Android之数据存储

核心提示：// We can only read the mediamExternalStorageAvailable = true;mExternalStorageWriteable = false;} else {// Something else is wrong. It may be one of many other

// We can only read the media

mExternalStorageAvailable = true;

mExternalStorageWriteable = false;

} else {

// Something else is wrong. It may be one of many other states, but all we need

// to know is we can neither read nor write

mExternalStorageAvailable = mExternalStorageWriteable = false;

}

boolean mExternalStorageAvailable = false;

boolean mExternalStorageWriteable = false;

String state = Environment.getExternalStorageState();

if (Environment.MEDIA_MOUNTED.equals(state)) {

// We can read and write the media

mExternalStorageAvailable = mExternalStorageWriteable = true;

} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {

// We can only read the media

mExternalStorageAvailable = true;

mExternalStorageWriteable = false;

} else {

// Something else is wrong. It may be one of many other states, but all we need

// to know is we can neither read nor write

mExternalStorageAvailable = mExternalStorageWriteable = false;

}

数据库存储

数据库是在WEB应用中很常用的方式，应用场合比较多，如果不熟，可以去看下官方提供的notepad例子，里面讲sqlite的操作，写的比较清楚，这里提供一个简单的示例如下：

Java代码

public class MyDbOpenHelper extends SQLiteOpenHelper {

private static final int DATABASE_VERSION = 2;

private static final String DICTIONARY_TABLE_NAME = "dictionary";

private static final String DICTIONARY_TABLE_CREATE =

"CREATE TABLE " + DICTIONARY_TABLE_NAME + " (" +

KEY_WORD + " TEXT, " +

KEY_DEFINITION + " TEXT);";

DictionaryOpenHelper(Context context) {

super(context, DATABASE_NAME, null, DATABASE_VERSION);

}

@Override

public void onCreate(SQLiteDatabase db) {