I\'ve been programming Android in Eclipse for about a year now and I have always launched my app by right clicking on my project name in the project explorer, followed by \"run
If you want to run your app when a XML file is open in your eclipse you must set your run configuration Eclipse -> run -> run configuration -> Android Application in left window -> your configuration -> android tab in right window -> launch -> select your main activity
Eclipse toolbar has green run button which has default meaning run last selected configuration. Just click there.
I am not sure why the last answer is voted down, as I think it is the best answer. In the standard ADT Eclipse tool bar, there is the following button:
If you are editing a Java file, and press this button, your app will automatically be launched. Thus, this is one the one button press to launch your app.
As with the other shortcuts mentioned here, this does not work if you are editing an XML file (so ensure your editor is showing a Java file).
On MacOSX, for me worked Cmd+Shift+F11, which came down on laptop keyboard to Cmd+fn+Shift+F11
1) Eclipse/Window > Preferences > Run/Debug > Launching
2) Select 'Always launch the previously launched application' in the 'Launch Operation' section.
3) Then just use your shortcut of choice. I think Ctrl + F11 is the default for this
Someone suggested the above and it worked for me!