本文介绍了Glide实现超简单的图片下载功能,具体步骤如下:
添加依赖
compile 'com.github.bumptech.glide:glide:3.7.0'
添加权限
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
工具类代码
public class SDFileHelper {
private Context context;
public SDFileHelper() {
}
public SDFileHelper(Context context) {
super();
this.context = context;
}
//Glide保存图片
public void savePicture(final String fileName, String url){
Glide.with(context).load(url).asBitmap().toBytes().into(new SimpleTarget<byte[]>() {
@Override
public void onResourceReady(byte[] bytes, GlideAnimation<? super byte[]> glideAnimation) {
try {
savaFileToSD(fileName,bytes);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
//往SD卡写入文件的方法
public void savaFileToSD(String filename, byte[] bytes) throws Exception {
//如果手机已插入sd卡,且app具有读写sd卡的权限
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
String filePath = Environment.getExternalStorageDirectory().getCanonicalPath()+"/budejie";
File dir1 = new File(filePath);
if (!dir1.exists()){
dir1.mkdirs();
}
filename = filePath+ "/" + filename;
//这里就不要用openFileOutput了,那个是往手机内存中写数据的
FileOutputStream output = new FileOutputStream(filename);
output.write(bytes);
//将bytes写入到输出流中
output.close();
//关闭输出流
Toast.makeText(context, "图片已成功保存到"+filePath, Toast.LENGTH_SHORT).show();
} else Toast.makeText(context, "SD卡不存在或者不可读写", Toast.LENGTH_SHORT).show();
}
}
然后再需要的地方调用
SDFileHelper helper = new SDFileHelper(MainActivity.this);
helper.savePicture("bg.jpg",url);