更改按钮上的背景图片，然后单击android应用程序开发 [英] Changing background image on button click android app development

问题描述

我正在尝试更改某项活动的背景图片 单击按钮，但无法执行此操作.你们能告诉我我该怎么做吗?

I am trying to change the background image of an activity on button click, but not being able to do so. Can you guys tell me how can I can do that?

Button b = (Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        try
        {
            Activity activity = Selection.this;
            //Drawable db = Drawable..createFromPath(R.drawable.love1);

            // The below line gives error because setbackgroundImage 
            // is supposed to take a drawable object as an argument. 
            // Now what to do?                                  
            activity.findViewById(android.R.id.content)
            .setBackground(Drawable.createFromPath("res/love1.jpg"));

            // What to do to correct the above line?

            mySong = MediaPlayer.create(Selection.this, R.raw.song1);
            mySong.start();
        }
        catch(Exception ee){
            TextView tv = (TextView) findViewById(R.id.textView1);
            tv.setText(ee.getMessage());
        }
    }
});

我尝试使用setBackgroundColor对Color.RED进行操作，但这也无法正常工作. PS:我没有更改xml文件中的任何内容来完成此操作.

I tried with Color.RED using setBackgroundColor but that too is not working. PS: I have not changed anything in the xml file for accomplishing this.

推荐答案

我认为最简单的方法是使用xml文件中的布局进行活动.例如:

I think the easiest way is to use layout in your xml file for your activity.. for example:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/linearLayoutID" 
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:background="@drawable/background_img1" >

，然后在需要时从活动"中将其更改单击按钮后:

and then change it from your Activity when you want e.g. after the button click:

 LinearLayout mLinearLayout = (LinearLayout) findViewById(R.id.linearLayoutID);
 mLinearLayout.setBackgroundResource(R.drawable.background_img2);

这篇关于更改按钮上的背景图片，然后单击android应用程序开发的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！