如何在安卓中实现每隔5秒更换图片。

huangapple
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标题翻译

How can I change image after every 5 second in Android

问题

  1. public class MainActivity extends AppCompatActivity {
  3.     private ImageView im_car;
  4.     private Handler mHandler = new Handler();
  5.     public static Integer[] mThumbeId = {R.drawable.first, R.drawable.second, R.drawable.thard};
  6.     public int i = 0, id = 0;
  7.     private String KEY_ID = "key_id";
  9.     @SuppressLint("ClickableViewAccessibility")
  10.     @Override
  11.     protected void onCreate(Bundle savedInstanceState) {
  12.         super.onCreate(savedInstanceState);
  13.         setContentView(R.layout.activity_main);
  15.         im_car = findViewById(R.id.im_car);
  17.         mThumbRun.run();
  18.         if (savedInstanceState != null) {
  19.             i = savedInstanceState.getInt(KEY_ID);
  20.         }
  21.         im_car.setOnTouchListener(new View.OnTouchListener() {
  22.             @Override
  23.             public boolean onTouch(View v, MotionEvent event) {
  24.                 switch (event.getAction()) {
  25.                     case MotionEvent.ACTION_DOWN:
  26.                         mHandler.removeCallbacks(mThumbRun);
  27.                         break;
  28.                     case MotionEvent.ACTION_UP:
  29.                         if (i!=0)
  30.                         {
  31.                             i = i-1;
  32.                         }
  33.                         else i=2;
  34.                         mThumbRun.run();
  35.                         break;
  36.                 }
  37.                 return false;
  38.             }
  39.         });
  41.     }
  43.     @Override
  44.     protected void onRestart() {
  45.         super.onRestart();
  46.         if (i!=0)
  47.         {
  48.             i = i-1;
  49.         }
  50.         else i=2;
  51.         mThumbRun.run();
  52.     }
  54.     Runnable mThumbRun = new Runnable() {
  55.         @Override
  56.         public void run() {
  57.             im_car.setImageResource(mThumbeId[i]);
  58.             i++;
  59.             if (i >= mThumbeId.length) {
  60.                 i = 0;
  61.             }
  62.             mHandler.postDelayed(this, 5000);
  63.         }
  64.     };
  65. }
英文翻译

I need to change image every 5 seconds, then when we touch the ImageView it will stop changing until we release the touch.
When the application go to OnPause state it pauses the auto changing of the image.

I save the KEY_ID and stop the runnable in onSaveInstanceState

How can I make this change automatically ? Below is my code in java.

  1. public class MainActivity extends AppCompatActivity {
  3.     private ImageView im_car;
  4.     private Handler mHandler = new Handler();
  5.     public static Integer[] mThumbeId = {R.drawable.first, R.drawable.second, R.drawable.thard};
  6.     public int i = 0, id = 0;
  7.     private String KEY_ID = "key_id";
  9.     @SuppressLint("ClickableViewAccessibility")
  10.     @Override
  11.     protected void onCreate(Bundle savedInstanceState) {
  12.         super.onCreate(savedInstanceState);
  13.         setContentView(R.layout.activity_main);
  15.         im_car = findViewById(R.id.im_car);
  17.         mThumbRun.run();
  18.         if (savedInstanceState != null) {
  19.             i = savedInstanceState.getInt(KEY_ID);
  20.         }
  21.         im_car.setOnTouchListener(new View.OnTouchListener() {
  22.             @Override
  23.             public boolean onTouch(View v, MotionEvent event) {
  24.                 switch (event.getAction()) {
  25.                     case MotionEvent.ACTION_DOWN:
  26.                         mHandler.removeCallbacks(mThumbRun);
  27.                         break;
  28.                     case MotionEvent.ACTION_UP:
  29.                         if (i!=0)
  30.                         {
  31.                             i = i-1;
  32.                         }
  33.                         else i=2;
  34.                         mThumbRun.run();
  35.                         break;
  36.                 }
  37.                 return false;
  38.             }
  39.         });
  41.     }
  43.     @Override
  44.     protected void onRestart() {
  45.         super.onRestart();
  46.         if (i!=0)
  47.         {
  48.             i = i-1;
  49.         }
  50.         else i=2;
  51.         mThumbRun.run();
  52.     }
  54.     Runnable mThumbRun = new Runnable() {
  55.         @Override
  56.         public void run() {
  57.             im_car.setImageResource(mThumbeId[i]);
  58.             i++;
  59.             if (i >= mThumbeId.length) {
  60.                 i = 0;
  61.             }
  62.             mHandler.postDelayed(this, 5000);
  63.         }
  64.     };
  65. }

答案1

得分: 0

你可以在你的ImageView上创建一个触摸监听器。

保持一个布尔值来检查图像是否应该改变。

  1. boolean imageChangePermission = true;
  3. yourImageView.setOnTouchListener(new OnTouchListener () {
  4.   public boolean onTouch(View view, MotionEvent event) {
  6.     if (event.getAction() == android.view.MotionEvent.ACTION_DOWN) {
  7.       Log.d("TouchTest", "Touch down");
  8.     } 
  9.     else if (event.getAction() == android.view.MotionEvent.ACTION_UP) {
  10.       Log.d("TouchTest", "Touch up");
  11.       imageChangePermission = false;
  12.     }
  13.   }
  14. }

ACTION_DOWN - 当你第一次触摸时

ACTION_MOVE - 当你在屏幕上移动手指时

ACTION_UP - 当你从屏幕上移开手指时

创建一个Handler来定期调用你的changeImage方法。

  1. Handler handler = new Handler();
  2. handler.postDelayed(new Runnable() {
  3.     @Override
  4.     public void run() {
  5.         if(imageChangePermission) {
  6.             changeImage();
  7.         }
  8.     }
  9. }, 5000); //每5秒后执行一次
英文翻译

You can create a touch listener in your imageview.

Keep a boolean to check wether image should change.

  1. boolean imageChangePermission = true;
  4. yourImageView.setOnTouchListener(new OnTouchListener () {
  5.   public boolean onTouch(View view, MotionEvent event) {
  7.     if (event.getAction() == android.view.MotionEvent.ACTION_DOWN) {
  8.       Log.d("TouchTest", "Touch down");
  9.     } 
  10.     else if (event.getAction() == android.view.MotionEvent.ACTION_UP) {
  11.       Log.d("TouchTest", "Touch up");
  12.       imageChangePermission = false;
  13.     }
  14.   }
  15. }

ACTION_DOWN - when you first touch

ACTION_MOVE - when you are moving your finger on screen

ACTION_UP - when you remove your finger from screen

Create a Handler to periodically call the change Image method of yours.

  1.     Handler handler = new Handler();
  2.     handler.postDelayed(new Runnable() {
  3.         @Override
  4.         public void run() {
  5.             if(imageChangePermission) {
  6.                 changeImage();
  7.             }
  8.         }
  9.     },5000); //Run after every 5 second

huangapple
  • 本文由 发表于 2020年3月16日 20:17:00
  • 转载请务必保留本文链接：https://java.coder-hub.com/60705873.html
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