anroid內置了Button和ImageButton，但是沒有提供既能顯示圖片又能顯示文字的button。
這里我自定義了一個ImageTextButton
其中了XML文件中使用了自定義屬性custom:icon="@drawable/icon"
下面是ImageTextButton源碼：

    
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.widget.Button;

public class ImageTextButton extends Button {
	private final String namespace =  "http://www.iteye.com/custom";
	private int resourceId =0;
	private Bitmap bitmap;
	public ImageTextButton(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
		setClickable(true);
		//默認使用R.drawable.icon這張圖片
		resourceId = attrs.getAttributeResourceValue(namespace, "icon", R.drawable.icon);
		bitmap = BitmapFactory.decodeResource(getResources(), resourceId);
	}
	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		//圖片頂部居中顯示
		int x=(this.getMeasuredWidth()-bitmap.getWidth())>>1;
		int y=0;
        canvas.drawBitmap(bitmap, x, y, null); 
        //坐標需要轉換，因為默認情況下Button中的文字居中顯示
        //這里需要讓文字在底部顯示
		canvas.translate(0, (this.getMeasuredHeight()>>1)-(int)this.getTextSize());
		
		super.onDraw(canvas);
	}

    public void setIcon(Bitmap bitmap){
		this.bitmap=bitmap;
                invalidate();
	}
    public void setIcon(int resourceId){
		this.bitmap=BitmapFactory.decodeResource(getResources(), resourceId);
                invalidate();
	}
}

  

    
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:custom="http://www.iteye.com/custom"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

    <com.wt.app.ImageTextButton 
    android:text="OK"
    custom:icon="@drawable/icon"
    android:id="@+id/button_0" 
	android:layout_width="80dip" 
	android:layout_height="80dip"
    />
    <com.wt.app.ImageTextButton 
    android:text="OK"
    custom:icon="@drawable/icon"
    android:id="@+id/button_1" 
	android:layout_width="80dip" 
	android:layout_height="100dip"
	android:textSize="30dip"
	android:textColor="#ff0000"
    />
    
    <com.wt.app.ImageTextButton 
    android:text="OK"
    custom:icon="@drawable/icon"
    android:id="@+id/button_2" 
	android:layout_width="200dip" 
	android:layout_height="200dip"
	android:textSize="30dip"
    />
   
</LinearLayout>


  

另一種實現：

    
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.MotionEvent;
import android.view.View;
 
public class ImageTextButton extends View{
 
private final static int WIDTH_PADDING = 8;
private final static int HEIGHT_PADDING = 10;
private final static int SPACE = 10;
private final String label;
private final int imageResId;
private final Bitmap image;
private int fontWidth;
private int fontHeight;
 
public ImageTextButton(final Context c,int rid,String text){
super(c);
this.label = text;
this.imageResId = rid;
this.image = BitmapFactory.decodeResource(c.getResources(),imageResId);
setFocusable(true);
setClickable(true);
getFontWidthAndHeight();
}
 
private void getFontWidthAndHeight(){
Paint pFont = new Paint(); 
Rect rect = new Rect(); 
pFont.getTextBounds("信 ", 0, 1, rect); 
this.fontHeight = rect.height();
this.fontWidth = rect.width();
}
 
private int getTextWidth(String text){
return text.length()*this.fontWidth;
}
 
@Override
protected void onFocusChanged(boolean gainFocus, int direction,
Rect previouslyFocusedRect) {
if (gainFocus == true){
this.setBackgroundColor(Color.rgb(255, 165, 0));
}
else{
this.setBackgroundColor(Color.alpha(0));
}
}
 
@Override
protected void onDraw(Canvas canvas) {
Paint textPaint = new Paint();
textPaint.setColor(Color.WHITE);
canvas.drawBitmap(image, WIDTH_PADDING / 2, HEIGHT_PADDING / 2, null);
canvas.drawText(label, (image.getWidth()-getTextWidth(label)/2)/ 2, (HEIGHT_PADDING / 2) +
image.getHeight() + 8+SPACE, textPaint);
}
 
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
this.setBackgroundColor(Color.rgb(255, 165, 0));
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
this.setBackgroundColor(Color.alpha(0));
break;
}
 
return super.onTouchEvent(event);
}
 
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(measureWidth(widthMeasureSpec),measureHeight(heightMeasureSpec));
}
 
private int measureWidth(int measureSpec){
int preferred = image.getWidth() * 2;
return getMeasurement(measureSpec, preferred);
}
private int measureHeight(int measureSpec){
   int preferred = image.getHeight()+this.fontHeight+SPACE*2;
   return getMeasurement(measureSpec, preferred);
}
 
private int getMeasurement(int measureSpec, int preferred){
  int specSize = MeasureSpec.getSize(measureSpec);
int measurement = 0;
switch(MeasureSpec.getMode(measureSpec)){
case MeasureSpec.EXACTLY:
measurement = specSize;
break;
case MeasureSpec.AT_MOST:
measurement = Math.min(preferred, specSize);
break;
default:
measurement = preferred;
break;
}
return measurement;
}
 
public String getLabel(){
return label;
}  
 
public int getImageResId(){
return imageResId;
}
 
}

  

說說Android 兩種為自定義組件添加屬性的使用方法和區別
http://terryblog.blog.51cto.com/1764499/414884

Android高手進階教程(四)之----Android 中自定義屬性(attr.xml,TypedArray)的使用!
http://blog.csdn.net/Android_Tutor/archive/2010/04/20/5508615.aspx

linearlayout繼承擴展篇
http://wang-peng1.iteye.com/blog/576151

另一篇：編寫Android自定義按鈕
http://marshal.easymorse.com/archives/3059


實現按鈕，這里沒有通過Button類或者子類去做派生，而是通過TextView派生出來的。在這里三個按鈕是三個TextView派生類實例，中間的白線，是1px寬的白色矩形，這樣就可以做出類似上面的效果。
看布局文件：

    
<?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/background_color"> 
    <LinearLayout android:layout_width="fill_parent" 
        android:layout_height="10dip" /> 
    <LinearLayout android:layout_width="fill_parent" 
        android:layout_height="40dip"> 
        <com.easymorse.textbutton.TextButton 
            android:layout_width="fill_parent" android:layout_height="fill_parent" 
            android:layout_weight="1" android:text="電影" 
            android:gravity="center_vertical|center_horizontal" 
            android:background="@drawable/button" android:focusable="true" android:clickable="true"/> 
        <View android:layout_width="2px" android:layout_height="fill_parent" 
            android:background="#ffffffff" /> 
        <com.easymorse.textbutton.TextButton 
            android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" 
            android:layout_weight="1" android:text="電視" 
            android:gravity="center_vertical|center_horizontal" 
            android:background="@drawable/button" android:focusable="true" /> 
        <View android:layout_width="2px" android:layout_height="fill_parent" 
            android:background="#ffffffff" /> 
        <com.easymorse.textbutton.TextButton 
            android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" 
            android:layout_weight="1" android:text="明星" 
            android:gravity="center_vertical|center_horizontal" 
            android:background="@drawable/button" android:focusable="true" /> 
    </LinearLayout> 
</LinearLayout>

  

這里需要注意的幾點：

對于布局的像素設置，一般要用dip，這樣在更大或者更小的屏幕下展示可以自動適配，如果是px，是物理像素，這樣在小的屏幕里面可能會顯得大，在大的屏幕中顯得小
在按鈕布局中要使用android:focusable="true" android:clickable="true"，這樣才能比如通過軌跡球聚焦到按鈕上，才能用手觸摸按鈕的時候觸發事件
點擊按鈕變色，主要在android:background="@drawable/button"配置，button配置了點擊事件發生后的背景色改變，而不需要編寫代碼
下面來看看drawable/button.xml文件：

    
<?xml version="1.0" encoding="utf-8"?> 
<selector xmlns:android="http://schemas.android.com/apk/res/android" 
    android:constantSize="true"> 
    <item android:state_focused="true"> 
        <shape> 
            <gradient android:startColor="#FFE5CF33" android:endColor="#FFF1E7A2" 
                android:angle="90.0"> 
            </gradient> 
        </shape> 
    </item> 
    <item android:state_enabled="true" android:state_pressed="false"> 
        <shape> 
            <gradient android:startColor="#FF1B1B1B" android:endColor="#FF969696" 
                android:angle="90.0"> 
            </gradient> 
        </shape> 
    </item> 
    <item android:state_enabled="true" android:state_pressed="true"> 
        <shape> 
            <gradient android:startColor="#FF000000" android:endColor="#FF474747" 
                android:angle="90.0"> 
            </gradient> 
        </shape> 
    </item> 
    <item android:state_enabled="false" android:state_pressed="true"> 
        <shape> 
            <gradient android:startColor="#FF000000" android:endColor="#FF474747" 
                android:angle="90.0"> 
            </gradient> 
        </shape> 
    </item> 
    <item> 
        <shape> 
            <gradient android:startColor="#FF000000" android:endColor="#FF474747" 
                android:angle="90.0"> 
            </gradient> 
        </shape> 
    </item> 
</selector>

  

這個文件中定義了當條目（也就是按鈕）enable和（或）pressed的情況下的背景漸近色的配置情況。

實際上，上面介紹的部分，在不使用自定義按鈕（也就是不是<com.easymorse.textbutton.TextButton而直接寫<TextView…）的情況下，已經可以出現除了點擊后Toast消息。
說一下TextView的派生類，其實只是在touche按鈕的時候顯示提示信息：

    
import android.content.Context; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.View; 
import android.widget.TextView; 
import android.widget.Toast;

public class TextButton extends TextView {

    public TextButton(Context context) { 
        super(context); 
    }

    public TextButton(Context context, AttributeSet attrs, int defStyle) { 
        super(context, attrs, defStyle); 
    }

    public TextButton(final Context context, AttributeSet attrs) { 
        this(context, attrs, 0);

        this.setOnTouchListener(new OnTouchListener() {

            @Override 
            public boolean onTouch(View v, MotionEvent event) { 
                if (event.getAction() == MotionEvent.ACTION_CANCEL 
                        || event.getAction() == MotionEvent.ACTION_UP 
                        || event.getAction() == MotionEvent.ACTION_OUTSIDE) { 
                    Toast.makeText(context, "touched", Toast.LENGTH_SHORT).show(); 
                } 
                return false; 
            } 
        }); 
    }

}

  

在這里主要是寫了設置OnTouchListener的代碼。

這里只針對3種情況才顯示提示：

當手指從按鈕抬起，ACTION_UP
取消，ACTION_CANCEL
手指移出按鈕，ACTION_OUTSIDE
另外，要返回false，因為返回true，系統將不會調用drawable/button.xml的效果，因為true表示自己已經處理了onTouche事件，不需要別的邏輯再處理了。
源代碼見： http://easymorse.googlecode.com/svn/tags/textButton-0.1.0/

用自定義Button實現ToggleButton
http://marshal.easymorse.com/archives/3045

附送：自定義的豎著的seekbar(轉)

自定義圖文并茂的Button