我正在尝试将图片添加到我的应用中,但它一直在崩溃,我无法总结原因。
我的应用中有多个图片,但添加这一张图片似乎有问题。这是我的xml(编辑:完整的xml(为了布局目的,这已经改变了原因)):
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/imageTextButton4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/imageTextButton3"
android:layout_alignBottom="@+id/imageTextButton3"
android:layout_alignLeft="@+id/imageTextButton2"
android:layout_alignRight="@+id/imageTextButton2"
android:drawableTop="@drawable/ic_launcher"
android:text="Progress" />
<Button
android:id="@+id/imageTextButton3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/imageTextButton1"
android:layout_alignRight="@+id/imageTextButton1"
android:layout_below="@+id/imageTextButton1"
android:layout_marginTop="85dp"
android:drawableTop="@drawable/ic_launcher"
android:text="Meal Plans" />
<Button
android:id="@+id/imageTextButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="22dp"
android:drawableTop="@drawable/ic_launcher"
android:text="Your Meals" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="42dp"
android:src="@drawable/logo" />
<Button
android:id="@+id/imageTextButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="16dp"
android:drawableTop="@drawable/ic_launcher"
android:text="Meal of the Day" />
</RelativeLayout>
我的java代码(为简洁起见):
package com.example.c3347115app;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.content.Intent;
public class MainActivity extends Activity {
ImageView image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
image = (ImageView) findViewById(R.id.imageView1);
logcat的:
05-10 01:55:30.718: W/dalvikvm(13140): threadid=1: thread exiting with uncaught exception (group=0x40a99228)
05-10 01:55:30.728: E/AndroidRuntime(13140): FATAL EXCEPTION: main
05-10 01:55:30.728: E/AndroidRuntime(13140): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.c3347115app/com.example.c3347115app.MainActivity}: java.lang.ClassCastException: android.widget.Button cannot be cast to android.widget.ImageView
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2205)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2240)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.app.ActivityThread.access$600(ActivityThread.java:139)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.os.Handler.dispatchMessage(Handler.java:99)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.os.Looper.loop(Looper.java:156)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.app.ActivityThread.main(ActivityThread.java:4987)
05-10 01:55:30.728: E/AndroidRuntime(13140): at java.lang.reflect.Method.invokeNative(Native Method)
05-10 01:55:30.728: E/AndroidRuntime(13140): at java.lang.reflect.Method.invoke(Method.java:511)
05-10 01:55:30.728: E/AndroidRuntime(13140): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-10 01:55:30.728: E/AndroidRuntime(13140): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-10 01:55:30.728: E/AndroidRuntime(13140): at dalvik.system.NativeStart.main(Native Method)
05-10 01:55:30.728: E/AndroidRuntime(13140): Caused by: java.lang.ClassCastException: android.widget.Button cannot be cast to android.widget.ImageView
05-10 01:55:30.728: E/AndroidRuntime(13140): at com.example.c3347115app.MainActivity.onCreate(MainActivity.java:22)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.app.Activity.performCreate(Activity.java:4538)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
05-10 01:55:30.728: E/AndroidRuntime(13140): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161)
有人能弄明白问题是什么吗?提前谢谢。
答案 0 :(得分:4)
这两行看起来对我有问题:
android:layout_above="@+id/imageTextButton1"
android:layout_alignRight="@+id/imageTextButton2"
“@ + id /”表单是否会生成新的id值?也许你的意思是“@id /”
答案 1 :(得分:3)
在xml文件中创建id时(使用@ + id /)你只是在第一次出现时才这样做,之后你只使用@id /
所以你的xml看起来应该是这样的
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/imageTextButton4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/imageTextButton3"
android:layout_alignBottom="@id/imageTextButton3"
android:layout_alignLeft="@+id/imageTextButton2"
android:layout_alignRight="@id/imageTextButton2"
android:drawableTop="@drawable/ic_launcher"
android:text="Progress" />
<Button
android:id="@id/imageTextButton3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/imageTextButton1"
android:layout_alignRight="@id/imageTextButton1"
android:layout_below="@id/imageTextButton1"
android:layout_marginTop="85dp"
android:drawableTop="@drawable/ic_launcher"
android:text="Meal Plans" />
<Button
android:id="@id/imageTextButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="22dp"
android:drawableTop="@drawable/ic_launcher"
android:text="Your Meals" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="42dp"
android:src="@drawable/logo" />
<Button
android:id="@id/imageTextButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="16dp"
android:drawableTop="@drawable/ic_launcher"
android:text="Meal of the Day" />
</RelativeLayout>
答案 2 :(得分:0)
引起:java.lang.ClassCastException:android.widget.Button无法强制转换为android.widget.ImageView
您的布局中似乎有Button
,其ID与ImageView
答案 3 :(得分:0)
我刚刚发现添加图像时出错了。在我的例子中,问题是ScrollView不能有多个直接子项。因此,当我将图像并排添加到现有子项时,编译显示没有错误,但运行时应用程序在创建时崩溃。解决方案是在scrollview中添加一个布局作为一个独特的直接子项,其中将包含我有用的scrollview内容布局和视图。