Android 点击两次返回键退出程序 正确代码
import java.util.Timer;import java.util.TimerTask;import android.app.Activity;import android.widget.Toast;public class BaseActivity extends Activity {private static Boolean isExit = false;Timer tExit = new Timer();TimerTask task;@Overridepublic void onBackPressed() {if (isExit == false) {isExit = true;Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();task = new TimerTask() {@Overridepublic void run() {isExit = false;}};tExit.schedule(task, 2000);} else {finish();System.exit(0);}};}

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转钱请注明：http://androidmaster.iteye.com/blog/1894574