Develop Reference

Opening application from current application

I have an Android app that can open another app I have using:
Intent intent = new Intent();
PackageManager manager = getPackageManager();
intent = manager.getLaunchIntentForPackage("myOtherAppPackageName");
intent.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(intent);
Which works perfectly, the only thing is the app force closes when I don't have the other app installed, which makes perfect sense. My question is how do I get my app to open the Play Store to the specific app for someone to download if they do not already have the other app? I would assume do the exact same thing except I don't have the package name for the Play Store.

if you have the package name you can just do this
Intent marketIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(
"market://details?id=" + "packagename"));
startActivity(marketIntent);
that will launch the play store on the page for that application

If you know package lets use this example code:
public void offerApp(Activity activity) {
Log.d("Launching Market");
Intent i = new Intent(Intent.ACTION_VIEW,
Uri.parse("market://details?id=<PACKAGE>"));
activity.startActivity(i);
}

Launch another App within an App for android

I am new to Android. Say, I open an app and I would like to open another App after clicking a button. How can I accomplish this task? Would appreciate if you can provide me some tutorial on this.

Intent intent = new Intent();
intent.setClassName("**package.name**", "**package.name.LauncherActivityName**");
startActivityForResult(intent,REQUEST_CODE);
You need to know the package and class names of the activity to call

Intent i = new Intent(Intent.ACTION_MAIN);
PackageManager manager = getPackageManager();
i = manager.getLaunchIntentForPackage("app package name");
i.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(i);

Use this code:
Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.example.package");
startActivity(launchIntent);
The app you want to launch must be on the device.

Intent appIntent = getPackageManager().getLaunchIntentForPackage("your app package name ");
startActivity(appIntent );

If the other application is a pre-packaged application mean, this tutorial may help you.
If the other application is going to be your application, then you need to learn Implicit Intent tutorials.

Also include the activity of the other application which you are planning to call in the Manifest file of the calling package also.

Can't open Market App from my Application

I'm trying to open market app from my app using:
Intent i = new Intent("Intent.ACTION_VIEW");
i.setData(Uri.parse("market://details?id=com.compamy.app"));
startActivity(i);
But I have No Activity Found Error. I am using real device and I have market installed.
So my question is: What can be done here?Thanks.

The only problem here is what zapl pointed out in the comments ("" around the action). The documentation (http://developer.android.com/guide/publishing/publishing.html) clearly states how to use this:
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=com.example.android"));
startActivity(intent);

official documantation link:
http://developer.android.com/guide/publishing/publishing.html#marketintent
Opening the app details page from your Android app
To open the Google Play details page from your application, create an intent with the ACTION_VIEW action and include a data URI in this format:
market://details?id=
For example, here's how you can create an intent and open an application's details page in Google Play:
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=com.example.android"));
startActivity(intent);

Try this:
Uri uri = Uri.parse("market://details?id=com.compamy.app");
Intent i = new Intent(Intent.ACTION_VIEW, uri);
startActivity(i);

How to open the default android browser without specifying an URL?

I'm loosing my mind over this. I want to open the user's default web browser. I can use this:
startActivity( new Intent( Intent.ACTION_VIEW, Uri.parse("http://google.com")));
To open the browser and send the user to that URL. But I don't want to send him to a specific URL, I just want to open the browser. I'm sure it's a simple solution, I just can't find it. Any Ideas?

To just open the browser without any URL opened you can use
startActivity( new Intent( Intent.ACTION_VIEW, Uri.parse("about:blank")));

After a bunch of searching, I was able to do this:
PackageManager pm = getPackageManager();
Intent queryIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));
ActivityInfo af = queryIntent.resolveActivityInfo(pm, 0);
Intent launchIntent = new Intent(Intent.ACTION_MAIN);
launchIntent.setClassName(af.packageName, af.name);
startActivity(launchIntent);
It basically says "What application would handle this?". Then it grabs that applications package and class name then fires an intent for the main action.

Is there a way to direct the user to the market for another app?

I want to direct the user from one app the user is currently running, to the market, to download another app.

The link to the market is: market://search?q=pname:your.package.name
use this in your code:
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=com.android.example"));
startActivity(intent);
from: http://developer.android.com/guide/publishing/publishing.html#marketintent

Yes. Try this:
Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse("https://market.android.com/details?id=com.hg.cyberlords"));
c.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
c.startActivity(intent);
This will open the market app with "Cyberlords" app.