Bolts 介绍
Bolts 是一款底层类库集合, 在后台实现异步操作, 并提供接口反馈当前异步执行的程度 (可以通过接口实现UI进度更新),
最后反馈执行的结果给UI主线程, 与AsyncTask比较: (1)使用的是无大小限制的线程池; (2)任务可组合可级联,防止了代码耦合。
使用
dependencies {
compile 'com.parse.bolts:bolts-tasks:1.4.0'
compile 'com.parse.bolts:bolts-applinks:1.4.0'}
示例代码
/**
Gets a String asynchronously.
*/
public Task<String> getStringAsync() {
// Let's suppose getIntAsync() returns a Task<Integer>.
return getIntAsync().continueWith(
// This Continuation is a function which takes an Integer as input,
// and provides a String as output. It must take an Integer because
// that's what was returned from the prevIoUs Task.
new Continuation<Integer, String>() {
// The Task getIntAsync() returned is passed to "then" for convenience.
public String then(Task<Integer> task) throws Exception {
Integer number = task.getResult();
return String.format("%d", Locale.US, number);
}
}
);
}