmpty()) {
Activity activity = mActivityStack.lastElement();
finishActivity(activity);
}
}
}
/**
* 結(jié)束指定的Activity
*
* @param activity 指定的activity實(shí)例
*/
public void finishActivity(Activity activity) {
if (isBridge) {
mDelegate.finishActivity(activity);
} else {
if (activity != null) {
if (mActivityStack != null && mActivityStack.contains(activity)) {// 兼容未使用AppManager管理的實(shí)例
mActivityStack.remove(activity);
}
activity.finish();
}
}
}
/**
* 結(jié)束指定類名的所有Activity
*
* @param cls 指定的類的class
*/
public void finishActivity(Class<?> cls) {
if (isBridge) {
mDelegate.finishActivity(cls);
} else {
if (mActivityStack != null) {
for (Iterator<Activity> it = mActivityStack.iterator(); it.hasNext(); ) {
Activity activity = it.next();
if (activity.getClass().equals(cls)) {
finishActivity(activity);
}
}
}
}
}
/**
* 結(jié)束所有Activity
*/
public void finishAllActivity() {
if (isBridge) {
mDelegate.finishAllActivity();
} else {
if (mActivityStack != null) {
for (int i = 0, size = mActivityStack.size(); i < size; i++) {
if (null != mActivityStack.get(i)) {
mActivityStack.get(i).finish();
}
}
mActivityStack.clear();
}
}
}
/**
* 退出應(yīng)用程序
*/
public void exitApp() {
if (isBridge) {
mDelegate.exitApp();
} else {
try {
finishAllActivity();
// 退出JVM(java虛擬機(jī)),釋放所占內(nèi)存資源,0表示正常退出(非0的都為異常退出)
System.exit(0);
// 從操作系統(tǒng)中結(jié)束掉當(dāng)前程序的進(jìn)程
android.os.Process.killProcess(android.os.Process.myPid());
} catch (Exception e) {
LogUtil.e("Exit exception", e);
}
}
}
}
2. AppManagerDelegate.java
/**
* ProjectName：AndroidUtil
* PackageName: com.standard.util.helper
* Description：自定義activity的棧管理(棧結(jié)構(gòu)擴(kuò)展Vector，元素不要求唯一性，可存在多個(gè)相同實(shí)例)
* <p>
* CreateTime: 6/24/2016 12:36
* Modifier：liminghuang
* ModifyTime：6/24/2016 12:36
* Comment：
*
* @author liminghuang
*/
public final class AppManagerDelegate {
// 使用弱引用是因?yàn)榇嬖谖词褂肁ppManager的finish方法來(lái)釋放的activity，但mActivityStack并未斷開(kāi)對(duì)其應(yīng)用導(dǎo)致內(nèi)存泄露的問(wèn)題
private Stack<WeakReference<Activity>> mActivityStack;
private static volatile AppManagerDelegate sInstance;
private AppManagerDelegate() {
}
/**
* 單例
*
* @return 返回AppManager的單例
*/
public static AppManagerDelegate getInstance() {
if (sInstance == null) {
synchronized (AppManagerDelegate.class) {
if (sInstance == null) {
sInstance = new AppManagerDelegate();
}
}
}
return sInstance;
}
/**
* 添加Activity到堆棧
*
* @param activity activity實(shí)例
*/
public void addActivity(Activity activity) {
if (mActivityStack == null) {
mActivityStack = new Stack<>();
}
mActivityStack.add(new WeakReference<>(activity));
}
/**
* 檢查弱引用是否釋放，若釋放，則從棧中清理掉該元素
*/
public void checkWeakReference() {
if (mActivityStack != null) {
for (Iterator<WeakReference<Activity>> it = mActivityStack.iterator(); it.hasNext(); ) {
WeakReference<Activity> activityReference = it.next();
Activity temp = activityReference.get();
if (temp == null) {
it.remove();// 使用迭代器來(lái)進(jìn)行安全的加鎖操作
}
}
}
}
/**
* 獲取當(dāng)前Activity（棧中最后一個(gè)壓入的）
*
* @return 當(dāng)前（棧頂）activity
*/
public Activity currentActivity() {
checkWeakReference();
if (mActivityStack != null && !mActivityStack.isEmpty()) {
return mActivityStack.lastElement().get();
}
return null;
}
/**
* 結(jié)束除當(dāng)前activtiy以外的所有activity
* 注意：不能使用foreach遍歷并發(fā)刪除，會(huì)拋出java.util.ConcurrentModificationException的異常
*
* @param activtiy 不需要結(jié)束的activity
*/
public void finishOtherActivity(Activity activtiy) {
if (mActivityStack != null && activtiy != null) {
for (Iterator<WeakReference<Activity>> it = mActivityStack.iterator(); it.hasNext(); ) {
WeakReference<Activity> activityReference = it.next();
Activity temp = activityReference.get();
if (temp == null) {// 清理掉已經(jīng)釋放的activity
it.remove();
continue;
}
if (temp != activtiy) {
it.remove();// 使用迭代器來(lái)進(jìn)行安全的加鎖操作
temp.finish();
}
}
}
}
/**
* 結(jié)束除這一類activtiy以外的所有activity
*
* @param cls 指定的某類activity
*/
public void finishOtherActivity(Class<?> cls) {
if (mActivityStack != null) {
for (Iterator<WeakReference<Activity>> it = mActivityStack.iterator(); it.hasNext(); ) {
WeakReference<Activity> activityReference = it.next();
Activity activity = activityReference.get();
if (activity == null) {// 清理掉已經(jīng)釋放的activity
it.remove();
continue;
}
if (!activity.getClass().equals(cls)) {
it.remove();// 使用迭代器來(lái)進(jìn)行安全的加鎖操作
activity.finish();
}
}
}
}
/**
* 結(jié)束當(dāng)前Activity（堆棧中最后一個(gè)壓入的）
*/
public void finishActivity() {
Activity activity = currentActivity();
if (activity != null) {
finishActivity(activity);
}
}
/**
* 結(jié)束指定的Activity
*
* @param activity 指定的activity實(shí)例
*/
public void finishActivity(Activity activity) {
if (activity != null) {
for (Iterator<WeakReference<Activity>> it = mActivityStack.iterator(); it.hasNext(); ) {
WeakReference<Activity> activityReference = it.next();
Activity temp = activityReference.get();
if (temp == null) {// 清理掉已經(jīng)釋放的activity
it.remove();
continue;
}
if (temp == activity) {
it.remove();
}
}
activity.finish();
}
}
/**
* 結(jié)束指定類名的所有Activity
*
* @param cls 指定的類的class
*/
public void finishActivity(Class<?> cls) {
if (mActivityStack != null) {
for (Iterator<WeakReference<Activity>> it = mActivityStack.iterator(); it.hasNext(); ) {
WeakReference<Activity> activityReference = it.next();
Activity activity = activityReference.get();
if (activity == null) {// 清理掉已經(jīng)釋放的activity
it.remove();
continue;
}
if (activity.getClass().equals(cls)) {
it.remove();
activity.finish();
}
}
}
}
/**
* 結(jié)束所有Activity
*/
public void finishAllActivity() {
if (mActivityStack != null) {
for (Iterator<WeakReference<Activity>> it = mActivityStack.iterator(); it.hasNext(); ) {
WeakReference<Activity> activityReference = it.next();
Activity activity = activityReference.get();
if (activity != null) {
activity.finish();
}
}
mActivityStack.clear();
}
}
/**
* 退出應(yīng)用程序
*/
public void exitApp() {
try {
finishAllActivity();
// 退出JVM(java虛擬機(jī)),釋放所占內(nèi)存資源,0表示正常退出(非0的都為異常退出)
System.exit(0);
// 從操作系統(tǒng)中結(jié)束掉當(dāng)前程序的進(jìn)程
android.os.Process.killProcess(android.os.Process.myPid());
} catch (Exception e) {
LogUtil.e("Exit exception", e);
}
}
}
如何使用
- 在BaseActivity#onCreate回調(diào)中添加AppManager.getInstance().addActivity(this)
- 獲取當(dāng)前棧頂activityAppManager.getInstance().currentActivity()
- 在需要銷毀的當(dāng)前activity的地方調(diào)用AppManager.getInstance().finishActivity()
- 在需要銷毀指定類別實(shí)例的地方調(diào)用AppManager.getInstance().finishActivity(XXX.class)
- 在需要銷毀指定類別除外的其他實(shí)例的地方調(diào)用AppManager.getInstance().finishOtherActivity(XXX.class)
- 退出應(yīng)用調(diào)用AppManager.getInstance().exitApp()
