Android退出整个应用程序

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import java.util.LinkedList; import java.util.List; import android.app.Activity; import android.app.AlertDialog; import android.app.Application; import android.content.DialogInterface; import android.content.Intent;  public class SysApplication extends Application{     private List<Activity> mList = new LinkedList<Activity>();     private static SysApplication instance;      private SysApplication(){       }         public synchronized static SysApplication getInstance(){         if(null == instance){             instance = new SysApplication();         }         return instance;     }     public void addActivity(Activity activity){// add Activity          mList.add(activity);     }      public void exit(){         try{             for(Activity activity : mList){                 if (activity != null)  //注意这里判断null                    activity.finish();             }         }catch (Exception e) {             e.printStackTrace();         }finally {             System.exit(0);         }     }         public void onLowMemory() {         super.onLowMemory();             System.gc();     }  }

Activity 加入

public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main) ;SysApplication.getInstance().addActivity(this) ; }

退出

public void Leavedialog(){          AlertDialog.Builder builder = new Builder(MainActivity.this);          builder.setMessage("确定要退出吗?");          builder.setTitle("提示");          builder.setPositiveButton("确认",          new android.content.DialogInterface.OnClickListener() {              @Override              public void onClick(DialogInterface dialog, int which) {                  dialog.dismiss();                  SysApplication.getInstance().exit() ;            }          }        );          builder.setNegativeButton("取消",          new android.content.DialogInterface.OnClickListener() {              @Override              public void onClick(DialogInterface dialog, int which) {                  dialog.dismiss();              }        }        );          builder.create().show();  }

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