<Button 
  android:id="@+id/bt3"
  android:layout_marginTop="4dp"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="火车"
  android:textSize="16sp"
  android:textColor="#000000"
  android:paddingLeft="5dp"
  android:paddingTop="5dp"
  android:paddingRight="5dp"
  android:paddingBottom="5dp"
  android:drawableLeft="@drawable/line_bus_icon"
  android:background="@drawable/button_bg">
</Button>

package com.test;
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 ImageTextButton2 extends Button {
  private int resourceId = 0;
  private Bitmap bitmap;
  public ImageTextButton2(Context context) {
    super(context,null);
  }
  public ImageTextButton2(Context context,AttributeSet attributeSet) {
    super(context, attributeSet);
    this.setClickable(true);
    resourceId = R.drawable.icon;
    bitmap = BitmapFactory.decodeResource(getResources(), resourceId);
  }
  public void setIcon(int resourceId) 
  {
    this.bitmap = BitmapFactory.decodeResource(getResources(), resourceId);
    invalidate();
  }
  @Override
  protected void onDraw(Canvas canvas) {
    // TODO Auto-generated method stub
    // 图片顶部居中显示
    int x = (this.getMeasuredWidth() - bitmap.getWidth())/2;
    int y = 0;
    canvas.drawBitmap(bitmap, x, y, null);
    // 坐标需要转换，因为默认情况下Button中的文字居中显示
    // 这里需要让文字在底部显示
    canvas.translate(0,(this.getMeasuredHeight()/2) - (int) this.getTextSize());
    super.onDraw(canvas);
  }
}

<com.test.ImageTextButton2
  android:id="@+id/bt2"
  android:layout_marginTop="10dp"
  android:text="hello"
  android:textSize="15dp"
  android:textColor="#000000"
  android:layout_width="60dp"
  android:layout_height="70dp"
  android:background="@drawable/button_bg"
/>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content">
 <ImageView
  android:id="@+id/imgview"
  android:layout_alignParentTop="true"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_centerInParent="true"
  android:src="@drawable/icon">
 </ImageView>
 <TextView
  android:id="@+id/textview"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_centerInParent="true"
  android:layout_below="@id/imgview">
 </TextView>
</RelativeLayout>

package com.test;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class ImageTextButton1 extends RelativeLayout {
  private ImageView imgView; 
  private TextView textView;
  public ImageTextButton1(Context context) {
    super(context,null);
  }
  public ImageTextButton1(Context context,AttributeSet attributeSet) {
    super(context, attributeSet);
    LayoutInflater.from(context).inflate(R.layout.img_text_bt, this,true);
    this.imgView = (ImageView)findViewById(R.id.imgview);
    this.textView = (TextView)findViewById(R.id.textview);
    this.setClickable(true);
    this.setFocusable(true);
  }
  public void setImgResource(int resourceID) {
    this.imgView.setImageResource(resourceID);
  }
  public void setText(String text) {
    this.textView.setText(text);
  }
  public void setTextColor(int color) {
    this.textView.setTextColor(color);
  }
  public void setTextSize(float size) {
    this.textView.setTextSize(size);
  }
}

<com.test.ImageTextButton1 
  android:id="@+id/bt1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:background="@drawable/button_bg"
/>

bt1 = (ImageTextButton1)findViewById(R.id.bt1);
bt1.setText("icon");
bt1.setTextColor(Color.rgb(0, 0, 0));
bt1.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
 // TODO Auto-generated method stub
 Toast.makeText(MainActivity.this, "bt1被点击了", Toast.LENGTH_SHORT).show();
  }
});