基本上,下面的代码是我用来从远程服务器检索图像的代码。我的问题是,每当我有像700x700这样的大图像时,它会缩小整个图像,直到它只适合屏幕。我真正想要的是每当我有这样的大图像时,我希望它保持原样,并显示垂直和水平滚动条。这有可能实现吗?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/imageView"
android:visibility="gone"
android:layout_width="200dp"
android:layout_height="200dp"/>
</LinearLayout>
然后我的主要活动ImageDownload.java
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
public class ImageDownload extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView mainImageView = (ImageView) findViewById(R.id.imageView);
ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar);
String imageurl = "http://4.bp.blogspot.com/-xRyw7I08tDM/TgNqD2Ij-3I/AAAAAAAAAOU/FGjboxE-u2U/s1600/cute_cat_cute_1-s357x422-47520.jpg";
ImageDownloadMessageHandler imageDownloadMessageHandler1= new ImageDownloadMessageHandler(progressBar, mainImageView);
ImageDownlaodThread imageDownlaodThread = new ImageDownlaodThread(imageDownloadMessageHandler1,imageurl);
imageDownlaodThread.start();
}
class ImageDownlaodThread extends Thread {
ImageDownloadMessageHandler imageDownloadMessageHandler;
String imageUrl;
public ImageDownlaodThread(ImageDownloadMessageHandler imageDownloadMessageHandler, String imageUrl) {
this.imageDownloadMessageHandler = imageDownloadMessageHandler;
this.imageUrl = imageUrl;
}
@Override
public void run() {
Drawable drawable = LoadImageFromWebOperations(imageUrl);
Message message = imageDownloadMessageHandler.obtainMessage(1, drawable);
imageDownloadMessageHandler.sendMessage(message);
System.out.println("Message sent");
}
}
class ImageDownloadMessageHandler extends Handler {
ProgressBar progressBar;
View imageTextView;
public ImageDownloadMessageHandler(ProgressBar progressBar, View imageTextView) {
this.progressBar = progressBar;
this.imageTextView = imageTextView;
}
@Override
public void handleMessage(Message message) {
progressBar.setVisibility(View.GONE);
imageTextView.setBackgroundDrawable(((Drawable) message.obj));
imageTextView.setVisibility(View.VISIBLE);
}
}
Drawable LoadImageFromWebOperations(String url) {
Drawable d = null;
InputStream is = null;
try {
is = (InputStream) new URL(url).getContent();
d = Drawable.createFromStream(is, "src name");
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return d;
}
}
答案 0 :(得分:3)
试试这个:
<ScrollView android:id="@+id/scrollView1"
android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout android:id="@+id/linearLayout1" android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical">
<HorizontalScrollView android:id="@+id/horizontalScrollView1"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<LinearLayout android:id="@+id/linearLayout2"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="horizontal">
<TextView/>
<ImageView/>
<ProgressBar/>
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
</ScrollView>
这样你可以同时进行垂直和水平滚动。
答案 1 :(得分:0)
为此目的发明了布局元素ScrollView和HorizontalScrollView。