Android判断应用是否存在

通过包名判断

 

 

	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;
		}
	}

 

 

判断包中的Activity

 

 

		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();
		}