Android 获取未安装的APK图标

网上关于"获取未安装的APK图标"的文章满天飞,但都是转帖,运行后的效果却是获取到Android的默认小机器人图标.那个暴寒....

现提供解决方法如下,废话不说,上效果图,见代码:

本方法需要使用到Java反射的知识,具体请参考:

http://java.sun.com/developer/technicalArticles/ALT/Reflection/index.html

借鉴的Android源码出处:

XXoo这个链接好长ooXX

package lab.sodino.fetchapkicon;
import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
/**
 * @author Sodino [e-mail]
 * @since 2011年3月1日13时00分41秒
 * */
public class FetchAPKIconAct extends Activity {
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		showUninstallAPKIcon("/sdcard/APK/JarodYv.FishPool.apk");
		getUninatllApkInfo(this, "/sdcard/APK/JarodYv.FishPool.apk");
	}
	/** 网传的方法,但获取不成功 */
	public void getUninatllApkInfo(Context context, String archiveFilePath) {
		PackageManager pm = context.getPackageManager();
		PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);
		if (info != null) {
			ApplicationInfo appInfo = info.applicationInfo;
			Drawable icon = pm.getApplicationIcon(appInfo);
			ImageView image = (ImageView) findViewById(R.id.apkIconByTradition);
			image.setVisibility(View.VISIBLE);
			image.setImageDrawable(icon);
		}
	}
	//
	private void showUninstallAPKIcon(String apkPath) {
		String PATH_PackageParser = "android.content.pm.PackageParser";
		String PATH_AssetManager = "android.content.res.AssetManager";
		try {
			// apk包的文件路径
			// 这是一个Package 解释器, 是隐藏的
			// 构造函数的参数只有一个, apk文件的路径
			// PackageParser packageParser = new PackageParser(apkPath);
			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。
			Log.d("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) {
			e.printStackTrace();
		}
	}
}

 

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