4.2 设计具有背景图的按钮:ImageButton

最新推荐文章于 2021-04-18 10:40:24 发布

wuchaowen0668

最新推荐文章于 2021-04-18 10:40:24 发布

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分类专栏： Android界面文章标签： Android OS XML

本文链接：https://blog.youkuaiyun.com/wuchaowen0668/article/details/83905971

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本文介绍了一个Android应用示例，展示了如何使用ImageButton组件，并通过OnFocusChangeListener和OnClickListener监听器来响应焦点变化和点击事件，进而改变TextView的内容及ImageButton的显示效果。

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package com.chaowen;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.ImageButton;
public class ImageButtonText extends Activity {
    /** Called when the activity is first created. */
	private ImageButton mImageButton;
	private Button mButton1;
	private TextView mTextView1;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mImageButton=(ImageButton)findViewById(R.id.myImageButton1);
        mButton1=(Button)findViewById(R.id.myButton1);
        mTextView1=(TextView)findViewById(R.id.myTextView1);
        //通过OnFocusChangeListener来响应ImageButton的OnFocus事件
        mImageButton.setOnFocusChangeListener(new OnFocusChangeListener() {
			
			public void onFocusChange(View v, boolean hasFocus) {
				//若ImageButton状态为OnFocus改变Imagebutton图片
				//并改变Textview的文字
				if(hasFocus==true){
					mTextView1.setText("图片按钮状态为:Got Focus");
					mImageButton.setImageResource(R.drawable.iconfull);
				}else {
					mTextView1.setText("图片按钮状态为:Lost Focus");
					mImageButton.setImageResource(R.drawable.iconempty);
				}
				
			}
		});
        
        //通过OnClickListener来响应ImageButton的OnClick事件
        mImageButton.setOnClickListener(new OnClickListener() {
			
			public void onClick(View v) {
			 mTextView1.setText("图片按钮状态为:Got Click");
			 mImageButton.setImageResource(R.drawable.iconfull);
				
			}
		});
        
        
        //通过OnClickListener来响应button的Onclick事件
        mButton1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				mTextView1.setText("图片按钮状态为:Lost Focus");
				mImageButton.setImageResource(R.drawable.iconempty);;
				}
		});
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/white"
    >
<TextView
    android:id="@+id/myTextView1"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:text="@string/str_textview1"
    />

<ImageButton
   android:id="@+id/myImageButton1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:src="@drawable/iconempty" />
<Button 
   android:id="@+id/myButton1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/str_button1" />
   
</LinearLayout>