Android UI篇——DialogFragment系列二之Dialog封装

《DialogFragment系列一之源码分析》
《DialogFragment系列二之Dialog封装》
《DialogFragment系列三之AlertDialog实现》
《DialogFragment系列四之StatusDialog(Progress、Success、Error)实现》
《DialogFragment系列五之ItemDialog(eg:BottomDialog)实现》
《DialogFragment系列六之常见问题》

上篇文章《DialogFragment系列一之源码分析》中分析了DialogFragment的优点并通过源码进行了说明，此篇要基于DialogFragment封装一个Dialog来初步替代原生Android中的Dialog，下面通过代码来展示：

public class Dialog extends AppCompatDialogFragment implements View.OnClickListener {
    private DialogParams dialogParams;

    public Dialog() {
        this.dialogParams = new DialogParams();
    }

    protected void show(AppCompatActivity activity, String tag) {
        if (!TextUtils.isEmpty(tag)) {
            show(activity.getSupportFragmentManager(), tag);
        } else {
            show(activity);
        }
    }


    protected void show(AppCompatActivity activity) {
        show(activity.getSupportFragmentManager(), activity.getClass().getSimpleName());
    }

    @Nullable
    @Override
    public final View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //getDialog().setCancelable(setCancelable());
        getDialog().setCanceledOnTouchOutside(setCancelable());
        setCancelable(setCancelable());
        //设置背景透明
        getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        return super.onCreateView(inflater, container, savedInstanceState);
    }


    protected boolean setCancelable() {
        return dialogParams.isCancelable;
    }

    @NonNull
    @Override
    public final android.app.Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        View dialogLayout = LayoutInflater.from(getContext()).inflate(setLayoutRes(), null);
        builder.setView(dialogLayout);
        onViewCreated(dialogLayout, null);
        return builder.create();
    }

    protected int setLayoutRes() {
        return dialogParams.contentView;
    }

    @Override
    public void onClick(View v) {

    }

    public class DialogParams {
        AppCompatActivity activity;
        int style;
        int animations;
        int contentView;
        String tag;
        boolean isCancelable;
    }

    public static class Builder {
        private DialogParams P;
        private Dialog dialog;

        private Builder(AppCompatActivity activity) {
            dialog = new Dialog();
            P = dialog.dialogParams;
            P.activity = activity;
        }

        public Builder setStyle(int val) {
            P.style = val;
            return this;
        }

        public Builder setAnimations(int val) {
            P.animations = val;
            return this;
        }

        public Builder setContentView(@LayoutRes int val) {
            P.contentView = val;
            return this;
        }

        public Builder setCancelable(boolean val) {
            P.isCancelable = val;
            return this;
        }

        public Dialog build() {
            if (P.contentView == -1) {
                throw new IllegalArgumentException("Please set setContentView");
            }
            dialog.show(P.activity, P.tag);
            return dialog;
        }
    }

}

Dialog采用构造者模式，简化了DialogFragment的show()方法，封装了Dialog的实现，并预留了扩展性接口，开发者可以通过重写setLayoutRes()来实现不同布局，通过onViewCreated()来为布局控件赋值、设置监听等。

笔者基于Dialog实现了《Dialog全家桶》，先来看下部分实现效果：

AlertDialog.png

具体实现请看
《DialogFragment系列三之AlertDialog实现》
《DialogFragment系列四之StatusDialog(Progress、Success、Error)实现》

读者有问或其他观点请留言交流，共同进步！

源码Github传送门，觉得不错就给个star吧，谢谢！