安卓课程十七 Button图文混排的按钮

使用xml配置如下：activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:orientation="vertical">
<LinearLayout 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
     android:orientation="horizontal">
  
    <Button 
        android:text="@string/btnImgLeft"
        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
        android:drawableTop="@drawable/star"
        android:drawablePadding="1dp"
        />
    <Button 
        android:text="@string/btnImgRight"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:drawableRight="@drawable/star"
        android:drawablePadding="1dp"
        />
 
    <Button 
        android:text="@string/btnImgTop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:drawableBottom="@drawable/star"
        android:drawablePadding="1dp"
        />
    <Button 
        android:text="@string/btnImgBottom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:drawableLeft="@drawable/star"
        android:drawableBottom="@drawable/star"
        android:drawablePadding="1dp"
        />
 </LinearLayout>
 
    <Button 
        android:id="@+id/btnBig"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
 
</LinearLayout>

 java代码实现方式：

package com.example.btncomplext;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.DynamicDrawableSpan;
import android.text.style.ImageSpan;
import android.view.Menu;
import android.widget.Button;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		Button btn = (Button) this.findViewById(R.id.btnBig) ;
		
		String initLeft = "left";
		SpannableString spannableLeftString = new SpannableString(initLeft) ;
		Bitmap bitmapleft = BitmapFactory.decodeResource(getResources(), R.drawable.star);
		ImageSpan imageSpanLeft =new ImageSpan(MainActivity.this,bitmapleft,DynamicDrawableSpan.ALIGN_BOTTOM);
		spannableLeftString.setSpan(imageSpanLeft, 0, initLeft.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
		
		String initRigth = "right";
		SpannableString spannableRigthString = new SpannableString(initRigth) ;
		Bitmap bitmapright= BitmapFactory.decodeResource(getResources(), R.drawable.star);
		ImageSpan imageSpanRight =new ImageSpan(MainActivity.this,bitmapright);
		spannableRigthString.setSpan(imageSpanRight, 0, initRigth.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
		
		btn.append(spannableLeftString);
		btn.append("我的按钮");
		btn.append(spannableRigthString);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}