在Android中读取/写入结果代码

try {
    File file = new File("path/to/file");
    FileInputStream fis = new FileInputStream(file);
    InputStreamReader isr = new InputStreamReader(fis);
    BufferedReader br = new BufferedReader(isr);

    String line;
    while ((line = br.readLine()) != null) {
        // 处理每一行数据
    }

    br.close();
    isr.close();
    fis.close();
} catch (IOException e) {
    e.printStackTrace();
}

SharedPreferences sharedPreferences = getSharedPreferences("my_prefs", Context.MODE_PRIVATE);
String value = sharedPreferences.getString("key", "");

SQLiteDatabase db = dbHelper.getReadableDatabase();
String[] projection = { "column1", "column2" };
String selection = "column1 = ?";
String[] selectionArgs = { "value" };
Cursor cursor = db.query("table_name", projection, selection, selectionArgs, null, null, null);

if (cursor.moveToFirst()) {
    do {
        // 处理每一行数据
    } while (cursor.moveToNext());
}

cursor.close();
db.close();

try {
    File file = new File("path/to/file");
    FileOutputStream fos = new FileOutputStream(file);
    OutputStreamWriter osw = new OutputStreamWriter(fos);
    BufferedWriter bw = new BufferedWriter(osw);

    bw.write("data to write");
    bw.newLine();

    bw.close();
    osw.close();
    fos.close();
} catch (IOException e) {
    e.printStackTrace();
}

SharedPreferences sharedPreferences = getSharedPreferences("my_prefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("key", "value");
editor.apply();

SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("column1", "value1");
values.put("column2", "value2");
long newRowId = db.insert("table_name", null, values);
db.close();