Android布局java代码

    一般来说我们在Android中用XML布局要方便很多同时也要快捷。但是有时候在一些特殊的情况我们也可以用代码代替XML的布局，其效果一样的。如TextView的布局：

 <TextView ndroid:text="@+id/TextView01" android:id="@+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content"> </TextView> 

其代码也相当于：

LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);final TextView tv = new TextView(this); tv.setText("Hello Android!"); tv.setGravity(1); tv.setId(TestView01); layout.addView(tv,param); setContentView(layout);

下面是一个实例来演示一下

package AdView.AD.android;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.widget.ImageView;import android.widget.LinearLayout;public class AdView extends Activity{private static final int myImageView1 = 0;private ImageView mImageView1; boolean run=true; String uriPic = "http://www.51kdl.com/images/logo2.gif"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout layout = new LinearLayout(this); layout.setOrientation(LinearLayout.VERTICAL); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT); ImageView iv= new ImageView(this); iv.setId(myImageView1); layout.addView(iv,params); setContentView(layout); mImageView1 = (ImageView) findViewById(myImageView1); new Thread(mTasks).start(); } public void onDestroy(){ run=false;super.onDestroy(); } public void getimage(){ mImageView1.setImageBitmap(getURLBitmap()); } public Bitmap getURLBitmap() { URL imageUrl = null; Bitmap bitmap = null; try { /* new URL对象将网址传入 */ imageUrl = new URL(uriPic); } catch (MalformedURLException e) { e.printStackTrace(); } try { /* 取得联机 */ HttpURLConnection conn = (HttpURLConnection) imageUrl .openConnection(); conn.connect(); /* 取得回传的InputStream */ InputStream is = conn.getInputStream(); /* 将InputStream变成Bitmap */ bitmap = BitmapFactory.decodeStream(is); /* 关闭InputStream */ is.close(); } catch (IOException e) { e.printStackTrace(); } return bitmap; } private Runnable mTasks =new Runnable(){ public void run() { while(run){ try{ Thread.sleep(500); mHandler.sendMessage(mHandler.obtainMessage()); }catch(InterruptedException e) { e.printStackTrace(); } } } }; Handler mHandler = new Handler(){ public void handleMessage(Message msg) { super.handleMessage(msg); getimage(); } };}

其中在Androidmainfest.xml中要插入：< uses- permission android:name="android.permission.INTERNET"></uses-permission>