在Android应用程序中...单击图像从相机使用按钮单击并在活动中的小区域动态显示所有单击的图像到水平滚动视图，而不是像画廊视图那样的整个活动，但不想在特定图像上使用图库和onlongpressed显示一个删除它的对话框。
答案 0 :(得分：1)
我已经开发出了解决方案..
MainActivity.java
package com.example.mtk.recyclerviewdemo;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.ContactsContract;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import static android.provider.MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE;
import static android.provider.MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO;
import static android.support.v4.app.ActivityCompat.startActivityForResult;
public class MainActivity extends AppCompatActivity {
static final int REQUEST_TAKE_PHOTO = 1;
private int SELECT_FILE = 2;
private static Button btnclick;
private String mCurrentPhotoPath;
private static RecyclerView recyclerView;
ArrayList<Data_Model> arrayList;
String chkpath = null;
MyAdapter m;
int i = 0;
private String userChoosenTask;
private Uri fileUri; // file url to store image/video
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnclick = (Button) findViewById(R.id.click);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
arrayList = new ArrayList<>();
m = new MyAdapter();
Log.d("oncreate", "set adapter");
recyclerView.setAdapter(m);
ViewGroup.LayoutParams params = recyclerView.getLayoutParams();
params.height = 200;
recyclerView.setLayoutParams(params);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(linearLayoutManager);
//Camera Click image
btnclick.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
selectImage();
}
});
}
public void takepicture() {
Log.d("Cameraclick", "takepicture");
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == REQUEST_TAKE_PHOTO) {
// Save Image To Gallery
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(mCurrentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
String clickpath = mCurrentPhotoPath;
Data_Model data_model = new Data_Model();
data_model.setImage(clickpath);
arrayList.add(data_model);
m.notifyDataSetChanged();
} else if (requestCode == SELECT_FILE) {
Log.d("gallery", "checkpointd");
onSelectFromGalleryResult(data);
}
}
}
class MyAdapter extends RecyclerView.Adapter<MyAdapter.Myviewholder> {
@Override
public Myviewholder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = getLayoutInflater().inflate(R.layout.item_rowchk, parent, false);
Myviewholder myviewholder = new Myviewholder(v);
Log.d("myactivty ", "oncreateViewHolder");
return myviewholder;
}
@Override
public void onBindViewHolder(Myviewholder holder, final int position) {
final Data_Model m = arrayList.get(position);
Log.d(" myactivty", "onBindviewholder" + position);
//holder.imageView.setVisibility(View.VISIBLE);
// bimatp factory
BitmapFactory.Options options = new BitmapFactory.Options();
// downsizing image as it throws OutOfMemory Exception for larger
// images
options.inSampleSize = 20;
final Bitmap bitmap = BitmapFactory.decodeFile(m.getImage(), options);
holder.imageView.setImageBitmap(bitmap);
holder.imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), ImageDisplay.class);
String chkpath = m.getImage();
intent.putExtra("path", chkpath);
Log.d("intent", "new activity");
startActivity(intent);
}
});
holder.imageView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
final int pst = position;
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case DialogInterface.BUTTON_POSITIVE:
arrayList.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, arrayList.size());
// Yes button clicked
Toast.makeText(MainActivity.this, "Yes Clicked",
Toast.LENGTH_LONG).show();
break;
case DialogInterface.BUTTON_NEGATIVE:
// No button clicked
// do nothing
Toast.makeText(MainActivity.this, "No Clicked",
Toast.LENGTH_LONG).show();
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage("Are you sure want to Delete ?")
.setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
return true;
}
});
}
@Override
public int getItemCount() {
return arrayList.size();
}
public class Myviewholder extends RecyclerView.ViewHolder {
public ImageView imageView;
public Myviewholder(View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.image);
}
}
}
private void onSelectFromGalleryResult(Intent data) {
Uri selectedImageUri = data.getData();
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery(selectedImageUri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String path = cursor.getString(column_index);
Data_Model data_model = new Data_Model();
data_model.setImage(path);
arrayList.add(data_model);
m.notifyDataSetChanged();
// Toast.makeText(this, "" + path, Toast.LENGTH_LONG).show();
}
private void selectImage() {
final CharSequence[] items = {"Take Photo", "Choose from Library",
"Cancel"};
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Add Photo!");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
boolean result = Utility.checkPermission(MainActivity.this);
if (items[item].equals("Take Photo")) {
userChoosenTask = "Take Photo";
if (result)
takepicture();
} else if (items[item].equals("Choose from Library")) {
userChoosenTask = "Choose from Library";
if (result)
galleryIntent();
} else if (items[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
public void galleryIntent() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
Log.d("gallery", "checkpointA");
startActivityForResult(Intent.createChooser(intent, "Select File"), SELECT_FILE);
Log.d("gallery", "checkpointB");
}
}
Data_Model.Java
package com.example.mtk.recyclerviewdemo;
import android.net.Uri;
public class Data_Model {
private String image;
// Getter and Setter model for recycler view items
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
}
ImageDisplay.java
package com.example.mtk.recyclerviewdemo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
public class ImageDisplay extends AppCompatActivity {
ImageView imageView;
private String path;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_display);
imageView = (ImageView) findViewById(R.id.imageviewnew);
//setupActionBar();
// Get Image Path
path = getIntent().getExtras().getString("path");
// Get Image
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions. inJustDecodeBounds = false;
bmOptions. inSampleSize = 4;
bmOptions. inPurgeable = true ;
Bitmap bitmap = BitmapFactory.decodeFile(path, bmOptions);
// Display Image
imageView.setImageBitmap(bitmap);
}
}
xml.files
activity_image_display.xml
activity_main.xml
item_row.xml
item_rowchk.xml
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.mtk.recyclerviewdemo.MainActivity"
android:weightSum="1">
<Button
android:id="@+id/click"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="10dp"
android:text="CLICK"
android:background="#fabdca"
android:textSize="27sp" />
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="20dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BUTTON CHECK"/>
</LinearLayout>
item_rowchk.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/image"
android:rotation="90"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Imagedisplay.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_image_display"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.mtk.recyclerviewdemo.ImageDisplay">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:rotation="90"
android:id="@+id/imageviewnew" />
</LinearLayout>