不在xml中设置布局，在代码中直接写个布局，显示下载的图片，如下图所示，图片有点丑
XML中添加个linearLayout
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="${relativePackage}.${activityClass}" ><TextViewandroid:id="@+id/text"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="九宫格显示图片" /><LinearLayoutandroid:id="@+id/report_photo_layout"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="10dip"android:orientation="vertical" android:layout_below="@+id/text"/>
</RelativeLayout>
另外加个布局，显示图片view_files_image.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center" ><ImageViewandroid:id="@+id/image"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_centerHorizontal="true"android:scaleType="centerCrop" />
</RelativeLayout>
其他就是代码了：
public class MainActivity extends Activity {private LinearLayout layoutPhotos;//private LinkedHashMap<String, String> choosePhotos = new LinkedHashMap<String, String>();//已选择的照片private DisplayMetrics dm = new DisplayMetrics();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);layoutPhotos = (LinearLayout) findViewById(R.id.report_photo_layout);//choosePhotos哦让其中添加图片地址choosePhotos.put("1", "http://lllqmw.qiniudn.com/1.png");choosePhotos.put("2", "http://lllqmw.qiniudn.com/2.png");choosePhotos.put("3", "http://lllqmw.qiniudn.com/3.png");choosePhotos.put("4", "http://lllqmw.qiniudn.com/4.png");choosePhotos.put("5", "http://lllqmw.qiniudn.com/5.png");choosePhotos.put("6", "http://lllqmw.qiniudn.com/6.png");choosePhotos.put("7", "http://lllqmw.qiniudn.com/7.png");choosePhotos.put("8", "http://lllqmw.qiniudn.com/8.png");//显示图片layoutShowFiles();}/*** 九宫格的方式显示下载的图片*/private void layoutShowFiles() {layoutPhotos.removeAllViews();// 每行四张视图，计算一下第个的宽高getWindowManager().getDefaultDisplay().getMetrics(dm);int margins = (int) dm.density * 2;int photoWidth = (int) (((dm.widthPixels - dm.density * 30) / 3) - margins * 2.5);Log.i("info", "每个view的尺寸为：" + photoWidth + ",间距为：" + margins);LinearLayout subLayout = new LinearLayout(this);subLayout.setOrientation(LinearLayout.HORIZONTAL);LayoutParams subParams = new LayoutParams(photoWidth, photoWidth);subParams.setMargins(margins, margins, margins, margins);int i = 0;Iterator<Entry<String, String>> iter = choosePhotos.entrySet().iterator();while (iter.hasNext()) {subLayout.addView(createLayoutPhoto(i, iter.next().getValue(), subParams));if (i % 3 == 2) {layoutPhotos.addView(subLayout, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));subLayout = new LinearLayout(this);subLayout.setOrientation(LinearLayout.HORIZONTAL);}i++;}// 计算一下sublayout还能放几个view，如果已经摆満了4个，刚新起一行if ((3 - choosePhotos.size() % 3) == 3) {subLayout = new LinearLayout(this);subLayout.setOrientation(LinearLayout.HORIZONTAL);}layoutPhotos.addView(subLayout, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));}/*** 生成一个图片* @param id* @param path* @param params* @return*/private View createLayoutPhoto(final int imagePosition, final String path, LayoutParams params) {View v = getLayoutInflater().inflate(R.layout.view_files_image, null);v.setLayoutParams(params);ImageLoader.getInstance().displayImage(path, (ImageView) v.findViewById(R.id.image),SoftApplication.imageOptions);return v;}}下载图片需要的application
public class SoftApplication extends Application { public static DisplayImageOptions imageOptions ;@Overridepublic void onCreate() {super.onCreate();initImageLoader(getApplicationContext());//设置图片属性：下载时的图片，下载失败的图片，是否圆角imageOptions = new DisplayImageOptions.Builder().cacheInMemory(true).cacheOnDisc(true).showImageOnLoading(R.drawable.default_loading) // 加载开始默认的图片.showImageForEmptyUri(R.drawable.default_loading) // url爲空會显示该图片，自己放在drawable里面的.showImageOnFail(R.drawable.default_loading) // 加载图片出现问题，会显示该图片.imageScaleType(ImageScaleType.IN_SAMPLE_INT).bitmapConfig(Bitmap.Config.RGB_565).build();}public static void initImageLoader(Context context) {ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context).threadPriority(Thread.NORM_PRIORITY - 2).denyCacheImageMultipleSizesInMemory().discCacheFileNameGenerator(new Md5FileNameGenerator()).tasksProcessingOrder(QueueProcessingType.LIFO).writeDebugLogs() // Remove for release app.build();ImageLoader.getInstance().init(config);} }
有个地方容易忘记：AndroidManifest.xml 声明
<applicationandroid:name="com.example.demo_imagedisplay.SoftApplication"
ok了，点击Demo_imageDisplay下载完整代码。
