如何为导航和当前设置返回选项 activity

Question

我创建了一个带有列表视图的应用程序，当我从主页单击后退按钮时，它会显示一条消息并询问是否退出。在我实现导航抽屉并设置打开和关闭之后。但是当我从导航中单击后退按钮时，返回并弹出我设置为 hoe 页面的吐司。

@Override
public void onBackPressed() {

    if (drawerLayout.isDrawerOpen(GravityCompat.START)){
        drawerLayout.closeDrawer(GravityCompat.START);
    }else{
        super.onBackPressed();
    }

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("Are you sure you want to Exit?")
            .setCancelable(false)
            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    finish();
                    AdminHome.super.onBackPressed();
                }
            })

            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });

    AlertDialog alertDialog = builder.create();
    alertDialog.show();
}

当我从导航栏单击返回并从主页设置吐司时，如何停止吐司消息。

Answer 1

将 AlertDialog 代码放在 else 块中。

Answer 2

您好，您可以这样更改代码

@Override
public void onBackPressed() {

if (drawerLayout.isDrawerOpen(GravityCompat.START)){
    drawerLayout.closeDrawer(GravityCompat.START);
}else{
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to Exit?")
        .setCancelable(false)
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                finish();
                AdminHome.super.onBackPressed();
            }
        })

        .setNegativeButton("No", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

AlertDialog alertDialog = builder.create();
alertDialog.show();
}

}

Answer 3

将您的警报对话框放入您的条件 else 中

@Override
public void onBackPressed() {

    if (drawerLayout.isDrawerOpen(GravityCompat.START)){
        drawerLayout.closeDrawer(GravityCompat.START);
    }else{
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage("Are you sure you want to Exit?")
            .setCancelable(false)
            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    super.onBackPressed();
                }
            })

            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });

           AlertDialog alertDialog = builder.create();
           alertDialog.show();
    }

}

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