在Android Studio中加载图片 [英] Load Image in Android Studio
问题描述
我想从我的数据库中显示ImageView中的图像...但我失败了...并且没有显示错误...
I want to show image in ImageView from my database... but I was failed.. and no error showing...
这是我的MainFragment（按Detailtxt工作正常的方式..）
this is my MainFragment (By the way Detailtxt is working normally..)
public class MainFragment extends Fragment {
ProgressDialog pDialog;
JSONArray str_json = null;
private static final String TAG_URL = "http://192.168.1.118/symanlub/readpromo.php";
public static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
JSONParser jsonParser = new JSONParser();
TextView detailtxt;
ImageView img;
View rootview;
public MainFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
rootview = inflater.inflate(R.layout.fragment_main, container, false);
new Bukaprofil().execute();
return rootview;
}
class Bukaprofil extends AsyncTask<String, String, String>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Sedang menampilkan...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... arg) {
new Thread(new Runnable() {
@Override
public void run() {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
Log.d("request!", "starting");
JSONObject json = jsonParser.makeHttpRequest(
TAG_URL, "GET", params);
// checking log for json response
Log.d("Proses ambil data", json.toString());
try {
str_json = json.getJSONArray("hasil");
JSONObject ar = str_json.getJSONObject(0);
//fetch data
final String edetail = ar.getString("detail");
final String egambar = ar.getString("img");
//label
detailtxt = (TextView)rootview.findViewById(R.id.detailtxt);
//gambar
img = (ImageView)rootview.findViewById(R.id.gambar);
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
//gambar
ImageLoader imgLoader = new ImageLoader(getActivity());
imgLoader.DisplayImage(egambar, img);
detailtxt.setText(edetail);
}
});
} catch (JSONException e) {
e.printStackTrace();
}
}
}).start();
return null;
}
@Override
protected void onPostExecute(String s) {
pDialog.dismiss();
}
}
}
这是我的fragment_main.xml
this is my fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical"
android:background="#fff">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollbars="vertical">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="10dp">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginBottom="15dp">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/gambar"
android:layout_width="match_parent"
android:layout_height="450dip"
android:src="@drawable/pertamina222"
android:background="#fff"/>
</LinearLayout>
</LinearLayout>
<TextView
android:id="@+id/detailtxt"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Test"
android:layout_marginBottom="5dp"
android:textStyle="bold"
android:textSize="16sp"/>
</LinearLayout>
</ScrollView>
</LinearLayout>
这是我在Imageloader.java中的DisplayImage
and this is my DisplayImage in Imageloader.java
final int stub_id=R.drawable.gg;
public void DisplayImage(String url, ImageView imageView)
{
imageViews.put(imageView, url);
Bitmap bitmap=memoryCache.get(url);
if(bitmap!=null)
imageView.setImageBitmap(bitmap);
else
{
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
你可以看到stub_id = R. drawable.gg;..并且在fragment_main.xml中显示的图像是来自drawable的gg.jpg .....
就像bitmapp结果为null ..我不知道如何解决这个问题.. 。
you can see "stub_id=R.drawable.gg;".. and the image that show in fragment_main.xml is gg.jpg from drawable..... is like bitmapp result is null.. I dont't know how to fix that...
请帮帮我!!先谢谢，抱歉我的英文不好...
please help me!! Thanks before and sorry for my bad english...
推荐答案
您可以使用名为 Picasso 显示图像。
You can use a third party library named Picasso to display image .
首先在 build.gradle 文件中添加gradle依赖项
First add the gradle dependency in your build.gradle file
编译'com.squareup.picasso：picasso：2.5.2'
compile 'com.squareup.picasso:picasso:2.5.2'
添加后，build.gradle文件可能如下所示
After adding , your build.gradle file may look like this
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.0.0'
compile 'com.squareup.picasso:picasso:2.5.2'
}
然后代替这个
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
//gambar
ImageLoader imgLoader = new ImageLoader(getActivity());
imgLoader.DisplayImage(egambar, img);
detailtxt.setText(edetail);
}
});
使用此
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
//gambar
Picasso.with(getActivity()).load(egambar).into(img);
}
});
编辑
如果你不想缓存
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
//gambar
Picasso.with(getActivity())
.load(egambar)
.memoryPolicy(MemoryPolicy.NO_CACHE)
.into(img);
}
});
这篇关于在Android Studio中加载图片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
