Android 显示全屏图像
我将图像存储在SD卡中,并将其显示在gridview中,现在我想在gridview上显示全屏图像。我不会在下一个屏幕上显示全屏图像。只显示空白屏幕Android 显示全屏图像,android,gridview,Android,Gridview,我将图像存储在SD卡中,并将其显示在gridview中,现在我想在gridview上显示全屏图像。我不会在下一个屏幕上显示全屏图像。只显示空白屏幕 public class MyMenu extends Activity{ public class ImageAdapter extends BaseAdapter { private Context mContext; ArrayList<String> itemList = new Arra
public class MyMenu extends Activity{
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);
}
public int getCount() {
return itemList.size();
}
public Object getItem(int arg0) {
return null;
}
public long getItemId(int position) {
return position;
}
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(90, 70));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 90, 70);
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;
private static final int CAMERA_REQUEST = 1888;
ImageButton camera,lib,baby,info;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.mymenu);
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
Intent i5=new Intent(getApplicationContext(),FullScreenSd.class);
i5.putExtra("id", position);
startActivity(i5);
}
});
myImageAdapter = new ImageAdapter(this);
gridview.setAdapter(myImageAdapter);
File folder = new File(Environment.getExternalStorageDirectory() + "/temp/");
if (folder.exists()) {
String ExternalStorageDirectoryPath = Environment
.getExternalStorageDirectory()
.getAbsolutePath();
String targetPath = ExternalStorageDirectoryPath + "/temp/";
File targetDirector = new File(targetPath);
File[] files = targetDirector.listFiles();
for (File file : files){
myImageAdapter.add(file.getAbsolutePath());
}
}
及
你到底在这里干什么?位置是它在gridview中的位置。你为什么把它当作id?你做的部分
i5.putExtra(“id”,位置)
是单击的元素的位置。这不是您需要的,您需要单击项目的剩余部分。假设您将resIds存储在某个数组中,您应该传递i5.putExtra(“id”,resIdArray[position])代码>此问题有四种解决方案,但前两种解决方案是合适的
1) 将位图转换为字节数组,然后传递到“活动”
将位图转换为字节数组:-
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
将字节数组传递到intent:-
Intent intent = new Intent(this, NextActivity.class);
intent.putExtra("picture", byteArray);
startActivity(intent);
从Bundle中获取字节数组并转换为位图图像:-
Bundle extras = getIntent().getExtras();
byte[] byteArray = extras.getByteArray("picture");
Bitmap bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setImageBitmap(bmp);
2) 首先将所选图像保存到内部或外部存储器中,然后将图像放入下一个活动并全屏显示
3) 将图像Url传递到下一个活动,然后在全屏活动中再次下载图像,然后在imageview中显示
4) 将位图传递到“活动”中。(但如果此时图像大小过大,则此解决方案不起作用)那么您的问题是什么?请明确说明您的问题。为什么要将位置设置为资源ID?我不知道在单击gridview项时如何显示全屏图像。我认为设置位置可能会起作用,这就是为什么我将位置设置为图像视图的原因。@user1758835请发布您的完整活动代码,所以我们可以帮助您更多。@user1758835请查看我的答案,如果您有任何问题,请告诉我,或者如果我的答案对您有帮助,请接受。
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
Intent intent = new Intent(this, NextActivity.class);
intent.putExtra("picture", byteArray);
startActivity(intent);
Bundle extras = getIntent().getExtras();
byte[] byteArray = extras.getByteArray("picture");
Bitmap bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setImageBitmap(bmp);