Java 下载的图像无法';无法保存在SD卡路径中
此处无法保存OutputStream路径文件 包com.exampleJava 下载的图像无法';无法保存在SD卡路径中,java,android,image,file,sd-card,Java,Android,Image,File,Sd Card,此处无法保存OutputStream路径文件 包com.example import java.io.BufferedInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.net.URL; import java.net.URLConnection; import android.app.Activity; import
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class download extends Activity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private Button startBtn;
private ProgressDialog mProgressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startBtn = (Button)findViewById(R.id.startBtn);
startBtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
startDownload();
}
});
}
private void startDownload() {
String url = "http://farm1.static.flickr.com/114/298125983_0e4bf66782_b.jpg";
new DownloadFileAsync().execute(url);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_DOWNLOAD_PROGRESS:
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Downloading file..");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
class DownloadFileAsync extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
@Override
protected String doInBackground(String... aurl) {
int count;
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/some_photo_from_gdansk_poland.jpg");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
@Override
protected void onPostExecute(String unused) {
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
}
}
}
Permission:
<uses-permission android:name="android.permission.INTERNET"/>
import java.io.BufferedInputStream;
导入java.io.FileOutputStream;
导入java.io.InputStream;
导入java.io.OutputStream;
导入java.net.URL;
导入java.net.URLConnection;
导入android.app.Activity;
导入android.app.Dialog;
导入android.app.ProgressDialog;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.widget.Button;
公共类下载扩展了活动{
公共静态最终整型对话框\u下载\u进度=0;
专用按钮startBtn;
private ProgressDialog mProgressDialog;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startBtn=(按钮)findViewById(R.id.startBtn);
setOnClickListener(新的OnClickListener(){
公共void onClick(视图v){
startDownload();
}
});
}
私有void startDownload(){
字符串url=”http://farm1.static.flickr.com/114/298125983_0e4bf66782_b.jpg";
新建DownloadFileAsync().execute(url);
}
@凌驾
受保护的对话框onCreateDialog(int id){
开关(id){
案例对话框\u下载\u进度:
mProgressDialog=新建进度对话框(此);
设置消息(“下载文件…”);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_水平);
mProgressDialog.setCancelable(假);
mProgressDialog.show();
返回mProgressDialog;
违约:
返回null;
}
}
类DownloadFileAsync扩展AsyncTask{
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
showDialog(对话框下载进度);
}
@凌驾
受保护的字符串背景(字符串…aurl){
整数计数;
试一试{
URL=新URL(aurl[0]);
URLConnection conexion=url.openConnection();
conexion.connect();
int lenghtOfFile=conexion.getContentLength();
Log.d(“ANDRO_ASYNC”,“文件长度:“+lenghtOfFile”);
InputStream输入=新的BufferedInputStream(url.openStream());
OutputStream output=新文件OutputStream(“/sdcard/some_photo_from_gdansk_poland.jpg”);
字节数据[]=新字节[1024];
长总计=0;
而((计数=输入。读取(数据))!=-1){
总数+=计数;
出版进度(“+(int)((总计*100)/长度文档));
输出.写入(数据,0,计数);
}
output.flush();
output.close();
input.close();
}捕获(例外e){}
返回null;
}
受保护的void onProgressUpdate(字符串…进度){
Log.d(“ANDRO_ASYNC”,progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
@凌驾
受保护的void onPostExecute(字符串未使用){
dismissDialog(对话框下载进度);
}
}
}
许可:
我找到了
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>