以编程方式安装apk而不定义apk名称

Question

I am trying to install apk programmatically from SD card without mentioning the name of the apk. What I can do now is I can get installed the apk I named in my code. But it is not handy if I want to have another apk installed on my device and for that I have to go into my code and change the name of the apk. Is there any way to get the name of the apk file dynamically on run time? For instance getting a list of installable apk, so that user can choose which one to install?

Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(
Uri.parse("file:///mnt/sdcard/extsd/download   /app.apk"),
"application/vnd.android.package-archive");
startActivity(intent);

Answer 1

Update: The previous code was deleted because contain errors. Here is a working code:

public class InstallAPKActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ExtFilter apkFilter = new ExtFilter("apk");
        File file[] = Environment.getExternalStorageDirectory().listFiles(apkFilter);
        Log.d("InstallApk", "Filter applied. Size: "+ file.length);

        for (int i=0; i < file.length; i++)
        {
            Log.d("InstallApk", "FileName:" + file[i].getName());
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.fromFile(file[i]), "application/vnd.android.package-archive");
            startActivity(intent);
        }





    }

    class ExtFilter implements FilenameFilter { 
        String ext; 
        public ExtFilter(String ext) { 
            this.ext = "." + ext; 
        } 
        public boolean accept(File dir, String name) { 
            return name.endsWith(ext); 
        }
    }
}

Update 2: This program simply enumerates all apk file and writes them to the array of File. After that it tries to install all this apk files sequentially. For instance, in my case I put application golddream.apk on a sdcard of my emulator. The application is developed for SDK v 10. I see the following output in my logcat:

12-21 06:44:39.453: D/InstallApk(14897): Filter applied. Size: 1
12-21 06:44:39.453: D/InstallApk(14897): FileName:golddream.apk
12-21 06:44:39.463: I/ActivityManager(62): Starting: Intent { act=android.intent.action.VIEW dat=file:///mnt/sdcard/golddream.apk typ=application/vnd.android.package-archive cmp=com.android.packageinstaller/.PackageInstallerActivity } from pid 14897
12-21 06:44:40.073: I/ActivityManager(62): Displayed com.android.packageinstaller/.PackageInstallerActivity: +578ms (total +1s229ms)