我搜索了答案，但找不到。
问题：
根据选定的微调器项目，应用程序应该显示不同的图像。
此刻我无法让它工作。
Url 的工作方式如下：“my.site.com/images/”imc_met “.png”
是 imc_met 是文件名。
我无法让它工作。
顺便说一句，应用程序还没有完成
package example.myapplication;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Spinner;
public class itemsActivity extends Activity {
private Spinner spinner1, spinner2;
private Button btnSubmit;
private Bitmap image;
private ImageView imageView;
private String imc_met, imc;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.items);
addItemsOnSpinner2();
addListenerOnButton();
addListenerOnSpinnerItemSelection();
}
// add items into spinner dynamically
public void addItemsOnSpinner2() {
spinner2 = (Spinner) findViewById(R.id.spinner2);
List<String> list = new ArrayList<String>();
list.add("list 1");
list.add("list 2");
list.add("list 3");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(dataAdapter);
}
public void addListenerOnSpinnerItemSelection() {
spinner1 = (Spinner) findViewById(R.id.spinner1);
spinner1.setOnItemSelectedListener(new CustomOnItemSelectedListener());
}
// get the selected dropdown list value
public void addListenerOnButton() {
spinner1 = (Spinner) findViewById(R.id.spinner1);
spinner2 = (Spinner) findViewById(R.id.spinner2);
btnSubmit = (Button) findViewById(R.id.btnSubmit);
spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
if(spinner1.getSelectedItem()!=null){
imc_met = spinner1.getSelectedItem().toString();
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
imageView = (ImageView)findViewById(R.id.ImageView01);
btnSubmit.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
URL url = null;
try {
url = new URL("my.site.com"); //here should the right link appear.
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
if (url != null) {
image = BitmapFactory.decodeStream(url.openStream());
}
} catch (IOException e) {
e.printStackTrace();
}
imageView.setImageBitmap(image);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
编辑
请发布生成正确 URL 所需的全部代码。