[英]I would need to Set setImageResource, pause and change to different setImageResource
我试图设置图像并将其稍作停顿(例如闪烁)后将其更改为其他图像; 并且它应该在应用启动后自动启动。
public class MainActivity extends ActionBarActivity {
ImageView image1;
private void flash(){
Thread flashing=new Thread(){
public void run(){
try {
image1.setImageResource(R.drawable.red_circle);
sleep(1000);
image1.setImageResource(R.drawable.white_circle);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
flashing.start();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
image1=(ImageView)findViewById(R.id.imageView1);
flash();
}
}这会导致错误和应用程序停止。
试试这个:
ImageView slide;
private Handler handler;
private int showPic = -1;// default value should be -1
Integer[] ids = new Integer[] { R.drawable.red_circle, R.drawable.white_circle};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.slide_show);
slide = (ImageView) findViewById(R.id.slide);
handler = new Handler();
handler.postDelayed(imageUpdate, 10);
}
private void setNextImage() {
showPic++;
if (showPic == ids.length) {
showPic = -1;
handler.removeCallbacks(imageUpdate);
} else {
slide.setImageResource(ids[showPic]);
handler.postDelayed(imageUpdate, 1000);
}
}
Runnable imageUpdate= new Runnable() {
@Override
public void run() {
setNextImage();
}
};
更新:如果要在图像上循环,可以将setNextImage()
方法更改为此,还要注意,我将showPic的默认值更改为-1(如果要循环,则默认值应为-1):
private void setNextImage() {
showPic++;
if (showPic == ids.length) {
showPic = 0;
}
slide.setImageResource(ids[showPic]);
handler.postDelayed(imageUpdate, 1000);
}
在onDestroy()
方法中删除callBack:
public void onDestroy(){
handler.removeCallback(imageUpdate);
super.onDestroy();
}
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