如何在fview中更改imageview中的图像
所以我有一个包含图像的相对布局。 我在可绘制文件夹和存储这些图像的HashMap中有10-20张图像。
在从左到右的图像下方滑动时，应该更改为下一张图像。 在每次滑动时，它应该从hashmap转换为下一个图像。
我完全不熟悉java和android编程，并以任何方式提供帮助。
这是我拥有的：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.bschiranth.homework2_chiranthbs.MainActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/alice"
android:onClick="onClick"
android:clickable="true"
android:src="@drawable/alice"/>
<SeekBar
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/zoombar"
android:max="100"
android:progress="50"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"/>
</RelativeLayout>
和我的java：@Override公共布尔onFling（MotionEvent事件1，MotionEvent事件2，浮动velocityX，浮动velocityY）{Log.d（“fling”，“做fling”）;
MovieData movieData = new MovieData();
HashMap hashMap = new HashMap();
for(int i=1;i<movieData.getSize();i++)
{
hashMap = movieData.getItem(i);
}
if(event1.getX()-event2.getX()> SWIPE_MIN_DISTANCE && Math.abs(velocityX)>SWIPE_THRESHOLD_VELOCITY)
{
Toast.makeText(Activity_Control.this,
"its flinging right to left", Toast.LENGTH_SHORT).show();
imageView.setImageResource(R.drawable.avatar);
}
if(event2.getX()-event1.getX()> SWIPE_MIN_DISTANCE && Math.abs(velocityX)>SWIPE_THRESHOLD_VELOCITY)
{
Toast.makeText(Activity_Control.this,
"its flinging left to right", Toast.LENGTH_SHORT).show();
imageView.setImageResource(R.drawable.avengers);
}
return true;
}
最好使用视图分页器而不是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;
}
}
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>
在你的活动类中声明所需的变量
private int number = 0;
private float initialX;
private ImageView imageView;
在你的Activity的onCreate(...)方法中检索ImageView
imageView = (ImageView) findViewById(R.id.imageHowToUse);
在同一活动中重写onTouchEvent(...)方法
@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幅图像
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;
}
这是我的项目中的代码。 它会帮助你。
注意：R.mipmap.screen_ *是我资源目录中的图像资源。
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