package com.camnter.newlife.ui.activity.rx;
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.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.camnter.newlife.R;
import com.camnter.newlife.core.activity.BaseAppCompatActivity;
import com.camnter.newlife.utils.ImageUtil;
import com.camnter.newlife.utils.ThreadUtils;
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;
import rx.Observable;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
/**
* Description：RxAsyncActivity
* Created by：CaMnter
* Time：2015-12-01 15:49
*/
public class RxAsyncActivity extends BaseAppCompatActivity implements View.OnClickListener {
private static final String TAG = "RxAsyncActivity";
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(RxAsyncActivity.this);
private ImageView asyncRxOneIV;
private ImageView asyncRxTwoIV;
private Button asyncRxSaveBT;
private CustomProgressBarDialog dialog;
/**
* Fill in layout id
*
* @return layout id
*/
@Override protected int getLayoutId() {
return R.layout.activity_rx_async;
}
/**
* Initialize the view in the layout
*
* @param savedInstanceState savedInstanceState
*/
@Override protected void initViews(Bundle savedInstanceState) {
TextView syncRxSaveTV = (TextView) this.findViewById(R.id.rx_async_save_tv);
syncRxSaveTV.setText(OBJECT_IMAGE_URL);
this.asyncRxOneIV = (ImageView) this.findViewById(R.id.rx_async_one_iv);
this.asyncRxTwoIV = (ImageView) this.findViewById(R.id.rx_async_two_iv);
this.asyncRxSaveBT = (Button) this.findViewById(R.id.rx_async_save_bt);
this.dialog = new CustomProgressBarDialog(this);
}
@Override protected void initListeners() {
this.asyncRxSaveBT.setOnClickListener(this);
}
/**
* Initialize the Activity data
*/
@Override protected void initData() {
}
/**
* 检查线程
*/
private void checkThread(String info) {
Log.i(TAG, ThreadUtils.getThreadMsg(info));
}
/**
* 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.rx_async_save_bt:
/**
* create添加OnSubscribe对象（观察者）
* 此时要实现OnSubscribe（观察者）的call方法，如果是异步的话，这里的call就应该写后台的I/O操作
* 当你调用了subscribe方法时，就会自动调用OnSubscribe对象（观察者）的call方法去执行
* （可以参考subscribe方法的源码）
* 失败会走到onError方法
* 成功的话，因为call方法有Subscriber对象，这是添加的订阅者，可以调用它的onNext或onCompleted
*
*
* subscribeOn(Schedulers.io()) 表示观察者做子线程I/O操作
* observeOn(AndroidSchedulers.mainThread()) 表示订阅者做主线程操作
*/
Observable.create((Observable.OnSubscribe<String>) subscriber -> {
RxAsyncActivity.this.checkThread("create -> OnSubscribe.create()");
new DownloadImageAsyncTask(RxAsyncActivity.this, subscriber)
.execute(OBJECT_IMAGE_URL);
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<String>() {
@Override public void onCompleted() {
}
@Override public void onError(Throwable e) {
}
@Override public void onNext(String s) {
RxAsyncActivity.this.checkThread("create -> Subscriber.onNext()");
/**
* 设置按钮可用，并隐藏Dialog
*/
RxAsyncActivity.this.asyncRxSaveBT.setEnabled(true);
RxAsyncActivity.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(s, screenWidth,
screenHeight);
RxAsyncActivity.this.asyncRxOneIV.setImageBitmap(bitmap);
RxAsyncActivity.this.asyncRxTwoIV.setImageBitmap(bitmap);
}
});
break;
}
}
@Override protected void onDestroy() {
super.onDestroy();
this.dialog.dismiss();
}
/**
* 刷新Dialog显示的进度
*/
private static class LoadingHandler extends Handler {
private final WeakReference<RxAsyncActivity> mActivity;
public LoadingHandler(RxAsyncActivity activity) {
mActivity = new WeakReference<>(activity);
}
/**
* Subclasses must implement this to receive messages.
*/
@Override public void handleMessage(Message msg) {
final RxAsyncActivity activity = this.mActivity.get();
if (activity != null) {
switch (msg.what) {
case HANDLER_LOADING: {
final int progressValue = (int) msg.obj;
activity.runOnUiThread(() -> {
try {
activity.dialog.setLoadPrompt(progressValue + "%");
activity.dialog.show();
} catch (Exception ignored) {
}
});
break;
}
}
}
}
}
/**
* 下载图片异步任务
*/
public class DownloadImageAsyncTask extends AsyncTask<String, Integer, String> {
private Activity activity;
private String localFilePath;
private Subscriber<? super String> subscriber;
public DownloadImageAsyncTask(Activity activity, Subscriber<? super String> subscriber) {
super();
this.activity = activity;
this.subscriber = subscriber;
}
/**
* 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();
//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) {
/**
* 通知订阅者
*/
subscriber.onNext(localFilePath);
subscriber.onCompleted();
}
/**
* 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 = RxAsyncActivity.this.loadingHandler.obtainMessage();
message.obj = values[0];
message.what = HANDLER_LOADING;
// 给主线程Handler发送消息
RxAsyncActivity.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
*/
RxAsyncActivity.this.asyncRxSaveBT.setEnabled(true);
super.onCancelled();
}
}
}