Android下载网络图片并保存在本地相册

package com.thfund.bigtree.StarCounselor.activity;

import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import com.bumptech.glide.Glide;
import com.thfund.bigtree.R;
import com.thfund.bigtree.base.BaseActivity;
import com.thfund.bigtree.utils.ToastUtil;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class StarWeChatQRActivity extends BaseActivity implements View.OnClickListener {
private ImageView showImageView;//显示图片ImageView
private Button mSaveBtn;//保存图片按钮
private String imgURl;//图片的URL地址
private static final int SAVE_SUCCESS = 0;//保存图片成功
private static final int SAVE_FAILURE = 1;//保存图片失败
private static final int SAVE_BEGIN = 2;//开始保存图片
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SAVE_BEGIN:
ToastUtil.showMsg("开始保存图片...");
mSaveBtn.setClickable(false);
break;
case SAVE_SUCCESS:
ToastUtil.showMsg("图片保存成功,请到相册查找");
mSaveBtn.setClickable(true);
break;
case SAVE_FAILURE:
ToastUtil.showMsg("图片保存失败,请稍后再试...");
mSaveBtn.setClickable(true);
break;
}
}
};

/**
* 打开该Activity的一种静态方式
*
* @param context
* @param imgURl
*/
public static void startActivity(Context context, String imgURl) {
Intent intent = new Intent(context, StarWeChatQRActivity.class);
Bundle bundle = new Bundle();
bundle.putString("imgURl", imgURl);
intent.putExtras(bundle);
context.startActivity(intent);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_star_we_chat_qr);
initViews();
initData();
}

/**
* 初始化控件
*/
private void initViews() {
showImageView = (ImageView) findViewById(R.id.image_view);
mSaveBtn = (Button) findViewById(R.id.save_btn);
mSaveBtn.setOnClickListener(this);
}

/**
* 初始化数据
*/
private void initData() {
//我的ImageURL是上一级传参过来的
imgURl = getIntent().getStringExtra("imgURl");
//用Glide将图片加载出来
Glide.with(mContext).load(imgURl).fitCenter().crossFade().into(showImageView);
}

/**
* 点击事件处理
*
* @param v
*/
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.save_btn://保存图片
mSaveBtn.setClickable(false);//不可重复点击
//保存图片必须在子线程中操作，是耗时操作
new Thread(new Runnable() {
@Override
public void run() {
mHandler.obtainMessage(SAVE_BEGIN).sendToTarget();
Bitmap bp = returnBitMap(imgURl);
saveImageToPhotos(mContext, bp);
}
}).start();
break;
}
}

/**
* 保存二维码到本地相册
*/
private void saveImageToPhotos(Context context, Bitmap bmp) {
// 首先保存图片
File appDir = new File(Environment.getExternalStorageDirectory(), "Boohee");
if (!appDir.exists()) {
appDir.mkdir();
}
String fileName = System.currentTimeMillis() + ".jpg";
File file = new File(appDir, fileName);
try {
FileOutputStream fos = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// 其次把文件插入到系统图库
try {
MediaStore.Images.Media.insertImage(context.getContentResolver(),
file.getAbsolutePath(), fileName, null);
} catch (FileNotFoundException e) {
e.printStackTrace();
mHandler.obtainMessage(SAVE_FAILURE).sendToTarget();
return;
}
// 最后通知图库更新
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
Uri uri = Uri.fromFile(file);
intent.setData(uri);
context.sendBroadcast(intent);
mHandler.obtainMessage(SAVE_SUCCESS).sendToTarget();
}

/**
* 将URL转化成bitmap形式
*
* @param url
* @return bitmap type
*/
public final static Bitmap returnBitMap(String url) {
URL myFileUrl;
Bitmap bitmap = null;
try {
myFileUrl = new URL(url);
HttpURLConnection conn;
conn = (HttpURLConnection) myFileUrl.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return bitmap;
}

/**
* 点击除了按钮的任何一个地方，finish掉
*
* @param event
* @return
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
finish();
break;
}
return super.onTouchEvent(event);
}
}