5

我正在尝试将图像添加到我的应用程序中,但它一直在崩溃,我无法得出结论。

我的应用程序中有多个图像,但添加这一个图像似乎有问题。这是我的 xml (编辑:完整的 xml (这已经改变了原来的布局目的)):

<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>

还有我的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);

日志猫:

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)

谁能弄清楚问题是什么?提前致谢。

4

4 回答 4

4

这两行对我来说看起来有问题:

android:layout_above="@+id/imageTextButton1"
android:layout_alignRight="@+id/imageTextButton2"

“@+id/”表单不会生成新的id值吗?也许你的意思是“@id/”

于 2013-05-10T00:55:01.080 回答
3

在 xml 文件中创建 id 时(使用 @+id/)你只在第一次出现时就这样做,然后你只使用 @id/

所以你的 xml 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>
于 2013-05-10T01:13:50.740 回答
0

引起:java.lang.ClassCastException: android.widget.Button 无法转换为 android.widget.ImageView

您的布局中似乎有一个Button与您的 ID 相同的ImageView

于 2013-05-10T01:06:13.433 回答
0

我刚刚发现添加图像时出现的问题。就我而言,问题是 ScrollView 不能有多个直接子级。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。解决方案是在滚动视图中添加一个布局作为唯一的直接子级,其中将包含我有用的滚动视图内容布局和视图。

于 2017-06-18T19:37:37.273 回答