Android应用程序运行时出现致命异常?
我正在用Android开发一个小应用程序,其中我必须显示图像。我在我的应用程序中有2个图像,但我必须通过手指触摸来移动图像,因此我在应用程序中使用viewflipper,并且我还需要zoomin和zoomout功能 我还为xoom输入和输出创建了3个类。但是,当我运行应用程序时,它将显示第一个图像,并在我触摸和翻转它时进行缩放,它将移动到第二个图像,然后我将其翻转并尝试缩放。我的应用程序将崩溃,并在logcat中给出以下消息Android应用程序运行时出现致命异常?,android,zooming,Android,Zooming,我正在用Android开发一个小应用程序,其中我必须显示图像。我在我的应用程序中有2个图像,但我必须通过手指触摸来移动图像,因此我在应用程序中使用viewflipper,并且我还需要zoomin和zoomout功能 我还为xoom输入和输出创建了3个类。但是,当我运行应用程序时,它将显示第一个图像,并在我触摸和翻转它时进行缩放,它将移动到第二个图像,然后我将其翻转并尝试缩放。我的应用程序将崩溃,并在logcat中给出以下消息 06-17 15:22:17.003: ERROR/AndroidRu
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): FATAL EXCEPTION: main
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): java.lang.ClassCastException: android.widget.LinearLayout
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at org.example.touch.Touch.onTouch(Touch.java:117)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.view.View.dispatchTouchEvent(View.java:3762)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:897)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1671)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.app.Activity.dispatchTouchEvent(Activity.java:2086)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1655)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.view.ViewRoot.handleMessage(ViewRoot.java:1785)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.os.Handler.dispatchMessage(Handler.java:99)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.os.Looper.loop(Looper.java:123)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at android.app.ActivityThread.main(ActivityThread.java:4627)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at java.lang.reflect.Method.invokeNative(Native Method)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at java.lang.reflect.Method.invoke(Method.java:521)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-17 15:22:17.003: ERROR/AndroidRuntime(6770): at dalvik.system.NativeStart.main(Native Method)
这是我的java代码
/***
* Excerpted from "Hello, Android! 3e",
* published by The Pragmatic Bookshelf.
* Copyrights apply to this code. It may not be used to create training material,
* courses, books, articles, and the like. Contact us if you are in doubt.
* We make no guarantees that this code is fit for any purpose.
* Visit http://www.pragmaticprogrammer.com/titles/eband3 for more book information.
***/
package org.example.touch;
import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ViewFlipper;
public class Touch extends Activity implements OnTouchListener {
private static final String TAG = "Touch";
// These matrices will be used to move and zoom image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
float downXValue;
int counter = 0;
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView view = (ImageView) findViewById(R.id.imageView);
ImageView view1 = (ImageView) findViewById(R.id.imageView1);
view.setOnTouchListener(this);
LinearLayout layMain = (LinearLayout) findViewById(R.id.layout_main);
layMain.setOnTouchListener((OnTouchListener) this);
// ...
// Work around a Cupcake bug
matrix.setTranslate(1f, 1f);
view.setImageMatrix(matrix);
view1.setImageMatrix(matrix);
}
@Override
/* 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!
if(counter > 0){
vf.showPrevious();
counter--;
}
}
// 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!
if(counter < 1){
vf.showNext();
counter++;
}
}
break;
}
}
// if you return false, these actions will not be recorded
return true;
}*/
public boolean onTouch(View v, MotionEvent rawEvent) {
WrapMotionEvent event = WrapMotionEvent.wrap(rawEvent);
// ...
ImageView view = (ImageView) v;
// Dump touch event to log
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG");
mode = DRAG;
downXValue = rawEvent.getX();
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_UP:
{
// Get the X value when the user released his/her finger
float currentX = rawEvent.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!
if(counter > 0){
vf.showPrevious();
counter--;
}
}
// 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!
if(counter < 1){
vf.showNext();
counter++;
}
}
}
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
// ...
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x,
event.getY() - start.y);
}
else if (mode == ZOOM) {
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix);
return true; // indicate event was handled
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent(WrapMotionEvent event) {
// ...
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
"POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_").append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN
|| actionCode == MotionEvent.ACTION_POINTER_UP) {
sb.append("(pid ").append(
action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")");
}
sb.append("[");
for (int i = 0; i < event.getPointerCount(); i++) {
sb.append("#").append(i);
sb.append("(pid ").append(event.getPointerId(i));
sb.append(")=").append((int) event.getX(i));
sb.append(",").append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";");
}
sb.append("]");
Log.d(TAG, sb.toString());
}
/** Determine the space between the first two fingers */
private float spacing(WrapMotionEvent event) {
// ...
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
/** Calculate the mid point of the first two fingers */
private void midPoint(PointF point, WrapMotionEvent event) {
// ...
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
}
/***
*摘自“你好,安卓!3e”,
*由实用书架出版。
*版权适用于本代码。不可用于制作培训材料,
*课程、书籍、文章等。如果您有疑问,请联系我们。
*我们不保证此代码适用于任何用途。
*拜访http://www.pragmaticprogrammer.com/titles/eband3 更多图书信息。
***/
包org.example.touch;
导入android.app.Activity;
导入android.graphics.Matrix;
导入android.graphics.PointF;
导入android.os.Bundle;
导入android.util.FloatMath;
导入android.util.Log;
导入android.view.MotionEvent;
导入android.view.view;
导入android.view.view.OnTouchListener;
导入android.widget.ImageView;
导入android.widget.LinearLayout;
导入android.widget.ViewFlipper;
公共类Touch扩展了活动实现OnTouchListener{
私有静态最终字符串TAG=“Touch”;
//这些矩阵将用于移动和缩放图像
矩阵=新矩阵();
矩阵savedMatrix=新矩阵();
//我们可能处于这三种状态之一
静态最终int NONE=0;
静态最终整数阻力=1;
静态最终整数缩放=2;
int模式=无;
浮动下降值;
int计数器=0;
//记住一些关于缩放的事情
PointF start=新的PointF();
PointF mid=新的PointF();
浮动oldDist=1f;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView=(ImageView)findViewById(R.id.ImageView);
ImageView view1=(ImageView)findViewById(R.id.imageView1);
view.setOnTouchListener(这个);
LinearLayout layMain=(LinearLayout)findViewById(R.id.layout_main);
layMain.setOnTouchListener((OnTouchListener)this);
// ...
//对付纸杯蛋糕虫
矩阵.setTranslate(1f,1f);
视图.setImageMatrix(矩阵);
视图1.设置图像矩阵(矩阵);
}
@凌驾
/*公共布尔onTouch(视图arg0、运动事件arg1){
//获取在此触摸事件上执行的操作
开关(arg1.getAction())
{
case MotionEvent.ACTION\u DOWN:
{
//当按下用户的手指时,存储X值
downXValue=arg1.getX();
打破
}
case MotionEvent.ACTION\u UP:
{
//获取用户释放手指时的X值
float currentX=arg1.getX();
//倒退:把东西往右边推
如果(向下X值<当前X)
{
//获取对ViewFlipper的引用
ViewFlipper vf=(ViewFlipper)findViewById(R.id.details);
//设置动画
//setAnimation(AnimationUtils.loadAnimation(this,R.anim.push_left_out));
//翻转!
如果(计数器>0){
vf.showPrevious();
计数器--;
}
}
//向前:把东西推到左边
如果(向下X值>当前X)
{
//获取对ViewFlipper的引用
ViewFlipper vf=(ViewFlipper)findViewById(R.id.details);
//设置动画
//设置动画(AnimationUtils.loadAnimation(这个,R.anim.push_left_in));
//翻转!
如果(计数器<1){
vf.showNext();
计数器++;
}
}
打破
}
}
//如果返回false,则不会记录这些操作
返回true;
}*/
公共布尔onTouch(视图v、MotionEvent和rawEvent){
WrapMotionEvent=WrapMotionEvent.wrap(rawEvent);
// ...
ImageView视图=(ImageView)v;
//将触摸事件转储到日志
dumpEvent(事件);
//在这里处理触摸事件。。。
开关(event.getAction()&MotionEvent.ACTION\u掩码){
case MotionEvent.ACTION\u DOWN:
savedMatrix.set(矩阵);
set(event.getX(),event.getY());
Log.d(标记“mode=DRAG”);
模式=拖动;
downXValue=rawEvent.getX();
打破
case MotionEvent.ACTION\u指针\u向下:
oldDist=间距(事件);
Log.d(标记“oldDist=“+oldDist”);
如果(旧区>10f){
savedMatrix.set(矩阵);
中点(中点,事件);
模式=缩放;
Log.d(标记“mode=ZOOM”);
}
打破
case MotionEvent.ACTION\u UP:
{
//获取用户释放手指时的X值
float currentX=rawEvent.getX();
//倒退:把东西往右边推
如果(向下X值<当前X)
{
//获取对ViewFlipper的引用
ViewFlipper vf=(ViewFlipper)findViewById(R.id.details);
//设置动画
//setAnimation(AnimationUtils.loadAnimation(this,R.anim.push_left_out));
//翻转!
如果(计数器>0){
vf.showPrevious();
计数器--;
LinearLayout layMain = (LinearLayout) findViewById(R.id.layout_main);
layMain.setOnTouchListener((OnTouchListener) this);
if(!(v instanceof ImageView))return false;