android - 如何更改 Android 对话框或抽屉菜单中的黑色

Question

在 Android 中，当我们显示警告对话框、进度对话框、打开抽屉等内容时，屏幕上似乎有一个透明的黑色层，然后是一种对话框，如下图:

我的目标是改变透明的黑色层，而不是对话框的背景，看这张图:

如何将这个透明黑色层的颜色更改为红色或任何颜色？例如在 XML 中或通过 java 中的代码

这是我的 MyExitDialog 类的代码

public class MyExitDialog extends Dialog implements android.view.View.OnClickListener
{
    DatabaseHandler userDB;

    public Activity c;
    public Dialog d;
    public Button yes, no;

    public MyExitDialog(Activity a)
    {
        super(a);
        this.c = a;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.mydialog);
        yes = (Button) findViewById(R.id.id_exit_yes);
        no = (Button) findViewById(R.id.id_exit_no);
        yes.setOnClickListener(this);
        no.setOnClickListener(this);
    }

    @Override
    public void onClick(View v)
    {
        switch (v.getId()) {
            case R.id.id_exit_yes:
                //c.finish();
                DrawerActivity.userDB=new DatabaseHandler(MyExitDialog.this.getContext());
                DrawerActivity.userDB.open();
                DrawerActivity.userDB.logOut();
                DrawerActivity.userDB.close();
                DrawerActivity.changeDrawerItems("logout");
                break;
            case R.id.id_exit_no:
                dismiss();
                break;
            default:
                break;
        }
        dismiss();

    }
}

这就是我使用它的方式:

@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.

    int id = item.getItemId();
    Fragment myFragment = null;

    View myView;
    Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/BYekan.ttf");

    if (id == R.id.nav_home) {

    } else if (id == R.id.nav_register) {


    } else if (id == R.id.nav_change) {

    } else if (id == R.id.nav_login) {

    } else if (id == R.id.nav_factors) {

    } else if (id == R.id.nav_logout) {
        MyExitDialog myDialog = new MyExitDialog(DrawerActivity.this);
        myDialog.show();
    }
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

Answer 1

要更改抽屉覆盖背景:

yourDrawerLayout.setScrimColor(Color.RED)