Android使用注解避免大量的findViewById()

BindView注解类@Target(ElementType.FIELD)//表示要注解的是一个字段@Retention(RetentionPolicy.RUNTIME)//添加@interface表明这是一个注解,等价于继承了java.lang.annotation.Annotation这个类public @interface BindView {    public int id();//view的id    public boolean clickable() default false;//是否可点击,默认为false}使用

public class AnnotationActivity extends Activity implements View.OnClickListener {    @BindView(id = R.id.text_anno, clickable = true)    private TextView textView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_annotation);        initView(this, findViewById(android.R.id.content));    }    private void initView(Object viewClass, View view) {        Field[] fields = viewClass.getClass().getDeclaredFields();        if (fields != null && fields.length > 0) {            for (Field field : fields) {                BindView bindView = field.getAnnotation(BindView.class);                if (bindView != null) {                    int id = bindView.id();                    boolean clickable = bindView.clickable();                    try {                        field.setAccessible(true);                        if (clickable) {                            view.findViewById(id).setOnClickListener((View.OnClickListener) viewClass);                        }                        //将viewClass中的field赋值为view.findViewById(id)                        field.set(viewClass, view.findViewById(id));                    } catch (IllegalAccessException e) {                        e.printStackTrace();                    }                }            }        }    }    @Override    public void onClick(View v) {        Toast.makeText(this, "click!", Toast.LENGTH_SHORT).show();        textView.setText("click");    }

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