Android内存优化（一）字符串优化-一一网

字符串冗余

某些情况下内存中存在大量重复字符串对象，下面是简单的案例

data1中存放的是字符串常量池中”aaa…aaa”的引用；data2中存放的是堆中字符串”bbb…bbb”的引用；data3中存放的是字符串常量池”ccc…ccc”的地址。

class MainActivity : AppCompatActivity() {
    lateinit var binding: ActivityMainBinding
    val data1: Array<String?> = arrayOfNulls(1000)
    val data2: Array<String?> = arrayOfNulls(1000)
    val data3: Array<String?> = arrayOfNulls(1000)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
    }

    override fun onResume() {
        super.onResume()
        binding.button.setOnClickListener {
            Log.i(TAG, "onResume: 填充数据")
            for (i in data1.indices) {
                data1[i] =
                    "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
            }
            for (i in data2.indices) {
                val str =
                    StringBuilder("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb")
                data2[i] = str.toString()
            }
            for (i in data3.indices) {
                val str =
                    StringBuilder("cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc")
                data3[i] = str.toString().intern()
            }
            Log.i(TAG, "onResume: 填充完毕")
        }

    }

}
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