【发布时间】：2015-07-10 09:49:53
【问题描述】：
我正在尝试调整通过相机接收到的图像的大小，以适应 ImageView，该 ImageView 将成为 ListView 中项目的一部分。
所以，在我的 onActivityResult 中，我得到了图像...
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1 && resultCode == Activity.RESULT_OK) {
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/imageneslpi");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-" + n + ".jpg";
file = new File(myDir, fname);
try {
out = new FileOutputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
byte[] byteArray = stream.toByteArray();
lat=Double.longBitsToDouble(prefs.getLong("latitud", 0));
lon=Double.longBitsToDouble(prefs.getLong("longitud", 0));
try {
ExifInterface exif=new ExifInterface(file.getCanonicalPath());
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, convert(lat));
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, convert(lon));
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, latitudeRef(lat));
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, longitudeRef(lon));
exif.saveAttributes();
} catch (IOException e) {
e.printStackTrace();
}
arrayFotos.add(new BeanFotos("", imageBitmap, lat, lon));
adapter.notifyDataSetChanged();
}
}
我正在通过构造函数将照片添加到数组中，这是 bean：
public class BeanFotos {
private Bitmap foto;
private String expediente;
private Double longitud;
private Double latitud;
public BeanFotos(String expediente, Bitmap foto, Double latitud, Double longitud) {
this.expediente = expediente;
this.foto = foto;
this.latitud = latitud;
this.longitud = longitud;
}
public String getExpediente() {
return expediente;
}
public void setExpediente(String expediente) {
this.expediente = expediente;
}
public Bitmap getFoto() {
return foto;
}
public void setFoto(Bitmap foto) {
this.foto = foto;
}
public Double getLatitud() {
return latitud;
}
public void setLatitud(Double latitud) {
this.latitud = latitud;
}
public Double getLongitud() {
return longitud;
}
public void setLongitud(Double longitud) {
this.longitud = longitud;
}
}
这是适配器：
public class FotoAdapter extends BaseAdapter {
private ArrayList<BeanFotos> fotos;
private LayoutInflater inflater=null;
public FotoAdapter(Context c, ArrayList<BeanFotos> fotos){
this.fotos=fotos;
inflater=LayoutInflater.from(c);
}
@Override
public int getCount() {
return fotos.size();
}
@Override
public Object getItem(int position) {
return fotos.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
int bmWidth=fotos.get(position).getFoto().getWidth();
int bmHeight=fotos.get(position).getFoto().getHeight();
int ivWidth;
int ivHeigth;
int new_width;
int new_height;
convertView=inflater.inflate(R.layout.foto_layout, null);
TextView lat=(TextView)convertView.findViewById(R.id.textlat);
TextView lon=(TextView)convertView.findViewById(R.id.textlon);
ImageView foto=(ImageView)convertView.findViewById(R.id.foto);
ivWidth=foto.getWidth();
ivHeigth=foto.getHeight();
new_width=ivWidth;
new_height = (int) Math.floor((double) bmHeight *( (double) new_width / (double) bmWidth));
Bitmap newbitMap = Bitmap.createScaledBitmap(fotos.get(position).getFoto(), new_width, new_height, true);
lat.setText(fotos.get(position).getLatitud().toString());
lon.setText(fotos.get(position).getLongitud().toString());
//foto.setImageBitmap(fotos.get(position).getFoto().getDrawingCache());
foto.setImageBitmap(newbitMap);
}
return convertView;
}
}
适配器中使用的布局：
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="@string/lon"
android:id="@+id/textView5"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<ImageView
android:layout_width="80dp"
android:layout_height="80dp"
android:id="@+id/foto"
android:layout_alignParentTop="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="@string/lat"
android:id="@+id/textView6"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="@+id/textlon"
android:layout_alignBottom="@+id/foto"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="@+id/textlat"
android:layout_alignTop="@+id/textlon"
android:layout_alignParentEnd="true" />
这样，当我调整图像大小以适应 ImageView 时，getWidth() 和 getHeight() 返回 0，因此图像不会在 ListView 中绘制。
如何获取 ImageView 的宽度和高度，以便正确缩放图像以适应 ImageView？
谢谢。
【问题讨论】：
标签： android image android-listview android-adapter