先上图:
点击张开,再点击收回。一开始,还以为有多复杂,原来就两下搞定。
我们知道Button可以有好多state.pressed/clicked/checked等,实现点击效果,就用state_list _drawable(忘了叫什么,反正意识差不多)好,而箭头呢?
这个就麻烦了,首先你想到肯定是drawableRight属性,但是要和selector配合,还是难以实现。所以只要把箭头切换放在代码里面就行了。
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Button android:id="@+id/bt"
android:text="开始"
android:textColor="#fff"
android:textSize="20sp"
android:background="@drawable/bt_bg"
android:layout_width="100dp"
android:layout_height="50dp"
/>
</LinearLayout>
bt_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_pressed="true" >
<shape>
<solid android:color="#001122"/>
</shape>
</item>
<item >
<shape>
<solid android:color="#221100"/>
</shape>
</item>
</selector>
MainActivity.java
package com.bvin.del;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
Button bt;
boolean btIsOpen = false;
Drawable arrowUp,arrowDown;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initRes();
initViews();
}
void initRes(){//
arrowUp = getResources().getDrawable(R.drawable.ic_arrow_up_black);
arrowDown = getResources().getDrawable(R.drawable.ic_arrow_down_black);
arrowUp.setBounds(0, 0, arrowUp.getMinimumWidth(), arrowUp.getMinimumHeight());
arrowDown.setBounds(0, 0, arrowUp.getMinimumWidth(), arrowUp.getMinimumHeight());
}
void initViews(){
bt = (Button)findViewById(R.id.bt);
bt.setCompoundDrawables(null, null, arrowDown, null);
bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(btIsOpen){//打开状态
Log.e("开关", "关闭");
bt.setText("关闭");
bt.setCompoundDrawables(null, null,arrowDown , null);
btIsOpen = false;
}else {//默认状态
Log.e("开关", "打开");
bt.setText("打开");
bt.setCompoundDrawables(null, null, arrowUp, null);
btIsOpen = true;
}
}
});
}
}