android - 在android中按下后退时如何将图像更改回原始状态

Question

问题是我制作了一个应用程序，其中有图标。当我们点击图标时，它会改变它的图像。(即它会发光)。并打开另一个 Activity ..但是当按下后退时，它仍然处于发光状态..所以我想在按下后退时将其恢复到原始状态

package sditm.app;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;

public class page1 extends Activity {
/** Called when the activity is first created. */
ImageView about;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.page1);


    about=(ImageView)findViewById(R.id.imageView6);



    about.setClickable(true);




   about.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-gener2ated method stub
            about.setImageResource(R.drawable.helps);
            Intent i=new Intent(getApplicationContext(),aboutActivity.class);
            startActivity(i);
            Toast.makeText(getApplicationContext(), "Enter all fields", Toast.LENGTH_SHORT).show();
            about.setImageResource(R.drawable.help);

        }
    });



}
}

Answer 1

使用 onResume() 恢复图像之前的状态:

 @Override  
    protected void onResume() {  
        about.setImageResource(R.drawable.imageView6);
        super.onResume();  
    }