App启动页倒计时功能

转载请注明出处：http://www.cnblogs.com/cnwutianhao/p/6753418.html

示例代码采用 RxJava + RxLifecycle + Data-Binding 模式编写

示例图：

话不多说，实现方式如下：

1.导入依赖库

① RxJava: Reactive Extensions for the JVM

compile ‘io.reactivex:rxjava:1.2.9‘
compile ‘io.reactivex:rxandroid:1.2.1‘

② RxLifecycle

compile ‘com.trello:rxlifecycle:1.0‘
compile ‘com.trello:rxlifecycle-components:1.0‘

③ Data-Binding

dataBinding {
    enabled = true
}

2.代码编写(关键代码)

① 自定义接口View

public interface BaseView {

    <T> LifecycleTransformer<T> bindToLife();

}

② 创建一个Helper类，用来进行倒计时操作

public final class RxHelper {

    private RxHelper() {
        throw new AssertionError();
    }

    /**
     * 倒计时
     */
    public static Observable<Integer> countdown(int time) {
        if (time < 0) {
            time = 0;
        }
        final int countTime = time;

        return Observable.interval(0, 1, TimeUnit.SECONDS)
                .map(new Func1<Long, Integer>() {
                    @Override
                    public Integer call(Long increaseTime) {
                        return countTime - increaseTime.intValue();
                    }
                })
                .take(countTime + 1)
                .subscribeOn(Schedulers.io())
                .unsubscribeOn(Schedulers.io())
                .subscribeOn(AndroidSchedulers.mainThread())
                .observeOn(AndroidSchedulers.mainThread());
    }

}

③ 自定义方法：实现异步加载

private void init() {
    RxHelper.countdown(5)
            .compose(this.<Integer>bindToLife())
            .subscribe(new Subscriber<Integer>() {
                @Override
                public void onCompleted() {
                    doSkip();
                }

                @Override
                public void onError(Throwable e) {
                    doSkip();
                }

                @Override
                public void onNext(Integer integer) {
                    mBinding.sbSkip.setText("跳过 " + integer);
                }
            });
}

④ 自定义方法：实现跳转

private void doSkip() {
    if (!mIsSkip) {
        mIsSkip = true;
        finish();
        startActivity(new Intent(SplashActivity.this, MainActivity.class));
        overridePendingTransition(R.anim.hold, R.anim.zoom_in_exit);
    }
}

⑤ 设置主题样式为全屏

<style name="SplashTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:windowFullscreen">true</item>
</style>

示例Demo下载：App启动页倒计时功能

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