Adnroid 自定义ProgressDialog加载中(加载圈)

public class Loading_view extends ProgressDialog {  public Loading_view(Context context) {    super(context);  }  public Loading_view(Context context, int theme) {    super(context, theme);  }  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    init(getContext());  }  private void init(Context context) {    setCancelable(true);    setCanceledOnTouchOutside(false);    setContentView(R.layout.loading);//loading的xml文件    WindowManager.LayoutParams params = getWindow().getAttributes();    params.width = WindowManager.LayoutParams.WRAP_CONTENT;    params.height = WindowManager.LayoutParams.WRAP_CONTENT;    getWindow().setAttributes(params);  }  @Override  public void show() {//开启    super.show();  }  @Override  public void dismiss() {//关闭    super.dismiss();  }}