如何每n秒更改一次imageview中的图像 [英] How to change images in imageview every n number of seconds

问题描述

我已经创建了一个包含int中所有图像的数组，我想在imageView中每隔3秒更改一次这些图像，我已经尝试了所有可以找到的解决方案，但是显示出一些错误，我无法理解出去

I have made an array that has all the images in int and i want to change those images every 3 seconds in the imageView, I have tries all the solutions I could find but was showing some error, I can't figure it out .

java文件（home.java）

java file (home.java)

/**
* Created by sukhvir on 17/04/2015.
*/
public class home extends android.support.v4.app.Fragment {

    ImageView MyImageView;
    int[] imageArray = { R.drawable.image1, R.drawable.image2, R.drawable.image3, R.drawable.image4, R.drawable.image5 };

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /**
         * Inflate the layout for this fragment
        */
        return inflater.inflate(R.layout.home, container, false);
    }
}

xml文件（home.xml）

xml file(home.xml)

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

推荐答案

实现您的要求的最佳选择是您应该使用< a href =http://developer.android.com/reference/java/util/Timer.html =nofollow> 计时器 要更改每次3秒的图像如下。

Best option to achieve your requirement is You should use Timer to change Image each of 3 seconds as follows.

// Declare globally
private int position = -1;

/**
 * This timer will call each of the seconds.
 */
Timer mTimer = new Timer();
mTimer.schedule(new TimerTask() {
    @Override
    public void run() {
        // As timer is not a Main/UI thread need to do all UI task on runOnUiThread
        getActivity().runOnUiThread(new Runnable() {
            @Override
            public void run() {
                    // increase your position so new image will show
                position++;
                // check whether position increased to length then set it to 0
                // so it will show images in circuler
                if (position >= imageArray.length)
                    position = 0;
                // Set Image
                MyImageView.setImageResource(imageArray[position]);
            }
        });
    }
}, 0, 3000);
// where 0 is for start now and 3000 (3 second) is for interval to change image as you mentioned in question

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