我是Android的新手,并且一直在使用一个教程,该教程从SD卡上的目录加载所有图像。我已经运行了教程,但是想在click监听器中添加一些代码,这将在gridview图像适配器中加载缩略图的完整版本。
public class PicturesFragment extends Fragment {
public class ImageAdapter extends BaseAdapter {
private Context mContext;
ArrayList<String> itemList = new ArrayList<String>();
public ImageAdapter(Context c) {
mContext = c;
}
void add(String path) {
itemList.add(path);
}
@Override
public int getCount() {
return itemList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return itemList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some
// attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(225, 225));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(1, 1, 1, 1);
} else {
imageView = (ImageView) convertView;
}
Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 220,
220);
imageView.setImageBitmap(bm);
return imageView;
}
public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth,
int reqHeight) {
Bitmap bm = null;
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth,
reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(path, options);
return bm;
}
public int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float) height
/ (float) reqHeight);
} else {
inSampleSize = Math.round((float) width / (float) reqWidth);
}
}
return inSampleSize;
}
}
ImageAdapter myImageAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.pictures_fragment, container, false);
GridView gridview = (GridView) rootView.findViewById(R.id.gridview);
myImageAdapter = new ImageAdapter(getActivity());
gridview.setAdapter(myImageAdapter);
String ExternalStorageDirectoryPath = Environment
.getExternalStorageDirectory().getAbsolutePath();
String targetPath = ExternalStorageDirectoryPath + "/myfilepath/Images";
Toast.makeText(getActivity().getApplicationContext(), targetPath, Toast.LENGTH_LONG)
.show();
File targetDirector = new File(targetPath);
File[] files = targetDirector.listFiles();
for (File file : files) {
myImageAdapter.add(file.getAbsolutePath());
}
gridview.setOnItemClickListener(myOnItemClickListener);
Button camerabtn = (Button) rootView.findViewById(R.id.camerabtn);
camerabtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), CameraActivity.class);
startActivityForResult(intent, 0);
}
});
return rootView;
}
这里是点击监听器,我相信我应该实现代码来解决这个问题。我想我应该启动另一个活动(FullImageActivity.class),它只包含一个带有imageview的布局,并将已经点击的图像传递给这个新活动,但我几乎不知道如何去做这个
OnItemClickListener myOnItemClickListener = new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String prompt = (String) parent.getItemAtPosition(position);
Toast.makeText(getActivity().getApplicationContext(), prompt, Toast.LENGTH_LONG)
.show();
//Intent i = new Intent(getActivity().getApplicationContext(), FullImageActivity.class);
// startActivity(i);
}
};
}
非常感谢任何帮助。
答案 0 :(得分:0)
是的,像这样更改onItemClick ..
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String path = (String) myImageAdapter.getItem(position);
Intent intent = new Intent(this, FullImageActivity.class);
intent.putExtra("IMAGEPATH",path);
startActivity(intent);
}
在FullImageActivity中有一个布局来显示路径中的完整图像。 您可以在FullImageActivity onCreate()
中获取路径 public class FullImageActivity extends ActionBarActivity{
@Override
public void onCreate(Bundle bundle){
super.onCreate(bundle);
setContentView(R.layout.image_layout);
String path = getIntent().getStringExtra("IMAGEPATH");
// load the image from the path and set it to the imageview in layout
}
}