问题
I am trying to select image from gallery and trying to display it in gridview but it is not setting in gridview,following is my snippet code,can anyone tell me what is the issue with my code? Thanks in advance
public class MainActivity extends Activity {
private static int RESULT_LOAD_IMAGE = 1;
private ImageView imageView;
private Uri selectedImage;
private int columnIndex;
private GridView gridView;
private String picturePath;
private ImageView imageView11;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadPicture);
gridView = (GridView) findViewById(R.id.gridview);
gridView.setAdapter(new ImageAdapter(this));
gridView.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent,
View v, int position, long id)
{
Toast.makeText(getBaseContext(),
"pic" + (position + 1) + " selected",
Toast.LENGTH_SHORT).show();
}
});
buttonLoadImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
startActivityForResult(intent, 1);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
imageView = (ImageView) findViewById(R.id.imgView);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
objImageAdapter.addToList(picturePath);
cursor.close();
}
}
public class ImageAdapter extends BaseAdapter
{
private Context context;
ArrayList<String> arrayList;
public ImageAdapter(Context c)
{
context = c;
}
//---returns the number of images---
public int getCount() {
return arrayList.size();
}
//---returns the ID of an item---
public Object getItem(int position) {
return position;
}
void addToList(String strPath)
{
this.arrayList.add(strPath);
this.notifyDataSetChanged();
}
public long getItemId(int position) {
return position;
}
//In this array you have to store all images path which is you want to display in baseapater and must be global to access in baseapater
public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(185, 185));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(5, 5, 5, 5);
} else {
imageView = (ImageView) convertView;
}
String path = arrayList.get(position);
Bitmap myBitmap = BitmapFactory.decodeFile(path);
imageView.setImageBitmap(myBitmap);
return imageView;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<GridView
android:id="@+id/gridview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:columnWidth="90dp"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>
<ImageView
android:id="@+id/imgView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"></ImageView>
<Button
android:id="@+id/buttonLoadPicture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:text="Load Picture"
android:layout_gravity="center"></Button>
</LinearLayout>
回答1:
I am trying to select image from gallery and trying to display it in gridview but it is not setting in gridview
Do following Changes in ImageAdapter class :
1. Return size of arrayList from getCount method:
public int getCount() {
return arrayList.size();
}
2. Create a method for adding new selected image in current adapter data-source :
void addToList(String strPath)
{
this.arrayList.add(strPath);
this.notifyDataSetChanged();
}
Now in onActivityResult call addToList method to show selected image in GridView:
columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
objImageAdapter.addToList(picturePath);
cursor.close();
回答2:
How did you set position in imageView.setImageResource(), in SetImageResource if you set Gridview cell position than it's can't display image because it's in position variable only cell index are store like 0,1,2. You need to set your bitmap or Resource ID incest of "positon" in your Baseadapter getView method.
回答3:
First you store all your Gallery images path in global arrayList and than give to getView method position to your array and get single path for particular adapter cell after that just do it like belove code
ArrayList<String> arrayList; //In this array you have to store all images path which is you want to display in baseapater and must be global to access in baseapater
public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(185, 185));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(5, 5, 5, 5);
} else {
imageView = (ImageView) convertView;
}
String path = arrayList.get(position);
Bitmap myBitmap = BitmapFactory.decodeFile(path);
imageView.setImageBitmap(myBitmap);
return imageView;
}
来源：https://stackoverflow.com/questions/29713778/after-selection-of-image-from-gallery-is-not-set-in-gridview