想必多少都會遇到想暫存資料
是圖片那還有很多資訊可找
但如果是自訂的物件呢?
用 SharedPreferences 又有型別的限制
讓人超級頭痛的
這幾天不斷的用G大神搜索，終於在GitHub找到超好用的Class
但前提是，必須要將物件序列化 implements Serializable
import android.content.Context;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
public class SimpleObjectCache {
public static void saveObject(Object object, String id,Context context) {
try {
ObjectOutput out = new ObjectOutputStream(new FileOutputStream(
new File(context.getCacheDir(), "") + "/"+id));
out.writeObject(object);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static Object loadObject(String id,Context context)
throws FileNotFoundException {
Object object = null;
ObjectInputStream in = null;
try {
in = new ObjectInputStream(new FileInputStream(
new File(new File(context.getCacheDir(), "") + "/"+id)));
object = in.readObject();
in.close();
}catch (IOException | ClassNotFoundException e){
throw new FileNotFoundException();
}
return object;
}
public static Boolean removeObject(String id,Context context){
File file = new File(new File(context.getCacheDir(), "") + "/"+id);
return file.delete();
}
}
* 服用方式
final String ID_BANDS = "bandsObejct";
// List of bands
ArrayList<String> bands = new ArrayList<String>();
bands.add("Arctic Monkeys");
bands.add("Led Zeppelin");
bands.add("Yann Tiersen");
// Saving
SimpleObjectCache.saveObject(bands, ID_BANDS, getApplicationContext());
// Retrieving
try {
ArrayList<String> bandsTemp = (ArrayList<String>) SimpleObjectCache
.loadObject(ID_BANDS, getApplicationContext());
for (String string : bandsTemp) {
Log.d("BANDS", string);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// Deleting
Boolean wasRemoved = SimpleObjectCache.removeObject(ID_BANDS,
getApplicationContext());
資料來源 : https://github.com/wesleiwpa/simple-object-cache-android
