炫酷-背景圖上下循環(huán)滾動(dòng)登錄頁，Android RecyclerView實(shí)現(xiàn)方法
某站的登錄頁背景不停循環(huán)滾動(dòng)，和街邊的廣告箱很像，感覺不錯(cuò)我也心動(dòng)了。決定高仿一下，參考了幾篇文章后就動(dòng)手了。
實(shí)現(xiàn)步驟：
1.效果圖展示
2.自定義實(shí)現(xiàn)滾動(dòng)效果RecyclerView
3.適配器Adapter實(shí)現(xiàn)
4.適配器布局文件
5.主程序調(diào)用過程
6.主布局文件
7.總結(jié)
1.效果圖展示
666.gif
2.自定義實(shí)現(xiàn)滾動(dòng)效果RecyclerView
AutoPollRecyclerView.java
public class AutoPollRecyclerView extends RecyclerView {
private static final long TIME_AUTO_POLL = 16;
AutoPollTask autoPollTask;
private boolean running; //標(biāo)示是否正在自動(dòng)輪詢
private boolean canRun;//標(biāo)示是否可以自動(dòng)輪詢,可在不需要的是否置false
public AutoPollRecyclerView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
autoPollTask = new AutoPollTask(this);
}
static class AutoPollTask implements Runnable {
private final WeakReference<AutoPollRecyclerView> mReference;
//使用弱引用持有外部類引用->防止內(nèi)存泄漏
public AutoPollTask(AutoPollRecyclerView reference) {
this.mReference = new WeakReference<AutoPollRecyclerView>(reference);
}
@Override
public void run() {
AutoPollRecyclerView recyclerView = mReference.get();
if (recyclerView != null && recyclerView.running && recyclerView.canRun) {
recyclerView.scrollBy(2, 2);
recyclerView.postDelayed(recyclerView.autoPollTask, recyclerView.TIME_AUTO_POLL);
}
}
}
//開啟:如果正在運(yùn)行,先停止->再開啟
public void start() {
if (running)
stop();
canRun = true;
running = true;
postDelayed(autoPollTask, TIME_AUTO_POLL);
}
public void stop() {
running = false;
removeCallbacks(autoPollTask);
}
@Override
public boolean onTouchEvent(MotionEvent e) {
switch (e.getAction()) {
case MotionEvent.ACTION_DOWN:
if (running)
stop();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_OUTSIDE:
if (canRun)
start();
break;
}
//return false，注釋掉onTouchEvent()方法里面的stop和start方法，則列表自動(dòng)滾動(dòng)且不可觸摸
return super.onTouchEvent(e);}
}
3.適配器Adapter實(shí)現(xiàn)
AutoPollAdapter.java
public class AutoPollAdapter extends RecyclerView.Adapter<AutoPollAdapter.BaseViewHolder> {
private final Context mContext;
public AutoPollAdapter(Context context) {
this.mContext = context;
}
@Override
public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.auto_list_item, parent, false);
BaseViewHolder holder = new BaseViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(BaseViewHolder holder, int position) {
}
@Override
public int getItemCount() {
return Integer.MAX_VALUE;
}
class BaseViewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
public BaseViewHolder(View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.iv_login_bg);
}
}
}
4.適配器布局文件
auto_list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/iv_login_bg"
android:layout_width="480dp"
android:layout_height="2065dp"
android:scaleType="matrix"
android:adjustViewBounds="true"
android:background="@drawable/login_bg01"/>
5.主程序調(diào)用過程
LoginActivity.java
public class LoginActivity extends AppCompatActivity {
private AutoPollRecyclerView recyclerView;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
recyclerView = findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(
new LinearLayoutManager(
this,
//設(shè)置LinearLayoutManager.HORIZONTAL 則水平滾動(dòng)
LinearLayoutManager.VERTICAL, false));
AutoPollAdapter autoPollAdapter = new AutoPollAdapter(getApplicationContext());
recyclerView.setAdapter(autoPollAdapter);
//啟動(dòng)滾動(dòng)
recyclerView.start();
}
}
6.主布局文件
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">
<com.imooc.guessmusic.view.AutoPollRecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:ignore="MissingConstraints" />
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@drawable/login_dark" />
<ImageView
android:layout_width="120dp"
android:layout_height="120dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="120dp"
android:src="@drawable/login_logo" />
<TextView
android:layout_width="400dp"
android:layout_height="60dp"
android:layout_marginTop="60dp"
android:layout_gravity="center"
android:background="@drawable/btn_c"
android:gravity="center"
android:textSize="22sp"
android:textStyle="bold"
android:textColor="@color/black"
android:text="微信登錄" />
<TextView
android:layout_width="400dp"
android:layout_height="60dp"
android:layout_marginTop="150dp"
android:layout_gravity="center"
android:background="@drawable/btn_c_b"
android:gravity="center"
android:textSize="22sp"
android:textColor="@color/text_white"
android:text="手機(jī)號(hào)碼快捷登錄" />
</FrameLayout>
7.總結(jié)
Demo里面使用了沉浸式效果，如何實(shí)現(xiàn)請(qǐng)參考下面的文章。
Android-沉浸式的實(shí)現(xiàn)
Demo里面使用了今日頭條適配方案能適配97%的手機(jī)，3%劉海屏與水滴屏未做適配，是如何實(shí)現(xiàn)請(qǐng)參考下面的文章。
今日頭條的屏幕適配方案，簡(jiǎn)易使用
核心代碼就是自定義的RecyclerView代碼，如果你想做其它效果的滾動(dòng)可以參考下面的文章。
Android實(shí)現(xiàn)類似中獎(jiǎng)信息自動(dòng)滾動(dòng)效果
Android RecyclerView打造自動(dòng)循環(huán)效果
原代碼獻(xiàn)上：https://pan.baidu.com/s/18sy-Gvjav8Dz2PwctrDcFw
提取碼：sr0i
