1 public class ActivityCollector{
 2     public static List<Activity> activities = new ArrayList<>();
 3     public static void addActivity(Activity activity){
 4         activities.add(activity);
 5     }
 6     public static void removeActivity(Acitivity activity){
 7         activities.remove(acitivity);
 8     }
 9     public static void finishAll(){
10         for(Activity activity: activities){
11             if(!activity.isFinishing()){
12                 activity.finish();
13             }
14         }
15     }
16 }

1 public class SecondActivity extends BaseActivity{
2     public static void actionStart(Context context,String data1,String data2){
3         Intent intent = new Intent(context,SecondActivity.class);
4         intent.putExtra("param1","data1");
5         intent.putExtra("param2","data2");
6         context.startActivity(intent);
7     }
8 ......
9 }

public void onClick(View v){SecondActivity.actionStart(FirstAcitivity.this,"data1","data2");
}

/** * 退出应用程序 */
public void AppExit(Context context) {  try {  ActivityCollector.finishAll();  ActivityManager activityMgr = (ActivityManager) context  .getSystemService(Context.ACTIVITY_SERVICE);  activityMgr.killBackgroundProcesses(context.getPackageName());  System.exit(0);  } catch (Exception ignored) {}
}  

// 定义一个变量，来标识是否退出
private static boolean isExit = false;
Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);isExit = false;}
};public boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) {if (!isExit) {isExit = true;Toast.makeText(getApplicationContext(), "再按一次退出程序",Toast.LENGTH_SHORT).show();// 利用handler延迟发送更改状态信息mHandler.sendEmptyMessageDelayed(0, 2000);} else {exit(this);}return false;}
return super.onKeyDown(keyCode, event);}

/保存点击的时间
private long exitTime = 0;
public boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) {if ((System.currentTimeMillis() - exitTime) > 2000) {Toast.makeText(getApplicationContext(), "再按一次退出程序",Toast.LENGTH_SHORT).show();exitTime = System.currentTimeMillis();} else {exit();}return false;}return super.onKeyDown(keyCode, event);
}