IO --(1) create a flie in SDCard

Create a file in the SDCard


public class IO_SDCardActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     
      //判斷SD卡是否存在
        if (!Environment.getExternalStorageState().equals(Environment.MEDIA_REMOVED)) {
        try {
        //取得SD卡路徑
        File SDCardpath = Environment.getExternalStorageDirectory();
        File myDataPath = new File (SDCardpath.getAbsolutePath() + "/fileio");
        if (!myDataPath.exists()){ // 如果SDCard底下沒有此資料夾，請產生新的資料夾
        myDataPath.mkdirs();
        //將資料寫入到SD卡
        FileWriter mFile = new FileWriter(SDCardpath.getAbsolutePath() + "/fileio/test01.txt");
        mFile.write("This is a test. 這是個實驗啦。");
        mFile.close();
        }else {                    //如果已經有了，直接產生新的檔案
        //將資料寫入到SD卡
        FileWriter mFile = new FileWriter(SDCardpath.getAbsolutePath() + "/fileio/test01.txt");
        mFile.write("This is a test. 這是個實驗啦。");
        mFile.close();
        }
       
        }catch (Exception e) {
        e.printStackTrace();
        }
        }else {
        Toast.makeText(this, "Please add <uses-permission android:name=\"android.permission.WRITE_EXTERNAL_STORAGE\"/> in Manifest.xml", Toast.LENGTH_SHORT).show();
        }
    }// end of onCreate()
}