https://github.com/queeniecplusplus/android_review_8
Intent to Activity or Context
https://github.com/queeniecplusplus/android_review_8
android intent kotlin
Last synced: about 2 months ago
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Intent to Activity or Context
- Host: GitHub
- URL: https://github.com/queeniecplusplus/android_review_8
- Owner: QueenieCplusplus
- Created: 2021-01-23T00:49:01.000Z (about 4 years ago)
- Default Branch: main
- Last Pushed: 2021-01-23T03:09:31.000Z (about 4 years ago)
- Last Synced: 2025-01-06T04:26:21.791Z (4 months ago)
- Topics: android, intent, kotlin
- Homepage: https://github.com/QueenieCplusplus/QuickGoThru#google-android-kotlin-溫故安卓-計畫復甦
- Size: 106 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Android_Review_8
Intent to Activity or Context 意圖分享純文本，
使用 IntentBuilder 取代 Intent
1. design layout with UI element. And add on Guideline to make a space between ImageView & ImageButton.
//activity_main.xml
2. define dimens.
// go to app/src/main/res/values/dimens.xml
16dp
3. define customed color.
// go to app/src/main/res/values/colors.xml
#ffffff
#6ab343
#99000000
4. define resorces in app/src/main/res/drawable.
5. design menu resource.
// go to app/src/main/res/menu
// main_menu.xml
6. to create a R.string which is located in file called string.xml under dir res/values/.
Kates App
$
0
Garmin Watch
I\'ve clicked %1$d Desserts for a total of %2$d$ #AndroidDessertClicker
Share
Sharing Not Available
7. source line of code.
package com.example.android.katesapp
[default module]
import android.os.bundle
import androidx.appcompat.app.AppCompatActivity
[databind module]
import androidx.databinding.DataBindingUtil
import com.example.android.katesapp.databinding.ActivityMainBinding
[intent module]
import androidx.core.app.ShareCompat
[system error handler module]
import android.content.ActivityNotFoundException
[menu module]
import android.view.Menu
import android.view.MenuItem
[Toast module]
import android.widget.Toast
class MainActivity: AppCompatActivity(){
// 類別中的共用變數
private var price = 0
private var volume = 0
private lateinit var binding: ActivityMainBinding
// 製作資料型別
// data class garminWatchToBuy(val)
// create a Data Type
// Data Class
// it includes the resource id.
data class garmin3C(val imgId: Int, val price: Int, val volumn: Int)
// 建立集合裝載資料型別的成員
// create a List
// 拆解集合為成員
private val allGarmin3C = listOf(
garmin3C(R.drawable.watchA, 6990, 5),
garmin3C(R.drawable.watchB, 7990, 15),
garmin3C(R.drawable.watchC, 19900, 20)
)
// 提取集合中的成員，成員有 id、價格、數量等屬性
private var currentWatch = allGarmin[0]
override fun onCreate(savedInstanceState: Bundle?){
super.onCreate(savedInstanceState)
// 綁定 UI 元件
binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
// 顯示 UI 元件
binding.imgB.setOnClickListner {
clickBuyHandler()
}
binding.imgB.setImageResource(currentWatch.imgId)
binding.price = price
binding.volumn = volumn
}
private fun clickBuyHandler() {
// update value of volumn when user click on the button to demonstrate he/she wanna buy it
volumnAfterBuy--
binding.volumn = volumnAfterBuy
showOtherWatch()
}
private fun showOtherWatch() {
// TODO
// for-in loop
// use the data class called allGramin3C
// retrieve the gramin3C data by creating a varibale calling allGramin3C[0]
// see Anroid_Review_7
}
// Menu to be inflated
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.main_menu, menu)
return super.onCreateOptionsMenu(menu)
}
// Items to be selected
override fun onOptionsItemSelected(item: MenuItem): Boolean {
// lambda
// (itemId) -> {body}
// {itemId -> body}
when(item.itemId){
R,id.showMenuTouch -> showGarmin()
}
return super.onOptionsItemSelected(item)
}
// ShareCompat is a public class
// its IntentBuilder is a constructor
// then call its methods and properties
// Intent
// Exception Handler
private fun showGarmin() {
// Intent
// setText(CharSequence text)
// Set the literal text data to be sent as part of the share.
// Question on getIntent() instead of .intent
val showIntent = ShareCompat.IntentBuilder.from(this).setText(getString(R.string.share_text, price, volumn)).setType("text/plain").intent
try {
startActivity(showIntent)
} catch(ex: ActivityNotFoundException) {
Toast.makeText(this, getString(), Toast.LENGTH_LONG).show()
}
}
}
8. today's tip (getString())
https://cloud.tencent.com/developer/ask/72642
9. today's tip (field)
%1$d , the first filed that holds integer type variable
%2$s , the second field that holds string type varibale
https://stackoverflow.com/questions/3656371/is-it-possible-dynamically-to-add-string-to-string-xml-in-android
https://blog.csdn.net/wufen1103/article/details/7846691
10. today's tip (constructor)
1. constructor can't be called directly.
2. constructor has no param.
3. before instance is created, we use constructor instad to ref the members.
https://stackoverflow.com/questions/4506990/what-is-the-use-of-static-constructors
11. today's tip (CharSequence & String)
https://stackoverflow.com/questions/3600635/what-is-the-difference-between-charsequence-and-a-string
12. android's tip (IntentBuiler 意圖建構器)
1. 先導入模組 androidx.core.app.ShareCompat.IntentBuilder。
2. 我們使用此模組，目的是建造一個 IntentBuilder 的型別的實例。
3. 因建構子無法單獨使用，故先呼叫公共類別 SharCompat 與建構子 .IntenBuilder。
4. 建構子成立後，可呼叫內部成員方法，如
setText(@Nullable text: CharSequence?): IntentBuilder
setType(@Nullable mimeType: String?): IntentBuilder
setStream(@Nullable streamUri: Uri?): IntentBuilder
// HTML markup
setHtmlText(@Nullable htmlText: String?): IntentBuilder
------------------------------------------------------------------
from(@NonNull activity: Activity): IntentBuilder
startChooser(): void
getInetent(): Intent
setSubject(@Nullable subject: String?): IntentBuilder
setEmailBcc(@Nullable addresses: Array?): IntentBuilder
setEmailTo(@Nullable addressess: Array?): IntentBuilder
------------------------------------------------------------------
https://developer.android.com/reference/kotlin/androidx/core/app/ShareCompat.IntentBuilder
13. android's tip (Intent 意圖)
------------Main2Activity.java--------------------
//使用 putExtra(), getExtra() 夾帶資料
EditText et;
et = fincdViewById(R.id.edit_text);
// et.getText().toString() or getString(et)
String Msg = et.getString();
Intent anotherIntent = new Intent(MainActivity.this, Main2Activity.class);
anotherIntent.putExtra("I luv android since 2018", msg)
// setResult(2, anotherIntent);
startActivity(anotherIntent);
------------MainActivity.java-----------------------
// onCreate()
Intent intent = new Intent(MainActivity.this, Main2Activity.class);
startActivityForResult(intent, 2)
// onActivityResult()
// if requestCode ==2
String msg = data.getStringExtra("");
txv.setText(msg)
https://medium.com/@skywing0527/android自學筆記-14-intent用法-範例練習-ad774d2f92ec