Android 单击时如何更改ImageButton的图像
我正在尝试使用“播放”按钮制作媒体播放器,每次单击“播放”按钮时,它都会变为“暂停”按钮。下面是我的代码,但每当我点击播放按钮时,按钮就会消失,什么也没发生Android 单击时如何更改ImageButton的图像,android,android-studio,imagebutton,Android,Android Studio,Imagebutton,我正在尝试使用“播放”按钮制作媒体播放器,每次单击“播放”按钮时,它都会变为“暂停”按钮。下面是我的代码,但每当我点击播放按钮时,按钮就会消失,什么也没发生 public class MainActivity extends Activity { boolean isPressed = false; private ImageButton btnTest; @Override protected void onCreate(Bundle savedInstanceState) {
public class MainActivity extends Activity {
boolean isPressed = false;
private ImageButton btnTest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnTest =(ImageButton) findViewById(R.id.imageButton2);
btnTest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(isPressed)
btnTest.setBackgroundResource(R.drawable.img2);
else
btnTest.setBackgroundResource(R.drawable.img3);
isPressed = !isPressed;
}
});
}
我希望图像在每次单击时在播放和暂停之间切换。我应该怎么做才能获得这种行为?尝试用setImageResource(int Res_id)代替setBackgroundResource。告诉我它是否有效。试试这个
public class MainActivity extends Activity {
private ImageButton btnTest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnTest =(ImageButton) findViewById(R.id.imageButton2);
btnTest.setImageResource(R.drawable.default_image); // button not clicked
btnTest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
btnTest.setImageResource(R.drawable.after_click_image); // after click it will changed
}
});
}