保存数据（2）java 原生文件存储示例

try

		{
			//保存数据
			OutputStream os = openFileOutput("file.txt", Activity.MODE_PRIVATE);
			String str1 = "《文件存储测试》";
			os.write(str1.getBytes("utf-8"));
			os.close();

			//读取数据
			InputStream is = openFileInput("file.txt");
			byte[] buffer = new byte[100];
			int byteCount = is.read(buffer);
			String str2 = new String(buffer, 0, byteCount, "utf-8");
			TextView textView = (TextView)findViewById(R.id.textview);
			textView.setText(str2);			
			is.close();
		}
		catch (Exception e) {
			
		}

下面是文件存储示例

try
		{
			//存储文件
			FileOutputStream fos = new FileOutputStream(
					android.os.Environment.getExternalStorageDirectory()
							+ "/image.jpg");
			InputStream is = getResources().getAssets().open("image.jpg");

			byte[] buffer = new byte[8192];
			int count = 0;
			while ((count = is.read(buffer)) >= 0)
			{
				fos.write(buffer, 0, count);
			}
			fos.close();
			is.close();
			Toast.makeText(this, "已成功将图像文件写到SD卡上.", Toast.LENGTH_LONG).show();
		}
		catch (Exception e)
		{
			Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
		}

//读取文件
		String filename = android.os.Environment.getExternalStorageDirectory()
				+ "/image.jpg";
		
		if (!new File(filename).exists())
		{
			Toast.makeText(this, "还没有往SD卡写入图像文件", Toast.LENGTH_LONG).show();
			return;
		}
		ImageView imageView = (ImageView) findViewById(R.id.imageview);
		try
		{
			FileInputStream fis = new FileInputStream(filename);
			Bitmap bitmap = BitmapFactory.decodeStream(fis);
			imageView.setImageBitmap(bitmap);

			fis.close();
		}
		catch (Exception e)
		{
			// TODO: handle exception
		}