这个大家一点儿都不陌生，今天在复习的时候简单写了一个demo，简单记录下，方便以后复习。
这里主要是模拟下载实现，用两种方式实现，对比学习HandlerThread。下面上代码：
///////HandlerThreadActivity.java
/**
* create by xiaoya on 2019-12-04
* des:模拟下载使用HandlerThread的demo；
**/
public class HandlerThreadActivity extends Activity implements View.OnClickListener, Handler.Callback {
/**
* 我是按钮
*/
private TextView mTvBtn;
private Handler handler;
private DownLoadThread handlerThread;
private MyHandlerThread myHandlerThread;
/**
* 开始下载
*/
private TextView mTvStart;
/**
* 完成下载
*/
private TextView mTvFinish;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_handlerthread);
initView();
//使用系统的HandlerThread
// initHandlerThread();
//使用自己实现的Handler+Thread；
initMyHandlerThread();
}
private void initHandlerThread(){
handler = new Handler(this);
handlerThread = new DownLoadThread("logReapt");
handlerThread.setUiHandler(handler);
handlerThread.setUrlLists("qqqqqq", "qqwwwwww", "errtttttt", "jjjjjjjjjjjj");
}
private void initMyHandlerThread(){
handler = new Handler(this);
myHandlerThread = new MyHandlerThread("logReapt");
myHandlerThread.setUiHandler(handler);
myHandlerThread.setUrlLists("qqqqqq", "qqwwwwww", "errtttttt", "jjjjjjjjjjjj");
}
private void initView() {
mTvBtn = (TextView) findViewById(R.id.tv_btn);
mTvBtn.setOnClickListener(this);
mTvStart = (TextView) findViewById(R.id.tv_start);
mTvFinish = (TextView) findViewById(R.id.tv_finish);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
default:
break;
case R.id.tv_btn:
// handlerThread.start();
myHandlerThread.start();
mTvBtn.setEnabled(false);
break;
}
}
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case DownLoadThread.TYPE_START:
mTvStart.setText(mTvStart.getText().toString()+" "+msg.obj);
mTvBtn.setVisibility(View.VISIBLE);
break;
case DownLoadThread.TYPE_FINISHED:
mTvFinish.setText(mTvFinish.getText().toString()+" "+msg.obj);
mTvBtn.setVisibility(View.GONE);
break;
default:
break;
}
return true;
}
}
///////DownLoadThread.java
public class DownLoadThread extends HandlerThread implements Handler.Callback {
private final String KEY_URL = "url";
public static final int TYPE_START = 1;
public static final int TYPE_FINISHED = 2;
private Handler uiHandler;
private Handler workerHandler;
private List urlLists;
public DownLoadThread(String name) {
super(name);
}
public DownLoadThread(String name, int priority) {
super(name, priority);
}
@Override
protected void onLooperPrepared() {
super.onLooperPrepared();
workerHandler = new Handler(getLooper(), this);
if (uiHandler == null) {
throw new IllegalArgumentException("not set uiHandler");
}
for (String url : urlLists) {
Message message = workerHandler.obtainMessage();
Bundle bundle = new Bundle();
bundle.putString(KEY_URL, url);
message.setData(bundle);
workerHandler.sendMessage(message);
}
}
public void setUrlLists(String... urls) {
urlLists = Arrays.asList(urls);
}
public Handler getUIHandler() {
return uiHandler;
}
public DownLoadThread setUiHandler(final Handler handler) {
uiHandler = handler;
return this;
}
@Override
public boolean handleMessage(Message msg) {
if (msg == null || msg.getData() == null) {
return false;
}
String path = (String) msg.getData().get(KEY_URL);
Message startMsg = uiHandler.obtainMessage(TYPE_START, "开始下载 @" + System.currentTimeMillis() + " url==" + path);
uiHandler.sendMessage(startMsg);
SystemClock.sleep(3000);
Message finishMsg = uiHandler.obtainMessage(TYPE_FINISHED, "完成下载 @" + System.currentTimeMillis() + " url==" + path);
uiHandler.sendMessage(finishMsg);
return true;
}
@Override
public boolean quitSafely() {
uiHandler = null;
return super.quitSafely();
}
}
///////MyHandlerThread.java
public class MyHandlerThread extends Thread implements Handler.Callback {
private Handler handler;
private final String KEY_URL = "url";
public static final int TYPE_START = 1;
public static final int TYPE_FINISHED = 2;
private Handler workerHandler;
private List urlLists;
public MyHandlerThread(String name) {
super(name);
}
@Override
public void run() {
super.run();
Looper.prepare();//@1111
workerHandler = new Handler(this);
for (String url : urlLists) {
Message message = workerHandler.obtainMessage();
Bundle bundle = new Bundle();
bundle.putString(KEY_URL, url);
message.setData(bundle);
workerHandler.sendMessage(message);
}
Looper.loop();//@2222
}
public void setUrlLists(String... urls) {
urlLists = Arrays.asList(urls);
}
public Handler getUIHandler() {
return handler;
}
public MyHandlerThread setUiHandler(final Handler handler) {
this.handler = handler;
return this;
}
@Override
public boolean handleMessage(Message msg) {
//处理相关消息；
if (msg == null || msg.getData() == null) {
return false;
}
String path = (String) msg.getData().get(KEY_URL);
Message startMsg = handler.obtainMessage(TYPE_START, "开始下载 @" + System.currentTimeMillis() + " url==" + path);
handler.sendMessage(startMsg);
SystemClock.sleep(3000);
Message finishMsg = handler.obtainMessage(TYPE_FINISHED, "完成下载 @" + System.currentTimeMillis() + " url==" + path);
handler.sendMessage(finishMsg);
return true;
}
}
很明显，再比对HandlerThread的源码可以发现，刨去安全性能问题，最大的区别就是我们自己使用Handler+Thread实现的时候需要注释中@1111和@2222两处的Looper.prepare()和Looper.loop()。O(∩_∩)O哈哈~