Android java代碼 布局

 一般來說我們在Android中用XML布局要方便很多同時也要快捷。但是有時候在一些特殊的情況我們也可以用代碼代替XML的布局，其效果一樣的。如TextView的布局：
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<TextView
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    ndroid:text="@+id/TextView01"
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    android:id="@+id/TextView01"
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    android:layout_width="wrap_content"
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    android:layout_height="wrap_content">
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    </TextView>
其代碼也相當於：

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LinearLayout.LayoutParams param =
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  new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
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final TextView tv = new TextView(this);
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        tv.setText("Hello Android!");
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        tv.setGravity(1);
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        tv.setId(TestView01);
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        layout.addView(tv,param);
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        setContentView(layout);
 下面是一個實例來演示一下

 
 
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package AdView.AD.android;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.HttpURLConnection;
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import java.net.MalformedURLException;
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import java.net.URL;
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import android.app.Activity;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import android.widget.ImageView;
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import android.widget.LinearLayout;
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public class AdView extends Activity
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{
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private static final int myImageView1 = 0;
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private ImageView mImageView1;
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  boolean run=true;
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  String uriPic = "http://up.2cto.com/2012/0816/20120816104135808.gif";
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  /** Called when the activity is first created. */
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  @Override
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  public void onCreate(Bundle savedInstanceState)
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  {
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    super.onCreate(savedInstanceState);
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    LinearLayout layout = new LinearLayout(this);
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    layout.setOrientation(LinearLayout.VERTICAL);
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    LinearLayout.LayoutParams params =
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    new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
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    ImageView iv= new ImageView(this);
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    iv.setId(myImageView1);
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    layout.addView(iv,params);
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    setContentView(layout);
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    mImageView1 = (ImageView) findViewById(myImageView1);
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    new Thread(mTasks).start();
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  }
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  public void onDestroy(){
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    run=false;
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    super.onDestroy();
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  }
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   public void getimage(){
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    mImageView1.setImageBitmap(getURLBitmap());
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   }
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  public Bitmap getURLBitmap()
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  {
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    URL imageUrl = null;
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    Bitmap bitmap = null;
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    try
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    {
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      /* new URL對象將網址傳入 */
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      imageUrl = new URL(uriPic);
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    } catch (MalformedURLException e)
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    {
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      e.printStackTrace();
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    }
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    try
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    {
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      /* 取得聯機 */
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      HttpURLConnection conn = (HttpURLConnection) imageUrl
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          .openConnection();
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      conn.connect();
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      /* 取得回傳的InputStream */
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      InputStream is = conn.getInputStream();
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      /* 將InputStream變成Bitmap */
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      bitmap = BitmapFactory.decodeStream(is);
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      /* 關閉InputStream */
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      is.close();
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    } catch (IOException e)
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    {
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      e.printStackTrace();
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    }
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    return bitmap;
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  }  
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     private Runnable mTasks =new Runnable(){
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     public void run()
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         {
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         while(run){
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         try{
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         Thread.sleep(500);
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         mHandler.sendMessage(mHandler.obtainMessage());
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         }catch(InterruptedException e)
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        {
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         e.printStackTrace();
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         }
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         }
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         }
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     };
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     Handler mHandler = new Handler(){
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     public void handleMessage(Message msg)
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         {
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         super.handleMessage(msg);
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         getimage();
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     }
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     };
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}
其中在Androidmainfest.xml中要插入：< uses- permission android:name="android.permission.INTERNET"></uses-permission>