前言
最近在Github上找到一箇中國城市的json文件，雖然也有db文件，但是想通過這個json文件生成自己的數據庫表。下面就簡單來轉換成自己的數據庫
準備json
在Github找到一個下面json表
[
{
"areaId" : "4521984",
"areaName" : "北京",
"cities" : [
{
"areaId" : "4521985",
"areaName" : "北京市",
"counties" : [
{
"areaId" : "4521986",
"areaName" : "東城區"
},
{
"areaId" : "4521987",
"areaName" : "西城區"
},
{
"areaId" : "4521988",
"areaName" : "朝陽區"
},
{
"areaId" : "4521989",
"areaName" : "豐臺區"
},
{
"areaId" : "4521990",
"areaName" : "石景山區"
},
{
"areaId" : "4521991",
"areaName" : "海淀區"
},
{
"areaId" : "4521992",
"areaName" : "門頭溝區"
},
{
"areaId" : "4521993",
"areaName" : "房山區"
},
{
"areaId" : "4521994",
"areaName" : "通州區"
},
{
"areaId" : "4521995",
"areaName" : "順義區"
},
{
"areaId" : "4521996",
"areaName" : "昌平區"
},
{
"areaId" : "4521997",
"areaName" : "大興區"
},
{
"areaId" : "4521998",
"areaName" : "懷柔區"
},
{
"areaId" : "4521999",
"areaName" : "平谷區"
},
{
"areaId" : "4522001",
"areaName" : "密雲縣"
},
{
"areaId" : "4522002",
"areaName" : "延慶縣"
}
]
}
]
}
....
]完整的json文件可Goach_Frame的app 裏面的assets裏面查看
轉換爲相對格式的txt文件
把上文的json文件相對的City.txt文件
0,4521984,0,北京
1,4522003,0,天津
2,4522022,0,河北
3,4522217,0,山西
4,4522359,0,內蒙古
5,4522482,0,遼寧
6,4522611,0,吉林
7,4522689,0,黑龍江
8,4522847,0,上海
9,4522868,0,江蘇
10,4523000,0,浙江
..........代碼如下:
rxPermissions.request(Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_EXTERNAL_STORAGE)
.subscribe({
t: Boolean ->
if(t){
val cityJson = AssetsUtils.getStringForAssets(context,"city.txt")
val mCitys = mGson.fromJson<List<CityResponse>>(cityJson,object: TypeToken<List<CityResponse>>(){}.type)
val stringBuilder = StringBuilder()
//省
mCitys.forEachIndexed { index, cityResponse ->
stringBuilder.append("$index,${cityResponse.areaId},0,${cityResponse.areaName}\n")
}
var cityCount = mCitys.size
//市
mCitys.forEach {
val parentId = it.areaId
it.cities.forEachIndexed { index, city ->
stringBuilder.append("${cityCount+index},${city.areaId},$parentId,${city.areaName}\n")
}
cityCount += it.cities.size
}
//區,縣
mCitys.forEach {
it.cities.forEach {
val parentId = it.areaId
it.counties.forEachIndexed { index, city ->
stringBuilder.append("${cityCount+index},${city.areaId},$parentId,${city.areaName}\n")
}
cityCount += it.counties.size
}
}
AssetsUtils.stringToFile(context,"City.txt",stringBuilder.toString())
}
})AssetsUtils.kt
object AssetsUtils {
fun getStringForAssets(context: Context,name:String):String{
try {
val inputStream = context.assets.open(name)
val br = BufferedReader(InputStreamReader(inputStream))
val sb = StringBuffer()
var len = br.readLine()
while(len != null){
sb.append(len)
len = br.readLine()
}
inputStream.close()
return sb.toString()
}catch (e:FileNotFoundException){
e.printStackTrace()
}
return ""
}
fun stringToFile(context: Context,fileName: String,saveStr:String){
val file = File(getSaveDir(context,"City"),fileName)
if(!file.exists()||file.length() == 0L){
file.deleteOnExit()
file.createNewFile()
file.outputStream().use { it.write(saveStr.toByteArray(Charsets.UTF_8)) }
}
}
private fun getSaveDir(context: Context,uniqueName:String):File{
val cachePath: String
val file = context.getExternalFilesDir(null)
cachePath = if (file != null && (Environment.MEDIA_MOUNTED == Environment.getExternalStorageState() || !Environment.isExternalStorageRemovable())) {
file.path
} else {
context.filesDir.path
}
val targetFile = File(cachePath + File.separator + uniqueName)
if(!targetFile.exists()) targetFile.mkdirs()
return targetFile
}
}CityResponse.kt
class CityResponse:Serializable{
var areaId:Long = 0
var areaName:String = ""
var cities:List<City> = emptyList()
class City(val areaId:Long, val areaName:String,val counties:List<Town>):Serializable
class Town(val areaId:Long, val areaName:String):Serializable
}生成city.db
這時候需要準備一臺已經root的手機或者安裝可以root的模擬器，這裏使用夜神模擬器來做相應的操作
- 首先在Terminal裏把city.txt文件push到相對應用的databases路徑下，如這裏我的路徑是
adb push E:/City.txt data/data/com.goach.client/databases第一個路徑是txt放在電腦上的路徑，第二個路徑需要push的位置。
執行命令成功後
就可以在data/data/com.goach.client/databases看到City.txt文件
然後執行下面幾個命令創建db
adb shell
cd data/data/com.goach.client/databases
sqlite3 City.db執行成功如下
然後創建City表，執行命令和結果如下
.table是查看當前db裏面存在的表
最後把City.txt導入到表裏面
通過,分割，然後導入表裏面就可以了。在databases裏面可以查看City.db
然後把db導出到電腦，最後表如下
