android 读取,写入图片到sd卡源码
16lz
2022-07-28
/** * Save Bitmap to a file.保存图片到SD卡。 * * @param bitmap * @param file * @return error message if the saving is failed. null if the saving is * successful. * @throws IOException */ public static void saveBitmapToFile(Bitmap bitmap, String _file) throws IOException {//_file = getSDPath()+"/xx自定义文件夹/hot.png" BufferedOutputStream os = null; try { File file = new File(_file); // String _filePath_file.replace(File.separatorChar + // file.getName(), ""); int end = _file.lastIndexOf(File.separator); String _filePath = _file.substring(0, end); File filePath = new File(_filePath); if (!filePath.exists()) { filePath.mkdirs(); } file.createNewFile(); os = new BufferedOutputStream(new FileOutputStream(file)); bitmap.compress(Bitmap.CompressFormat.PNG, 100, os); } finally { if (os != null) { try { os.close(); } catch (IOException e) { Log.e(TAG_ERROR, e.getMessage(), e); } } } }//读取public class MainAct extends Activity { /** Called when the activity is first created. */ private ImageView img; //SD图片路径 private String filepath = getSDPath()+"/xx自定义文件夹/hot.png" @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); img = (ImageView) findViewById(R.id.img); File file = new File(filepath); if (file.exists()) { Bitmap bm = BitmapFactory.decodeFile(filepath); //将图片显示到ImageView中 img.setImageBitmap(bm); } }}/** * 获取SDK路径 * @return */public static String getSDPath(){ File sdDir = null; boolean sdCardExist = Environment.getExternalStorageState() .equals(android.os.Environment.MEDIA_MOUNTED); //判断sd卡是否存在 if (sdCardExist) { sdDir = Environment.getExternalStorageDirectory();//获取跟目录 } return sdDir.toString(); }更多相关文章
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