我是编程新手，我不知道如何从适配器启动相机意图并将图像保存到列表视图中每个项目的特定位置。我希望当我按下 takeImage 按钮时启动相机意图并将拍摄的图像保存到列表视图中每个项目的特定位置。我在 Planet 类中定义了一个属性
this.pathToSave = pathToSave
为了能够保存到特定位置，但我不知道如何将所有内容放在一起。
public class MyCustomAdaptor extends ArrayAdapter<Planet> {
private ArrayList<Planet> planetsArrayList;
Context context;
public MyCustomAdaptor(ArrayList<Planet> planetsArrayList,Context context){
super(context, R.layout.item_list_layout,planetsArrayList);
this.planetsArrayList = planetsArrayList;
this.context = context;
}
private static class MyViewHolder{
TextView planetName;
ImageView planetImg;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
Planet planets = getItem(position);
MyViewHolder myViewHolder;
final View result;
if(convertView == null) {
myViewHolder = new MyViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(
R.layout.item_list_layout,
parent,
false
);
myViewHolder.planetName = (TextView) convertView.findViewById(R.id.planet_name);
myViewHolder.planetImg = (ImageView) convertView.findViewById(R.id.imageView);
result = convertView;
convertView.setTag(myViewHolder);
}else{
myViewHolder = (MyViewHolder) convertView.getTag();
result = convertView;
}
myViewHolder.planetName.setText(planets.getPlanetName());
myViewHolder.planetImg.setImageResource(planets.getPlanetImage());
return result;
}
}
然后我有行星课：
public class Planet {
private String planetName;
private int planetImage;
private String pathToSave;
public Planet(String planetName, int planetImage, String pathToSave){
this.planetName = planetName;
this.planetImage = planetImage;
this.pathToSave = pathToSave;
}
public String getPlanetName() {
return planetName;
}
public int getPlanetImage() {
return planetImage;
}
public String getPathToSave() {
return pathToSave;
}
public void setPlanetName(String planetName) {
this.planetName = planetName;
}
public void setPlanetImage(int planetImage) {
this.planetImage = planetImage;
}
public void setPathToSave(String pathToSave) {
this.pathToSave = pathToSave;
}
}
然后我有列表视图：
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto">
<ImageView
android:id="@+id/imageView"
android:layout_width="110sp"
android:layout_height="110sp"
android:layout_margin="16sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.006"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/planet_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="16dp"
android:text="Planet Name"
android:textSize="24sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="@+id/imageView"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/takeImage"
android:layout_width="110sp"
android:layout_height="40sp"
android:layout_marginTop="108dp"
android:text="Scan Doc"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.465"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
我已经尝试了一切，但没有成功。
首先，在您的活动中您需要使用：
活动结果启动器
并将其传递给适配器：
public class Activity {
private ActivityResultLauncher<Intent> cameraLauncher;
MyCustomAdaptor adapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
setupCameraLauncher();
// This on onCreate or after retrieve the planetsArrayList data
adapter = new MyCustomAdaptor (planetsArrayList, context, cameraLauncher);
}
public void setupCameraLauncher() {
cameraLauncher = registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
result -> {
if (result.getResultCode() == Activity.RESULT_OK) {
Uri imageUri = adapterStructures.getCapturedImageUri();
String cameraUriString = imageUri.toString(); // Here is your LOCAL IMAGE
Planet planet = new Planet();
planet.setPlanetName("The Planet"); // Handle your value
planet.setPlanetImage(1); // Handle your value
planet.setPathToSave(cameraUriString );
planetsArrayList.add(planet);
adapter.notifyDataSetChanged();
}
)
}
}
您的适配器：
public class MyCustomAdaptor extends ArrayAdapter<Planet> {
private ArrayList<Planet> planetsArrayList;
Context context;
private final ActivityResultLauncher<Intent> cameraLauncher;
public MyCustomAdaptor(ArrayList<Planet> planetsArrayList,Context context, ActivityResultLauncher<Intent> cameraLauncher){
super(context, R.layout.item_list_layout,planetsArrayList);
this.planetsArrayList = planetsArrayList;
this.context = context;
this.cameraLauncher = cameraLauncher;
}
private static class MyViewHolder{
TextView planetName;
ImageView planetImg;
Button takeImage; // Add this
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
Planet planets = getItem(position);
MyViewHolder myViewHolder;
final View result;
if(convertView == null) {
myViewHolder = new MyViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(
R.layout.item_list_layout,
parent,
false
);
myViewHolder.planetName = (TextView) convertView.findViewById(R.id.planet_name);
myViewHolder.planetImg = (ImageView) convertView.findViewById(R.id.imageView);
myViewHolder.takeImage = (Button) convertView.findViewById(R.id.takeImage);
result = convertView;
convertView.setTag(myViewHolder);
}else{
myViewHolder = (MyViewHolder) convertView.getTag();
result = convertView;
}
myViewHolder.planetName.setText(planets.getPlanetName());
myViewHolder.planetImg.setImageResource(planets.getPlanetImage());
myViewHolder.takeImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
openCamera(); // THe method to open the camera
}
});
return result;
}
private void openCamera() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(context.getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException e) {
e.printStackTrace();
}
if (photoFile != null) {
// Get the URI where the image will be saved in the gallery
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, "My Photo");
values.put(MediaStore.Images.Media.DESCRIPTION, "From Camera");
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
capturedImageUri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", photoFile);
if (capturedImageUri != null) {
Log.d("openCamera", "Photo URI saved: " + capturedImageUri);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, capturedImageUri);
cameraLauncher.launch(takePictureIntent);
}
}
}
}
public Uri getCapturedImageUri() {
return capturedImageUri;
}
然后是创建独特图像的方法：
private File createImageFile() throws IOException {
Log.d("createImageFile", "Creating image file...");
currentPhotoPath = "";
// Create a unique image file name based on timestamp
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
//File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
File storageDir = equipmentInfo.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
// Create the directory if it doesn't exist
if (!storageDir.exists()) {
storageDir.mkdirs();
}
Log.d("createImageFile", "Storage directory: " + storageDir.getAbsolutePath());
// Create the image file with a unique name
File imageFile = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save the file path for use with the camera intent
currentPhotoPath = imageFile.getAbsolutePath();
Log.d("createImageFile", "Image file created: " + currentPhotoPath);
return imageFile;
}