dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
  exclude group: 'com.android.support', module: 'support-annotations'
 })
 compile 'com.android.support:appcompat-v7:25.1.1'
 testCompile 'junit:junit:4.12'
}

compile 'com.android.support:support-annotations:xx.x.x'

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  String s = null;
  test(s);
 }

 public void test(@NonNull String s){
  System.out.println(s);
 }

}

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  testString(112312);
  testString(R.string.app_name);
 }

 public void testString(@StringRes int s){
  System.out.println(s);
 }

}

@Target(ElementType.FIELD) //解析常量
@Retention(RetentionPolicy.RUNTIME) //运行时
public @interface BindView {
  int value() default -1; //标识控件
}

/**
 * Created by Litp on 2017/2/17.
 */
public class BindViewParser {

 /**
  * 传递activty或者View 对象，使用反射获取view变量
  * @param object
  */
 public static void inject(Object object) {

  try {
   parse(object);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 /**
  * 解析获取值
  * @param object
  * @throws Exception
  */
 public static void parse(Object object) throws Exception {

  final Class<?> clazz = object.getClass();

  View view = null;

  //获取clazz的变量，不论private还是public
  Field[] fields = clazz.getDeclaredFields();

  for (Field field : fields) {

   //这个变量 是否有BindView注解
   if (field.isAnnotationPresent(BindView.class)) {
    //获取这个变量对应的注解
    BindView injectView = field.getAnnotation(BindView.class);
    //获取值
    int id = injectView.value();
    if (id <= 0) {
     throw new Exception("View的id不能为空");
    } else {
     //设置可以访问
     field.setAccessible(true);
     //获取view
     if (object instanceof View) {
      view = ((View) object).findViewById(id);
     } else if (object instanceof Activity) {
      view = ((Activity) object).findViewById(id);
     }
     //设置View
     field.set(object, view);
    }

   }

  }

 }


}

public class MainActivity extends AppCompatActivity {

 //使用注解标识变量
 @BindView(R.id.tv_test)
 TextView textView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  //传递当前activty给解析器，进行初始化view
  BindViewParser.inject(this);

  //这里就已经是初始化完毕了，可以进行使用了
  textView.setText("测试自己的注入demo");

 }


}