我想创建一个ViewPager，当用户点击相册中的照片时，他可以使用ViewPager在图像之间滚动。我需要一些帮助。任何答案都是apreciate，谢谢。这是我的代码：
我的照片以全屏显示的ViewImage类：
public class ViewImage extends Activity {
// Declare Variable
TextView text;
ImageView imageview;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from view_image.xml
setContentView(R.layout.view_image);
// Retrieve data from MainActivity on GridView item click
Intent i = getIntent();
// Get the position
int position = i.getExtras().getInt("position");
// Get String arrays FilePathStrings
String[] filepath = i.getStringArrayExtra("filepath");
// Get String arrays FileNameStrings
String[] filename = i.getStringArrayExtra("filename");
// Locate the TextView in view_image.xml
text = (TextView) findViewById(R.id.imagetext);
// Load the text into the TextView followed by the position
text.setText(filename[position]);
// Locate the ImageView in view_image.xml
imageview = (ImageView) findViewById(R.id.full_image_view);
// Decode the filepath with BitmapFactory followed by the position
Bitmap bmp = BitmapFactory.decodeFile(filepath[position]);
// Set the decoded bitmap into ImageView
imageview.setImageBitmap(bmp);
}
}
AlbumActivity类，在这里创建一个新专辑：
public class AlbumActivity extends Activity implements AppCompatCallback {
private AppCompatDelegate delegate1;
private final int REQUEST_CODE_CAMERA_IMAGE = 1000;
private final int REQUEST_CODE_EXTERNAL_IMAGE = 2000;
String nameAlbum;
// Declare variables
private String[] FilePathStrings;
private String[] FileNameStrings;
private File[] listFile;
GridView grid;
GridViewAdapter adapter;
File file;
boolean deleted;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
delegate1 = AppCompatDelegate.create(this, this);
//call the onCreate() of the AppCompatDelegate
delegate1.onCreate(savedInstanceState);
//use the delegate to inflate the layout
delegate1.setContentView(R.layout.album_activity);
Toolbar toolbar = (Toolbar) findViewById(R.id.mytoolbarr);
delegate1.setSupportActionBar(toolbar);
delegate1.setTitle("Your Pictures");
Button btnChoosePicture = (Button) findViewById(R.id.addimage);
Intent intent = getIntent();
nameAlbum = intent.getStringExtra("nameAlbum");
// Check for SD Card
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
Toast.makeText(this, "Error! No SDCARD Found!", Toast.LENGTH_LONG)
.show();
} else {
// Locate the image folder in your SD Card
file = new File(Environment.getExternalStorageDirectory()
+ File.separator + nameAlbum);
if (file.isDirectory()) {
listFile = file.listFiles();
// Create a String array for FilePathStrings
FilePathStrings = new String[listFile.length];
// Create a String array for FileNameStrings
FileNameStrings = new String[listFile.length];
for (int i = 0; i < listFile.length; i++) {
// Get the path of the image file
FilePathStrings[i] = listFile[i].getAbsolutePath();
// Get the name image file
FileNameStrings[i] = listFile[i].getName();
}
}
// Locate the GridView in gridview_main.xml
grid = (GridView) findViewById(R.id.gridview);
// Pass String arrays to LazyAdapter Class
adapter = new GridViewAdapter(this, FilePathStrings, FileNameStrings);
// Set the LazyAdapter to the GridView
grid.setAdapter(adapter);
// Capture gridview item click
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent i = new Intent(AlbumActivity.this, ViewImage.class);
// Pass String arrays FilePathStrings
i.putExtra("filepath", FilePathStrings);
// Pass String arrays FileNameStrings
i.putExtra("filename", FileNameStrings);
// Pass click position
i.putExtra("position", position);
startActivity(i);
}
});
grid.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, final View view, final int position, final long id) {
AlertDialog.Builder builder = new AlertDialog.Builder(AlbumActivity.this);
builder.setCancelable(true);
builder.setMessage("Are you sure you want to delete this picture ?");
builder.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
File filepath = Environment.getExternalStorageDirectory();
File dir5 = new File(filepath.getAbsolutePath()
+ nameAlbum+FileNameStrings[position]);
File file3 = new File(String.valueOf(dir5));
deleted = file3.delete();
adapter.notifyDataSetChanged();
finish();
startActivity(getIntent());
dialog.dismiss();
}
});
builder.setTitle("Delete Picture");
AlertDialog dialog = builder.create();
dialog.show();
return true;
}
});
}
//select picture from external storage
btnChoosePicture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// choose picture from gallery
Intent PhotoPickerIntent = new Intent(
Intent.ACTION_PICK);
File pictureDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
String pictureDirectoryPath = pictureDirectory.getPath();
Uri data = Uri.parse(pictureDirectoryPath);
PhotoPickerIntent.setDataAndType(data, "image/*");
startActivityForResult(PhotoPickerIntent,
REQUEST_CODE_EXTERNAL_IMAGE);
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_setting) {
return true;
}else if(id==android.R.id.home){
finish();
}
return super.onOptionsItemSelected(item);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
// get image from external storage
if(resultCode == RESULT_OK){
if (requestCode == REQUEST_CODE_EXTERNAL_IMAGE) {
Uri uri = data.getData();
InputStream inputStream;
try {
inputStream = getContentResolver().openInputStream(uri);
Bitmap image = BitmapFactory.decodeStream(inputStream);
ArrayList<Bitmap> bitmapArray = new ArrayList<Bitmap>();
bitmapArray.add(image);
OutputStream output;
// Find the SD Card path
File filepath = Environment.getExternalStorageDirectory();
int count2 =0;
String paranteze = "("+count2+")";
int count1 = new File("/mnt/sdcard" + nameAlbum).listFiles().length;
count1 = count1 + 1;
String nameImage = "Wallpaper_" +count1 +".jpg";
for(int j =0;j<listFile.length;j++){
FileNameStrings[j] = listFile[j].getName();
if(FileNameStrings[j].equals(nameImage)){
nameImage="Wallpaper_" +count1+paranteze +".jpg";
count2++;
}
}
count2++;
File dir = new File(filepath.getAbsolutePath()
+ nameAlbum);
// Retrieve the image from the res folder
// Create a name for the saved image
file = new File(dir, nameImage);
try {
inputStream = getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
output = new FileOutputStream(file);
// Compress into png format image from 0% - 100%
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, output);
output.flush();
output.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
Toast.makeText(this, "Error! No SDCARD Found!", Toast.LENGTH_LONG)
.show();
} else {
// Locate the image folder in your SD Card
file = new File(Environment.getExternalStorageDirectory()
+ File.separator + nameAlbum);
if (file.isDirectory()) {
listFile = file.listFiles();
// Create a String array for FilePathStrings
FilePathStrings = new String[listFile.length];
// Create a String array for FileNameStrings
FileNameStrings = new String[listFile.length];
for (int i = 0; i < listFile.length; i++) {
// Get the path of the image file
FilePathStrings[i] = listFile[i].getAbsolutePath();
// Get the name image file
FileNameStrings[i] = listFile[i].getName();
// Locate the GridView in gridview_main.xml
grid = (GridView) findViewById(R.id.gridview);
// Pass String arrays to LazyAdapter Class
adapter = new GridViewAdapter(this, FilePathStrings, FileNameStrings);
// Set the LazyAdapter to the GridView
grid.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
}
}
}
@Override
public void onSupportActionModeStarted(ActionMode mode) {
}
@Override
public void onSupportActionModeFinished(ActionMode mode) {
}
@Nullable
@Override
public ActionMode onWindowStartingSupportActionMode(ActionMode.Callback callback) {
return null;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_album_activity, menu);
return true;
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch (item.getItemId()){
case R.id.action_add:
// choose picture from gallery
Intent PhotoPickerIntent = new Intent(
Intent.ACTION_PICK);
File pictureDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
String pictureDirectoryPath = pictureDirectory.getPath();
Uri data = Uri.parse(pictureDirectoryPath);
PhotoPickerIntent.setDataAndType(data, "image/*");
startActivityForResult(PhotoPickerIntent,
REQUEST_CODE_EXTERNAL_IMAGE);
break;
case R.id.action_delete:
break;
}
return super.onMenuItemSelected(featureId, item);
}
}
当然还有我的GridViewAdapter类
public class GridViewAdapter extends BaseAdapter {
ImageView image;
// Declare variables
private Activity activity;
private String[] filepath;
private String[] filename;
private static LayoutInflater inflater = null;
public GridViewAdapter(Activity a, String[] fpath, String[] fname) {
activity = a;
filepath = fpath;
filename = fname;
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return filepath.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.gridview_item, null);
// Locate the TextView in gridview_item.xml
TextView text = (TextView) vi.findViewById(R.id.text);
// Locate the ImageView in gridview_item.xml
image = (ImageView) vi.findViewById(R.id.grid_image);
// Set file name to the TextView followed by the position
File file = new File(filepath[position]);
Picasso.with(activity).load(file).placeholder(R.drawable.rtrt).fit().centerCrop().into(image);
// Decode the filepath with BitmapFactory followed by the position
// Set the decoded bitmap into ImageView
// image.setImageBitmap(bmp);
return vi;
}
}