Android Bundle putBinder传输超过1MB数据，Kotlin

Android Bundle putBinder传输超过1MB数据，Kotlin

由于Android系统架构的设计，Activity/Fragment之间通过Intent在Bundle塞进数据进行传输时候，如果数据超过1MB，会抛JE：

关于TransactionTooLargeException：

但是新版Android系统可用通过在Bundle里面的putBinder传输超过1MB的数据，甚至直接可用传递更大的Bitmap：

import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.os.Binder
import android.os.Bundle
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {
    private val TAG = "fly"

    private val KEY = "key"
    private var mBitmap: Bitmap? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        Log.d(TAG, "onCreate savedInstanceState=${savedInstanceState?.size()}")
        val bmp = (savedInstanceState?.getBinder(KEY) as? MyBinder)?.getBitmap()
        if (bmp != null) {
            Log.d(TAG, "onCreate bmp != null bmp=${bmp.byteCount}")
            mBitmap = bmp
        } else {
            lifecycleScope.launch(Dispatchers.IO) {
                mBitmap = BitmapFactory.decodeResource(resources, R.mipmap.p4m)
                Log.d(TAG, "mBitmap=${mBitmap?.byteCount}")
            }
        }
    }

    override fun onDestroy() {
        super.onDestroy()

        Log.d(TAG, "onDestroy")
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)

        Log.d(TAG, "onSaveInstanceState outState=${outState.size()}")
        outState.putBinder(KEY, MyBinder(mBitmap!!))
        Log.d(TAG, "onSaveInstanceState putBinder outState=${outState.size()}")
    }

    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
        super.onRestoreInstanceState(savedInstanceState)

        Log.d(TAG, "onRestoreInstanceState outState=${savedInstanceState.size()}")
        val bmp = (savedInstanceState.getBinder(KEY) as? MyBinder)?.getBitmap()
        Log.d(TAG, "onRestoreInstanceState bmp=${bmp?.byteCount}")
    }

    class MyBinder : Binder {
        private var bitmap: Bitmap? = null

        constructor(bmp: Bitmap) {
            this.bitmap = bmp
        }

        fun getBitmap(): Bitmap? {
            return bitmap
        }
    }
}

Activity启动后：

当切换黑夜模式/深色主题后，当前Activity消耗重建，但Bundle数据会被存储和传输：

而如果在onCreate()里面，清除Bundle，那么就不会再有累积的数据：

savedInstanceState?.clear()

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