[英]Change the background image of a button
I am using two buttons, one for next news and one for previous news. 我正在使用两个按钮,一个用于下一则新闻,一个用于先前新闻。 In my activity when I am on the first news my button should set the image with the grey image and when I move forward my previous news button should change from the grey image to the colored one. 在活动中,当我收到第一个新闻时,我的按钮应将图像设置为灰色图像,而当我向前移动时,我先前的新闻按钮应从灰色图像变为彩色图像。 Similarly when I reach at the last news my next button should change to grey image. 同样,当我到达最新消息时,我的下一个按钮应更改为灰色图像。
This is my xml file. 这是我的xml文件。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFFFF"
>
<TextView
android:id="@+id/tv_submitDate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="Medium Text"
android:textColor="#000000"
android:padding="5dp"/>
<TextView
android:id="@+id/tv_headline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/tv_submitDate"
android:text="Medium Text"
android:textColor="#000000"
android:textStyle="bold"
android:padding="5dp"/>
<View
android:id="@+id/viewSeperator"
android:layout_width="fill_parent"
android:layout_height="2dip"
android:layout_below="@+id/tv_headline"
android:background="#FF909090" />
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/btn_relative_layout"
android:layout_below="@+id/viewSeperator" android:padding="10dp">
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/tv_detailNews"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textColor="#000000" />
</LinearLayout>
</ScrollView>
<LinearLayout
android:id="@+id/btn_relative_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#DCDCDC"
android:padding="10sp" >
<Button
android:id="@+id/btn_prevNews"
android:layout_width="120sp"
android:layout_height="40sp"
android:layout_weight="0.5"
android:layout_marginRight="5sp"
android:background="@drawable/arrow_left"
android:clickable="true" />
<Button
android:id="@+id/btn_nextNews"
android:layout_width="120sp"
android:layout_height="40sp"
android:layout_marginLeft="5sp"
android:layout_weight="0.5"
android:background="@drawable/arrow_right"
android:clickable="true" />
</LinearLayout>
</RelativeLayout>
This is where I am trying to change the image of my button: 这是我尝试更改按钮图像的地方:
public void onClick(View v) {
if (v == btnPrevNews && newsId > 0) {
if (newsId > 0) {
newsId--;
putDetailNewsinView(newsId);
} else if (newsId == 0) {
btnPrevNews
.setBackgroundResource(R.drawable.disable_arrow_left);
btnPrevNews.setEnabled(false);
}
// btnPrevNews.setVisibility(View.INVISIBLE);
} else if (v == btnNextNews && newsId < newsListDetail.size() - 1) {
if (newsId < newsListDetail.size() - 1) {
newsId++;
putDetailNewsinView(newsId);
if(newsId == 0)
btnNextNews.setBackgroundDrawable(getResources().getDrawable(
R.drawable.disable_arrow_right));
} else if (newsId == newsListDetail.size()) {
// btnNextNews.setVisibility(View.INVISIBLE);
btnNextNews.setBackgroundDrawable(getResources().getDrawable(
R.drawable.disable_arrow_right));
// btnNextNews.setBackgroundResource(R.drawable.disable_arrow_right);
btnNextNews.setEnabled(false);
}
}
}
Please help me out in this. 请帮助我。
Thanks in advance. 提前致谢。
I assume you have Methods which will be executed if the Button is pressed. 我假设您有如果按下按钮将要执行的方法。 Just use these and add Logic to change the Background of these Buttons to grey: Give both Buttons an ID, you can access these Buttons with: Button mybutton = (Button) findViewById(R.id.yourid);
只需使用这些按钮并添加Logic即可将这些按钮的背景更改为灰色:为两个按钮提供ID,您可以使用以下命令访问这些按钮: Button mybutton = (Button) findViewById(R.id.yourid);
Now you can do all kinds of things with your button, like changing the background. 现在,您可以使用按钮执行各种操作,例如更改背景。
edit: The Problem could lay in the Pictures, but if i were you, i would set some breakpoints and debug step-by-step. 编辑:问题可能出在图片上,但是如果我是你,我会设置一些断点并逐步调试。
I hacked some code of mine to test this functionality, it works fine for me. 我破解了我的一些代码来测试此功能,对我来说很好用。 Here is it: 就这个:
package my.namespac;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class SomeTestProjectActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = (Button)findViewById(R.id.btn_prevNews);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Button b = (Button)v;
v.setBackgroundDrawable(getResources().getDrawable(R.drawable.koala));
}
});
}
}
And the Layout-Xml: 和Layout-Xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btn_prevNews"
android:layout_width="120sp"
android:layout_height="40sp"
android:layout_weight="0.5"
android:layout_marginRight="5sp"
android:background="@drawable/ic_launcher"
android:clickable="true" />
</LinearLayout>
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