Lost and Found（结对项目）功能实现-白红宇

Lost and Found（结对项目）功能实现

阅读量：5116 次

发布时间：2019-06-13

本文共 15765 字，大约阅读时间需要 52 分钟。

Lost and Found(失物招领APP）

Lost and Found（失物招领APP）是以Bmob为基础的，参考了网上的案例。主要实现物品的发布、修改、呈现和删除。使用场景如下：用户捡到物品，打开手机软件，填写物品的招领信息（标题、描述和联系方式）；用户丢失物品，打开手机软件，填写物品的丢失信息（标题、描述和联系方式）；任何人都可以查看到失物和招领的信息列表，可以对发布的信息进行删除。该项目将使用到Bmob的以下几个功能：

1、添加数据

添加失物/招领信息到服务器中。

2、查找数据

在列表中显示所有用户发布的失物/招领信息。

3、删除数据

删除已发布的失物/招领信息。

部分界面效果如下：

进入动画主界面

失物信息界面添加失物信息界面

失物列表编辑删除

数据结构设计

失物表（Lost）
字段名	类型	描述
describe	String	失物的描述信息
phone	String	联系的手机号码
title	String	失物的标题信息

招领表（Found）
字段名	类型	描述
describe	String	招领的描述信息
phone	String	联系的手机号码
title	String	招领的标题信息

初始化SDK

Bmob为每个应用都提供了一个唯一标识，使用Bmob开发的应用都要首先使用这个Application ID”进行初始化（在前面博客中已经提到）。对应代码如下：

protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    //初始化 Bmob SDK，第一个参数为上下文，第二个参数为Application ID    Bmob.initialize(this, Constants.Bmob_APPID);    //其他代码}

Lost类和Found类

为操作Bmob的云端数据库，SDK首先需要创建数据表对应的模型类（模型类的名称必须和云端数据表的名称一致），该类需要继承自BmobObject，实现刚刚创建的数据表字段的set和get方法（系统默认字段objectId、createAt、updateAt不需要声明）。因为项目需要操作Lost表和Found表，因此需要创建Lost类和Found类。

创建失物对象

public class Lost extends BmobObject{    private String title;//标题    private String describe;//描述    private String phone;//联系手机    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getDescribe() {        return describe;    }    public void setDescribe(String describe) {        this.describe = describe;    }    public String getPhone() {        return phone;    }    public void setPhone(String phone) {        this.phone = phone;    }    }

创建招领对象

public class Found extends BmobObject {    private String title;//标题    private String describe;//描述    private String phone;//联系手机    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getDescribe() {        return describe;    }    public void setDescribe(String describe) {        this.describe = describe;    }    public String getPhone() {        return phone;    }    public void setPhone(String phone) {        this.phone = phone;    }}

添加失物/招领信息

用户填写了失物信息之后，只需要构造一个Lost实例，然后简单调用模型类的insertObject方法就可以将信息添加到云数据库中，实现代码如下:

public class AddActivity extends BaseActivity implements OnClickListener {    EditText edit_title, edit_photo, edit_describe;    Button btn_back, btn_true;    TextView tv_add;    String from = "";        String old_title = "";    String old_describe = "";    String old_phone = "";    @Override    public void setContentView() {        // TODO Auto-generated method stub        setContentView(R.layout.activity_add);    }    @Override    public void initViews() {        // TODO Auto-generated method stub        tv_add = (TextView) findViewById(R.id.tv_add);        btn_back = (Button) findViewById(R.id.btn_back);        btn_true = (Button) findViewById(R.id.btn_true);        edit_photo = (EditText) findViewById(R.id.edit_photo);        edit_describe = (EditText) findViewById(R.id.edit_describe);        edit_title = (EditText) findViewById(R.id.edit_title);    }    @Override    public void initListeners() {        // TODO Auto-generated method stub        btn_back.setOnClickListener(this);        btn_true.setOnClickListener(this);    }    @Override    public void initData() {        // TODO Auto-generated method stub        from = getIntent().getStringExtra("from");        old_title = getIntent().getStringExtra("title");        old_phone = getIntent().getStringExtra("phone");        old_describe = getIntent().getStringExtra("describe");                edit_title.setText(old_title);        edit_describe.setText(old_describe);        edit_photo.setText(old_phone);                if (from.equals("Lost")) {            tv_add.setText("添加失物信息");        } else {            tv_add.setText("添加招领信息");        }    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        if (v == btn_true) {            addByType();        } else if (v == btn_back) {            finish();        }    }    String title = "";    String describe = "";    String photo="";        /**根据类型添加失物/招领      *      */    private void addByType(){        title = edit_title.getText().toString();        describe = edit_describe.getText().toString();        photo = edit_photo.getText().toString();                if(TextUtils.isEmpty(title)){            ShowToast("请填写标题");            return;        }        if(TextUtils.isEmpty(describe)){            ShowToast("请填写描述");            return;        }        if(TextUtils.isEmpty(photo)){            ShowToast("请填写手机");            return;        }        if(from.equals("Lost")){            addLost();        }else{            addFound();        }    }    private void addLost(){        Lost lost = new Lost();        lost.setDescribe(describe);        lost.setPhone(photo);        lost.setTitle(title);        lost.save(this, new SaveListener() {                        @Override            public void onSuccess() {                // TODO Auto-generated method stub                ShowToast("失物信息添加成功!");                setResult(RESULT_OK);                finish();            }                        @Override            public void onFailure(int code, String arg0) {                // TODO Auto-generated method stub                ShowToast("添加失败:"+arg0);            }        });    }        private void addFound(){        Found found = new Found();        found.setDescribe(describe);        found.setPhone(photo);        found.setTitle(title);        found.save(this, new SaveListener() {                        @Override            public void onSuccess() {                // TODO Auto-generated method stub                ShowToast("招领信息添加成功!");                setResult(RESULT_OK);                finish();            }                        @Override            public void onFailure(int code, String arg0) {                // TODO Auto-generated method stub                ShowToast("添加失败:"+arg0);            }        });    }}

获取失物/招领列表、删除失物招领信息

项目使用到Bmob提供的最简单的查询和排序功能，直接调用BmobQuery类的findObjects方法和order方法来获取失物列表。从云数据库中删除某条记录需要设置这个要删除的ObjectId的信息，再调用模型类的deleteObject方法就可以了，实现代码如下

public class MainActivity extends BaseActivity implements OnClickListener,        IPopupItemClick, OnItemLongClickListener {    RelativeLayout layout_action;//    LinearLayout layout_all;    TextView tv_lost;    ListView listview;    Button btn_add;    protected QuickAdapter
     
       LostAdapter;// 失物    protected QuickAdapter
      
        FoundAdapter;// 招领    private Button layout_found;    private Button layout_lost;    PopupWindow morePop;    RelativeLayout progress;    LinearLayout layout_no;    TextView tv_no;    @Override    public void setContentView() {        // TODO Auto-generated method stub        setContentView(R.layout.activity_main);    }    @Override    public void initViews() {        // TODO Auto-generated method stub        progress = (RelativeLayout) findViewById(R.id.progress);        layout_no = (LinearLayout) findViewById(R.id.layout_no);        tv_no = (TextView) findViewById(R.id.tv_no);        layout_action = (RelativeLayout) findViewById(R.id.layout_action);        layout_all = (LinearLayout) findViewById(R.id.layout_all);        // 默认是失物界面        tv_lost = (TextView) findViewById(R.id.tv_lost);        tv_lost.setTag("lost");        listview = (ListView) findViewById(R.id.list_lost);        btn_add = (Button) findViewById(R.id.btn_add);        // 初始化长按弹窗        initEditPop();    }    @Override    public void initListeners() {        // TODO Auto-generated method stub        listview.setOnItemLongClickListener(this);        btn_add.setOnClickListener(this);        layout_all.setOnClickListener(this);    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        if (v == layout_all) {            showListPop();        } else if (v == btn_add) {            Intent intent = new Intent(this, AddActivity.class);            intent.putExtra("from", tv_lost.getTag().toString());            startActivityForResult(intent, Constants.REQUESTCODE_ADD);        } else if (v == layout_found) {            changeTextView(v);            morePop.dismiss();            queryFounds();        } else if (v == layout_lost) {            changeTextView(v);            morePop.dismiss();            queryLosts();        }    }    @Override    public void initData() {        // TODO Auto-generated method stub        if (LostAdapter == null) {            LostAdapter = new QuickAdapter
       
        (this, R.layout.item_list) {                @Override                protected void convert(BaseAdapterHelper helper, Lost lost) {                    helper.setText(tv_title, lost.getTitle())                            .setText(tv_describe, lost.getDescribe())                            .setText(tv_time, lost.getCreatedAt())                            .setText(tv_photo, lost.getPhone());                }            };        }        if (FoundAdapter == null) {            FoundAdapter = new QuickAdapter
        
         (this, R.layout.item_list) {                @Override                protected void convert(BaseAdapterHelper helper, Found found) {                    helper.setText(tv_title, found.getTitle())                            .setText(tv_describe, found.getDescribe())                            .setText(tv_time, found.getCreatedAt())                            .setText(tv_photo, found.getPhone());                }            };        }        listview.setAdapter(LostAdapter);        // 默认加载失物界面        queryLosts();    }    private void changeTextView(View v) {        if (v == layout_found) {            tv_lost.setTag("Found");            tv_lost.setText("Found");        } else {            tv_lost.setTag("Lost");            tv_lost.setText("Lost");        }    }    @SuppressWarnings("deprecation")    private void showListPop() {        View view = LayoutInflater.from(this).inflate(R.layout.pop_lost, null);        // 注入        layout_found = (Button) view.findViewById(R.id.layout_found);        layout_lost = (Button) view.findViewById(R.id.layout_lost);        layout_found.setOnClickListener(this);        layout_lost.setOnClickListener(this);        morePop = new PopupWindow(view, mScreenWidth, 600);        morePop.setTouchInterceptor(new OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {                    morePop.dismiss();                    return true;                }                return false;            }        });        morePop.setWidth(WindowManager.LayoutParams.MATCH_PARENT);        morePop.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);        morePop.setTouchable(true);        morePop.setFocusable(true);        morePop.setOutsideTouchable(true);        morePop.setBackgroundDrawable(new BitmapDrawable());        // 动画效果 从顶部弹下        morePop.setAnimationStyle(R.style.MenuPop);        morePop.showAsDropDown(layout_action, 0, -dip2px(this, 2.0F));    }    private void initEditPop() {        mPopupWindow = new EditPopupWindow(this, 200,48);        mPopupWindow.setOnPopupItemClickListner(this);    }    EditPopupWindow mPopupWindow;    int position;    @Override    public boolean onItemLongClick(AdapterView
          arg0, View arg1, int arg2,            long arg3) {        // TODO Auto-generated method stub        position = arg2;        int[] location = new int[2];        arg1.getLocationOnScreen(location);        mPopupWindow.showAtLocation(arg1, Gravity.RIGHT | Gravity.TOP,                location[0], getStateBar() + location[1]);        return false;    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        // TODO Auto-generated method stub        super.onActivityResult(requestCode, resultCode, data);        if (resultCode != RESULT_OK) {            return;        }        switch (requestCode) {        case Constants.REQUESTCODE_ADD:// 添加成功之后的回调            String tag = tv_lost.getTag().toString();            if (tag.equals("Lost")) {                queryLosts();            } else {                queryFounds();            }            break;        }    }    /**     * 查询全部失物信息 queryLosts     *      *      */    private void queryLosts() {        showView();        BmobQuery
         
           query = new BmobQuery
          
           (); query.order("-createdAt");// 按照时间降序 query.findObjects(this, new FindListener
           
            () { @Override public void onSuccess(List
            
              losts) { // TODO Auto-generated method stub LostAdapter.clear(); FoundAdapter.clear(); if (losts == null || losts.size() == 0) { showErrorView(0); LostAdapter.notifyDataSetChanged(); return; } progress.setVisibility(View.GONE); LostAdapter.addAll(losts); listview.setAdapter(LostAdapter); } @Override public void onError(int code, String arg0) { // TODO Auto-generated method stub showErrorView(0); } }); } public void queryFounds() { showView(); BmobQuery
             
               query = new BmobQuery
              
               (); query.order("createdAt");// 按照时间降序 query.findObjects(this, new FindListener
               
                () { @Override public void onSuccess(List
                
                  arg0) { // TODO Auto-generated method stub LostAdapter.clear(); FoundAdapter.clear(); if (arg0 == null || arg0.size() == 0) { showErrorView(1); FoundAdapter.notifyDataSetChanged(); return; } FoundAdapter.addAll(arg0); listview.setAdapter(FoundAdapter); progress.setVisibility(View.GONE); } @Override public void onError(int code, String arg0) { // TODO Auto-generated method stub showErrorView(1); } }); } /** * 请求出错或者无数据时候显示的界面 showErrorView * */ private void showErrorView(int tag) { progress.setVisibility(View.GONE); listview.setVisibility(View.GONE); layout_no.setVisibility(View.VISIBLE); if (tag == 0) { tv_no.setText(getResources().getText(R.string.list_no_data_lost)); } else { tv_no.setText(getResources().getText(R.string.list_no_data_found)); } } private void showView() { listview.setVisibility(View.VISIBLE); layout_no.setVisibility(View.GONE); } @Override public void onEdit(View v) { // TODO Auto-generated method stub String tag = tv_lost.getTag().toString(); Intent intent = new Intent(this, AddActivity.class); String title = ""; String describe = ""; String phone = ""; if (tag.equals("Lost")) { title = LostAdapter.getItem(position).getTitle(); describe = LostAdapter.getItem(position).getDescribe(); phone = LostAdapter.getItem(position).getPhone(); } else { title = FoundAdapter.getItem(position).getTitle(); describe = FoundAdapter.getItem(position).getDescribe(); phone = FoundAdapter.getItem(position).getPhone(); } intent.putExtra("decribe", describe); intent.putExtra("phone", phone); intent.putExtra("title", title); intent.putExtra("from", tag); startActivityForResult(intent, Constants.REQUESTCODE_ADD); } @Override public void onDelete(View v) { // TODO Auto-generated method stub String tag = tv_lost.getTag().toString(); if (tag.equals(”Lost")) { deleteLost(); } else { deleteFound(); } } private void deleteLost() { Lost lost = new Lost(); lost.setObjectId(LostAdapter.getItem(position).getObjectId()); lost.delete(this, new DeleteListener() { @Override public void onSuccess() { // TODO Auto-generated method stub LostAdapter.remove(position); } @Override public void onFailure(int code, String arg0) { // TODO Auto-generated method stub } }); } private void deleteFound() { Found found = new Found(); found.setObjectId(FoundAdapter.getItem(position).getObjectId()); found.delete(this, new DeleteListener() { @Override public void onSuccess() { // TODO Auto-generated method stub FoundAdapter.remove(position); } @Override public void onFailure(int code, String arg0) { // TODO Auto-generated method stub } }); }}

转载于:https://www.cnblogs.com/buyaping/p/6920549.html

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