我正在开发一个应用程序,我在其中使用带有自定义 OnTouch
实现的 ViewFlipper
。在 ViewFlipper
中,我有大约 20 张图片供用户浏览。这工作正常,但如果我在系列中的第 20 张图片并翻转屏幕,它会返回到第一张图片。
我想阻止 ViewFlipper
循环回到第一张图片。相反,它应该简单地停在最后一张图片上。
这是我的代码:
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.animation.AnimationUtils;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.ViewFlipper;
public class Activity1 extends Activity implements OnTouchListener{
float downXValue;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set main.XML as the layout for this Activity
setContentView(R.layout.main);
// Add these two lines
LinearLayout layMain = (LinearLayout) findViewById(R.id.layout_main);
layMain.setOnTouchListener((OnTouchListener) this);
// Add a few countries to the spinner
Spinner spinnerCountries = (Spinner) findViewById(R.id.spinner_country);
ArrayAdapter countryArrayAdapter = new ArrayAdapter(this,
android.R.layout.simple_spinner_dropdown_item,
new String[] { "Canada", "USA" });
spinnerCountries.setAdapter(countryArrayAdapter);
}
public boolean onTouch(View arg0, MotionEvent arg1) {
// Get the action that was done on this touch event
switch (arg1.getAction())
{
case MotionEvent.ACTION_DOWN:
{
// store the X value when the user's finger was pressed down
downXValue = arg1.getX();
break;
}
case MotionEvent.ACTION_UP:
{
// Get the X value when the user released his/her finger
float currentX = arg1.getX();
// going backwards: pushing stuff to the right
if (downXValue < currentX)
{
// Get a reference to the ViewFlipper
ViewFlipper vf = (ViewFlipper) findViewById(R.id.details);
// Set the animation
vf.setAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));
// Flip!
vf.showPrevious();
}
// going forwards: pushing stuff to the left
if (downXValue > currentX)
{
// Get a reference to the ViewFlipper
ViewFlipper vf = (ViewFlipper) findViewById(R.id.details);
// Set the animation
vf.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));
// Flip!
vf.showNext();
}
break;
}
}
// if you return false, these actions will not be recorded
return true;
}
}
和 XML 布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/layout_main"
>
<ViewFlipper android:id="@+id/details"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/two"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/three"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/four"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/five"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/six"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/seven"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView android:id="@+id/ImageView01" android:background="@drawable/eight"
android:layout_x="1dip" android:layout_y="1dip"
android:layout_height="fill_parent" android:layout_width="fill_parent"></ImageView>
</LinearLayout>
<ViewFlipper>
</LinearLayout>
最佳答案
您知道取景器中有 20 个 child 。因此,在 onclick 中创建一个 if 语句来检查 getDisplayedChild()
是否低于 20。如果它是 20 或更高,那么就不要调用 showNext()
.
关于android - 如何防止ViewFlipper循环,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6354180/