如何解决如何显示从 mysqldatabase 获取的图像到 imageview
并且我已将图像的 url 保存在表中，其中包含用户的所有详细信息....
所以我尝试的是从数据库中获取图像的 url，然后尝试将其设置为 imageview..
如上图所示，它没有在 imageview 中设置图像，但是当我在定义变量时首先将 url 分配给 imgurl 变量时，它可以正常工作...
我不知道为什么会发生这种情况……我做错了什么还是有其他方法可以实现这一目标？
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolBox.StringRequest;
import com.android.volley.toolBox.Volley;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
public class Dashboard extends AppCompatActivity {
TextView usrname;
ImageView profileimg;
public static String imgurl = "";//here
/**
* Shared Preferences
**/
SharedPreferences sharedPreferences;
public static final String mypreference = "mypref";
public static final String Name = "nameKey";
public static final String Email = "emailKey";
/**
* Shared Preferences
**/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setdisplayShowTitleEnabled(false);
profileimg = findViewById(R.id.iv_display_image);
usrname = findViewById(R.id.tv_username);
/**Shared Preferences**/
sharedPreferences = getSharedPreferences(mypreference,Context.MODE_PRIVATE);
/**Shared Preferences**/
//fetching session data
String name = sharedPreferences.getString(Name,"0");
usrname.setText(name);
fetchimg(name);
LoadImage loadImage = new LoadImage(profileimg);
Log.d("Oncreate img url",imgurl);
loadImage.execute(imgurl);
}
private void fetchimg(String name) {
StringRequest request = new StringRequest(Request.Method.POST,"https://**url**//fetchimg.PHP",new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (response.startsWith("Here")) {
String urlstr = getUrl(response,"Here ");
seturl(urlstr);
Log.d("urlstr value:",urlstr);
} else {
Toast.makeText(getApplicationContext(),response,Toast.LENGTH_SHORT).show();
Log.d("vOLLEY ERROR",response.toString());
}
}
},new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(),error.getMessage(),Toast.LENGTH_SHORT).show();
Log.d("vOLLEY ERROR",error.getMessage().toString());
}
}
) {
@Override
protected Map<String,String> getParams() throws AuthFailureError {
Map<String,String> params = new HashMap<String,String>();
params.put("login_name","xxxxx");
params.put("login_pass","xxxxx");
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(Dashboard.this);
requestQueue.add(request);
}
private void seturl(String urlstr) {
this.imgurl = urlstr;
Log.d("Image url set inside seturl",imgurl);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.dashboardmenu,menu);
return true;
}
public void openeditprofile(View view) {
startActivity(new Intent(this,EditProfileActivity.class));
}
private class LoadImage extends AsyncTask<String,Void,Bitmap> {
ImageView imageView;
public LoadImage(ImageView profileimg) {
this.imageView = profileimg;
}
@Override
protected Bitmap doInBackground(String... strings) {
String urlLink = strings[0];
Bitmap bitmap = null;
try {
InputStream inputStream = new java.net.URL(urlLink).openStream();
bitmap = BitmapFactory.decodeStream(inputStream);
} catch (IOException e) {
e.printstacktrace();
}
return bitmap;
}
@Override
protected void onPostExecute(Bitmap bitmap) {
profileimg.setimageBitmap(bitmap);
}
}
public static String getUrl(String string,String word) {
// Check if the word is present in string
// If found,remove it using removeAll()
if (string.contains(word)) {
// To cover the case
// if the word is at the
// beginning of the string
// or anywhere in the middle
String tempWord = word + " ";
string = string.replaceAll(tempWord,"");
// To cover the edge case
// if the word is at the
// end of the string
tempWord = " " + word;
string = string.replaceAll(tempWord,"");
}
// Return the resultant string
return string;
}
}
解决方法
您正在异步获取图像，您的 Asynctask execute 将使用空 imgUrl 调用，因为它尚未获取，将 AsyncTask 执行代码移至获取的 onResponse 中
private void fetchimg(String name) {
StringRequest request = new StringRequest(Request.Method.POST,"https://**url**//fetchimg.php",new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (response.startsWith("Here")) {
String urlstr = getUrl(response,"Here ");
seturl(urlstr);
//here the url is ready to consume
Log.d("urlstr value:",urlstr);
//load the image now
LoadImage loadImage = new LoadImage(profileimg);
Log.d("Oncreate img url",imgurl);
loadImage.execute(imgurl);
} else {
Toast.makeText(getApplicationContext(),response,Toast.LENGTH_SHORT).show();
Log.d("vOLLEY ERROR",response.toString());
}
}
},new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(),error.getMessage(),Toast.LENGTH_SHORT).show();
Log.d("vOLLEY ERROR",error.getMessage().toString());
}
}
) {
@Override
protected Map<String,String> getParams() throws AuthFailureError {
Map<String,String> params = new HashMap<String,String>();
params.put("login_name","xxxxx");
params.put("login_pass","xxxxx");
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(Dashboard.this);
requestQueue.add(request);
}
use **Glide** to display Image from Url into image view.
You have to add glide lib in app-level build.gradle file.
implementation 'com.github.bumptech.glide:glide:4.12.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'
Glide.with(this).load(url)
.transform(CenterCrop(),RoundedCorners(radius))
.placeholder(R.drawable.drawable_image_placeholder)
.error(R.drawable.drawable_image_placeholder)
.into(ivProfile)
drawable_image_placeholder is the default imageview that displays
when getting the error to load the image. ivProfile is imageview .
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