How to launch an Activity from another Application in Android

Question

I want to launch an installed package from my Android application. I assume that it is possible using intents, but I didn't find a way of doing it. Is there a link, where to find the information?

Answer 1

If you don't know the main activity, then the package name can be used to launch the application.

Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.package.address"); if (launchIntent != null) {      startActivity(launchIntent);//null pointer check in case package name was not found } 

Answer 2

I know this has been answered but here is how I implemented something similar:

Intent intent = getPackageManager().getLaunchIntentForPackage("com.package.name"); if (intent != null) {     // We found the activity now start the activity     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     startActivity(intent); } else {     // Bring user to the market or let them choose an app?     intent = new Intent(Intent.ACTION_VIEW);     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     intent.setData(Uri.parse("market://details?id=" + "com.package.name"));     startActivity(intent); } 

Even better, here is the method:

public void startNewActivity(Context context, String packageName) {     Intent intent = context.getPackageManager().getLaunchIntentForPackage(packageName);     if (intent != null) {         // We found the activity now start the activity         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);         context.startActivity(intent);     } else {         // Bring user to the market or let them choose an app?         intent = new Intent(Intent.ACTION_VIEW);         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);         intent.setData(Uri.parse("market://details?id=" + packageName));         context.startActivity(intent);     } } 

Removed duplicate code:

public void startNewActivity(Context context, String packageName) {     Intent intent = context.getPackageManager().getLaunchIntentForPackage(packageName);     if (intent == null) {         // Bring user to the market or let them choose an app?         intent = new Intent(Intent.ACTION_VIEW);         intent.setData(Uri.parse("market://details?id=" + packageName));     }     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     context.startActivity(intent); }