如何在fling中更改imageview中的图像

2 回答

• 0

  更好的是你可以使用view pager而不是imageview

  <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >
  
  <android.support.v4.view.ViewPager
      android:id="@+id/myfivepanelpager"
      android:layout_width="match_parent"
      android:layout_height="match_parent" />
  
    </LinearLayout>
  

  ViewPagerAdapter.java

  import android.app.Activity;
          import android.os.Parcelable;
         import android.support.v4.view.PagerAdapter;
        import android.support.v4.view.ViewPager;
       import android.view.View;
          import android.view.ViewGroup.LayoutParams;
       import android.widget.ImageView;
       import android.widget.ImageView.ScaleType;
  
        public class ViewPagerAdapter extends PagerAdapter {
  
        Activity activity;
        int imageArray[];
  
        public ViewPagerAdapter(Activity act, int[] imgArra) {
        imageArray = imgArra;
        activity = act;
         }
  
           public int getCount() {
           return imageArray.length;
           }
  
          public Object instantiateItem(View collection, int position) {
            ImageView view = new ImageView(activity);
           view.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
           LayoutParams.FILL_PARENT));
           view.setScaleType(ScaleType.FIT_XY);
           view.setBackgroundResource(imageArray[position]);
            ((ViewPager) collection).addView(view, 0);
            return view;
            }
  
            @Override
             public void destroyItem(View arg0, int arg1, Object arg2) {
            ((ViewPager) arg0).removeView((View) arg2);
             }
  
             @Override
              public boolean isViewFromObject(View arg0, Object arg1) {
              return arg0 == ((View) arg1);
             }
  
             @Override
           public Parcelable saveState() {
             return null;
             }
             }
  

  PageIndicatorActivity.java

  public class PageIndicatorActivity extends Activity {
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ViewPagerAdapter adapter = new ViewPagerAdapter(this, imageArra);
    ViewPager myPager = (ViewPager) findViewById(R.id.myfivepanelpager);
    myPager.setAdapter(adapter);
    myPager.setCurrentItem(0);
    }
  
     private int imageArra[] = { R.drawable.antartica1, R.drawable.antartica2,
     R.drawable.antartica3, R.drawable.antartica4,
     R.drawable.antartica5, R.drawable.antartica6,
     R.drawable.antartica7, R.drawable.antartica8 };
  
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
     getMenuInflater().inflate(R.menu.activity_main, menu);
     return true;
     }
  
      }
  
        public int getCount() {
        return imageArray.length;
          }
  
       public Object instantiateItem(View collection, int position) {
       ImageView view = new ImageView(activity);
       view.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
       LayoutParams.FILL_PARENT));
       view.setScaleType(ScaleType.FIT_XY);
       view.setBackgroundResource(imageArray[position]);
        ((ViewPager) collection).addView(view, 0);
         return view;
          }
  
        @Override
       public void destroyItem(View arg0, int arg1, Object arg2) {
      ((ViewPager) arg0).removeView((View) arg2);
      }
  
         @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
         return arg0 == ((View) arg1);
        }
  
         @Override
       public Parcelable saveState() {
        return null;
       }
      }
  

  回复于 2024-05-03T14:54:22+08:00
• 0

  这可以通过 ViewFlipper 完成，如下所述 .

  这是你的 Activity.xml 文件

  <ViewFlipper xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:id="@+id/view_flipper"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".HowToUseActivity" >
      <ImageView
          android:id="@+id/imageHowToUse"
          android:contentDescription="@string/app_name"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:src="@mipmap/screen_1" />
  </ViewFlipper>
  

  在您的活动类中声明所需的变量

  private int number = 0;
  private float initialX;
  private ImageView imageView;
  

  在 Activity 的 onCreate(...) 方法中检索 ImageView

  imageView = (ImageView) findViewById(R.id.imageHowToUse);
  

  覆盖同一活动中的方法 onTouchEvent(...)

  @Override
  public boolean onTouchEvent(MotionEvent event) {
      switch(event.getAction()) {
          case MotionEvent.ACTION_DOWN:
              initialX = event.getX();
              break;
          case MotionEvent.ACTION_UP:
              float finalX = event.getX();
              if (initialX > finalX) {
                  if (number >= 3) {
                      break;
                  }
                  next();
              } else {
                  if(number <= 0) {
                      break;
                  }
                  previous();
              }
              break;
      }
      return false;
  }
  
  private void next() {
      number++;
      imageView.setImageResource(getImage());
  }
  
  private void previous() {
      number--;
      imageView.setImageResource(getImage());
  }
  

  然后编写方法 getImage() 以获取要显示的下一个图像

  private int getImage() {
      int resource = R.mipmap.screen_1;
      switch(number) {
          case 0:
              resource = R.mipmap.screen_1;
          break;
          case 1:
              resource = R.mipmap.screen_2;
              break;
          case 2:
              resource = R.mipmap.screen_3;
              break;
      }
      return resource;
  }
  

  这是我项目中的工作代码 . 它会帮助你 .

  NOTE : R.mipmap.screen_ is the image resource present in my resource directory.*

  回复于 2024-05-03T14:54:22+08:00