glide默认的缓存图片路径地址_Android-Glide-从服务器下载图片至指定SD路径中
1.先封装一个SDFileHelper方法，通过Glide图片加载库保存服务器上的图片
String filePath = Environment.getExternalStorageDirectory() + File.separator + "A1";，自定义图片保存的位置
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() {
@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() + File.separator + "A1";
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();
}
}
2.在事件中调用
public class MainActivity extends AppCompatActivity {
private String url = "http://www.vorin.cn/storage/oilImage/test/tim1.jpeg";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button)findViewById(R.id.btn_get);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SDFileHelper helper = new SDFileHelper(MainActivity.this);
helper.savePicture("tim1.jpeg", url);
}
});
}
}
3.若要加载大量图片
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button)findViewById(R.id.btn_get);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//100要换掉
for (int i = 1; i < 100; i++) {
String url = "http://www.vorin.cn/storage/oilImage/test/tim" + i + ".jpeg";
//取得最后一个/的下标
int index = url.lastIndexOf("/");
//将字符串转为字符数组
char[] ch = url.toCharArray();
//根据 copyValueOf(char[] data, int offset, int count) 取得最后一个字符串
String informationId = String.copyValueOf(ch, index + 1, ch.length - index - 1);
SDFileHelper helper = new SDFileHelper(MainActivity.this);
helper.savePicture(informationId, url);
}
}
});
}
}
上述中i要通过接口获取jsons数据统计文件数量，会在下篇中讲到