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

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<Lost> LostAdapter;// 失物

    protected QuickAdapter<Found> 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<Lost>(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<Found>(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<Lost> query = new BmobQuery<Lost>();
        query.order("-createdAt");// 按照时间降序
        query.findObjects(this, new FindListener<Lost>() {

            @Override
            public void onSuccess(List<Lost> 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<Found> query = new BmobQuery<Found>();
        query.order("createdAt");// 按照时间降序
        query.findObjects(this, new FindListener<Found>() {

            @Override
            public void onSuccess(List<Found> 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

            }
        });
    }

}

结对成员已将登录与注册界面设计发布 可参考http://www.cnblogs.com/buyaping/p/6942822.html