首页 > 代码库 > android .txt文件的写入，读取，还有复制图片
android .txt文件的写入，读取，还有复制图片
txt文件的写入：
1 private void save() { 2 FileOutputStream fos = null; 3 String state = Environment.getExternalStorageState();// sd状态 4 if (state.equals(Environment.MEDIA_MOUNTED)) {// 判断sd卡是否可用 5 File root = Environment.getExternalStorageDirectory(); 6 File targeDir = new File(root, super.getPackageName());// 要把文件写相应在activity下 7 8 if (!targeDir.exists()) {// 判断目录是否存在 9 targeDir.mkdir();// 创建10 }11 // String newFile=file.toString()+"/"+"user.txt";12 // IO操作13 // 流14 try {15 // 括号里是路径16 fos = new FileOutputStream(new File(targeDir, "userinfo.txt"));// 输出流17 String content = name;18 /*19 * for(int i=0;i<content.length();i++){20 * fos.write(content.charAt(i));//一个个字节输 }21 */22 byte[] data =http://www.mamicode.com/ content.getBytes();23 fos.write(data);24 25 } catch (FileNotFoundException e) {26 // TODO Auto-generated catch block27 e.printStackTrace();28 } catch (IOException e) {29 // 输入输出都会引发IO异常30 e.printStackTrace();31 } finally {32 // 打开流就需要关闭33 try {34 fos.close();35 } catch (IOException e) {36 // TODO Auto-generated catch block37 e.printStackTrace();38 }39 }40 41 }42 }
txt文件的读取：
1 private void read() { 2 FileInputStream fis = null; 3 String state = Environment.getExternalStorageState(); 4 if (state.equals(Environment.MEDIA_MOUNTED)) { 5 File root = Environment.getExternalStorageDirectory(); 6 File file = new File(root, super.getPackageName() + "/userinfo.txt"); 7 if (file.exists()) { 8 try { 9 fis = new FileInputStream(file);10 int len = 0;11 StringBuilder builder = new StringBuilder();12 byte[] buffer = new byte[1024];13 14 while ((len = fis.read(buffer)) != -1) {15 builder.append(new String(buffer, 0, len));16 // builder.append(buffer);//乱码17 }18 /*19 * while((len=fis.read())!=-1){ builder.append((char)len); }20 */21 Toast.makeText(getApplicationContext(), builder.toString(),22 Toast.LENGTH_SHORT).show();23 text2.setText(builder.toString());24 25 } catch (FileNotFoundException e) {26 // TODO Auto-generated catch block27 e.printStackTrace();28 Log.i("read", e.getMessage());29 } catch (IOException e) {30 // TODO Auto-generated catch block31 e.printStackTrace();32 } finally {33 try {34 fis.close();35 } catch (IOException e) {36 // TODO Auto-generated catch block37 e.printStackTrace();38 }39 }40 }41 }42 }
图片的复制：
先在assets文件夹下建一个image文件夹，里面放一张图片
1 private void copy() { 2 FileOutputStream output = null; 3 InputStream source = null; 4 String state = Environment.getExternalStorageState(); 5 if (state.equals(Environment.MEDIA_MOUNTED)) { 6 // inputstream=super.getResources().openRawResource(R.drawable.ic_launcher); 7 8 try { 9 AssetManager manager = super.getAssets();10 source = manager.open("image/ic_launcher.png");11 File target = new File(12 Environment.getExternalStorageDirectory() + "/"13 + super.getPackageName() + "/mycopyimg.png");14 output = new FileOutputStream(target);15 16 int len = 0;17 byte[] buffer = new byte[1024];18 while ((len = source.read(buffer)) != -1) {19 output.write(buffer, 0, len);20 }21 } catch (IOException e) {22 // TODO Auto-generated catch block23 e.printStackTrace();24 Log.i("111", e.getMessage());25 } finally {26 try {27 source.close();28 output.close();29 } catch (IOException e) {30 // TODO Auto-generated catch block31 e.printStackTrace();32 }33 }34 }35 }
android .txt文件的写入，读取，还有复制图片
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