Android 文件读写源码

public class MainActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button = (Button) this.findViewById(R.id.button); button.setOnClickListener(new ButtonClickListener()); } private final class ButtonClickListener implements View.OnClickListener{ public void onClick(View v) { EditText filenameText = (EditText) findViewById(R.id.filename); EditText contentText = (EditText) findViewById(R.id.filecontent); String filename = filenameText.getText().toString(); String content = contentText.getText().toString(); FileService service = new FileService(getApplicationContext()); try { //判断SDCard是否存在，并且可以读写 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ service.saveToSDCard(filename, content); Toast.makeText(getApplicationContext(), R.string.success, 1).show(); }else{ Toast.makeText(getApplicationContext(), R.string.sdcarderror, 1).show(); } } catch (Exception e) { Toast.makeText(getApplicationContext(), R.string.fail, 1).show(); e.printStackTrace(); } } } }