package com.camnter.newlife.ui.activity;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.camnter.newlife.R;
import com.camnter.newlife.core.activity.BaseAppCompatActivity;
import com.camnter.newlife.utils.ImageUtil;
import com.camnter.newlife.widget.CustomProgressBarDialog;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.WeakReference;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.UUID;
/**
* Description：DownloadImageToGalleryActivity
* Created by：CaMnter
* Time：2015-10-20 15:00
*/
public class DownloadImageToGalleryActivity extends BaseAppCompatActivity
implements View.OnClickListener {
private static final String OBJECT_IMAGE_URL = "http://img.blog.csdn.net/20150913233900119";
private static final int HANDLER_LOADING = 262;
private final LoadingHandler loadingHandler = new LoadingHandler(
DownloadImageToGalleryActivity.this);
private Button saveBT;
private ImageView saveIV;
private CustomProgressBarDialog dialog;
/**
* Fill in layout id
*
* @return layout id
*/
@Override protected int getLayoutId() {
return R.layout.activity_download_image_save_to_gallery;
}
/**
* Initialize the view in the layout
*
* @param savedInstanceState savedInstanceState
*/
@Override protected void initViews(Bundle savedInstanceState) {
this.saveBT = (Button) this.findViewById(R.id.save_bt);
this.saveIV = (ImageView) this.findViewById(R.id.save_iv);
this.dialog = new CustomProgressBarDialog(this);
}
/**
* Initialize the View of the listener
*/
@Override protected void initListeners() {
this.saveBT.setOnClickListener(this);
}
/**
* Initialize the Activity data
*/
@Override protected void initData() {
((TextView) this.findViewById(R.id.save_tv)).setText(OBJECT_IMAGE_URL);
}
/**
* Called when a view has been clicked.
*
* @param v The view that was clicked.
*/
@Override public void onClick(View v) {
switch (v.getId()) {
case R.id.save_bt: {
v.setEnabled(false);
/**
* 设置按钮不可用，开始执行任务
*/
new DownloadImageAsyncTask(this).execute(OBJECT_IMAGE_URL);
break;
}
}
}
/**
* 刷新Dialog显示的进度
*/
private static class LoadingHandler extends Handler {
private final WeakReference<DownloadImageToGalleryActivity> mActivity;
public LoadingHandler(DownloadImageToGalleryActivity activity) {
mActivity = new WeakReference<>(activity);
}
/**
* Subclasses must implement this to receive messages.
*/
@Override public void handleMessage(Message msg) {
DownloadImageToGalleryActivity activity = this.mActivity.get();
if (activity != null) {
switch (msg.what) {
case HANDLER_LOADING: {
int progressValue = (int) msg.obj;
activity.dialog.setLoadPrompt(progressValue + "%");
activity.dialog.show();
break;
}
}
}
}
}
/**
* 下载图片异步任务
*/
public class DownloadImageAsyncTask extends AsyncTask<String, Integer, String> {
private Activity activity;
private String localFilePath;
public DownloadImageAsyncTask(Activity activity) {
super();
this.activity = activity;
}
/**
* 对应AsyncTask第一个参数
* 异步操作，不在主UI线程中，不能对控件进行修改
* 可以调用publishProgress方法中转到onProgressUpdate(这里完成了一个handler.sendMessage(...)的过程)
*
* @param params The parameters of the task.
* @return A result, defined by the subclass of this task.
* @see #onPreExecute()
* @see #onPostExecute
* @see #publishProgress
*/
@Override protected String doInBackground(String... params) {
URL fileUrl = null;
try {
fileUrl = new URL(params[0]);
} catch (MalformedURLException e) {
e.printStackTrace();
}
if (fileUrl == null) return null;
try {
HttpURLConnection connection = (HttpURLConnection) fileUrl.openConnection();
connection.setRequestMethod("GET");
connection.setDoInput(true);
connection.connect();
//计算文件长度
int lengthOfFile = connection.getContentLength();
/**
* 不存在SD卡，就放到缓存文件夹内
*/
File cacheDir = this.activity.getCacheDir();
File downloadFile = new File(cacheDir, UUID.randomUUID().toString() + ".jpg");
this.localFilePath = downloadFile.getPath();
if (!downloadFile.exists()) {
File parent = downloadFile.getParentFile();
if (parent != null) parent.mkdirs();
}
FileOutputStream output = new FileOutputStream(downloadFile);
InputStream input = connection.getInputStream();
InputStream bitmapInput = connection.getInputStream();
//下载
byte[] buffer = new byte[1024];
int len;
long total = 0;
// 计算进度
while ((len = input.read(buffer)) > 0) {
total += len;
this.publishProgress((int) ((total * 100) / lengthOfFile));
output.write(buffer, 0, len);
}
output.close();
input.close();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 对应AsyncTask第三个参数 (接受doInBackground的返回值)
* 在doInBackground方法执行结束之后在运行，此时已经回来主UI线程当中 能对UI控件进行修改
*
* @param string The result of the operation computed by {@link #doInBackground}.
* @see #onPreExecute
* @see #doInBackground
* @see #onCancelled(Object)
*/
@Override protected void onPostExecute(String string) {
/**
* 设置按钮可用，并隐藏Dialog
*/
DownloadImageToGalleryActivity.this.saveBT.setEnabled(true);
DownloadImageToGalleryActivity.this.dialog.hide();
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int screenWidth = metrics.widthPixels;
int screenHeight = metrics.heightPixels;
/**
* ImageUtil.decodeScaleImage 解析图片
*/
Bitmap bitmap = ImageUtil.decodeScaleImage(this.localFilePath, screenWidth,
screenHeight);
DownloadImageToGalleryActivity.this.saveIV.setImageBitmap(bitmap);
/**
* 保存图片到相册
*/
String imageName = System.currentTimeMillis() + ".jpg";
MediaStore.Images.Media.insertImage(
DownloadImageToGalleryActivity.this.getApplicationContext()
.getContentResolver(), bitmap, imageName,
"camnter");
Toast.makeText(this.activity, "已保存：" + imageName, Toast.LENGTH_LONG).show();
}
/**
* 对应AsyncTask第二个参数
* 在doInBackground方法当中，每次调用publishProgress方法都会中转(handler.sendMessage(...))到onProgressUpdate
* 在主UI线程中，可以对控件进行修改
*
* @param values The values indicating progress.
* @see #publishProgress
* @see #doInBackground
*/
@Override protected void onProgressUpdate(Integer... values) {
// 主线程Handler实例消息
Message message = DownloadImageToGalleryActivity.this.loadingHandler.obtainMessage();
message.obj = values[0];
message.what = HANDLER_LOADING;
// 给主线程Handler发送消息
DownloadImageToGalleryActivity.this.loadingHandler.handleMessage(message);
}
/**
* 运行在主UI线程中，此时是预执行状态，下一步是doInBackground
*
* @see #onPostExecute
* @see #doInBackground
*/
@Override protected void onPreExecute() {
super.onPreExecute();
}
/**
* <p>Applications should preferably override {@link #onCancelled(Object)}.
* This method is invoked by the default implementation of
* {@link #onCancelled(Object)}.</p>
* <p/>
* <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
* {@link #doInBackground(Object[])} has finished.</p>
*
* @see #onCancelled(Object)
* @see #cancel(boolean)
* @see #isCancelled()
*/
@Override protected void onCancelled() {
/**
* 设置按钮可用
*/
DownloadImageToGalleryActivity.this.saveBT.setEnabled(true);
super.onCancelled();
}
}
}