Android判断运用是否存在

通过包名判断

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	public boolean checkBrowser(String packageName) {		if (packageName == null || "".equals(packageName))			return false;		try {			ApplicationInfo info = getPackageManager().getApplicationInfo(					packageName, PackageManager.GET_UNINSTALLED_PACKAGES);			return true;		} catch (NameNotFoundException e) {			return false;		}	}

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判断包中的Activity

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		Intent intent = new Intent(Intent.ACTION_VIEW);		intent.setClassName("com.android.settings", //$NON-NLS-1$				"com.android.settings.InstalledAppDetails"); //$NON-NLS-1$		intent.putExtra("com.android.settings.ApplicationPkgName", //$NON-NLS-1$				mCurrentPkgName);		List<ResolveInfo> acts = getPackageManager().queryIntentActivities(				intent, 0);		if (acts.size() > 0) {			startActivity(intent);		} else {			Toast.makeText(this,					getString(R.string.failed_to_resolve_activity),					Toast.LENGTH_SHORT).show();		}

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