Button

Discussion in 'Application Development' started by andrewcweaver, Sep 4, 2010.

  1. andrewcweaver

    andrewcweaver Member
    25

    Jan 1, 2010
    17
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    25
    Shreveport, LA
    I'm new to development, and i'm trying to make a button display the word "Green" and another button to display "Orange"

    I have made the button, and changed the text, but I can't get it do to anything. I have been using this code to attempt to make the button work

    <Button android:id="@+id/Button01"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:text="Green!">
    android:gravity="bottom"
    public class MyActivity extends Activity {
    protected void onCreate(Bundle icicle) {
    super.onCreate(icicle);

    setContentView(R.layout.content_layout_id);

    final Button button = (Button) findViewById(R.id.button_id);
    button.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
    // Perform action on click android:background="@color/green"</Button>

    }
    });
    }
    }

    Please help.
     

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  2. jonbonazza

    jonbonazza Well-Known Member
    163

    Jul 13, 2010
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    Well first of all. You are not supposed to combine the XML code with the java code... The XML code goes in an XML file in the res/layout/ folder, where-as the java code goes in a java file in the src/package/ folder.


    EDIT: I am feeling generous today, so I am gonna help you out:

    res/layout/main.xml
    Code (Text):
    1.  
    2. <?xml version="1.0" encoding="utf-8"?>
    3. <LinearLayout
    4.     xmlns:android="http://schemas.android.com/apk/res/android"
    5.     android:id="@+id/LinearLayout01"
    6.     android:orientation="vertical"
    7.     android:layout_width="fill_parent"
    8.     android:layout_height="fill_parent">
    9. <Button android:id="@+id/Button01"
    10.     android:layout_width="wrap_content"
    11.     android:layout_height="wrap_content"
    12.     android:text="Green!"
    13.     android:gravity="bottom"/>
    14. </LinearLayout>
    15.  
    MyActivity.java
    Code (Text):
    1.  
    2. public class MyActivity extends Activity {
    3. Button button;
    4. LinearLayout layout;
    5. protected void onCreate(Bundle icicle) {
    6. super.onCreate(icicle);
    7.  
    8. setContentView(R.layout.main);
    9.  
    10. button = (Button) findViewById(R.id.Button01);
    11. layout = (LinearLayout) findViewById(R.id.LinearLayout01);
    12. button.setOnClickListener(new View.OnClickListener() {
    13.    public void onClick(View v) {
    14.       if(v == button) {
    15.          layout.setBackgroundColor(getResources().getColor(R.color.green); /*must have green defined in the res/values/colors.xml file.*/
    16.       }
    17.    }
    18. });
    19. }
    20. }
    21.  
     
  3. andrewcweaver

    andrewcweaver Member
    25

    Jan 1, 2010
    17
    0
    25
    Shreveport, LA
    It's in the main.xml folder.
     
  4. jonbonazza

    jonbonazza Well-Known Member
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    Jul 13, 2010
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    Here is what the structure should look similar to:

    [​IMG]

    Also see my edited post above.
     
  5. andrewcweaver

    andrewcweaver Member
    25

    Jan 1, 2010
    17
    0
    25
    Shreveport, LA
    Crashed my app. Hmm... Will show up in the layout, but not on the emulator.
     
  6. jonbonazza

    jonbonazza Well-Known Member
    163

    Jul 13, 2010
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    post the logcat.
     

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