大家好我正在尝试从网址加载图片并在加载后我正在尝试重新缩放它以使其适合整个屏幕，之后文本和按钮存在在图像下方可用使用滚动视图
这是我的片段
public class FirstFragment extends Fragment {
ImageView im;
Bitmap bitmap;
Drawable dr;
Bitmap bitap;
Bitmap newBitmap;
RelativeLayout rel;
View v;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
v = inflater.inflate(R.layout.first_frag, container, false);
rel = (RelativeLayout) v.findViewById(R.id.relativla);
rel.setVisibility(View.INVISIBLE);
new LoadImage().execute("http://opinions.esy.es/bg.jpg");
Button b = (Button) v.findViewById(R.id.navi);
im = (ImageView) v.findViewById(R.id.imageView);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getContext(), Navi.class);
startActivity(i);
}
});
return v;
}
public static FirstFragment newInstance(String text) {
FirstFragment f = new FirstFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
private class LoadImage extends AsyncTask<String, String, Bitmap> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
protected Bitmap doInBackground(String... args) {
try {
bitmap = BitmapFactory.decodeStream((InputStream) new URL(args[0]).getContent());
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}
protected void onPostExecute(Bitmap image) {
if(image != null){
dr = new BitmapDrawable(getResources(),image);
bitap = ((BitmapDrawable) dr).getBitmap();
float scalingFactor = getBitmapScalingFactor(bitap);
Bitmap newBitmap = Util.ScaleBitmap(bitmap, scalingFactor);
im.setImageBitmap(newBitmap);
}else{
Toast.makeText(getContext(), "Image Does Not exist or Network Error", Toast.LENGTH_SHORT).show();
}
}
}
private float getBitmapScalingFactor(Bitmap bm) {
Toast.makeText(getContext(),"entered here",Toast.LENGTH_LONG).show();
// Get display width from device
int displayWidth = getActivity().getWindowManager().getDefaultDisplay().getWidth();
// Get margin to use it for calculating to max width of the ImageView
RelativeLayout.LayoutParams layoutParams =
(RelativeLayout.LayoutParams)this.im.getLayoutParams();
int leftMargin = layoutParams.leftMargin;
int rightMargin = layoutParams.rightMargin;
// Calculate the max width of the imageView
int imageViewWidth = displayWidth - (leftMargin + rightMargin);
rel.setVisibility(View.VISIBLE);
// Calculate scaling factor and return it
return ( (float) imageViewWidth / (float) bm.getWidth() );
}
}
我的Util类
public class Util {
public static Bitmap ScaleBitmap(Bitmap bm, float scalingFactor) {
int scaleHeight = (int) (bm.getHeight() * scalingFactor);
int scaleWidth = (int) (bm.getWidth() * scalingFactor);
return Bitmap.createScaledBitmap(bm, scaleWidth, scaleHeight, true);
}
}
XML文件
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/scrollView"
android:fillViewport="true"
>
<RelativeLayout
android:id="@+id/relativla"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<Button
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@drawable/hamburger"
android:id="@+id/navi"
android:padding="10dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:id="@+id/imageView"
android:scaleType="fitCenter"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Diet Plans"
android:padding="10dp"
android:layout_marginTop="10dp"
android:textColor="@android:color/black"
android:textSize="25sp"
android:id="@+id/textView5"
android:layout_below="@+id/imageView"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/descrpitiondietplan"
android:textColor="#000000"
android:gravity="center"
android:layout_gravity="center_vertical"
android:textSize="15sp"
android:padding="10dp"
android:id="@+id/textView6"
android:layout_below="@+id/textView5"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Our Diet Plans"
android:textColor="@android:color/black"
android:padding="10dp"
android:textSize="25sp"
android:id="@+id/textView7"
android:layout_below="@+id/textView6"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/textView7"
android:layout_centerHorizontal="true"
android:padding="10dp">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Basic Diet Plan"
android:textColor="@android:color/white"
android:id="@+id/normmal"
android:background="@color/btn_login"
android:layout_marginBottom="10dp"
android:layout_gravity="center_horizontal" />
</LinearLayout>
</RelativeLayout>
</ScrollView>
在查看相对布局后调用getBitmapScaling因子的吐司内幕
希望你们能帮助我解决我的问题
答案 0 :(得分：0)
尝试添加这些
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics dm = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(dm);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(dm.widthPixels, dm.heightPixels);
im.setLayoutParams(params);
在im.setImageBitmap（newBitmap）下面; onPostExecute