import java.util.LinkedList;
import java.util.List;
import android.app.Activity;
import android.app.AlertDvxialog;
import android.app.Application;
import android.content.DialogInterface;
import android.content.Intent;
public class SysApplication extends Application {
private List mList = new LinkedList();
private static SysApplication instance;
private SysApplication() {
}
public synchronized static SysApplication getInstance() {
if (null == instance) {
instance = new SysApplication();
}
return instance;
}
// add Activity
public void addActivity(Activity activity) {
mList.add(activity);
}
public void exit() {
try {
for (Activity activity : mList) {
if (activity != null)
activity.finish();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
System.exit(0);
}
}
public void onLowMemory() {
super.onLowMemory();
System.gc();
}
}
//在应用程序里面 的activity的oncreate里面添加SysApplication.getInstance().addActivity(this),如：
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
SysApplication.getInstance().addActivity(this);
}
//最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。
