Android自定义仿ios加载弹窗

public class IosLoadDialog extends Dialog {

    public IosLoadDialog(Context context) {
        super(context, R.style.loading_dialog);
        initView();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode){
            case KeyEvent.KEYCODE_BACK:
                if(IosLoadDialog.this.isShowing())
                    IosLoadDialog.this.dismiss();
                break;
        }
        return true;
    }


    private void initView(){
        setContentView(R.layout.dialog_loading);
        Animation animation = AnimationUtils.loadAnimation(getContext(), R.anim.load_animation);
        animation.setInterpolator(new LinearInterpolator());
        findViewById(R.id.loading_dialog_img).startAnimation(animation);

        setCanceledOnTouchOutside(true);
        WindowManager.LayoutParams attributes = getWindow().getAttributes();
        attributes.alpha=0.8f;
        getWindow().setAttributes(attributes);
        setCancelable(false);
    }
}

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public void showDialog(){
        final IosLoadDialog iosLoadDialog = new IosLoadDialog(this);
        iosLoadDialog.show();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                iosLoadDialog.dismiss();
            }
        },1200);
    }