Android注解式绑定控件BindView

Android注解式绑定控件BindView

BindView.java

import java.lang.annotation.ElementType;  
import java.lang.annotation.Retention;  
import java.lang.annotation.RetentionPolicy;  
import java.lang.annotation.Target;  
  
@Target(ElementType.FIELD)  
@Retention(RetentionPolicy.RUNTIME)  
public @interface BindView {  
    int id();  
    boolean click() default false;  
}

AnnotateUtil.java

import android.annotation.TargetApi;  
import android.app.Activity;  
import android.app.Fragment;  
import android.content.Context;  
import android.util.Log;  
import android.view.View;  
  
import java.lang.reflect.Field;  
  
public class AnnotateUtil {  
    public AnnotateUtil() {  
    }  
  
    public static void initBindView(Object currentClass, View sourceView) {  
        Field[] fields = currentClass.getClass().getDeclaredFields();  
        if(fields != null && fields.length > 0) {  
            Field[] var6 = fields;  
            int var5 = fields.length;  
  
            for(int var4 = 0; var4 < var5; ++var4) {  
                Field field = var6[var4];  
                BindView bindView = (BindView)field.getAnnotation(BindView.class);  
                if(bindView != null) {  
                    int viewId = bindView.id();  
                    boolean clickLis = bindView.click();  
  
                    try {  
                        field.setAccessible(true);  
                        if(clickLis) {  
                            sourceView.findViewById(viewId).setOnClickListener((View.OnClickListener)currentClass);  
                        }  
  
                        field.set(currentClass, sourceView.findViewById(viewId));  
                    } catch (Exception var11) {  
                        var11.printStackTrace();  
                    }  
                }  
            }  
        }  
  
    }  
  
    public static void initBindView(Activity aty) {  
        initBindView(aty, aty.getWindow().getDecorView());  
    }  
  
    public static void initBindView(View view) {  
        Context cxt = view.getContext();  
        if(cxt instanceof Activity) {  
            initBindView((Activity)cxt);  
        } else {  
            Log.d("AnnotateUtil.java", "the view don\'t have root view");  
        }  
    }  
  
    @TargetApi(11)  
    public static void initBindView(Fragment frag) {  
        initBindView(frag, frag.getActivity().getWindow().getDecorView());  
    }  
}

使用方式 Activity、Fragment中：

@BindView(id = R.id.headerlayout)  
private HeaderLayout headerLayout;  
  
@Override  
protected void onCreate(Bundle savedInstanceState){  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.acitvity_weather);  
  
    AnnotateUtil.initBindView(this);  
}

Adapter的ViewHolder中：

import android.content.Context;  
import android.graphics.Color;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.TextView;  
  
import com.practice.noyet.coolweather.model.County;  
import com.practice.noyet.coolweather.util.AnnotateUtil;  
import com.practice.noyet.coolweather.util.BindView;  
  
public class SpinnerArrayAdapter extends SpinnerAdapter {  
  
    public SpinnerArrayAdapter(Context context) {  
        super(context);  
    }  
  
    @Override  
    public View getView(int position, View view, ViewGroup viewGroup) {  
        Holder holder;  
        if (view == null) {  
            view = mInflater.inflate(android.R.layout.simple_list_item_1, null);  
            holder = new Holder(view);  
            view.setTag(holder);  
        } else {  
            holder = (Holder) view.getTag();  
        }  
  
        County county = (County) getItem(position);  
        holder.textView.setText(county.getCountyName());  
        return view;  
    }  
  
    private class Holder {  
  
        @BindView(id = android.R.id.text1)  
        public TextView textView;  
  
        public Holder(View view) {  
            AnnotateUtil.initBindView(this, view);  
        }  
    }  
}