如何解决JAVA:从Firestore在Android的图像滑块中显示数据
我想显示一个图像滑块以从URL中获取图像,为此,我正在使用this Library。,以及此库的github页面上给出的示例代码。我已经通过创建ImageUrls和Description数组添加了图像网址,但是现在我想从Firestore中获取这些图像网址。
如何修改以下代码,请帮助:
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getName();
FirebaseFirestore db = FirebaseFirestore.getInstance();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_main);
//GET DATA FROM FIRESTORE
db.collection("sliders")
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot> () {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
Log.d(TAG,document.getId() + " => " + document.getData());
}
} else {
Log.w(TAG,"Error getting documents.",task.getException());
}
}
});
List<SliderItem> mSliderItems = new ArrayList<> ();
mSliderItems.add(new SliderItem ("test1","https://images.pexels.com/photos/218983/pexels-photo-218983.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260"));
mSliderItems.add(new SliderItem ("test2","https://images.pexels.com/photos/747964/pexels-photo-747964.jpeg?auto=compress&cs=tinysrgb&h=750&w=1260"));
mSliderItems.add(new SliderItem ("test3","https://images.pexels.com/photos/929778/pexels-photo-929778.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260"));
mSliderItems.add(new SliderItem ("test4","https://images.pexels.com/photos/4676400/pexels-photo-4676400.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260"));
SliderView sliderView = findViewById(R.id.imageSlider);
SliderAdapterExample adapter = new SliderAdapterExample(this,mSliderItems);
sliderView.setSliderAdapter(adapter);
sliderView.setIndicatorAnimation(IndicatorAnimationType.WORM); //set indicator animation by using IndicatorAnimationType. :WORM or THIN_WORM or COLOR or DROP or FILL or NONE or SCALE or SCALE_DOWN or SLIDE and SWAP!!
sliderView.setSliderTransformAnimation(SliderAnimations.SIMPLETRANSFORMATION);
sliderView.setAutoCycleDirection(SliderView.AUTO_CYCLE_DIRECTION_BACK_AND_FORTH);
sliderView.setIndicatorSelectedColor(Color.WHITE);
sliderView.setIndicatorUnselectedColor(Color.GRAY);
sliderView.setScrollTimeInSec(4); //set scroll delay in seconds :
sliderView.startAutoCycle();
}
}
编辑:
我尝试了以下编辑,但显示上下文错误。
SliderAdapterExample adapter = new SliderAdapterExample(this,mSliderItemList);
在行上方
db.collection("sliders")
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot> () {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
List<SliderItem> mSliderItemList = new ArrayList<> ();
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
SliderItem slideritem = document.toObject(SliderItem.class);
mSliderItemList.add(slideritem);
Log.d(TAG,document.getId() + " => " + document.getData());
}
SliderView sliderView = findViewById(R.id.imageSlider);
SliderAdapterExample adapter = new SliderAdapterExample(this,mSliderItemList);
sliderView.setSliderAdapter(adapter);
sliderView.setIndicatorAnimation(IndicatorAnimationType.WORM); //set indicator animation by using IndicatorAnimationType. :WORM or THIN_WORM or COLOR or DROP or FILL or NONE or SCALE or SCALE_DOWN or SLIDE and SWAP!!
sliderView.setSliderTransformAnimation(SliderAnimations.SIMPLETRANSFORMATION);
sliderView.setAutoCycleDirection(SliderView.AUTO_CYCLE_DIRECTION_BACK_AND_FORTH);
sliderView.setIndicatorSelectedColor(Color.WHITE);
sliderView.setIndicatorUnselectedColor(Color.GRAY);
sliderView.setScrollTimeInSec(4); //set scroll delay in seconds :
sliderView.startAutoCycle();
} else {
Log.w(TAG,task.getException());
}
}
});
解决方法
如果您已将所有图像保存在 Firebase存储中,则可以直接从该文件夹中查询。通过这种方法,您无需将链接添加到您的Cloud Firestore中,从而减少了读取次数。
用于从存储中的文件夹查询。
- 在存储中创建一个文件夹并上传图像。
- 现在在项目中添加存储依赖项
- 为滑块库创建适配器和模型类
现在将以下代码添加到您想要的滑块位置。
FirebaseStorage ST_storage;
SliderView sliderView;
//Code for listing images from storage
sliderView.setAutoCycle(true);
sliderView.setScrollTimeInSec(3);
sliderView.startAutoCycle();
ST_storage = FirebaseStorage.getInstance().getReference("YOUR_FOLDER_NAME");
ST_storage.listAll()
.addOnSuccessListener(listResult -> {
for (StorageReference item : listResult.getItems()) {
item.getDownloadUrl().addOnCompleteListener(task -> {
safetyTips_items.add(new SafetyTips_Item(Objects.requireNonNull(task.getResult()).toString()));
safety_tips_adapter.notifyDataSetChanged();
});
}
});
safety_tips_adapter = new SafetyTips_adapter(safetyTips_items);
sliderView.setSliderAdapter(safety_tips_adapter);
使用此方法,您可以直接列出所有图像,而无需添加URL。
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