Android学习笔记10

今天来用kotlin实作一个BaseActivity，方便以後跳页传值使用

   fun start(next: Class<*>, bundle: Bundle?, finished: Boolean) {
    val  intent = Intent(this , next::class.java)
    if(bundle == null)intent.putExtras(Bundle())
    else intent.putExtras(bundle)
    startActivity(intent)
    if (finished) this.finish()
}

也可以用类似java的写法

lateinit var intent : Intent
   intent.setClass(this, next::class.java)

然後要记得用Bundle的空值设定，否则传进去是空值的话会报错
然後因为平常不会每一次都要传值或是终止activity，所以可以在下面这麽做

  fun start(next: Class<*>){
     this.start(next,null,false)
 }

  fun start(next: Class<*>,bundle: Bundle?){
    this.start(next,bundle,false)
}

  fun start(next: Class<*>, finished: Boolean){
    this.start(next,null,finished)
}

完整程序码

class BaseActiivity : AppCompatActivity() {

       fun start(next: Class<*>, bundle: Bundle?, finished: Boolean) {
        lateinit var intent : Intent
           intent.setClass(this, next::class.java)
        if(bundle == null)intent.putExtras(Bundle())
        else intent.putExtras(bundle)
        startActivity(intent)
        if (finished) this.finish()
    }

      fun start(next: Class<*>){
         this.start(next,null,false)
     }

      fun start(next: Class<*>,bundle: Bundle?){
        this.start(next,bundle,false)
    }

      fun start(next: Class<*>, finished: Boolean){
        this.start(next,null,finished)
    }

}