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Pre-load data for android Activity/Fragment/View (android页面启动速度优化利器:在页面打开之前就预加载数据)

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busyhai/PreLoader

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PreLoader: Make your activity launch faster

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Pre-load data before Activity opens, and display data on UI after UI initialization. Speedup Activity launch

You can start a PreLoader everywhere and start to listen data which loaded by the PreLoader with preLoaderId

  • if DataLoader.loadData() is not completed, then DataListener.onDataArrived() will be called after the data load is completed

  • if DataLoader.loadData() is completed, then DataListener.onDataArrived() called immediately

Continuous optimization, welcome watch, star!

demo

demo download

Typically used for

  1. Pre-load data in Application.onCreate for HomePageActivity to reduce the user waiting time in HomePageActivity initialization

  2. Pre-load data before context.startActivity(), and display data after activity UI are initialized

  3. Pre-load data for complex UI Activity (UI initialization cost too much time)

  4. Pre-load data for next page of ListView/RecyclerView before pull to load more

Features

  • support network data, network images, local images, database queries, and file I/O

  • support for cross-activity pre-loading

  • support pull-down refresh (DataLoader reloads once, after loading completes, callback for all DataListener)

  • supports custom thread-pool

  • support one loader (DataLoader) for multiple listeners (DataListener)

  • support multiple preload tasks for an Activity

  • support for add/remove listener dynamically

image

Usage

  1. add dependencies in build.gradle
dependencies {
 compile 'com.billy.android:pre-loader:x.x.x'
}
  1. start a pre-load
int preLoaderId = PreLoader.preLoad(new Loader());
Intent intent = new Intent(this, PreLoadBeforeLaunchActivity.class);
intent.putExtra("preLoaderId", preLoaderId);
startActivity(intent);
//DataLoader, mock as load data from network
class Loader implements DataLoader<String> {
 @Override
 public String loadData() {
 //this method runs in thread pool
 // load data in this method synchronously
 try {
 Thread.sleep(600);
 } catch (InterruptedException ignored) {
 }
 return "data from network server";
 }
}
  1. Listen data after UI initialization in Activity/Fragment/View
PreLoader.listenData(preLoaderId, new Listener());
//after data load completed,DataListener.onDataArrived(...) will be called to process data
class Listener implements DataListener<String> {
 @Override
 public void onDataArrived(String data) {
 // this method runs on main thread, Handler is not required
 Toast.makeText(activity, data, Toast.LENGTH_SHORT).show();
 }
}
  1. Refresh data: DataLoader.loadData() will be called, and DataListener.onDataArrived() will be called for all listeners
PreLoader.refresh(preLoaderId);
  1. Destroy the PreLoader object if you do not need it(eg. Activity is destroyed)
PreLoader.destroy(preLoaderId);
  1. start a group of pre-load task with GroupedDataLoader and GroupedDataListener
//start pre-load task with a group of GroupedDataLoader(s)
int preLoaderId = PreLoader.preLoad(new Loader1(), new Loader2());
Intent intent = new Intent(this, PreLoadGroupBeforeLaunchActivity.class);
intent.putExtra("preLoaderId", preLoaderId);
startActivity(intent);
class Loader1 implements GroupedDataLoader<String> {
 @Override
 public String loadData() {
 TimeWatcher timeWatcher = TimeWatcher.obtainAndStart("GroupedDataLoader1 load data");
 try {
 Thread.sleep(600);
 } catch (InterruptedException ignored) {
 }
 return timeWatcher.stopAndPrint();
 }
 @Override
 public String keyInGroup() {
 return "loader1";
 }
}
class Loader2 implements GroupedDataLoader<String> {
 @Override
 public String loadData() {
 TimeWatcher timeWatcher = TimeWatcher.obtainAndStart("GroupedDataLoader2 load data");
 try {
 Thread.sleep(400);
 } catch (InterruptedException ignored) {
 }
 return timeWatcher.stopAndPrint();
 }
 @Override
 public String keyInGroup() {
 return "loader2";
 }
}
//listen data in Activity after UI initialization with GroupedDataListener(s) for each GroupedDataLoader(s)
//GroupedDataListener matched with GroupedDataLoader by key
PreLoader.listenData(preLoaderId
 , new DataHolder1()
 , new DataHolder2()
);
class DataHolder1 implements GroupedDataListener<String> {
 @Override
 public void onDataArrived(String data) {
 String s = allTime.stopAndPrint();
 logTextView.append(data + "\n" + s + "\n");
 }
 @Override
 public String keyInGroup() {
 return "loader1";
 }
}
class DataHolder2 implements GroupedDataListener<String> {
 @Override
 public void onDataArrived(String data) {
 String s = allTime.stopAndPrint();
 logTextView.append(data + "\n" + s + "\n");
 }
 @Override
 public String keyInGroup() {
 return "loader2";
 }
}

Better to use with the componentized architecture framework (CC)

CC framework comes with AOP at the component level: when component is calling for start an activity, you can start a pre-load for it. So, it is not need to do pre-load work in every place where you want to start the Activity.

  1. define a component for open the activity
public class ComponentA implements IComponent {
 @Override
 public String getName() {
 return "demo.ComponentA";
 }
 @Override
 public boolean onCall(CC cc) {
 int preLoaderId = PreLoader.preLoad(new Loader());
 Intent intent = new Intent(this, PreLoadBeforeLaunchActivity.class);
 intent.putExtra("preLoaderId", preLoaderId);
 startActivity(intent);
 CC.sendCCResult(cc.getCallId(), CCResult.success());
 return false;
 }
}

call that component by CC to open activity

// pre-load is needless here, the logistic of component are all inside that component itself
CC.obtainBuilder("demo.ComponentA").build().call();

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Pre-load data for android Activity/Fragment/View (android页面启动速度优化利器:在页面打开之前就预加载数据)

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