近在项目中用到动态添加图片，然后换行的实现。刚开始想用GridView，但是没用，什么原因到是忘了。下面我记录一下我的实现方式。
近在项目中用到动态添加图片，然后换行的实现。刚开始想用GridView，但是没用，什么原因到是忘了。下面我记录一下我的实现方式。
看代码xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><Button
        android:id="@+id/button1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/sel_pic_6" /><LinearLayout
        android:id="@+id/linearlayout"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical" ></LinearLayout>
</LinearLayout>

Activity：

package org.cn.ruimit.pic;  import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.util.ArrayList;  import org.cn.ruimit.R;  import android.content.Intent;  
import android.database.Cursor;  
import android.graphics.BitmapFactory;  
import android.net.Uri;  
import android.os.Bundle;  
import android.provider.MediaStore;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.ImageView;  
import android.widget.ImageView.ScaleType;  
import android.widget.LinearLayout;  
import android.widget.LinearLayout.LayoutParams;  import com.china.hunbohui.BaseActivity;  
import com.china.hunbohui.IApplication;  /** * @author wangjing */  
public class AddPicAty extends BaseActivity {  private static final int SEL_PIC = 1;  private LinearLayout linearLayout = null;  private ArrayList<ImageBean> imageBeans;  @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.add_pic_lay);  initView();  }  private void initView() {  imageBeans = new ArrayList<AddPicAty.ImageBean>();  linearLayout = (LinearLayout) findViewById(R.id.linearlayout);  findViewById(R.id.button1).setOnClickListener(new OnClickListener() {  @Override  public void onClick(View v) {  // 本地相册选取   Intent intent = new Intent(Intent.ACTION_GET_CONTENT); // "android.intent.action.GET_CONTENT"   // intent.addCategory(Intent.CATEGORY_OPENABLE);   intent.setType("image/*");  startActivityForResult(intent, SEL_PIC);  }  });  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {  super.onActivityResult(requestCode, resultCode, data);  if (resultCode == RESULT_OK) {  if (requestCode == SEL_PIC) {  Uri uri = data.getData();  String[] proj = { MediaStore.Images.Media.DATA };  Cursor cursor = managedQuery(uri, proj, null, null, null);  // 按我个人理解 这个是获得用户选择的图片的索引值   int column_index = cursor  .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);  // 将光标移至开头 ，这个很重要，不小心很容易引起越界   cursor.moveToFirst();  // 最后根据索引值获取图片路径   String path = cursor.getString(column_index);  ImageBean bean = new ImageBean();  bean.setPath(path);  imageBeans.add(bean);  updateLayout();  }  }  }  /**  * 更新图片布局  */  private void updateLayout(){  LinearLayout ll_horizontal = null;  linearLayout.removeAllViews();  for (int i = 0; i < imageBeans.size(); i++) {  if (i%4 == 0) {  ll_horizontal = new LinearLayout(context);  ll_horizontal.setOrientation(LinearLayout.HORIZONTAL);  linearLayout.addView(ll_horizontal);  }  ImageView img = new ImageView(context);  setImgLayoutParams(img);  setImageBitmap(img, imageBeans.get(i).getPath());  ll_horizontal.addView(img);  }  }  /** * 设置imageview的尺寸 */  private void setImgLayoutParams(ImageView img) {  // LayoutParams lp = (LayoutParams) img.getLayoutParams();   LayoutParams lp = new LayoutParams(0, 0);  lp.width = (int) ((IApplication.with - 20 * IApplication.dencity - 3 * 5 * IApplication.dencity) / 4);  lp.height = lp.width;  lp.rightMargin = (int) (5 * IApplication.dencity);  lp.bottomMargin = (int) (5 * IApplication.dencity);  img.setLayoutParams(lp);  img.setScaleType(ScaleType.CENTER_CROP);  }  /** * 为imageview设置图片 */  private void setImageBitmap(ImageView img,String url){  try {  FileInputStream fis = new FileInputStream(url);  img.setImageBitmap(BitmapFactory.decodeStream(fis));  } catch (FileNotFoundException e) {  e.printStackTrace();  }  }  /** * 图片对象 */  class ImageBean {  private String path;  public String getPath() {  return path;  }  public void setPath(String path) {  this.path = path;  }  }  }  

主要学习点：对图片的尺寸设置、布局的更新这两块。