通过点击一个按钮，改变Android SDK中的背景颜色不工作 [英] Changing background color in Android SDK by clicking a button does not work

问题描述

我有一个简单的程序，它是能够点击按钮之后改变背景颜色，但它不工作

 公共类ChangeBackgroundActivity延伸活动{
/ **当第一次创建活动调用。 * /
    按钮blueButton;
    MYLO的LinearLayout;
    @覆盖
   公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;
        这款mylo =（的LinearLayout）findViewById（R.layout.main）;
        blueButton =（按钮）findViewById（R.id.button1）;
        blueButton.setOnClickListener（新OnClickListener（）{            公共无效的onClick（查看为arg0）{
            // TODO自动生成方法存根
            myLO.setBackgroundColor（0x0000FF）; //蓝色code＃0000FF
        }
    }）;
    }
}
 

解决方案

尝试用这个，

的main.xml

 ＆LT; LinearLayout中的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
        的xmlns：工具=htt​​p://schemas.android.com/tool​​s
        机器人：ID =@ + ID / myLayout
        机器人：layout_width =FILL_PARENT
        机器人：layout_height =FILL_PARENT＆GT;        ＆LT;按钮
            机器人：ID =@ + ID /按钮1
            机器人：layout_width =WRAP_CONTENT
            机器人：layout_height =WRAP_CONTENT
            机器人：layout_alignParentLeft =真
            机器人：layout_alignParentTop =真
            机器人：layout_marginLeft =64dp
            机器人：layout_marginTop =71dp
            机器人：文字=changeColor/＆GT;    ＆LT; / LinearLayout中＆GT;
 

ChangeBackgroundActivity.java

 公共类ChangeBackgroundActivity延伸活动{
/ **当第一次创建活动调用。 * /
    按钮blueButton;
    MYLO的LinearLayout;
    @覆盖
   公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;
        这款mylo =（的LinearLayout）findViewById（R.id.myLayout）;
        blueButton =（按钮）findViewById（R.id.button1）;
        blueButton.setOnClickListener（新OnClickListener（）{            公共无效的onClick（查看为arg0）{
            // TODO自动生成方法存根
            myLO.setBackgroundColor（Color.BLUE）;        }
    }）;
    }
}
 

I have a simple program which is able to change the background color after clicking a button, but it does not work

public class ChangeBackgroundActivity extends Activity {
/** Called when the activity is first created. */
    Button blueButton;
    LinearLayout myLO;
    @Override
   public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myLO=(LinearLayout)findViewById(R.layout.main);
        blueButton=(Button)findViewById(R.id.button1);
        blueButton.setOnClickListener(new OnClickListener() {

            public void onClick(View arg0) {
            // TODO Auto-generated method stub
            myLO.setBackgroundColor(0x0000FF); //blue color code #0000FF    
        }
    });
    }
}

解决方案

Try With this,

main.xml

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/myLayout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="64dp"
            android:layout_marginTop="71dp"
            android:text="changeColor" />

    </LinearLayout>

ChangeBackgroundActivity.java

public class ChangeBackgroundActivity extends Activity {
/** Called when the activity is first created. */
    Button blueButton;
    LinearLayout myLO;
    @Override
   public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myLO=(LinearLayout)findViewById(R.id.myLayout);
        blueButton=(Button)findViewById(R.id.button1);
        blueButton.setOnClickListener(new OnClickListener() {

            public void onClick(View arg0) {
            // TODO Auto-generated method stub
            myLO.setBackgroundColor(Color.BLUE);

        }
    });
    }
}

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