Android标准图标资源在哪里

Java
import Android.app.Activity;
import Android.os.Bundle;
import Android.widget.ImageView;
public class MAInActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setcontentView(R.layout.activity_mAIn);
        // 获取ImageView控件
        ImageView imageView = findViewById(R.id.imageView);
        // 设置图标资源
        imageView.setImageResource(Android.R.drawable.ic_dialog_alert);
    }
}