今天在网上看见个博客关于退出整个程序的，感觉不错，拿来分享学习

SysApplication这个类复制到工程里面，然后在每个Acitivity的oncreate方法里面通过SysApplication.getInstance().addActivity(this); 添加当前Acitivity到ancivitylist里面去，*后在想退出的时候调用SysApplication.getInstance().exit();可直接关闭所有的Acitivity并退出应用程序。

  1. import java.util.LinkedList;
  2. import java.util.List;
  3. import android.app.Activity;
  4. import android.app.AlertDialog;
  5. import android.app.Application;
  6. import android.content.DialogInterface;
  7. import android.content.Intent;
  9. public class SysApplication extends Application {
  10. private List mList = new LinkedList();
  11. private static SysApplication instance;
  13. private SysApplication() {
  14. }
  15. public synchronized static SysApplication getInstance() {
  16. if (null == instance) {
  17. instance = new SysApplication();
  18. }
  19. return instance;
  20. }
  21. // add Activity
  22. public void addActivity(Activity activity) {
  23. mList.add(activity);
  24. }
  26. public void exit() {
  27. try {
  28. for (Activity activity : mList) {
  29. if (activity != null)
  30. activity.finish();
  31. }
  32. } catch (Exception e) {
  33. e.printStackTrace();
  34. } finally {
  35. System.exit(0);
  36. }
  37. }
  38. public void onLowMemory() {
  39. super.onLowMemory();
  40. System.gc();
  41. }
  42. }

在应用程序里面 的activity的oncreate里面添加SysApplication.getInstance().addActivity(this)
如：

  1. public void onCreate(Bundle savedInstanceState)
  2. {
  3. super.onCreate(savedInstanceState);
  4. setContentView(R.layout.main);
  5. SysApplication.getInstance().addActivity(this);
  6. }