怎么从SDK中获得未安装的APK信息（名称图标）

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怎么从SDK中获得未安装的APK信息（名称图标）5

最近在做一个项目，怎么能够把SD卡中的APK文件扫描出来，我现在用File类里面的方法可以得到APK的名称，但是就是无法获得APK的图标，各位高手们指点迷津。

问题补充：

raito_yagami 写道

网上一搜一大把。。。

网上的那些复制粘贴的能行我也就不会在这里请教大家了我的代码是这样的

private void showUninstallAPKIcon(String apkPath) {

String PATH_PackageParser = "android.content.pm.PackageParser";
String PATH_AssetManager = "android.content.res.AssetManager";
try {
Class pkgParserCls = Class.forName(PATH_PackageParser);
Class[] typeArgs = new Class[1];
typeArgs[0] = String.class;
Constructor pkgParserCt = pkgParserCls.getConstructor(typeArgs);
Object[] valueArgs = new Object[1];
valueArgs[0] = apkPath;
Object pkgParser = pkgParserCt.newInstance(valueArgs);
Log.d("ANDROID_LAB", "pkgParser:" + pkgParser.toString());

// 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况
DisplayMetrics metrics = new DisplayMetrics();
metrics.setToDefaults();
// PackageParser.Package mPkgInfo = packageParser.parsePackage(new
// File(apkPath), apkPath,
// metrics, 0);
typeArgs = new Class[4];
typeArgs[0] = File.class;
typeArgs[1] = String.class;
typeArgs[2] = DisplayMetrics.class;
typeArgs[3] = Integer.TYPE;
Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod(
"parsePackage", typeArgs);
valueArgs = new Object[4];
valueArgs[0] = new File(apkPath);
valueArgs[1] = apkPath;
valueArgs[2] = metrics;
valueArgs[3] = 0;
Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser,
valueArgs);
// 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开
// ApplicationInfo info = mPkgInfo.applicationInfo;
Field appInfoFld = pkgParserPkg.getClass().getDeclaredField(
"applicationInfo");
ApplicationInfo info = (ApplicationInfo) appInfoFld
.get(pkgParserPkg);
// uid 输出为"-1"，原因是未安装，系统未分配其Uid。
System.out
.println("****************ANDROID_LAB*********************"
+ "pkg:" + info.packageName + " uid=" + info.uid);
// Resources pRes = getResources();
// AssetManager assmgr = new AssetManager();
// assmgr.addAssetPath(apkPath);
// Resources res = new Resources(assmgr, pRes.getDisplayMetrics(),
// pRes.getConfiguration());
Class assetMagCls = Class.forName(PATH_AssetManager);
Constructor assetMagCt = assetMagCls.getConstructor((Class[]) null);
Object assetMag = assetMagCt.newInstance((Object[]) null);
typeArgs = new Class[1];
typeArgs[0] = String.class;
Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod(
"addAssetPath", typeArgs);
valueArgs = new Object[1];
valueArgs[0] = apkPath;
assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);
Resources res = getResources();
typeArgs = new Class[3];
typeArgs[0] = assetMag.getClass();
typeArgs[1] = res.getDisplayMetrics().getClass();
typeArgs[2] = res.getConfiguration().getClass();
Constructor resCt = Resources.class.getConstructor(typeArgs);
valueArgs = new Object[3];
valueArgs[0] = assetMag;
valueArgs[1] = res.getDisplayMetrics();
valueArgs[2] = res.getConfiguration();
res = (Resources) resCt.newInstance(valueArgs);
CharSequence label = null;
if (info.labelRes != 0) {
label = res.getText(info.labelRes);
}
// if (label == null) {
// label = (info.nonLocalizedLabel != null) ? info.nonLocalizedLabel
// : info.packageName;
// }
Log.d("ANDROID_LAB", "label=" + label);
// 这里就是读取一个apk程序的图标
if (info.icon != 0) {
Drawable icon = res.getDrawable(info.icon);
ImageView image = (ImageView) findViewById(R.id.apkIconBySodino);
image.setVisibility(View.VISIBLE);
image.setImageDrawable(icon);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

在执行到Field appInfoFld = pkgParserPkg.getClass().getDeclaredField("applicationInfo");
会报空指针 05-11 10:00:10.960: WARN/PackageParser(1638): Skipping dir: /sdcardunionpay_jx.apk
05-11 10:00:10.960: WARN/System.err(1638): java.lang.NullPointerException
05-11 10:00:10.960: WARN/System.err(1638):     at com.java.FileExplemActivity.showUninstallAPKIcon(FileExplemActivity.java:119)
05-11 10:00:10.960: WARN/System.err(1638):     at com.java.FileExplemActivity.refresh(FileExplemActivity.java:66)
05-11 10:00:10.960: WARN/System.err(1638):     at com.java.FileExplemActivity.onCreate(FileExplemActivity.java:46)
05-11 10:00:10.960: WARN/System.err(1638):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-11 10:00:10.960: WARN/System.err(1638):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1618)
05-11 10:00:10.960: WARN/System.err(1638):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1670)
05-11 10:00:10.960: WARN/System.err(1638):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-11 10:00:10.960: WARN/System.err(1638):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-11 10:00:10.960: WARN/System.err(1638):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-11 10:00:10.960: WARN/System.err(1638):     at android.os.Looper.loop(Looper.java:123)
05-11 10:00:10.960: WARN/System.err(1638):     at android.app.ActivityThread.main(ActivityThread.java:3695)
05-11 10:00:10.960: WARN/System.err(1638):     at java.lang.reflect.Method.invokeNative(Native Method)
05-11 10:00:10.960: WARN/System.err(1638):     at java.lang.reflect.Method.invoke(Method.java:507)
05-11 10:00:10.960: WARN/System.err(1638):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
05-11 10:00:10.960: WARN/System.err(1638):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
05-11 10:00:10.960: WARN/System.err(1638):     at dalvik.system.NativeStart.main(Native Method)

不明白为什么会报这错误