我是新手,也是Android编程新手。我在互联网网站上找到了这个例子(下面是例子),这是一个很棒的教程!我想要实现的是当我在GridView上单击一张图片时,我想要显示图像的完整大小。
public class MainActivity 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);
}
@Override
public int getCount() {
return itemList.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@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(220, 220));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} 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 void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gridview = (GridView) findViewById(R.id.gridview);
myImageAdapter = new ImageAdapter(this);
gridview.setAdapter(myImageAdapter);
String ExternalStorageDirectoryPath = Environment
.getExternalStorageDirectory().getAbsolutePath();
String targetPath = ExternalStorageDirectoryPath + "/test/";
Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG)
.show();
File targetDirector = new File(targetPath);
File[] files = targetDirector.listFiles();
for (File file : files) {
myImageAdapter.add(file.getAbsolutePath());
}
}
}
答案 0 :(得分:0)
将图像传递给其他活动,以全屏显示。
传递主活动中的图像。请使用以下代码:
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
ImageView img = ia.getView(position, v, parent);
img.buildDrawingCache();
Bitmap bmap = img.getDrawingCache();
Intent intent = new Intent(HelloGridView.this,
Imageviewer.class);
Bundle bundle = new Bundle();
//bundle.putParcelable("image", bmap);
String par=myimageadpter.getpath(position);
bundle.putParcelable("imagepath", par);
intent.putExtras(bundle);
startActivityForResult(intent, 0);
}
});
在其他活动中,使用此代码显示传递的图像:
Bundle bundle = this.getIntent().getExtras();
bmp=bundle.getParcelable("image");
ImageView img=(ImageView) findViewById(R.id.imageView1);
d =new BitmapDrawable(bmp);
img.setImageBitmap(bmp);
如果你传递路径。第二项活动如下:
Bundle bundle = this.getIntent().getExtras();
String s=bundle.getParcelable("imagepath");
Bitmap Imagefrompath = BitmapFactory.decodeFile(s);
ImageView img=(ImageView) findViewById(R.id.imageView1);
img.setImageBitmap(Imagefrompath );