Android adpter中使用databinding android databinding缺点

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<SV extends ViewDataBinding> extends FragmentActivity implements View.OnClickListener {

protected SV bindingView;
//相当于findViewById();
protected <T extends View> T getView(int id) {
    return (T) findViewById(id);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    bindView();   
    initViews();
}
//实例化BindingView
protected 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<SV extends ViewDataBinding> extends Fragment implements View.OnClickListener {
protected SV bindingView;
private View view;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public 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 extends View> 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);

@Override
public 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

<layout
 xmlns:android="http://schemas.android.com/apk/res/android" >

    <data>
    <variable
        name="model"
        type="com.xinghongkeji.ydzh.wisdommedical.model.WatingModel"></variable> </data>

     <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_paren“
        android:orientation="vertical">

      <include layout="@layout/alltitle_simple"></include>

     <ScrollView
        android:id="@+id/sc"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/list_bg"
        android:scrollbars="none">

        <LinearLayout
            android:id="@+id/ll"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:visibility="gone">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="@dimen/margin_20"
                android:orientation="vertical">                
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/white"
                    android:orientation="horizontal">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_margin="@dimen/margin_16"
                        android:text="科室：        "
                        android:textColor="@color/black"
                        android:textSize="@dimen/textSize_18" />

                    <TextView
                        android:id="@+id/department"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_vertical"
                        android:text="@{model.department_name}"
                        android:textColor="@color/content_color"
                        android:textSize="@dimen/textSize_18" />
                </LinearLayout>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/item_gray"
                    android:orientation="horizontal">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_margin="@dimen/margin_16"
                        android:text="就诊人：    "
                        android:textColor="@color/black"
                        android:textSize="@dimen/textSize_18" />

                    <TextView
                        android:id="@+id/name"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@{model.patient}"
                        android:layout_gravity="center_vertical"
                        android:textColor="@color/content_color"
                        android:textSize="@dimen/textSize_18" />
                </LinearLayout>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/white"
                    android:orientation="horizontal">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_margin="@dimen/margin_16"
                        android:text="就诊医生："
                        android:textColor="@color/black"
                        android:textSize="@dimen/textSize_18" />

                    <TextView
                        android:id="@+id/doctor"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_vertical"
                        android:text="@{model.doctor_name}"
                        android:textColor="@color/content_color"
                        android:textSize="@dimen/textSize_18" />
                </LinearLayout>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/item_gray"
                    android:orientation="horizontal">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_margin="@dimen/margin_16"
                        android:text="就诊时间："
                        android:textColor="@color/black"
                        android:textSize="@dimen/textSize_18" />

                    <TextView
                        android:id="@+id/date"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_vertical"
                        android:text="@{model.go_time}"
                        android:textColor="@color/content_color"
                        android:textSize="@dimen/textSize_18" />
                </LinearLayout>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/white"
                    android:orientation="horizontal">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_margin="@dimen/margin_16"
                        android:text="就诊地点："
                        android:textColor="@color/black"
                        android:textSize="@dimen/textSize_18" />

                    <TextView
                        android:id="@+id/area"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_vertical"
                        android:text="@{model.department_area}"
                        android:textColor="@color/content_color"
                        android:textSize="@dimen/textSize_18" />
                </LinearLayout>           
            </LinearLayout>
        </LinearLayout>
    </ScrollView>
</LinearLayout>

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

@Override
protected int getLayoutResId() {
    return R.layout.activity_waiting;//布局
}

@Override
public 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();
}

@Override
public 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<String, String> 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…..