Android中常见的数据存储方式，存文件和存 SharedPrefrence , 他们都是存在在/data/data/com.xxxx.xxxx/ 下面。 常用写法如下：
package com.example.file;
import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter;
import android.content.Context; import android.content.SharedPreferences;
public class FileAdapter { private static final String NAME = “data”; private Context mContext;
private SharedPreferences mSp; private SharedPreferences.Editor mSpEditor; public FileAdapter(Context context) { mContext = context; initSharedPreference(); } public void saveStr(String inputTxt) { FileOutputStream outstream = null; BufferedWriter writer = null; try { outstream = mContext.openFileOutput(NAME, Context.MODE_PRIVATE); writer = new BufferedWriter(new OutputStreamWriter(outstream)); writer.write(inputTxt); } catch (IOException e) { e.printStackTrace(); } finally { try { if (writer != null) { writer.close(); } } catch (IOException e2) { e2.printStackTrace(); } } } public String getStr() { FileInputStream instream = null; BufferedReader reader = null; StringBuilder content = new StringBuilder(); try { instream = mContext.openFileInput(NAME); reader = new BufferedReader(new InputStreamReader(instream)); String line = ""; while ((line = reader.readLine()) != null) { content.append(line); } } catch (IOException e) { e.printStackTrace(); } finally { try { if (reader != null) { reader.close(); } } catch (IOException e2) { e2.printStackTrace(); } } return content.toString(); } private void initSharedPreference() { mSp = mContext.getSharedPreferences("sp", Context.MODE_PRIVATE); mSpEditor = mSp.edit(); } // sp put int public void putSpString(String key, String value) { if (mSp != null && mSpEditor != null) { mSpEditor.putString(key, value); mSpEditor.commit(); } } public String getSpString(String key) { if (mSp != null) { return mSp.getString(key, ""); } return null; }}
