java - 单击图像滑块并转到 Android Studio 中的另一个活动
问题描述
我是 Android Studio 的初学者,我希望图像是可点击的,这样我就可以跳转到另一个活动,您可以在其中找到有关您点击的图像的信息。我怎样才能做到这一点?有什么解决办法吗?
我正在考虑使用 onClickAttribute 但我不知道该怎么做。
这是activity_main.xml
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/viewPagerImageSlider"
android:layout_width="415dp"
android:layout_height="413dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="150dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="168dp"
android:paddingStart="80dp"
android:paddingEnd="80dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
这是 MainActivity.java
public class MainActivity extends AppCompatActivity {
private ViewPager2 viewPager2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager2 = findViewById(R.id.viewPagerImageSlider);
List<SliderItem> sliderItems = new ArrayList<>();
sliderItems.add(new SliderItem(R.drawable.image1));
sliderItems.add(new SliderItem(R.drawable.image2));
sliderItems.add(new SliderItem(R.drawable.image3));
sliderItems.add(new SliderItem(R.drawable.image4));
sliderItems.add(new SliderItem(R.drawable.image5));
viewPager2.setAdapter(new SliderAdapter(sliderItems, viewPager2));
viewPager2.setClipToPadding(false);
viewPager2.setClipChildren(false);
viewPager2.setOffscreenPageLimit(3);
viewPager2.getChildAt(0).setOverScrollMode(RecyclerView.OVER_SCROLL_NEVER);
CompositePageTransformer compositePageTransformer = new CompositePageTransformer();
compositePageTransformer.addTransformer(new MarginPageTransformer(40));
compositePageTransformer.addTransformer(new ViewPager2.PageTransformer() {
@Override
public void transformPage(@NonNull View page, float position) {
float r = 1 - Math.abs(position);
page.setScaleY(0.85f + r * 0.15f);
}
});
viewPager2.setPageTransformer(compositePageTransformer);
}
}
这是 SliderItem.java
public class SliderItem {
private int image;
SliderItem(int image) {
this.image = image;
}
public int getImage() {
return image;
}
}
这是 SliderAdapter.java
public class SliderAdapter extends RecyclerView.Adapter<SliderAdapter.SliderViewHolder> {
private List<SliderItem> sliderItems;
private ViewPager2 viewPager2;
SliderAdapter(List<SliderItem> sliderItems, ViewPager2 viewPager2) {
this.sliderItems = sliderItems;
this.viewPager2 = viewPager2;
}
@NonNull
@Override
public SliderViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return new SliderViewHolder(
LayoutInflater.from(parent.getContext()).inflate(
R.layout.slide_item_container,
parent,
false
)
);
}
@Override
public void onBindViewHolder(@NonNull SliderViewHolder holder, int position) {
holder.setImage(sliderItems.get(position));
if(position == sliderItems.size() - 2) {
viewPager2.post(runnable);
}
}
@Override
public int getItemCount() {
return sliderItems.size();
}
class SliderViewHolder extends RecyclerView.ViewHolder {
private RoundedImageView imageView;
SliderViewHolder(@NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.imageSlide);
}
void setImage(SliderItem sliderItem) {
imageView.setImageResource(sliderItem.getImage());
}
}
private Runnable runnable = new Runnable() {
@Override
public void run() {
sliderItems.addAll(sliderItems);
notifyDataSetChanged();
}
};
}
这是 slide_item_container.xml
<?xml version="1.0" encoding="utf-8"?>
<com.makeramen.roundedimageview.RoundedImageView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/imageSlide"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
app:riv_corner_radius="12dp">
</com.makeramen.roundedimageview.RoundedImageView>
解决方案
我将尝试通过将图像位置从 MainActivity 传递给 detailActivity 来解释如何传递数据。
我使用以下方式:首先,使用方法名称创建一个接口,onPictureClicked()
然后在 MainActivity 中实现该接口以覆盖onPictureClicked()
。在您的适配器中调用此方法。像:interface.onPictureClicked(int picturePositon)
接口.java
public interface ClickedListener {
void onPictureClicked(int position);
}
SliderAdapter.java
public class SliderAdapter extends RecyclerView.Adapter<SliderAdapter.SliderViewHolder> {
private List<SliderItem> sliderItems;
private ViewPager2 viewPager2;
private ClickedListener clickedListener;
SliderAdapter(List<SliderItem> sliderItems, ViewPager2 viewPager2, ClickedListener clickedListener) {
this.sliderItems = sliderItems;
this.viewPager2 = viewPager2;
this.clickedListener = clickedListener;
}
@NonNull
@Override
public SliderViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return new SliderViewHolder(
LayoutInflater.from(parent.getContext()).inflate(
R.layout.slide_item_container,
parent,
false
)
);
}
@Override
public void onBindViewHolder(@NonNull SliderViewHolder holder, int position) {
holder.setImage(sliderItems.get(position));
if(position == sliderItems.size() - 2) {
viewPager2.post(runnable);
}
}
@Override
public int getItemCount() {
return sliderItems.size();
}
class SliderViewHolder extends RecyclerView.ViewHolder {
private RoundedImageView imageView;
SliderViewHolder(@NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.imageSlide);
}
void setImage(SliderItem sliderItem) {
imageView.setImageResource(sliderItem.getImage());
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
clickedListener.onPictureClicked(getAdapterPosition);
}
});
}
}
private Runnable runnable = new Runnable() {
@Override
public void run() {
sliderItems.addAll(sliderItems);
notifyDataSetChanged();
}
};
}
public class MainActivity extends AppCompatActivity implements ClickedListener{
private ViewPager2 viewPager2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager2 = findViewById(R.id.viewPagerImageSlider);
List<SliderItem> sliderItems = new ArrayList<>();
sliderItems.add(new SliderItem(R.drawable.image1));
sliderItems.add(new SliderItem(R.drawable.image2));
sliderItems.add(new SliderItem(R.drawable.image3));
sliderItems.add(new SliderItem(R.drawable.image4));
sliderItems.add(new SliderItem(R.drawable.image5));
viewPager2.setAdapter(new SliderAdapter(sliderItems, viewPager2, this));
viewPager2.setClipToPadding(false);
viewPager2.setClipChildren(false);
viewPager2.setOffscreenPageLimit(3);
viewPager2.getChildAt(0).setOverScrollMode(RecyclerView.OVER_SCROLL_NEVER);
CompositePageTransformer compositePageTransformer = new CompositePageTransformer();
compositePageTransformer.addTransformer(new MarginPageTransformer(40));
compositePageTransformer.addTransformer(new ViewPager2.PageTransformer() {
@Override
public void transformPage(@NonNull View page, float position) {
float r = 1 - Math.abs(position);
page.setScaleY(0.85f + r * 0.15f);
}
});
viewPager2.setPageTransformer(compositePageTransformer);
}
//on image clicked this method will be triggered.
@Override
public void onPictureClicked(int position) {
Intent intent = new Intent(getApplicationContext(), DetaildActivity.class);
intent.putExtra("key",position);
startActivity(intent);
}
}
创建这个detailedActivity
以获得意图MainActivity
public class MainActivity1 extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainpage);
//the image position will be passed from the mainActivity to this DetailedActivity
int getPosition = getIntent().getIntExtra("key", -1);
}
}
这只是通过接口演示如何在适配器中实现 onClick 以传输或启动另一个活动。
推荐阅读
- c# - 如何将一个窗口中的数据网格与另一个窗口中的文本框绑定?
- javascript - 将来自 React 上下文提供者的状态放入 const
- java - JPA Query 相当于查找关键字出现次数最多的前 10 个 SQL 查询
- javascript - Vanilla JS 想要在每次点击时创建一个新的进度条?
- python - 乌龟定义对我来说看起来不错,但不起作用
- angular - Ionic Live Reload - 需要很长时间并且不保存页面
- unity3d - 如何使用 Unity Shader Graph 遮罩纹理
- grails - 使用 BaseClass 和 tablePerHierarchy 的 Grails 多对多 false
- java - 对象的二分搜索返回什么?
- python-3.x - 如何在一次或多次调用中为多个变量重塑数据框,从宽到长?