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收发广播
使用场景：Fragment想要向外传递信息
- 在Fragment中发送广播
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50class BlankFragment : Fragment() {
var ctx:Context? = null
var mPosition:Int = 0
var mInageId:Int = 0
var mDesc:String = ""
var title:String = ""
val colorNames = listOf<String>("红色","黄色","绿色","青色","蓝色")
val colors = intArrayOf(Color.RED, Color.YELLOW, Color.GREEN, Color.CYAN, Color.BLUE)
var mSeq:Int = 0
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
ctx = activity
if (arguments != null) {
mPosition = arguments!!.getInt("position", 0)
mInageId = arguments!!.getInt("image_id", 0)
mDesc = arguments!!.getString("desc")
title = arguments!!.getString("title")
}
val view = inflater.inflate(R.layout.show_info, container, false)
view.findViewById<ImageView>(R.id.imageView).setImageResource(mInageId)
view.findViewById<TextView>(R.id.textView).text = mDesc
view.findViewById<Button>(R.id.se).setOnClickListener {
ctx!!.selector("选择颜色", colorNames) {
mSeq = it
val intent = Intent(BlankFragment.EVENT)
intent.putExtra("seq", it)
intent.putExtra("color", colors[it])
ctx!!.sendBroadcast(intent)//发送广播
}
}
return view
}
companion object {
const val EVENT:String = "changeColor"//const，编译期常量
fun newInstance(position:Int, image_id:Int, desc:String, title:String) : BlankFragment {
val fragment = BlankFragment()
val bundle = Bundle()
bundle.putInt("position", position)
bundle.putInt("image_id", image_id)
bundle.putString("desc", desc)
bundle.putString("title", title)
fragment.arguments = bundle
return fragment
}
}
} - 在要接收广播的页面注册receiver
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41class MainActivity : FragmentActivity(){
private var BGChangeRecever:myBgChangeRecever? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var vp:ViewPager = findViewById(R.id.vp)
var title: PagerTabStrip = findViewById(R.id.title)
val pics = arrayOf(R.mipmap.basic, R.mipmap.close, R.mipmap.debug, R.mipmap.edit)
val list:MutableList<itemInfo> = mutableListOf()
for (i in pics.indices) {
list.add(itemInfo((i+1).toString(), pics[i], ((i+1)*(i+1)).toString()))
}
vp.adapter = infoPagerAdapter(supportFragmentManager, list)
vp.currentItem = 0
}
public override fun onStart() {
super.onStart()
BGChangeRecever = myBgChangeRecever()
val filiter = IntentFilter(BlankFragment.EVENT)//广播过滤器，过滤掉参数以外的广播
registerReceiver(BGChangeRecever,filiter)//开始时注册接收器
}
public override fun onStop() {
unregisterReceiver(BGChangeRecever)//结束前注销接收器
super.onStop()
}
private inner class myBgChangeRecever : BroadcastReceiver() {//广播接收器
override fun onReceive(context: Context?, intent: Intent?) {//接收广播后执行的操作
if (intent != null) {
val color = intent.getIntExtra("color", Color.GREEN)
textView2.setTextColor(color)
}
}
}
}