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Bui 11: Data Storage External Storage BT1: (External Storage) Th Nh

Xy dng ng dng Android n gin

- Ghi 1 on vn bn nhp vo file abc_in_sdcard.txt - c li file abc_in_sdcard.txt lu

Yu cu:

Xy dng phng thc kiemtra_thenho() dng kim tra tnh trng th nh, tr v 0 hay 1 hay 2.

Trong trng hp th nh cho php, thc hin cc thao tc ghi, c file vn bn n gin.

Khai bo cp php ghi vo th nh trong tp tin AndroidManifest.xml

Kim tra th nh ca my gi lp Simulator thc s c file abc_in_sdcard cha?

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TRUNG TM O TO MNG MY TNH NHT NGH I TC O TO CA MICROSOFT TI VIT NAM 105 B Huyn Thanh Quan, Q3, TP. HCM Tel: 3.9322.735-0913.735.906 Fax: 3.9322.734 Web: nhatnghe.com

public class Demo_externalActivity extends Activity { EditText et1; Button b1,b2,b3; public int kiemtra_thenho(){ // 2: read and write; 1: read only ; 0: cannot read/write int temp=0; String state=Environment.getExternalStorageState(); if (Environment.MEDIA_MOUNTED.equals(state)) temp=2; else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) temp=1; return temp; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); et1=(EditText) findViewById(R.id.editText1); b1=(Button) findViewById(R.id.button1); b2=(Button) findViewById(R.id.button2); b3=(Button) findViewById(R.id.button3); b1.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { et1.setText(""); } }); b2.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { try{ File myFile = new File("/sdcard/abc_in_sdcard.txt"); myFile.createNewFile(); FileOutputStream fOut = new FileOutputStream(myFile); String chuoi=et1.getText().toString(); fOut.write(chuoi.getBytes()); fOut.close(); Toast.makeText(getBaseContext(), "Thnh cng ghi tp tin 'abc_in_sdcard.txt'", Toast.LENGTH_SHORT).show(); } catch (Exception e) { Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show(); } } }); b3.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { try { File myFile = new File("/sdcard/abc_in_sdcard.txt");

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TRUNG TM O TO MNG MY TNH NHT NGH I TC O TO CA MICROSOFT TI VIT NAM 105 B Huyn Thanh Quan, Q3, TP. HCM Tel: 3.9322.735-0913.735.906 Fax: 3.9322.734 Web: nhatnghe.com

FileInputStream fIn = new FileInputStream(myFile); int size=fIn.available(); byte[] buffer=new byte[size]; fIn.read(buffer); fIn.close(); String chuoi=new String(buffer); et1.setText(chuoi); Toast.makeText(getBaseContext(), "Thnh cng c tp tin 'abc_in_sdcard.txt'", Toast.LENGTH_SHORT).show(); } catch (Exception e) { Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show(); } } }); }

}

BT2 (External Storage):

Dng DDMS (Dalvik Debug Monitoring Service) chp 1 s file hnh nh, mp3, video vo th nh ca my gi lp.

Xy dng ln lt cc ng dng Android n gin

- Hin th cc hnh nh t th nh - Play 1 file mp3 t th nh - Play 1 file video t th nh.