android中的数据存储（1）-优快云博客

本文详细介绍了Android应用中使用SharedPreferences和文件进行数据存储的方法，包括如何将数据保存到preferences和文件中，以及如何从preferences和文件中读取数据。

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（1）数据存储之Shared Preferences:用来存储“key-value”格式的数据

    public static final String PREFS_NAME = "MyPrefsFile";

    Boolean mbMusic = false;


//保存到preferences：
     SharedPreferences settings = getPreferences(0);//或者SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
     settings.edit()
             .putBoolean("bMusic", mbMusic)
             .commit();

//读取preferences
    SharedPreferences settings = getPreferences(0);//或者SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
    settings.getBoolean("bMusic", false);

（2）数据存储之Files

public class ReadWrite extends Activity {
private static final String str  = "文件输入输出练习";
/** Called when the activity is first created. */
    TextView textView ;
    String fileName = "aa.txt";
    String result;
public static final String PREFS_NAME = "MyPrefsFile";
    Boolean mbMusic = false;
    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textView = (TextView) findViewById(R.id.textView);
        WirteData(fileName,str);//写数据
        result=ReadData("aa.txt");//读取数据
        textView.setText(result);
    }
private String ReadData(String fileName) {
// TODO Auto-generated method stub
        String result = "";
try {
            FileInputStream fin=openFileInput(fileName);
int length = fin.available();
byte[] buffer = new byte[length];
            fin.read(buffer);
            result = EncodingUtils.getString(buffer, "UTF-8");
            fin.close();
        } catch (Exception e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }
return result;

    }
private void WirteData(String fileName, String str) {
// TODO Auto-generated method stub
        try {
             FileOutputStream fout=openFileOutput(fileName, MODE_PRIVATE);
byte [] buffer = str.getBytes();
             fout.write(buffer);
             fout.close();
        } catch (Exception e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}