第一行Kotlin系列（二）Intent隐式显式跳转及向下传值

1.Intent显式跳转页面

val button5 = findViewById<Button>(R.id.mButton5)
 
button5.setOnClickListener {
            val intent = Intent()
            intent.setClass(this, ThirdActivity::class.java)
            startActivity(intent)
        }

跳转方式一

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1	intent.setClass(this, ThirdActivity::class.java)

  // 获取class是使用::反射

跳转方式二

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1	intent.setClass(this, ThirdActivity().javaClass)

2.Intent隐式跳转调用系统拨号

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val button6 = findViewById<Button>(R.id.mButton6)    button6.setOnClickListener {             val intent = Intent(Intent.ACTION_DIAL)             val url = Uri.parse("tel:10086")             intent.data = url             startActivity(intent)         }

3.Intent跳转页面并向下一页传值 

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val button7 = findViewById<Button>(R.id.mButton7)    override fun onClick(v: View?) {         when (v?.id) {             R.id.mButton1 ->                 Toast.makeText(this, "java", Toast.LENGTH_LONG).show()             R.id.mButton2 ->                 Toast.makeText(this, "java", Toast.LENGTH_LONG).show()             R.id.mButton7 -> {                 val intent = Intent(this@MainActivity, GetIntentData::class.java)                 val bundle = Bundle()                 bundle.putString("text", "Kotlin练习")                 intent.putExtras(bundle)                 startActivity(intent)             }         }     }

注意 使用when 当有多行代码时使用“{ }”括起来

接收Activity页面代码

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private fun initView() {         val bundle = this.intent.extras         val str = bundle?.get("text").toString()         val mTvText = findViewById<TextView>(R.id.mTvText)         mTvText.text = str     }

mTvText.text = str 相当于java中 mTvText.setText(str)

以上