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解决办法：

@Override    protected void onDestroy() {        super.onDestroy();        if (alertDialog1 != null)            alertDialog1.dismiss();    }

2、在onSaveInstanceState方法，在activity销毁前，判断dialog是否显示，如果显示设置一个标识，代码

@Override    protected void onSaveInstanceState(Bundle outState) {        super.onSaveInstanceState(outState);        if (alertDialog1 != null && alertDialog1.isShowing())            outState.putBoolean("FLAG", true);    }

3、在onRestoreInstanceState方法，显示dialog，代码

@Override    protected void onRestoreInstanceState(Bundle savedInstanceState) {        super.onRestoreInstanceState(savedInstanceState);            boolean dialog_shown = savedInstanceState.getBoolean("FLAG");            if (dialog_shown){                showDialog();}    }

这样AlertDialog，不会泄露也不会切换屏幕后消失

附：showDialog方法

private void showDialog() {        AlertDialog.Builder alertDialog = new AlertDialog.Builder(this)                .setTitle("对话框")                .setMessage("正在加载哟...")                .setNegativeButton("取消", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        Toast.makeText(getApplicationContext(), "cancle", Toast.LENGTH_SHORT).show();                    }                })                .setPositiveButton("确定", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        Toast.makeText(getApplicationContext(), "sure", Toast.LENGTH_SHORT).show();                    }                });        alertDialog1 = alertDialog.create();        alertDialog1.show();    }

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