timg.jpg
在我们日常开发当中你一定为无缘无故的内存泄漏而烦恼，或者因为多个Activity互相跳转而烦恼，这时候我们就需要一个利器-ActManager.有了这个帮助类我们就可以省去静态去写一些activity启动模式了。
设置Actmanager为静态变量:
因为我们全局只需要一个Actmaanager,所有我们把它设置为静态变量,放在静态区域.
private static ActManager instance = new ActManager();
public static ActManager Instance() {
return instance;
}
设置保护重复跳转
/**
* 防止页面短时间重复跳转
*
* @return true:可以跳转 false:不跳转
*/
private boolean checkForward(Context context) {
Activity activity = null;
boolean flag = true;
try {
activity = (Activity) context;
} catch (Exception e) {
Logger.output("Warning!!! ApplicationContext");
//说明是ApplicationContext
}
long time = Calendar.getInstance().getTimeInMillis();
if (null != activity) {
if (null != lastAct) {
//如果是相同activity,并且在150ms内跳转多次,则屏蔽多次跳转
if (time - lastForwardTime < 150 && activity == lastAct) {
flag = false;
}
}
}
lastForwardTime = time;
lastAct = activity;
return flag;
}
设置基础跳转方法
intent 跳转
/**
* 跳转至下一页面--intent跳转
* 可以调系统相册等
* @param packageContext context
* @param intent intent
*/
public void forwardActivity(Context packageContext, Intent intent) {
if (checkForward(packageContext)) {
packageContext.startActivity(intent);
}
}
指定类名跳转
/**
* 跳转至下一页面
*
* @param packageContext context
* @param cls class
*/
public void forwardActivity(Context packageContext, Class<?> cls) {
if (checkForward(packageContext)) {
Intent intent = new Intent(packageContext, cls);
packageContext.startActivity(intent);
}
}
带参数跳转,这个参数可以是String,int,long,double,boolean 我只举一个String的例子
/**
* 跳转至下一页面， 传递 String参数
*/
public void forwardActivity(Context packageContext, Class<?> cls, String key, String extra) {
if (checkForward(packageContext)) {
Intent intent = new Intent(packageContext, cls);
intent.putExtra(key, extra);
packageContext.startActivity(intent);
}
}
获取当前activity
/**
* 获取当前的 activity
*
* @return act
*/
public Activity currentActivity() {
if (activityStack == null || activityStack.isEmpty()) {
return null;
}
return activityStack.lastElement();
}
Activity入栈,一般放在Base类的onCreate()方法里
/**
* 将该 activity 入画面栈
*
* @param activity act
*/
public void pushActivity(Activity activity) {
if (activityStack == null) {
activityStack = new Stack<>();
}
if (activityStack.contains(activity)) {
activityStack.remove(activity);
}
activityStack.add(activity);
}
返回上一个activity,相当于finish,并且这里做了一个防止空指针的保护
/**
* 返回上一个 activity
*/
public void popActivity() {
if (activityStack == null) {
activityStack = new Stack<>();
return;
}
if (activityStack.isEmpty()) {
return;
}
Activity activity = activityStack.pop();
if (activity != null) {
if (!activity.isFinishing())
activity.finish();
}
}
高级跳转
返回上一个activity,并且上一个类的类名不为参数传过来的类名，一般在注册界面使用，就是说你注册成功之后，自动登录，调用这个方法后不会返回到登录页面。
/**
* 返回上一个 activity，并且上一个activity不为指定类名activity,否则继续pop
*/
public void popActivity(Class<?> cls) {
popActivity();
if (isCurrentActivity(cls)) {
popActivity();
}
}
弹出activity 栈中的指定activity对象
/**
* 弹出画面栈中的某一个 activity
*
* @param activity 要弹出的 activity 对象
*/
public void popActivity(Activity activity) {
if (activityStack == null) {
activityStack = new Stack<>();
}
if (activityStack.isEmpty()) {
return;
}
if (activity != null) {
activityStack.remove(activity);
if (!activity.isFinishing())
activity.finish();
}
}
清空activity栈，仅仅保留一个activit,一般用于快速回到首页，或者捕获异常时不退出app，而是跳转首页。
/**
* 弹出所有画面栈，仅保留某一个 activity
*
* @param cls 要保留的 activity 类
*/
public void popAllActivityExceptOne(Class<?> cls) {
while (true) {
Activity activity = currentActivity();
if (activity == null) {
break;
}
if (activity.getClass().equals(cls)) {
break;
}
popActivity(activity);
}
}
在程序退出的时候清空一下activity栈
/**
* 清空画面栈，退出程序
*/
public void popAllActivity() {
//MobclickAgent.onKillProcess(currentActivity());//可以在这里加入友盟统计事件
while (true) {
Activity activity = currentActivity();
if (activity == null) {
break;
}
popActivity(activity);
}
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(0);
}
代码帮助类
有一些不常用的方法我就不一一赘述了，下面我会把整个Actmanager类的代码贴出来，需要的尽管拿去，大家又不懂的可以在评论区向我提问。
Github链接--https://github.com/EspressoToast/BaseTest
package com.example.ljw.basedemo;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import java.util.Calendar;
import java.util.Stack;
public class ActManager {
private static Stack<Activity> activityStack;
private static ActManager instance = new ActManager();
private long lastForwardTime = 0;
private Activity lastAct = null;
private ActManager() {
}
public static ActManager Instance() {
return instance;
}
/**
* 防止页面短时间重复跳转
*
* @return true:可以跳转 false:不跳转
*/
private boolean checkForward(Context context) {
Activity activity = null;
boolean flag = true;
try {
activity = (Activity) context;
} catch (Exception e) {
Logger.output("Warning!!! ApplicationContext");
//说明是ApplicationContext
}
long time = Calendar.getInstance().getTimeInMillis();
if (null != activity) {
if (null != lastAct) {
//如果是相同activity,并且在150ms内跳转多次,则屏蔽多次跳转
if (time - lastForwardTime < 150 && activity == lastAct) {
flag = false;
}
}
}
lastForwardTime = time;
lastAct = activity;
return flag;
}
/**
* 跳转至下一页面
*
* @param packageContext context
* @param intent intent
*/
public void forwardActivity(Context packageContext, Intent intent) {
if (checkForward(packageContext)) {
packageContext.startActivity(intent);
}
}
/**
* 跳转至下一页面
*
* @param packageContext context
* @param cls class
*/
public void forwardActivity(Context packageContext, Class<?> cls) {
if (checkForward(packageContext)) {
Intent intent = new Intent(packageContext, cls);
packageContext.startActivity(intent);
}
}
/**
* 跳转至下一页面， 传递 String参数
*/
public void forwardActivity(Context packageContext, Class<?> cls, String key, String extra) {
if (checkForward(packageContext)) {
Intent intent = new Intent(packageContext, cls);
intent.putExtra(key, extra);
packageContext.startActivity(intent);
}
}
/**
* 跳转至下一页面， 传递 int 参数
*/
public void forwardActivity(Context packageContext, Class<?> cls, String key, int extra) {
if (checkForward(packageContext)) {
Intent intent = new Intent(packageContext, cls);
intent.putExtra(key, extra);
packageContext.startActivity(intent);
}
}
/**
* 跳转至下一页面， 传递 long 参数
*/
public void forwardActivity(Context packageContext, Class<?> cls, String key, long extra) {
if (checkForward(packageContext)) {
Intent intent = new Intent(packageContext, cls);
intent.putExtra(key, extra);
packageContext.startActivity(intent);
}
}
/**
* 跳转至下一页面， 传递 double 参数
*/
public void forwardActivity(Context packageContext, Class<?> cls, String key, double extra) {
if (checkForward(packageContext)) {
Intent intent = new Intent(packageContext, cls);
intent.putExtra(key, extra);
packageContext.startActivity(intent);
}
}
/**
* 跳转至下一页面， 传递 boolean 参数
*/
public void forwardActivity(Context packageContext, Class<?> cls, String key, boolean extra) {
if (checkForward(packageContext)) {
Intent intent = new Intent(packageContext, cls);
intent.putExtra(key, extra);
packageContext.startActivity(intent);
}
}
/**
* 将该 activity 入画面栈
*
* @param activity act
*/
public void pushActivity(Activity activity) {
if (activityStack == null) {
activityStack = new Stack<>();
}
if (activityStack.contains(activity)) {
activityStack.remove(activity);
}
activityStack.add(activity);
}
/**
* 返回上一个 activity
*/
public void popActivity() {
if (activityStack == null) {
activityStack = new Stack<>();
return;
}
if (activityStack.isEmpty()) {
return;
}
Activity activity = activityStack.pop();
if (activity != null) {
if (!activity.isFinishing())
activity.finish();
}
}
/**
* 返回上一个 activity，并且上一个activity不为指定类名activity,否则继续pop
*/
public void popActivity(Class<?> cls) {
popActivity();
if (isCurrentActivity(cls)) {
popActivity();
}
}
/**
* 根据类名判断是否是当前activity
*/
private boolean isCurrentActivity(Class<?> cls) {
Activity currentActivity = currentActivity();
if (null == currentActivity) {
return false;
}
if (currentActivity.getClass().equals(cls)) {
return true;
}
return false;
}
/**
* 结束指定类名的Activity
*/
public void finishActivity(Class<?> cls) {
for (Activity activity : activityStack) {
if (activity.getClass().equals(cls)) {
popActivity(activity);
}
}
}
/**
* 弹出画面栈中的某一个 activity
*
* @param activity 要弹出的 activity 对象
*/
public void popActivity(Activity activity) {
if (activityStack == null) {
activityStack = new Stack<>();
}
if (activityStack.isEmpty()) {
return;
}
if (activity != null) {
activityStack.remove(activity);
if (!activity.isFinishing())
activity.finish();
}
}
/**
* 获取当前的 activity
*
* @return act
*/
public Activity currentActivity() {
if (activityStack == null || activityStack.isEmpty()) {
return null;
}
return activityStack.lastElement();
}
/**
* 清空画面栈，退出程序
*/
public void popAllActivity() {
while (true) {
Activity activity = currentActivity();
if (activity == null) {
break;
}
popActivity(activity);
}
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(0);
}
/**
* 清空画面栈，并且进入某一个页面
*/
public void popAllActivityNoExit() {
while (true) {
Activity activityTemp = currentActivity();
if (activityTemp == null) {
break;
}
popActivity(activityTemp);
}
}
/**
* 返回到指定 activity
*
* @param cls 指定的activity
*/
public void backToActivity(Class<?> cls) {
while (true) {
Activity activity = currentActivity();
if (activity == null) {
break;
}
if (activity.getClass().equals(cls)) {
return;
}
popActivity(activity);
}
}
/**
* 弹出所有画面栈，仅保留某一个 activity
*
* @param cls 要保留的 activity 类
*/
public void popAllActivityExceptOne(Class<?> cls) {
while (true) {
Activity activity = currentActivity();
if (activity == null) {
break;
}
if (activity.getClass().equals(cls)) {
break;
}
popActivity(activity);
}
}
/**
* 判断画面栈中是否存在该 activity 对象
*
* @param activity act
* @return 存在返回TRUE ，不存在返回FALSE
*/
public boolean existActivity(Activity activity) {
if (activityStack == null) {
activityStack = new Stack<>();
}
return !activityStack.isEmpty() && activityStack.contains(activity);
}
public boolean hasOtherActivity(Activity activity) {
if (null == activityStack || activityStack.isEmpty()) {
return false;
}
if (activityStack.size() > 1) {
return true;
} else if (activityStack.size() == 1) {
return !activityStack.contains(activity);
}
return false;
}
}
下一篇预告--Android 项目开发必备-Utils类的建立与使用
网友评论