Android 数据储存与读取文件

Android 数据储存与读取文件 Android 数据存储与读取:文件 public class MainActivity extends Activity implements View.OnClickListener{ Button btnSave; Button btnRead; EditText edFileName; EditText edFileContent; String fileName; String fileContent; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 获取页面中的组件 btnSave=(Button) findViewById(R.id.btnSave); btnRead=(Button) findViewById(R.id.btnRead); //添加按钮监听 btnSave.setOnClickListener(this); btnRead.setOnClickListener(this); } public void onClick(View v) { edFileName=(EditText) findViewById(R.id.edFileName); edFileContent=(EditText) findViewById(R.id.edContent); fileName=edFileName.getText().toString(); fileContent=edFileContent.getText().toString(); switch (v.getId()) { case R.id.btnSave: save(fileName,fileContent); Toast.makeText(getApplicationContext(), 保存成功～ , 1).show(); break; case R.id.btnRead: edFileContent.setText(read(fileName)); break; } } public void save(String fileName, String fileContent) { try { //创建输出流，模式为私有模式，只能被本应用访问， FileOutputStream outStream = getApplicationContext().openFileOutput(fileName, MODE_PRIVATE); //默认会保存到 /data/data/package name/files下，如果不存在则会创建， outStream.write(fileContent.getBytes()); outStream.close(); } catch (Exception e) { e.printStackTrace(); } } public String read(String fileName) { FileInputStream inputStream; try { inputStream = getApplicationContext().openFileInput(fileName); ByteArrayOutputStream outStream =new ByteArrayOutputStream(); byte[] buffer=new byte[1024]; int len=0; while((len=inputStream.read(buffer))!=-1){ outStream.write(buffer, 0, len); } byte[] data=outStream.toByteArray(); inputStream.close(); outStream.close(); return new String(data); } catch (Exception e) { e.printStackTrace(); } return null; } }