如何用一些predefined TIME_INTERVAL自动更改从URL中图像的ImageView？ [英] how to change images from the url in ImageView automatically with some predefined time_interval?
问题描述
这是我的主类：
$
`公共类MainActivity延伸活动实现Runnable
{
$ `public class MainActivity extends Activity implements Runnable {
ImageView im1,im2,im3;
int b,p=0,j,k,l;
String b1 ;
Bitmap img;
Bitmap bm;
ArrayList<String> arl = new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
im1 = (ImageView)findViewById(R.id.imageView1);
im2 = (ImageView)findViewById(R.id.imageView2);
im3 = (ImageView)findViewById(R.id.imageView3);
arl.add("http://dev.purpletab.com/files/jewels/original/Jewel_1344148107.png");
arl.add("http://dev.purpletab.com/files/jewels/original/Jewel_1332428944.png");
arl.add("http://dev.purpletab.com/files/jewels/original/Jewel_1341902610.png");
while(p<1)
{
for(j=0;j<3;j++)
{
Bitmap bitmap1 = DownloadImage(arl.get(j));
Log.e("image of j : ", ""+bitmap1);
im1.setImageBitmap(bitmap1);
delay();
k=j+1;
if(k==3)
k=0;
Bitmap bitmap2 = DownloadImage(arl.get(k));
Log.e("image of k : ", ""+bitmap2);
im2.setImageBitmap(bitmap2);
delay();
l=k+1;
if(l==3)
l=0;
Bitmap bitmap3 = DownloadImage(arl.get(l));
Log.e("image of l : ", ""+bitmap3);
im3.setImageBitmap(bitmap3);
delay();
}
p++;
}
}
private void delay()
{
Thread t = new Thread()
{
public void run()
{
Log.e("entered thread", " entered run method");
try
{
Log.e("entered for loop ", "loop : ");
Thread.sleep(10000);
}
catch(Exception e)
{
Log.e("thread error", ""+e);
}
}
};
t.start();
Log.e("started thread", ""+t);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private Bitmap DownloadImage(String URL)
{
Log.e("bitmap d/l",""+URL);
Bitmap bitmap = null;
InputStream in = null;
try
{
in = OpenHttpConnection(URL);
bitmap = BitmapFactory.decodeStream(in);
Log.e("downloaded images ", " images ");
in.close();
}
catch (IOException e1)
{
e1.printStackTrace();
Log.e("started thread", ""+e1);
}
return bitmap;
}
private InputStream OpenHttpConnection(String urlString)throws IOException
{
InputStream in = null;
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection))throw new IOException("Not an HTTP connection");
try
{
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK)
{
in = httpConn.getInputStream();
Log.e("download in progress", " . . . ");
}
else if(response != HttpURLConnection.HTTP_OK)
{
//ProfileImgPreview.setBackgroundResource(R.drawable.photo_bg);
}
}
catch (Exception ex)
{
throw new IOException("Error connecting");
}
return in;
}
@Override
public void run() {
Log.e("started the other thread", "not defined");
}
}`
这是我的布局code：
AND THIS IS MY LAYOUT CODE :
$`
<ImageView
android:id="@+id/imageView1"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_centerHorizontal="true"
android:layout_alignParentTop="true"
android:contentDescription="@string/app_name"
android:src="@drawable/a0"/>
<ImageView
android:id="@+id/imageView2"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_centerHorizontal="true"
android:layout_below="@+id/imageView1"
android:contentDescription="@string/app_name"
android:src="@drawable/a1"/>
<ImageView
android:id="@+id/imageView3"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_centerHorizontal="true"
android:layout_below="@+id/imageView2"
android:contentDescription="@string/app_name"
android:src="@drawable/a2"/>
`
所以，当我运行此code，只有最后一个图像的浏览和图像是根据给定的延迟不改变。我的意思是最后的图像加载为静态图像，但我需要它作为动画视图。可能有人PLZ回答我？
so when i run this code , only the last image is viewed and the images are not changing according to the delay given . i mean the last images are loaded as static images , but i need it as animated view . could anybody plz answer me ?
THANKYOU在前进。 。 。 。 。
THANKYOU IN ADVANCE . . . . .
推荐答案
您延时函数什么都不耽误的onCreate，它只是开始在后台线程它什么都不做。的onCreate就会继续它的线程（您的应用程序主UI线程）上运行。
Your delay function does nothing to delay onCreate, it just starts a Thread in background which does nothing. onCreate simply proceeds to run on its thread (your apps main ui thread).
推迟一些动作的正确方法是调用您的ImageView postDelayed 功能：
The right way to delay some action would be to call postDelayed function on your ImageView:
im1.postDelayed(new Runnable() {
public void run() {
//Code to change image
}
}, 5000);
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