Lost and Found(失物招領APP）

Lost and Found（失物招領APP）是以Bmob為基礎的，參考了網上的案例。主要實現物品的發布、修改、呈現和刪除。使用場景如下：用戶撿到物品，打開手機軟件，填寫物品的招領信息（標題、描述和聯系方式）；用戶丟失物品，打開手機軟件，填寫物品的丟失信息（標題、描述和聯系方式）；任何人都可以查看到失物和招領的信息列表，可以對發布的信息進行刪除。該項目將使用到Bmob的以下幾個功能：

1、 添加數據

添加失物/招領信息到服務器中。

2、 查找數據

在列表中顯示所有用戶發布的失物/招領信息。

3、 刪除數據

刪除已發布的失物/招領信息。

部分界面效果如下：

進入動畫 主界面

失物信息界面添加失物信息界面

失物列表 編輯刪除

數據結構設計

初始化SDK

Bmob為每個應用都提供了一個唯一標識，使用Bmob開發的應用都要首先使用這個Application ID”進行初始化（在前面博客中已經提到）。對應代碼如下：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //初始化 Bmob SDK，第一個參數為上下文，第二個參數為Application ID
    Bmob.initialize(this, Constants.Bmob_APPID);
    //其他代碼
}

Lost類和Found類

為操作Bmob的雲端數據庫，SDK首先需要創建數據表對應的模型類（模型類的名稱必須和雲端數據表的名稱一致），該類需要繼承自BmobObject，實現剛剛創建的數據表字段的set和get方法（系統默認字段objectId、createAt、updateAt不需要聲明）。因為項目需要操作Lost表和Found表，因此需要創建Lost類和Found類。

創建失物對象

public class Lost extends BmobObject{

    private String title;//標題
    private String describe;//描述
    private String phone;//聯系手機
    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;
    }
    
}

創建招領對象

public class Found extends BmobObject {

    private String title;//標題
    private String describe;//描述
    private String phone;//聯系手機
    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/招領信息

用戶填寫了失物信息之後，只需要構造一個Lost實例，然後簡單調用模型類的insertObject方法就可以將信息添加到雲數據庫中，實現代碼如下:

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("添加招領信息");
        }
    }

    @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="";
    
    /**根據類型添加失物/招領
      *
      */
    private void addByType(){
        title = edit_title.getText().toString();
        describe = edit_describe.getText().toString();
        photo = edit_photo.getText().toString();
        
        if(TextUtils.isEmpty(title)){
            ShowToast("請填寫標題");
            return;
        }
        if(TextUtils.isEmpty(describe)){
            ShowToast("請填寫描述");
            return;
        }
        if(TextUtils.isEmpty(photo)){
            ShowToast("請填寫手機");
            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("添加失敗:"+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("招領信息添加成功!");
                setResult(RESULT_OK);
                finish();
            }
            
            @Override
            public void onFailure(int code, String arg0) {
                // TODO Auto-generated method stub
                ShowToast("添加失敗:"+arg0);
            }
        });
    }
}

獲取失物/招領列表、刪除失物招領信息

項目使用到Bmob提供的最簡單的查詢和排序功能，直接調用BmobQuery類的findObjects方法和order方法來獲取失物列表。從雲數據庫中刪除某條記錄需要設置這個要刪除的ObjectId的信息，再調用模型類的deleteObject方法就可以了，實現代碼如下

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;// 招領

    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);
        // 默認是失物界面
        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);
        // 初始化長按彈窗
        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);
        // 默認加載失物界面
        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);
        // 註入
        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());
        // 動畫效果 從頂部彈下
        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:// 添加成功之後的回調
            String tag = tv_lost.getTag().toString();
            if (tag.equals("Lost")) {
                queryLosts();
            } else {
                queryFounds();
            }
            break;
        }
    }

    /**
     * 查詢全部失物信息 queryLosts
     * 
     * 
     */
    private void queryLosts() {
        showView();
        BmobQuery<Lost> query = new BmobQuery<Lost>();
        query.order("-createdAt");// 按照時間降序
        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");// 按照時間降序
        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);
            }
        });
    }

    /**
     * 請求出錯或者無數據時候顯示的界面 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

            }
        });
    }

}

結對成員已將登錄與註冊界面設計發布 可參考http://www.cnblogs.com/buyaping/p/6942822.html

物品丟失與找回（結對項目）