android-priority-jobqueue开源项目
Priority Job Queue is an implementation of a Job Queue specifically written for Android to easily schedule jobs (tasks) that run in the background, improving UX and application stability.
项目地址：https://github.com/path/android-priority-jobqueue
下面通过一个Demo来演示一下如果使用它。
MainActivity 界面布局文件activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<Button
android:id="@+id/bt_request"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/http_request" />
<Button
android:id="@+id/bt_local"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/local_task" />
</LinearLayout>
TwitterApplication 是Application的一个子类，用来初始化JobManager，代码如下：
package com.example.android_patheventtest.app;
import android.app.Application;
import android.util.Log;
import com.path.android.jobqueue.JobManager;
import com.path.android.jobqueue.config.Configuration;
import com.path.android.jobqueue.log.CustomLogger;
public class TwitterApplication extends Application {
private static TwitterApplication instance;
private JobManager jobManager;
public TwitterApplication() {
instance = this;
}
@Override
public void onCreate() {
super.onCreate();
configureJobManager();
}
private void configureJobManager() {
Configuration configuration = new Configuration.Builder(this)
.customLogger(new CustomLogger() {
private static final String TAG = "JOBS";
@Override
public boolean isDebugEnabled() {
return true;
}
@Override
public void d(String text, Object... args) {
Log.d(TAG, String.format(text, args));
}
@Override
public void e(Throwable t, String text, Object... args) {
Log.e(TAG, String.format(text, args), t);
}
@Override
public void e(String text, Object... args) {
Log.e(TAG, String.format(text, args));
}
})
.minConsumerCount(1)//always keep at least one consumer alive
.maxConsumerCount(3)//up to 3 consumers at a time
.loadFactor(3)//3 jobs per consumer
.consumerKeepAlive(120)//wait 2 minute
.build();
jobManager = new JobManager(this, configuration);
}
public JobManager getJobManager() {
return jobManager;
}
public static TwitterApplication getInstance() {
return instance;
}
}
MainActivity 代码
package com.example.android_patheventtest;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import com.example.android_patheventtest.app.TwitterApplication;
import com.example.android_patheventtest.events.DeletedCityEvent;
import com.example.android_patheventtest.events.PostedCityEvent;
import com.example.android_patheventtest.events.PostingCityEvent;
import com.example.android_patheventtest.jobs.PostTweetJob;
import com.example.android_patheventtest.tasks.SimpleBackgroundTask;
import com.path.android.jobqueue.JobManager;
import de.greenrobot.event.EventBus;
public class MainActivity extends BaseActivity {
private static final String TAG = "MainActivity";
private JobManager jobManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
jobManager = TwitterApplication.getInstance().getJobManager();
findView();
EventBus.getDefault().register(this);
}
private void findView() {
Button bt_request = (Button) findViewById(R.id.bt_request);
Button bt_local = (Button) findViewById(R.id.bt_local);
bt_request.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
requestData();
}
});
bt_local.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
doLocalTask();
}
});
}
protected void doLocalTask() {
new SimpleBackgroundTask<String>(this) {
@Override
protected String onRun() {
Log.e(TAG, "SimpleBackgroundTask sleep 8s");
try {
Thread.sleep(8000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onSuccess(String result) {
// TODO Auto-generated method stub
Log.e(TAG, "SimpleBackgroundTask execute success");
}
}.execute();
}
protected void requestData() {
jobManager.addJobInBackground(1, new PostTweetJob("SKY"));
}
public void onEventMainThread(PostingCityEvent ignored) {
Log.i(TAG, "PostingCityEvent status="+ignored.getStatus());
}
public void onEventMainThread(PostedCityEvent ignored) {
Log.i(TAG, "PostedCityEvent status="+ignored.getStatus());
}
public void onEventMainThread(DeletedCityEvent ignored) {
Log.i(TAG, "DeletedCityEvent status="+ignored.getStatus());
}
@Override
protected void onDestroy() {
super.onDestroy();
try {
EventBus.getDefault().unregister(this);
} catch (Throwable t){
//this may crash if registration did not go through. just be safe
}
}
}
定义自己的BaseJob任务，代码如下：
package com.example.android_patheventtest.jobs;
import android.util.Log;
import com.example.android_patheventtest.events.DeletedCityEvent;
import com.example.android_patheventtest.events.PostedCityEvent;
import com.example.android_patheventtest.events.PostingCityEvent;
import com.path.android.jobqueue.BaseJob;
import de.greenrobot.event.EventBus;
public class PostTweetJob extends BaseJob {
private static final String TAG = "PostTweetJob";
private long localId;
private String text;
public PostTweetJob(String text) {
super(true, true, "post_tweet");//order of tweets matter, we don't want to send two in parallel
//use a negative id so that it cannot collide w/ twitter ids
//we have to set local id here so it gets serialized into job (to find tweet later on)
localId = -System.currentTimeMillis();
this.text = text;
}
@Override
public void onAdded() {
// TODO Auto-generated method stub
Log.e(TAG, "onAdded");
EventBus.getDefault().post(new PostingCityEvent("posting"));
}
@Override
public void onRun() throws Throwable {
// TODO Auto-generated method stub
Log.e(TAG, "onRun sleep 6s");
Thread.sleep(6000);
EventBus.getDefault().post(new PostedCityEvent("posted"));
}
@Override
protected void onCancel() {
// TODO Auto-generated method stub
Log.e(TAG, "onCancel");
EventBus.getDefault().post(new DeletedCityEvent("deleted"));
}
@Override
protected boolean shouldReRunOnThrowable(Throwable throwable) {
// TODO Auto-generated method stub
Log.e(TAG, "shouldReRunOnThrowable");
return false;
}
}
一下是自定义的3个Event事件对象：
package com.example.android_patheventtest.events;
public class PostingCityEvent {
private String status;
public PostingCityEvent(String status) {
this.status = status;
}
public String getStatus() {
return status;
}
}
package com.example.android_patheventtest.events;
public class PostedCityEvent {
private String status;
public PostedCityEvent(String status) {
this.status = status;
}
public String getStatus() {
return status;
}
}
package com.example.android_patheventtest.events;
public class DeletedCityEvent {
private String status;
public DeletedCityEvent(String status) {
this.status = status;
}
public String getStatus() {
return status;
}
}
最后是SimpleBackgroundTask 类
package com.example.android_patheventtest.tasks;
import android.app.Activity;
import android.os.AsyncTask;
import java.lang.ref.WeakReference;
abstract public class SimpleBackgroundTask<T> extends AsyncTask<Void, Void, T> {
WeakReference<Activity> weakActivity;
public SimpleBackgroundTask(Activity activity) {
weakActivity = new WeakReference<Activity>(activity);
}
@Override
protected final T doInBackground(Void... voids) {
return onRun();
}
private boolean canContinue() {
Activity activity = weakActivity.get();
return activity != null && activity.isFinishing() == false;
}
@Override
protected void onPostExecute(T t) {
if(canContinue()) {
onSuccess(t);
}
}
abstract protected T onRun();
abstract protected void onSuccess(T result);
}
目前了解的就这么多，如果你知道更多关于 priority jobqueue的使用方法，欢迎留言！