我需要仅使用文件名而不是资源 ID 来显示图像。
ImageView imgView = new ImageView(this);
imgView.setBackgroundResource(R.drawable.img1);
我在可绘制文件夹中有图像 img1。我希望从文件中显示该图像。
我该怎么做？
【问题讨论】：
标签： android imageview android-imageview android-file
如果您的资源已经在资源文件夹中，为什么您需要使用路径设置图像，Labeeb 是正确的，
只有当您的图像存储在 SD 卡中时才需要这种路径。
并且尝试使用以下代码从存储在 SD 卡中的文件设置位图图像。
File imgFile = new File("/sdcard/Images/test_image.jpg");
if(imgFile.exists()){
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
ImageView myImage = (ImageView) findViewById(R.id.imageviewTest);
myImage.setImageBitmap(myBitmap);
}
并在清单文件中包含此权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
【讨论】：
BitmapFactory相关方法应该在bg线程中调用。毕加索会自动为您处理。
ImageView.setImageURI(Uri.fromFile(new File("/sdcard/cats.jpg")));
我觉得你可以用这个
Bitmap bmImg = BitmapFactory.decodeFile("path of your img1");
imageView.setImageBitmap(bmImg);
【讨论】：
你也可以使用：
File imgFile = new File(“filepath”);
if(imgFile.exists())
{
ImageView myImage = new ImageView(this);
myImage.setImageURI(Uri.fromFile(imgFile));
}
这将为您隐含位图解码。
【讨论】：
所有答案都已过时。最好将picasso 用于此类目的。它有很多功能，包括背景图像处理。
我有没有提到它超级好用：
Picasso.with(context).load(new File(...)).into(imageView);
【讨论】：
Picasso.get().load(new File(...)).into(imageView);
String path = Environment.getExternalStorageDirectory()+ "/Images/test.jpg";
File imgFile = new File(path);
if(imgFile.exists())
{
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
ImageView imageView=(ImageView)findViewById(R.id.imageView);
imageView.setImageBitmap(myBitmap);
}
【讨论】：
来自官网：http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
ImageView image = (ImageView) findViewById(R.id.imagePreview);
try {
image.setImageBitmap(decodeSampledBitmap(picFilename));
} catch (Exception e) {
e.printStackTrace();
}
方法如下：
private 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) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight
&& (halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
private Bitmap decodeSampledBitmap(String pathName,
int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(pathName, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(pathName, options);
}
//I added this to have a good approximation of the screen size:
private Bitmap decodeSampledBitmap(String pathName) {
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
return decodeSampledBitmap(pathName, width, height);
}
【讨论】：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
public class MyGallery extends Activity {
private GridView gridView;
private String _location;
private String newFolder = "/IslamicGif/";
private String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
private AdView mAdView;
private ArrayList<Bitmap> photo = new ArrayList<Bitmap>();
public static String[] imageFileList;
TextView gallerytxt;
public static ImageAdapter imageAdapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.mygallery);
/*if (MenuClass.mInterstitialAd.isLoaded()) {
MenuClass.mInterstitialAd.show();
}*/
gallerytxt = (TextView) findViewById(R.id.gallerytxt);
/*gallerytxt.setTextSize(20);
int[] color = {Color.YELLOW,Color.WHITE};
float[] position = {0, 1};
Shader.TileMode tile_mode0= Shader.TileMode.REPEAT; // or TileMode.REPEAT;
LinearGradient lin_grad0 = new LinearGradient(0, 0, 0, 200,color,position, tile_mode0);
Shader shader_gradient0 = lin_grad0;
gallerytxt.getPaint().setShader(shader_gradient0);*/
ImageButton btn_back = (ImageButton) findViewById(R.id.btn_back);
btn_back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
MyGallery.this.finish();
}
});
mAdView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder()
.build();
mAdView.loadAd(adRequest);
gridView = (GridView) findViewById(R.id.gridView);
new MyGalleryAsy().execute();
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int pos, long arg3) {
// TODO Auto-generated method stub
Intent intent = new Intent(MyGallery.this, ImageDetail.class);
intent.putExtra("ImgUrl", imageFileList[pos]);
//Toast.makeText(MyGallery.this,"image detail"+pos,Toast.LENGTH_LONG).show();
startActivity(intent);
}
});
}
protected void onStart() {
super.onStart();
if (ImageDetail.deleted) {
photo = new ArrayList<Bitmap>();
new MyGalleryAsy().execute();
ImageDetail.deleted = false;
}
}
public class MyGalleryAsy extends AsyncTask<Void, Void, Void> {
private ProgressDialog dialog;
Bitmap mBitmap;
@Override
protected void onPreExecute() {
dialog = ProgressDialog.show(MyGallery.this, "", "Loading ...", true);
dialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
readImage();
return null;
}
@Override
protected void onPostExecute(Void result) {
dialog.dismiss();
DisplayMetrics displayMatrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMatrics);
int screenWidth = displayMatrics.widthPixels / 3;
if (photo.size() > 0) {
imageAdapter = new ImageAdapter(MyGallery.this, screenWidth);
gridView.setAdapter(imageAdapter);
}
}
}
private void readImage() {
// TODO Auto-generated method stub
try {
if (isSdPresent()) {
_location = extStorageDirectory + newFolder;
} else
_location = getFilesDir() + newFolder;
File file1 = new File(_location);
if (file1.isDirectory()) { // sdCard == true
imageFileList = file1.list();
if (imageFileList != null) {
for (int i = 0; i < imageFileList.length; i++) {
try {
photo.add(BitmapFactory.decodeFile(_location + imageFileList[i].trim()));
} catch (Exception e) {
// TODO: handle exception
//Toast.makeText(getApplicationContext(), e.toString(),Toast.LENGTH_LONG).show();
}
}
}
}
} catch (Exception e) {
// TODO: handle exception
}
}
public static boolean isSdPresent() {
return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
}
public class ImageAdapter extends BaseAdapter {
private Context context;
private LayoutInflater layoutInflater;
private int width;
private int mGalleryItemBackground;
public ImageAdapter(Context c) {
context = c;
}
public ImageAdapter(Context c, int width) {
context = c;
this.width = width;
}
public int getCount() {
return photo.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = layoutInflater.inflate(R.layout.galleryadapter, null);
RelativeLayout layout = (RelativeLayout) v.findViewById(R.id.galleryLayout);
ImageView imageView = new ImageView(context);
layout.addView(imageView, new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, width));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
layout.setLayoutParams(new GridView.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, width));
imageView.setImageBitmap(photo.get(position));
return v;
}
public void updateItemList(ArrayList<Bitmap> newItemList) {
photo = newItemList;
notifyDataSetChanged();
}
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="@color/colorPrimary"
android:minHeight="?attr/actionBarSize">
<TextView
android:id="@+id/gallerytxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_gravity="center"
android:fontFamily="@string/font_fontFamily_medium"
android:text="My Gallery"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/black"
android:textStyle="bold" />
<ImageButton
android:id="@+id/btn_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginLeft="12dp"
android:background="@drawable/ic_arrow_back_black_24dp" />
</RelativeLayout>
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_gravity="center|bottom"
android:visibility="gone"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_id" />
<GridView
android:id="@+id/gridView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/adView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/relativeLayout"
android:horizontalSpacing="5dp"
android:numColumns="2"
android:smoothScrollbar="true"
android:verticalSpacing="5dp"></GridView>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:id="@+id/galleryLayout"
android:padding="2dp">
public class ImageDetail extends Activity implements OnClickListener {
public static InterstitialAd mInterstitialAd;
private ImageView mainImageView;
private LinearLayout menuTop;
private TableLayout menuBottom;
private Boolean onOff = true;
private ImageView delButton, mailButton, shareButton;
private String imgUrl = null;
private AdView mAdView;
TextView titletxt;
private String newFolder = "/IslamicGif/";
private String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
public static boolean deleted = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.image_detail);
mAdView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder()
.build();
mAdView.loadAd(adRequest);
mAdView.setAdListener(new AdListener() {
@Override
public void onAdLoaded() {
mAdView.setVisibility(View.VISIBLE);
}
});
mainImageView = (ImageView) findViewById(R.id.mainImageView);
menuTop = (LinearLayout) findViewById(R.id.menuTop);
menuBottom = (TableLayout) findViewById(R.id.menuBottom);
titletxt = (TextView) findViewById(R.id.titletxt);
titletxt.setTextSize(22);
mInterstitialAd = new InterstitialAd(this);
mInterstitialAd.setAdUnitId(getString(R.string.interstial_id));
mInterstitialAd.setAdListener(new AdListener() {
@Override
public void onAdClosed() {
requestNewInterstitial();
}
});
requestNewInterstitial();
delButton = (ImageView) findViewById(R.id.delButton);
mailButton = (ImageView) findViewById(R.id.mailButton);
shareButton = (ImageView) findViewById(R.id.shareButton);
Bundle exBundle = getIntent().getExtras();
if (exBundle != null) {
imgUrl = exBundle.getString("ImgUrl");
}
if (isSdPresent()) {
imgUrl = extStorageDirectory + newFolder + imgUrl;
} else
imgUrl = getFilesDir() + newFolder + imgUrl;
if (imgUrl != null) {
GlideDrawableImageViewTarget imageViewTarget = new GlideDrawableImageViewTarget(mainImageView);
Glide.with(this).load(imgUrl).into(imageViewTarget);
}
delButton.setOnClickListener(this);
mailButton.setOnClickListener(this);
shareButton.setOnClickListener(this);
}
public static boolean isSdPresent() {
return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch (arg0.getId()) {
case R.id.shareButton:
Image_Link();
break;
case R.id.delButton:
deleted();
break;
case R.id.mailButton:
sendemail();
break;
default:
break;
}
}
private void sendemail() {
try {
File photo = new File(imgUrl);
Uri imageuri = Uri.fromFile(photo);
String url = Constant.AppUrl;
SpannableStringBuilder builder = new SpannableStringBuilder();
builder.append("Face Placer App Available here..Play Link");
int start = builder.length();
builder.append(url);
int end = builder.length();
builder.setSpan(new URLSpan(url), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
Intent emailIntent2 = new Intent(Intent.ACTION_SEND);
String[] recipients2 = new String[]{"mymail@email.com", "",};
emailIntent2.putExtra(Intent.EXTRA_EMAIL, recipients2);
emailIntent2.putExtra(Intent.EXTRA_SUBJECT, "Sample mail");
emailIntent2.putExtra(Intent.EXTRA_STREAM, imageuri);
emailIntent2.putExtra(Intent.EXTRA_TEXT, builder);
emailIntent2.setType("text/html");
emailIntent2.setType("image/JPEG");
startActivity(Intent.createChooser(emailIntent2, "Send mail client :"));
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();
}
}
private void Image_Link() {
try {
File photo = new File(imgUrl);
Uri imageuri = Uri.fromFile(photo);
String url = Constant.AppUrl;
SpannableStringBuilder builder = new SpannableStringBuilder();
builder.append("Face Placer App Available here..Play Link");
int start = builder.length();
builder.append(url);
int end = builder.length();
builder.setSpan(new URLSpan(url), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
Intent emailIntent2 = new Intent(Intent.ACTION_SEND);
String[] recipients2 = new String[]{"mymail@email.com", "",};
emailIntent2.putExtra(Intent.EXTRA_EMAIL, recipients2);
emailIntent2.putExtra(Intent.EXTRA_SUBJECT, "Sample mail");
emailIntent2.putExtra(Intent.EXTRA_STREAM, imageuri);
emailIntent2.putExtra(Intent.EXTRA_TEXT, builder);
emailIntent2.setType("text/html");
emailIntent2.putExtra(Intent.EXTRA_TEXT, "Face Placer App Available here..Play Link " + url);
emailIntent2.setType("image/JPEG");
startActivity(Intent.createChooser(emailIntent2, "Send mail client :"));
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();
}
}
private void deleted() {
if (mInterstitialAd.isLoaded()) {
mInterstitialAd.show();
}
AlertDialog.Builder builder = new AlertDialog.Builder(ImageDetail.this);
builder.setTitle(getString(R.string.removeoption));
builder.setMessage(getString(R.string.deleteimage));
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
dialog.cancel();
File fileDel = new File(imgUrl);
boolean isCheck1 = fileDel.delete();
if (isCheck1) {
deleted = true;
finish();
MyGallery.imageAdapter.notifyDataSetChanged();
} else {
Toast.makeText(getApplicationContext(), "error", Toast.LENGTH_LONG).show();
}
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
dialog.cancel();
}
});
Dialog dialog = builder.create();
dialog.show();
}
private boolean isNetworkConnected() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
if (ni == null) {
// There are no active networks.
return false;
} else
return true;
}
private void requestNewInterstitial() {
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice("SEE_YOUR_LOGCAT_TO_GET_YOUR_DEVICE_ID")
.build();
mInterstitialAd.loadAd(adRequest);
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg"
android:orientation="vertical">
<ImageView
android:id="@+id/mainImageView"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:contentDescription="@string/app_name"
android:focusable="true"
android:focusableInTouchMode="true" />
<LinearLayout
android:id="@+id/adlayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:orientation="horizontal"
android:visibility="gone"></LinearLayout>
<LinearLayout
android:id="@+id/menuTop"
android:layout_width="fill_parent"
android:layout_height="56dp"
android:layout_alignWithParentIfMissing="true"
android:layout_below="@+id/adlayout"
android:background="@color/colorPrimary"
android:orientation="vertical"
android:padding="10.0dip"
android:visibility="visible">
<TextView
android:id="@+id/titletxt"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="Islamic Gifs"
android:textColor="#000000"
android:textSize="22sp"
android:textStyle="bold" />
</LinearLayout>
<TableLayout
android:id="@+id/menuBottom"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="@color/colorPrimary"
android:padding="10.0dip"
android:stretchColumns="*"
android:visibility="visible">
<TableRow>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<ImageView
android:id="@+id/mailButton"
android:layout_width="52dp"
android:layout_height="52dp"
android:background="@drawable/selector_shareimage"
android:contentDescription="@string/app_name" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<ImageView
android:id="@+id/shareButton"
android:layout_width="52dp"
android:layout_height="52dp"
android:background="@drawable/selector_shareimage_small"
android:contentDescription="@string/app_name" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<ImageView
android:id="@+id/delButton"
android:layout_width="52dp"
android:layout_height="52dp"
android:background="@drawable/selector_delete"
android:contentDescription="@string/app_name" />
</LinearLayout>
</TableRow>
</TableLayout>
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/menuTop"
android:layout_centerHorizontal="true"
android:visibility="gone"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_id"></com.google.android.gms.ads.AdView>
<?xml version="1.0" encoding="utf-8"?>
<item android:drawable="@drawable/result_bt_mail" android:state_enabled="true" android:state_pressed="true"/>
<item android:drawable="@drawable/result_bt_mail" android:state_enabled="true" android:state_focused="true"/>
<item android:drawable="@drawable/result_bt_mail" android:state_enabled="true" android:state_selected="true"/>
<item android:drawable="@drawable/result_bt_mail_s"/>
不要忘记为 sdk 版本 29 和 30 添加应用程序标签 以添加此行
android:requestLegacyExternalStorage="true"
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:requestLegacyExternalStorage="true"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
【讨论】：
你可以使用：
ImageView imgView = new ImageView(this);
InputStream is = getClass().getResourceAsStream("/drawable/" + fileName);
imgView.setImageDrawable(Drawable.createFromStream(is, ""));
【讨论】：
您可以使用它来访问特定文件夹并获取特定图像
public void Retrieve(String path, String Name)
{
File imageFile = new File(path+Name);
if(imageFile.exists()){
Bitmap myBitmap = BitmapFactory.decodeFile(path+Name);
myImage = (ImageView) findViewById(R.id.savedImage);
myImage.setImageBitmap(myBitmap);
Toast.makeText(SaveImage.this, myBitmap.toString(), Toast.LENGTH_LONG).show();
}
}
然后你可以调用它
Retrieve(Environment.getExternalStorageDirectory().toString()+"/Aqeel/Images/","Image2.PNG");
Toast.makeText(SaveImage.this, "Saved", Toast.LENGTH_LONG).show();
【讨论】：
public static Bitmap decodeFile(String path) {
Bitmap b = null;
File f = new File(path);
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream fis = null;
try {
fis = new FileInputStream(f);
BitmapFactory.decodeStream(fis, null, o);
fis.close();
int IMAGE_MAX_SIZE = 1024; // maximum dimension limit
int scale = 1;
if (o.outHeight > IMAGE_MAX_SIZE || o.outWidth > IMAGE_MAX_SIZE) {
scale = (int) Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE / (double) Math.max(o.outHeight, o.outWidth)) / Math.log(0.5)));
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
fis = new FileInputStream(f);
b = BitmapFactory.decodeStream(fis, null, o2);
fis.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return b;
}
public static Bitmap showBitmapFromFile(String file_path)
{
try {
File imgFile = new File(file_path);
if(imgFile.exists()){
Bitmap pic_Bitmap = decodeFile(file_path);
return pic_Bitmap;
}
} catch (Exception e) {
MyLog.e("Exception showBitmapFromFile");
return null;
}
return null;
}
如果您在列表视图中使用图像加载，请使用 Aquery 概念。
https://github.com/AshishPsaini/AqueryExample
AQuery aq= new AQuery((Activity) activity, convertView);
//load image from file, down sample to target width of 250 pixels .gi
File file=new File("//pic/path/here/aaaa.jpg");
if(aq!=null)
aq.id(holder.pic_imageview).image(file, 250);
【讨论】：
onLoadImage 满载
private void onLoadImage(final String imagePath) {
ImageSize targetSize = new ImageSize(imageView.getWidth(), imageView.getHeight()); // result Bitmap will be fit to this size
//ImageLoader imageLoader = ImageLoader.getInstance(); // Get singleto
com.nostra13.universalimageloader.core.ImageLoader imageLoader = com.nostra13.universalimageloader.core.ImageLoader.getInstance();
imageLoader.init(ImageLoaderConfiguration.createDefault(getContext()));
imageLoader.loadImage(imagePath, targetSize, new SimpleImageLoadingListener() {
@Override
public void onLoadingStarted(final String imageUri, View view) {
super.onLoadingStarted(imageUri, view);
progress2.setVisibility(View.VISIBLE);
new Handler().post(new Runnable() {
public void run() {
progress2.setColorSchemeResources(android.R.color.holo_green_light, android.R.color.holo_orange_light, android.R.color.holo_red_light);
// Picasso.with(getContext()).load(imagePath).into(imageView);
// Picasso.with(getContext()).load(imagePath) .memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE).into(imageView);
Glide.with(getContext())
.load(imagePath)
.asBitmap()
.into(imageView);
}
});
}
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
if (view == null) {
progress2.setVisibility(View.INVISIBLE);
}
// else {
Log.e("onLoadImage", "onLoadingComplete");
// progress2.setVisibility(View.INVISIBLE);
// }
// setLoagingCompileImage();
}
@Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
super.onLoadingFailed(imageUri, view, failReason);
if (view == null) {
progress2.setVisibility(View.INVISIBLE);
}
Log.e("onLoadingFailed", imageUri);
Log.e("onLoadingFailed", failReason.toString());
}
@Override
public void onLoadingCancelled(String imageUri, View view) {
super.onLoadingCancelled(imageUri, view);
if (view == null) {
progress2.setVisibility(View.INVISIBLE);
}
Log.e("onLoadImage", "onLoadingCancelled");
}
});
}
【讨论】：
private void showImage(ImageView img, String absolutePath) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
Bitmap bitmapPicture = BitmapFactory.decodeFile(absolutePath);
img.setImageBitmap(bitmapPicture);
}
【讨论】：
大多数答案都有效，但没有人提到高分辨率图像会减慢应用程序的速度，在我的例子中，我使用了图像 RecyclerView，它在 30 张图像中占用了 0.9 GB 的设备内存。
I/Choreographer：跳过了 73 帧！该应用程序可能也在做 在它的主线程上做了大量工作。
解决方案是 Sipmle，您可以像这里一样降低质量：Reduce resolution of Bitmap
但我使用简单的方式，Glide 处理剩下的工作
fanContext?.let {
Glide.with(it)
.load(Uri.fromFile(File(item.filePath)))
.into(viewHolder.imagePreview)
}
【讨论】：
mageView.setImageResource(R.id.img);
【讨论】：