import java.lang.annotation.ElementType
import java.lang.annotation.RetentionPolicy
/**
* 定义一个注解
* @property value String 无值的时候，取属性名字，有值使用value的值
* @constructor
*/
@Target(AnnotationTarget.FUNCTION, AnnotationTarget.FIELD)
@Retention(AnnotationRetention.RUNTIME)
public annotation class AutoIntentData(val value: String = "")
import android.app.Activity
import android.os.Bundle
import android.os.Parcelable
import android.text.TextUtils
import com.google.android.material.internal.ParcelableSparseArray
import java.lang.Exception
import java.lang.RuntimeException
object AutoIntentDataUtils {
/**
* 方式从Intent中取值
* @param activity Activity
*/
fun inject(activity: Activity) {
try {
val intent = activity.intent
//获取属性
val field = activity::class.java.declaredFields
//遍历所有属性
field.forEach {
it.isAccessible = true
//获取注解
val annotation = it.getAnnotation(AutoIntentData::class.java)
if (null != annotation) {
var key = if (TextUtils.isEmpty(annotation.value)) it.name else annotation.value
//2、从Intent中获取
//判断数据类型
if (it.genericType.toString().equals("class java.lang.String")) {
if ("" != annotation.value) {
//根据类型冲intent中取值
//注解的时候设置了valute使用value的值获取
val valueString = intent.getStringExtra(annotation.value)
if (null != valueString) {
it.set(activity, valueString)
} else {
it.set(activity, "")
}
} else {
//注解的时候没有设置了valute使用属性名字获取
val valueString = intent.getStringExtra(it.name)
if (null != valueString) {
it.set(activity, valueString)
} else {
it.set(activity, "")
}
}
} else if (it.genericType.toString().equals("int") || it.genericType.toString()
.equals("class java.lang.Integer")
) {
val valueString = intent.getIntExtra(key, 0)
it.set(activity, valueString)
} else if (it.genericType.toString()
.equals("double") || it.genericType.toString()
.equals("class java.lang.Double")
) {
val valueString = intent.getDoubleExtra(key, 0.00)
it.set(activity, valueString)
} else if (it.genericType.toString()
.equals("boolean") || it.genericType.toString()
.equals("class java.lang.Boolean")
) {
val valueString = intent.getBooleanExtra(key, false)
it.set(activity, valueString)
} else if (it.genericType.toString()
.equals("float") || it.genericType.toString()
.equals("class java.lang.Float")
) {
val valueString = intent.getFloatExtra(key, 0F)
it.set(activity, valueString)
} else {
throw RuntimeException("只支持基本数据类型intent传值")
}
}
}
} catch (e: Exception) {
throw RuntimeException(e.message)
}
}
/**
* 从bundle中取值
* @param activity Activity
*/
fun injectBundle(activity: Activity) {
try {
val intent = activity.intent
//1、从bunlde中获取 也可以从Intent中取值
val extras: Bundle = intent.extras ?: return;
//获取属性
val field = activity::class.java.declaredFields
//遍历所有属性
field.forEach {
it.isAccessible = true
//获取注解
val annotation = it.getAnnotation(AutoIntentData::class.java)
if (null != annotation) {
val key = if (TextUtils.isEmpty(annotation.value)) it.name else annotation.value
if (extras.containsKey(key)) {
val obj = extras.get(key)
//需要单独处理Parcelable
if (obj is Parcelable) {
}
it.set(activity, obj)
}
}
}
} catch (e: Exception) {
throw RuntimeException(e.message)
}
}
}
使用
class MainActivity : AppCompatActivity() {
var banding: ActivityMainBinding? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
banding = DataBindingUtil.setContentView(this, R.layout.activity_main)
banding!!.btn.setOnClickListener {
goActivity()
}
}
private fun goActivity() {
var intent = Intent()
intent.setClass(this, MainActivity2::class.java)
intent.putExtra("data", "测试数据")
intent.putExtra("data2", "你好世界")
intent.putExtra("data3", 12)
intent.putExtra("data4", 1.22)
intent.putExtra("data5", true)
var bundle = Bundle()
bundle.putString("data6", "来之bundle")
intent.putExtras(bundle)
startActivity(intent)
}
}
class MainActivity2 : AppCompatActivity() {
@AutoIntentData(value = "data")
public var data: String = ""
@AutoIntentData
public var data2: String = ""
@AutoIntentData
public var data3: Int = 0
@AutoIntentData
public var data4: Double = 0.00
@AutoIntentData
public var data5: Boolean = false
@AutoIntentData
public var data6: String = ""
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main2)
//初始化注解
AutoIntentDataUtils.injectBundle(this)
// Toast.makeText(
// this,
// "数据一：${data}；数据二：${data2}；数据三：${data3}；数据四：${data4}；数据五：${data5}",
// Toast.LENGTH_LONG
// ).show()
Toast.makeText(
this,
"数据6：${data6}",
Toast.LENGTH_LONG
).show()
}
}
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