电脑通过TCP/IP向手机发送文件 发现接收到的APK文件无法安装出现解析包出错

[qq4671019472]

发送的Txt没事 接收到的文件和发送的文件大小是一致的 手机向电脑发送的压缩文件能打开 发送代码如下

if (file.exists()) {
					filePath.setText("文件发送中请稍候");
					long len = file.length();
					try {
						Socket s = new Socket(IP,7777);
						DataOutputStream dos = new DataOutputStream(s.getOutputStream());
						dos.writeUTF(file.getName());
						dos.flush();
						dos.close();
						s.close();
						
						Socket wenjian = new Socket(IP, 6666);
						DataOutputStream out = new DataOutputStream(new BufferedOutputStream(wenjian.getOutputStream()));
						InputStream fi = new FileInputStream(file);
						byte[] buf = new byte[(int)len];
						int offset = 0;
						int numRead = 0;
						while(offset < buf.length && (numRead = fi.read(buf, offset, buf.length - offset)) >= 0 ) {
							offset += numRead;
						}
						
						if (offset != buf.length) {
							System.out.print("chucuo");
							filePath.setText("文件发送出错请重新发送");
						}
						fi.close();
						out.write(buf);
						out.flush();
						out.close();
						wenjian.close();
						//send.setClickable(true);
						filePath.setText("文件发送完毕");
					} catch (UnknownHostException e) {
						e.printStackTrace();
					} catch (IOException e) {
						e.printStackTrace();
					}
				} else {
					Toast.makeText(Tab1Activity.this, "文件路径有误请重新填写或选择", Toast.LENGTH_SHORT).show();
				}
			}