SharedPreferences 存/取图片

public class Sharedprefrernces extends Activity {
   private ImageView imageView;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		imageView  = (ImageView) findViewById(R.id.imageView1);
		SharedPreferences sharedprefrernces = getSharedPreferences("base64", Activity.MODE_PRIVATE);
		Editor editor = sharedprefrernces.edit();
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		BitmapFactory.decodeResource(getResources(), R.drawable.home).compress(CompressFormat.JPEG, 50, baos);//将图片home压缩写到base64这个文件里
		String imageBase64 = new String(Base64.encode(baos.toByteArray(), Base64.DEFAULT)); //对压缩的字节base 编码
		editor.putString("image", imageBase64);// 保存转换后的base64格式字节
		editor.commit();
		try {
			baos.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		readData();
	}
	private void readData() {
		SharedPreferences sharedprefrernces = getSharedPreferences("base64", Activity.MODE_PRIVATE);
		String imageBase = sharedprefrernces.getString("image", "");
		byte[] iamgeBytes = Base64.decode(imageBase.getBytes(),Base64.DEFAULT); //解码
		ByteArrayInputStream bais = new ByteArrayInputStream(iamgeBytes);
		imageView.setImageDrawable(Drawable.createFromStream(bais, "image"));
		try {
			bais.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
 
}