CODEWITHSUNDEEP
android
Tom the Newb
Tom the Newb

Reputation: 41

Eclipse doesn't run android app when I click Run

I'm trying to do the first app tutorial. After editing the 2 xml files, activity_main and strings, the instructions say, "In Eclipse, click Run from the toolbar."

First off, it showed me some problems. With the EditText set to android:layout_weight="1", it doesn't like the android:layout_height set to wrap_content and shows me on the Problems tab. The problem goes away if I set layout_height to 0dp like the width.

Second, now that it shows me nothing in the problems list, hitting run doesn't do anything, either on the windows computer or on my android device connected via usb and set up according to the previous instructions.

I found another thread with similar question. They suggested he look at his AndroidManifest.xml and MainActivity.java. Mine seem to contain what they suggested needed to be there. Oh! I see my avid is open, but it doesn't seem to say anything.

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    <EditText android:id = "@+id/edit_message"
        android:layout_weight="1"
        android:layout_width = "0dp"
        android:layout_height = "0dp"
        android:hint="@string/edit_message"/>
    <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text = "@string/button_send"/>
</LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">My First App</string>
    <string name="action_settings">Settings</string>
    <string name="edit_message">Edit your message, silly.</string>
    <string name="button_send">Send</string>
    <string name="title_activity_man">MainActivity</string>

</resources>

Upvotes: 3

Views: 4837

Answers (5)

user2125722
user2125722

Reputation: 1328

Create an AVD for using emulator or make sure your phone is detected by eclipse. Also go to Run Configurations,create a new configuration for Android Application and select your Android project.

Upvotes: 1

Areeb Gillani
Areeb Gillani

Reputation: 450

Boy its not a problem. You just have to select your application and run it as an android app. Moreover, check in AVD manager that either you have your virtual machine up and running. If not then start it first. Assuming that you have already created your AVD. Now goto the main activity and hit the run button and yupiee. =P

Upvotes: 0

Dan Amato
Dan Amato

Reputation: 624

The Run button in Eclipse doesn't function when you're on an XML file. Open up one of the .java files, then hit Run - it should compile and run the app.

Upvotes: 8

nrcrast
nrcrast

Reputation: 171

I'm going to assume you're using Eclipse. Did you actually start your virtual device? When I created my first project, I created the virtual device but forgot to actually click start. Nothing happened when I clicked run.

Try right clicking on your project and going to Run As -> Android App.

Upvotes: 0

Vikram
Vikram

Reputation: 51581

Not able to reproduce this error:

First off, it showed me some problems. With the EditText set to android:layout_weight="1", it doesn't like the android:layout_height set to "wrap_content" and shows me on the Problems tab.

Even if your app runs, it will only show the button on the right side of the display. The EditText will not be visible. This is because you are setting the EditText's height to 0dp.

Since you are setting the layout_weight attribute of the EditText to 1, and the LinearLayout's orientation is horizontal(by default), you only need to set the width of EditText to 0dp. This will make the EditText take as much width as it can with the rest taken by the button, whose width is set to wrap_content.

This should help you understand the options you have while working with LinearLayouts: LinearLayout.LayoutParams.

Upvotes: 0

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