个性化Dialog小图标

个性化Dialog小图标，主要代码如下:
@

Override
    protected void onCreate(Bundle savedInstanceState) {
        // Be sure to call the super class.
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_LEFT_ICON);

        // See assets/res/any/layout/dialog_activity.xml for this
        // view layout definition, which is being set here as
        // the content of our screen.
        setContentView(R.layout.dialog_activity);

        getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
                android.R.drawable.ic_dialog_alert);
    }

1、申请设置个性化小图标，需在 setContentView(R.layout.dialog_activity) 之前调用。

requestWindowFeature(Window.FEATURE_LEFT_ICON);

2、设置小图标

getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,
                android.R.drawable.ic_dialog_alert);