Android(安卓)MVVM结合DataBinding的简单实用（Android(安卓)studio）及自己遇到的坑
16lz
2021-12-04
使用步骤：
1、在build.gradle添加如下：
android { dataBinding { enabled = true } ...........2、我为Activity和Fragment分别写了一个Base
BaseActivity.java
//注意BaseActivity的泛型public abstract class BaseActivity extends FragmentActivity implements View.OnClickListener {protected SV bindingView;//相当于findViewById();protected T getView(int id) { return (T) findViewById(id);}@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); bindView(); initViews();}//实例化BindingViewprotected void bindView() { bindingView = DataBindingUtil.setContentView(this, getLayoutResId());}//得到布局protected abstract int getLayoutResId();//实例化public abstract void initViews();public abstract void processClick(View v);public void onClick(View v) { processClick(v);} }
BaseFragment.java
public abstract class BaseFragment extends Fragment implements View.OnClickListener {protected SV bindingView;private View view;@Overridepublic void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState);}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { view = getActivity().getLayoutInflater().inflate(setContent(), container, false); bindingView = DataBindingUtil.bind(view); initView(); setData(); return view;}protected T getView(int id) { return (T) view.findViewById(id);}/** * 布局 */public abstract int setContent();/** * 初始化布局 */public abstract void initView();public abstract void setData();public abstract void processClick(View v);@Overridepublic void onClick(View v) { processClick(v);} }
4、具体代码 ，请求接口展示数据（Activity为例）
1>.根据请求数据写实体类，我的如下：
接口有点操蛋，实体类将就着看
public class WatingModel { private String id; private String doctor_name; private String patient; private String department_name; private String department_area; private String wait; private String nowid; private String nowtime; private String go_time; public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } private String status; public String getNowtime() { return nowtime; } public void setNowtime(String nowtime) { this.nowtime = nowtime; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getDoctor_name() { return doctor_name; } public void setDoctor_name(String doctor_name) { this.doctor_name = doctor_name; } public String getPatient() { return patient; } public void setPatient(String patient) { this.patient = patient; } public String getDepartment_name() { return department_name; } public void setDepartment_name(String department_name) { this.department_name = department_name; } public String getDepartment_area() { return department_area; } public void setDepartment_area(String department_area) { this.department_area = department_area; } public String getWait() { return wait; } public void setWait(String wait) { this.wait = wait; } public String getNowid() { return nowid; } public void setNowid(String nowid) { this.nowid = nowid; } public String getGo_time() { return go_time; } public void setGo_time(String go_time) { this.go_time = go_time; }}
2、布局
几点注意的地方：
1>最外层的布局用
2>数据源
3>里面有来个属性，name是你在代码中实体类的对象 type是你的实体类，包名加类名
4>赋值：在控件的text属性中直接赋值：eg. android:text=”@{model.department_name}” 书写时会有提示
3、代码中操作：
public class WaitingDetailsActivity extends BaseActivity {//binding名字是布局名字依照驼峰命名法书写+Binding决定
private TextView title;private Dialog progressDialog;private String card_id, id;private WatingModel.Data model;//实体类@Overrideprotected int getLayoutResId() { return R.layout.activity_waiting;//布局}@Overridepublic void initViews() { //加载圈 progressDialog = LabelUtils.createLoadingDialog(WaitingDetailsActivity.this, "加载中...", true, 0); card_id = getIntent().getStringExtra("card_id"); id = getIntent().getStringExtra("id"); title = getView(R.id.title);//对于引入的布局bindingView.无法直接获取其子控件； getView(R.id.back).setOnClickListener(this); title.setText("标题"); //bingView.可直接获取控件对象，无需fandViewById(); bindingView.refresh.setOnClickListener(this); getData();}@Overridepublic void processClick(View v) { switch (v.getId()) { case R.id.back: finish(); break; }}Handler handler = new Handler(new Handler.Callback() { @Override public boolean handleMessage(Message msg) { progressDialog.dismiss(); if (msg.what == 1) { String result = msg.obj.toString(); try { JSONObject json = new JSONObject(result); String code = json.getString("code"); boolean status = json.getBoolean("status"); String info = json.getString("info"); if (status) { JSONArray array = json.getJSONArray("data"); JSONObject jsonObject = array.getJSONObject(0); Gson gson = new Gson(); model = gson.fromJson(jsonObject.toString(), WatingModel.Data.class); bindingView.setModel(model);//别忘记这句话，请求到数据后写，很重要，只有在布局中写到实体类，在代码中才有这个方法，方法名是你布局中的name； } else { LabelUtils.toast(WaitingDetailsActivity.this, code + info); } } catch (JSONException e) { e.printStackTrace(); } } else if (msg.what == 3) { LabelUtils.toast(WaitingDetailsActivity.this, getResources().getString(R.string.quest_fail)); } return false; }});public void getData() { progressDialog.show(); HashMap map = new HashMap<>(); map.put("card_id", card_id + ""); map.put("member_id", LoginDataModel.getLoginData().getMember_id() + ""); OkhttpTool.getNetData("请求地址", map).enqueue(new Callback() { @Override public void onFailure(Call call, final IOException e) { Message msg = new Message(); msg.what = 3; handler.sendMessage(msg); } @Override public void onResponse(Call call, Response response) throws IOException { String result = response.body().string(); if (response.isSuccessful()) { Message msg = new Message(); msg.what = 1; msg.obj = result; handler.sendMessage(msg); } else { Message msg = new Message(); msg.what = 3; handler.sendMessage(msg); } } });} }
简单使用介绍到这，代码量多一些，但很简单，再此说一些我在使用的过程中遇到的一些问题
1、DataBinding 使用中，包括布局 相关东西如有错误，会集体报错 ，写的时候一定要仔细
2、layout布局与他的直接子布局属性共用，有重复的话会报错，这个问题害我整了一上午的才知道，我的错误是layout加了背景 他的直接子布局也加了背景（我的项目需要），结果就冲突了，这样的布局还很多 导致整个项目瘫痪 ，报的错误仔细看最后一行，属性重复…..
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