Android 利用反射和注解获取Activity之间的传值

概述1、首先创建注解类：@Target(ElementType.FIELD)@Retention(RetentionPolicy.RUNTIME)public@interfaceAutowire{Stringvalue()default"";}2、编写通过反射拿去属性值，以及设置值到指定属性上：publicclassInitExtureValueUtil{publicstaticvoidgetExt

1、首先创建注解类：

@Target(ElementType.FIELD)@Retention(RetentionPolicy.RUNTIME)public @interface autowire {    String value() default "";}

2、编写通过反射拿去属性值，以及设置值到指定属性上：

public class InitExtureValueUtil {    public static voID getExtureValue(Activity activity) {        if (activity == null) {            return;        }        // 获取类信息        Class<? extends Context> aClass = activity.getClass();        // 获取属性        FIEld[] declaredFIElds = aClass.getDeclaredFIElds();        if (declaredFIElds == null || declaredFIElds.length == 0) {            return;        }        // 获取intent        Method getIntent;        // 可以直接用后面这个获取，也可以用下面的反射获取 intent = activity.getIntent()        Intent intent;        try {            getIntent = aClass.getmethod("getIntent");            intent = (Intent) getIntent.invoke(activity);        } catch (NoSuchMethodException | illegalaccessexception | InvocationTargetException e) {            e.printstacktrace();            return;        }        if (getIntent == null || intent == null) {            return;        }        for (FIEld fIEld : declaredFIElds) {            // 获取注解            autowire annotation = fIEld.getAnnotation(autowire.class);            if (annotation != null) {                String key = annotation.value();                if (TextUtils.isEmpty(key)) {                    // 如果注解没有设置key，则设置字段的名称为key                    key = fIEld.getname();                }                // 获取到传递过来的值  这种获取到的数据不用判断类型，后面直接赋值给属性即可                Object value = intent.getExtras().get(key);                if (value == null) {                    continue;                }                // 设置属性可改变（私有属性才需要进行设置，共有属性设置了也没关系）                fIEld.setAccessible(true);                // 设置值到当前页面的属性上面                try {                    fIEld.set(activity, value);                } catch (illegalaccessexception e) {                    e.printstacktrace();                }            }        }    }}

3、创建数据类型1：

public class GoodBean implements Serializable {    private static long serialVersionUID = 1L;    private String name;    private int size;    private String productDate;    public  GoodBean(String name,int size,String productDate){        this.name = name;        this.size = size;        this.productDate = productDate;    }    public String getname() {        return name;    }    public voID setname(String name) {        this.name = name;    }    public int getSize() {        return size;    }    public voID setSize(int size) {        this.size = size;    }    public String getProductDate() {        return productDate;    }    public voID setProductDate(String productDate) {        this.productDate = productDate;    }    @OverrIDe    public String toString() {        return "GoodBean{" +                "name='" + name + '\'' +                ", size=" + size +                ", productDate='" + productDate + '\'' +                '}';    }}

4、创建数据类型2：

public class GoodBeanParc implements Parcelable {    private String name;    private int age;    public GoodBeanParc(String name,int age){        this.name = name;        this.age = age;    }    protected GoodBeanParc(Parcel in) {        name = in.readString();        age = in.readInt();    }    public static final Creator<GoodBeanParc> CREATOR = new Creator<GoodBeanParc>() {        @OverrIDe        public GoodBeanParc createFromParcel(Parcel in) {            return new GoodBeanParc(in);        }        @OverrIDe        public GoodBeanParc[] newArray(int size) {            return new GoodBeanParc[size];        }    };    @OverrIDe    public String toString() {        return "GoodBeanParc{" +                "name='" + name + '\'' +                ", age=" + age +                '}';    }    @OverrIDe    public int describeContents() {        return 0;    }    @OverrIDe    public voID writetoParcel(Parcel dest, int flags) {        dest.writeString(name);        dest.writeInt(age);    }}

5、起始页面：

public class MainActivity2 extends AppCompatActivity {    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main2);        findVIEwByID(R.ID.gotoNextPage).setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw v) {                Intent inttool = new Intent(MainActivity2.this,MainActivityTwo.class);                inttool.putExtra("name", "王大锤");                inttool.putExtra("age", 18);                inttool.putExtra("good", new GoodBean("苹果", 1000, "2021年4月20日14:12:26"));                inttool.putExtra("goodParc",new GoodBeanParc("21",1));                startActivity(inttool);            }        });    }}

6、结束页面：

public class MainActivityTwo extends AppCompatActivity {    private static final String TAG = "InitExtureValueUtil";    @autowire    private String name;    @autowire    private int age;    @autowire    private GoodBean good;    @autowire    private GoodBeanParc goodParc;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main_two);        InitExtureValueUtil.getExtureValue(this);        Log.e(TAG,"name==" + name);        Log.e(TAG,"age==" + age);        Log.e(TAG,"good==" + good);        Log.e(TAG,"goodParc==" + goodParc);    }}

7、结束页面打印的值

2021-04-22 15:41:21.674 13387-13387/com.xhs.testapplication E/InitExtureValueUtil: name==王大锤2021-04-22 15:41:21.675 13387-13387/com.xhs.testapplication E/InitExtureValueUtil: age==182021-04-22 15:41:21.675 13387-13387/com.xhs.testapplication E/InitExtureValueUtil: good==GoodBean{name='苹果', size=1000, productDate='2021年4月20日14:12:26'}2021-04-22 15:41:21.675 13387-13387/com.xhs.testapplication E/InitExtureValueUtil: goodParc==GoodBeanParc{name='21', age=1}

 

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