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Android模拟强制下线通知功能实例代码

2019年07月24日  | 移动技术网移动技术  | 我要评论

这里写图片描述
这里写图片描述

package com.itheima74.broadcastbestpractice;
import android.content.intent;
import android.os.bundle;
import android.os.systemclock;
import android.support.v4.content.localbroadcastmanager;
import android.view.view;
/**
 * 模拟强制下线通知
 * 1.登录成功后10秒发送一条本地自定义无序广播
 * 2.接收到广播后弹出对话框(不可取消)
 * 3.点击对话框确定按钮重新返回登陆界面
 */
public class mainactivity extends baseactivity {
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    // 启动一个子线程,10秒发送一条本地无序广播
    new thread(new runnable() {
      @override
      public void run() {
        systemclock.sleep(1000 * 10);
        localbroadcastmanager localbroadcastmanager = localbroadcastmanager.getinstance(getapplicationcontext());
        localbroadcastmanager.sendbroadcast(new intent("com.itheima74.broadcastbestpractice.force_offline"));
      }
    }).start();
  }
  // 点击按钮,启动main2activity
  public void click(view view) {
    startactivity(new intent(this, main2activity.class));
  }
}
package com.itheima74.broadcastbestpractice;
import android.content.intent;
import android.os.bundle;
import android.support.annotation.nullable;
import android.support.v7.app.appcompatactivity;
import android.view.view;
import android.widget.edittext;
import android.widget.toast;
/**
 * created by my on 2017/3/6.
 */
public class loginactivity extends appcompatactivity {
  private edittext et_username;
  private edittext et_password;
  @override
  protected void oncreate(@nullable bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_login);
    et_username = (edittext) findviewbyid(r.id.et_username);
    et_password = (edittext) findviewbyid(r.id.et_password);
  }
  // 点击按钮,进行登录
  public void login(view view) {
    string username = et_username.gettext().tostring().trim();
    string password = et_password.gettext().tostring().trim();
    if ("admin".equals(username) && "123456".equals(password)) {
      toast.maketext(this, "login success", toast.length_short).show();
      startactivity(new intent(this, mainactivity.class));
    } else {
      toast.maketext(this, "login fail", toast.length_short).show();
    }
  }
}
package com.itheima74.broadcastbestpractice;
import android.app.alertdialog;
import android.content.broadcastreceiver;
import android.content.context;
import android.content.dialoginterface;
import android.content.intent;
import android.content.intentfilter;
import android.os.bundle;
import android.support.annotation.nullable;
import android.support.v4.content.localbroadcastmanager;
import android.support.v7.app.appcompatactivity;
import android.util.log;
import java.util.arraylist;
/**
 * baseactivity
 * 1.记录所有新创建的activity
 * 2.随时销毁所有activity
 * 3.所有子类获取焦点注册广播接收者,失去焦点取消注册
 * 4.收到强制下线广播,弹出对话框,结束所有activity,重新启动loginactivity
 * created by my on 2017/3/6.
 */
public class baseactivity extends appcompatactivity {
  protected static arraylist<baseactivity> activitylist = new arraylist<>();
  private localbroadcastmanager localbroadcastmanager;
  private offlinereceiver offlinereceiver;
  private intentfilter intentfilter;
  @override
  protected void oncreate(@nullable bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    activitylist.add(this);
    log.d("china", getclass().getsimplename() + " oncreate activitylist.size():" + activitylist.size());
    localbroadcastmanager = localbroadcastmanager.getinstance(this);
    offlinereceiver = new offlinereceiver();
    intentfilter = new intentfilter("com.itheima74.broadcastbestpractice.force_offline");
  }
  @override
  protected void ondestroy() {
    super.ondestroy();
    activitylist.remove(this);
    log.d("china", getclass().getsimplename() + " ondestroy activitylist.size():" + activitylist.size());
  }
  // 获取焦点,注册广播接收者
  @override
  protected void onresume() {
    super.onresume();
    localbroadcastmanager.registerreceiver(offlinereceiver, intentfilter);
  }
  // 失去焦点,取消注册广播接收者
  @override
  protected void onpause() {
    super.onpause();
    localbroadcastmanager.unregisterreceiver(offlinereceiver);
  }
  protected class offlinereceiver extends broadcastreceiver {
    @override
    public void onreceive(final context context, intent intent) {
      // 弹出对话框
      alertdialog.builder builder = new alertdialog.builder(baseactivity.this);
      builder.settitle("warning");
      builder.setmessage("you are force to be offline,please try to login again.");
      builder.setcancelable(false);// 不允许back键取消
      builder.setpositivebutton("ok", new dialoginterface.onclicklistener() {
        @override
        public void onclick(dialoginterface dialog, int which) {
          baseactivity.finishall();
          // 重新启动loginactivity,广播接收者中需要添加任务栈
          intent intent = new intent(context, loginactivity.class);
          intent.addflags(intent.flag_activity_new_task);
          context.startactivity(intent);
        }
      });
      builder.show();
    }
  }
  public static void finishall() {
    for (baseactivity baseactivity : activitylist) {
      if (!baseactivity.isfinishing()) {
        baseactivity.finish();
      }
    }
  }
}

以上所述是小编给大家介绍的android模拟强制下线通知功能实例代码，希望对大家有所帮助

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