MainActivity如下:
package cn.testimage;
import android.os.Bundle;
import android.widget.Button;
import android.app.Activity;
import android.graphics.drawable.Drawable.ConstantState;
/**
* Demo描述:
* 依据Drawable的ConstantState判断两张图片是否是drawable中同一张图片
*
*/
public class MainActivity extends Activity {
private Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
mButton=(Button) findViewById(R.id.button);
ConstantState buttonConstantState=
mButton.getBackground().getConstantState();
ConstantState resourceConstantState=
getResources().getDrawable(R.drawable.ic_launcher).getConstantState();
boolean isEqual=buttonConstantState.equals(resourceConstantState);
System.out.println("isEqual="+isEqual);
}
}
main.xml如下:
<RelativeLayout 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"
>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/ic_launcher"
android:layout_centerInParent="true"
/>
</RelativeLayout>
