我曾经通过拖动触摸屏尝试了切换屏幕的代码..但是它给出了一个错误...任何人都可以检查我在代码中做了什么错误...并且出现错误
vf.setInAnimation(AnimationUtils.loadAnimation(此, R.anim.push_left_in)); vf.setInAnimation(AnimationUtils.loadAnimation(这一点, R.anim.push_left_out));
.xml文件的代码
<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"
android:background="#ffffff">
<TextView android:id="@+id/tv_country"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textStyle="bold"
android:textSize="18px"
android:text="Country" >
</TextView>
<Spinner android:text=""
android:id="@+id/spinner_country"
android:layout_width="200px"
android:layout_height="55px">
</Spinner>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff">
<TextView android:id="@+id/tv_income"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textStyle="bold"
android:textSize="18px"
android:text="Income" >
</TextView>
<EditText android:text=""
android:id="@+id/et_income"
android:layout_width="200px"
android:layout_height="55px">
</EditText>
</LinearLayout>
</ViewFlipper>
<。pv文件的代码
package com.examples.switchactivtybydragging;
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.*;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.ViewFlipper;
public class SwitchActivityByDraggingActivity extends Activity implements OnTouchListener {
/** Called when the activity is first created. */
private float downXValue;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout layMain = (LinearLayout) findViewById(R.id.layout_main);
layMain.setOnTouchListener((OnTouchListener) this);
Spinner spinnerCountries = (Spinner) findViewById(R.id.spinner_country);
@SuppressWarnings({ "unchecked", "rawtypes" })
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;
}
}
答案 0 :(得分:2)
您的问题是您尚未创建动画。要使代码生效,您需要res/anim/push_left_in.xml
和res/anim/push_left_out.xml
中的动画。缺少这些文件会导致您的错误。
我撰写了一篇关于Simple Animations的博客系列文章,可以帮助您了解如何创建这些文件,以及您需要将这些文件放入其中。