安卓文件操作常用操作写法
1、android下创建目录File sd=Environment.getExternalStorageDirectory();
String path=sd.getPath()+"/files";
File file=new File(path);
if(!file.exists())
file.mkdir();
2、android下创建文件
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet= new HttpGet("http://xxx.com/payload.apk");
HttpResponse httpResponse = httpClient.execute(httpGet);
if(httpResponse.getStatusLine().getStatusCode() == 200){
total_length = httpResponse.getEntity().getContentLength();
is = httpResponse.getEntity().getContent() ;
File file = new File(Environment.getExternalStorageDirectory(), "aupdata.jpg");
fos = new FileOutputStream(file);
bis = new BufferedInputStream(is);
byte[] buffer = new byte;
byte [] result_two = new byte [(int) total_length];
int len = 0;
int total=0;
while((len = bis.read(buffer)) > -1){
System.arraycopy(buffer, 0, result_two, total, len);
fos.write(buffer, 0, len);
total = total + len ;
}
}
FileOutputStream定义文件后。用.write方法写入内容，就能够创建相应文件了。
3、android安装其它apk
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
File install_file = new File(Environment.getExternalStorageDirectory() , "MyWeb.apk");
intent.setDataAndType(Uri.fromFile(install_file), "application/vnd.android.package-archive");
startActivity(intent);
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