DialogFragment使用Bulider设计模式

最新推荐文章于 2023-06-28 07:00:00 发布

原创最新推荐文章于 2023-06-28 07:00:00 发布 · 518 阅读

1 ·

CC 4.0 BY-SA版权

android 专栏收录该内容

41 篇文章

订阅专栏

这篇博客通过一个练习Demo详细介绍了如何运用Builder设计模式来实现DialogFragment。内容包括DialogFragment的布局设计、点击回调接口的实现、DialogFragment的具体实现以及如何在应用中调用它。同时，文中还提及了V4包与app包中Fragment的相关操作。

这是练习Demo,主要是学习Bulider设计模式，代码规范不标准

1.DialogFragment的布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="@color/color_bg">
    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="20dp"
        android:textSize="18sp"
        android:textColor="@color/color_title"
        android:background="@color/color_msg"
        android:gravity="center"
        android:text="标题"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"/>

    <TextView
        android:id="@+id/msg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="20dp"
        android:text="信息"
        android:textColor="@color/color_msg"
        android:textSize="16sp"
        android:background="@color/color_bg"
        app:layout_constraintTop_toBottomOf="@+id/title"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"/>

    <TextView
        android:id="@+id/small_msg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="10dp"
        android:text="固定信息1"
        android:textColor="@color/colot_tip"
        android:textSize="14sp"
        android:background="@color/color_bg"
        app:layout_constraintTop_toBottomOf="@+id/msg"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />


    <TextView
        android:id="@+id/tip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="10dp"
        android:text="可隐藏信息"
        android:textColor="@color/color_title"
        android:background="@color/color_bg"
        android:textSize="14sp"
        app:layout_constraintTop_toBottomOf="@+id/small_msg"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"/>

    <TextView
        android:id="@+id/divider"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/colot_tip"
        app:layout_constraintTop_toBottomOf="@+id/tip"/>

    <Button
        android:id="@+id/left_btn"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@color/color_bg"
        android:layout_marginTop="1dp"
        android:text="确定"
        app:layout_constraintTop_toBottomOf="@+id/divider"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintRight_toLeftOf="@id/certen_btn"
        />
    <Button
        android:id="@+id/certen_btn"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="1dp"
        android:text="取消"
        android:background="@drawable/gray_left_border_rect"
        app:layout_constraintTop_toBottomOf="@+id/divider"
        app:layout_constraintLeft_toRightOf="@id/left_btn"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintRight_toLeftOf="@id/right_btn"
        />
    <Button
        android:id="@+id/right_btn"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="1dp"
        android:text="详情"
        android:background="@drawable/gray_left_border_rect"
        app:layout_constraintTop_toBottomOf="@+id/divider"
        app:layout_constraintLeft_toRightOf="@id/certen_btn"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintHorizontal_weight="1"
        />

</android.support.constraint.ConstraintLayout>

2.DiagFragment的点击回调接口

public interface OnDialogButtonClickListener<T> {
   void setOnClickListener(T result);
}

3.DiagFragment的实现

public class CustomerDialogFragment extends DialogFragment {

    private static final String TITLE="title";
    private static final String MESSAGE="msg";
    private static final String SMALLMSG="small_msg";
    private static final String TIP="tip";
    private static final String LEFTBUTTON="left_btn";
    private static final String CENTERBUTTON="center_btn";
    private static final String RIGHTBUTTON="right_btn";


    private OnDialogButtonClickListener dialogButtonClickListener;


    private static CustomerDialogFragment newInstance(Builder builder){
        CustomerDialogFragment customerDialogFragment=new CustomerDialogFragment();
        Bundle bundle=new Bundle();
        bundle.putString(TITLE,builder.title);
        bundle.putString(MESSAGE,builder.msg);
        bundle.putString(SMALLMSG,builder.smallMsg);
        bundle.putString(TIP,builder.tip);
        bundle.putString(LEFTBUTTON,builder.btnLeft);
        bundle.putString(CENTERBUTTON,builder.btnCenter);
        bundle.putString(RIGHTBUTTON,builder.btnRight);
        customerDialogFragment.setArguments(bundle);
        return customerDialogFragment;
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
       
        //无标题
        getDialog().requestWindowFeature(STYLE_NO_TITLE);
        // 透明背景
        getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
     
        View view=inflater.inflate(R.layout.dialog_fragment,container,false);

        TextView title=view.findViewById(R.id.title);
        TextView divider=view.findViewById(R.id.divider);
        String mtitle=getArguments().getString(TITLE);
        if (TextUtils.isEmpty(mtitle)){
            title.setVisibility(View.INVISIBLE);
            divider.setVisibility(View.VISIBLE);
        }else {
            title.setVisibility(View.VISIBLE);
            divider.setVisibility(View.GONE);
            title.setText(mtitle);
        }

        TextView msg=view.findViewById(R.id.msg);
        if (!TextUtils.isEmpty(getArguments().getString(MESSAGE))){
            msg.setText(getArguments().getString(MESSAGE));
        }

        TextView small_msg=view.findViewById(R.id.small_msg);
        if (!TextUtils.isEmpty(getArguments().getString(SMALLMSG))){
            small_msg.setText(getArguments().getString(SMALLMSG));
        }

        TextView tip=view.findViewById(R.id.tip);
        String mtip=getArguments().getString(TIP);
        if (TextUtils.isEmpty(mtip)){
            tip.setVisibility(View.INVISIBLE);
        }else {
            tip.setVisibility(View.VISIBLE);
            tip.setText(mtip);
        }


        Button leftBtn=view.findViewById(R.id.left_btn);
        String mleftBtn=getArguments().getString(LEFTBUTTON);
        if (TextUtils.isEmpty(mleftBtn)){
            leftBtn.setVisibility(View.GONE);
        }else {
            leftBtn.setVisibility(View.VISIBLE);
            leftBtn.setText(mleftBtn);
            leftBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (dialogButtonClickListener!=null){
                        dialogButtonClickListener.setOnClickListener(0);
                    }
                }
            });
        }

        Button rightBtn=view.findViewById(R.id.right_btn);
        String mrightBtn=getArguments().getString(RIGHTBUTTON);
        if (TextUtils.isEmpty(mrightBtn)){
            rightBtn.setVisibility(View.GONE);
        }else {
            rightBtn.setVisibility(View.VISIBLE);
            rightBtn.setText(mrightBtn);
            rightBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (dialogButtonClickListener!=null){
                        dialogButtonClickListener.setOnClickListener(1);
                    }
                }
            });
        }


        Button centerBtn=view.findViewById(R.id.certen_btn);
        String mcenterBtn=getArguments().getString(CENTERBUTTON);
        if (TextUtils.isEmpty(mcenterBtn)){
            centerBtn.setVisibility(View.GONE);
        }else {
            centerBtn.setVisibility(View.VISIBLE);
            centerBtn.setText(mcenterBtn);
            centerBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (dialogButtonClickListener!=null){
                        dialogButtonClickListener.setOnClickListener(2);
                    }
                }
            });
        }
        return view;
    }

    public CustomerDialogFragment setOnDialogResultListener(OnDialogButtonClickListener onDialogResultListener){
        this.dialogButtonClickListener=onDialogResultListener;
        return this;
    }

    public static Builder newCostomerBuilder(){
        return new Builder();
    }

    public static class Builder {
        CustomerDialogFragment customerDialogFragment;
        private String title;
        private String msg;
        private String smallMsg;
        private String tip;
        private String btnLeft;
        private String btnCenter;
        private String btnRight;

        public Builder setTitle(String title) {
            this.title = title;
            return this;
        }

        public Builder setMsg(String msg) {
            this.msg = msg;
            return this;
        }

        public Builder setSmallMsg(String smallMsg) {
            this.smallMsg = smallMsg;
            return this;
        }

        public Builder setTip(String tip) {
            this.tip = tip;
            return this;
        }

        public Builder setBtnLeft(String btnLeft) {
            this.btnLeft = btnLeft;
            return this;
        }

        public Builder setBtnCenter(String btnCenter) {
            this.btnCenter = btnCenter;
            return this;
        }

        public Builder setBtnRight(String btnRight) {
            this.btnRight = btnRight;
            return this;
        }

        public CustomerDialogFragment build(){
            if (customerDialogFragment==null){
                customerDialogFragment=CustomerDialogFragment.newInstance(this);
            }
            return customerDialogFragment;
        }
    }

    @Override
    public void onDismiss(DialogInterface dialog) {
        super.onDismiss(dialog);
        getActivity().finish();
    }
}

4.调用DialogFragment

CustomerDialogFragment
        .newCostomerBuilder()
        .setTitle("提示")
        .setMsg("这是一个对话框")
        .setSmallMsg("注意：这是一个对话框")
        .setTip("注意：这是一个对话框")
        .build()
        .show(getSupportFragmentManager(),"dialog");

==================================================题外=============================================

这个是V4包的Fragment的关闭方法

Fragment prev = getSupportFragmentManager().findFragmentByTag("dialog");
    if (prev != null) {
        DialogFragment df = (DialogFragment) prev;
        df.dismiss();
    }

这个是app包的Fragment的创建

FragmentTransaction mFragTransaction = getFragmentManager().beginTransaction();
Fragment fragment =  getFragmentManager().findFragmentByTag("dialog");
if(fragment!=null){
    //为了不重复显示dialog，在显示对话框之前移除正在显示的对话框
    mFragTransaction.remove(fragment);
}
CustomerDialogFragment dialogFragment = new CustomerDialogFragment();
//显示一个Fragment并且给该Fragment添加一个Tag，可通过findFragmentByTag找到该Fragment
dialogFragment.show(mFragTransaction, "dialog");

要在onStop或onDestroy中关闭DialogFragment

if (dialog != null && dialog.isShowing()) {
    dialog.dismiss();
}