尝试从imagebutton启动新活动，但我的应用程序停止在模拟器中工作 [英] Trying to launch a new activity from imagebutton but my app stops working in emulator
本文介绍了尝试从imagebutton启动新活动，但我的应用程序停止在模拟器中工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是android开发的新手.我要实现的目标是，当用户单击图像按钮时，它将启动一个新活动，该活动是具有新xml布局的新类.一切都可以正常编译，没有错误，但是当我在模拟器中启动该程序(在实现此功能之前曾工作过)时，该应用程序停止运行.我尝试再次编写所有代码，但仍然遇到相同的问题.我想念的是什么.这是我涉及的所有五个文件的代码.
I am new to android development. What I'm trying to achieve is when a user clicks an image button it launches a new activity which is a new class with a new xml layout. Everything compiles fine with no errors however when I launch it in my emulator (Which worked before implementing this) the app stops. I have tried to code it all again but am still getting the same problem. What am I missing. Here is my code for all five files involved.
MainMenu类
package com.example.james.card_app;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
public class MainMenu extends AppCompatActivity {
private static Button button_sbm;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_menu);
onClickButtonListener();
}
public void onClickButtonListener(){
Button btn = (Button)findViewById(R.id.playbutton);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainMenu.this, MenuSearch.class));
}
});
}
}
SearchMenu类
SearchMenu Class
package com.example.james.card_app;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MenuSearch extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
}
}
Android清单xml
Android Manifest xml
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity android:name=".MainMenu" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MenuSearch" >
<intent-filter>
<action android:name="com.example.james.card_app.MenuSearch" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
MainMenu xml
MainMenu xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainMenu"
android:background="#1A6600">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/AppTitle"
android:textColor="#FFFFFF"
android:textSize="60dp"
android:id="@+id/textView"
android:layout_alignTop="@+id/imageView"
android:layout_alignParentLeft="true"
android:layout_marginTop="22dp" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/playbutton"
android:src="@drawable/playbutton"
android:layout_marginRight="120dp"
android:layout_marginEnd="120dp"
android:background="@null"
android:layout_above="@+id/imageButton2"
android:layout_toLeftOf="@+id/imageView"
android:layout_toStartOf="@+id/imageView" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView"
android:src="@drawable/applogo"
android:paddingBottom="200dp"
android:layout_alignParentBottom="true"
android:layout_toRightOf="@+id/textView"
android:layout_toEndOf="@+id/textView"
android:contentDescription="logoimage" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageButton2"
android:src="@drawable/settings"
android:contentDescription="@string/settingsbutton"
android:layout_alignParentBottom="true"
android:layout_alignRight="@+id/imageView"
android:layout_alignEnd="@+id/imageView"
android:background="@null"/>
</RelativeLayout>
搜索菜单xml
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/settingtitle"
android:id="@+id/textView2"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="121dp"
android:layout_marginStart="121dp"
android:layout_marginTop="24dp" />
</RelativeLayout>
Logcat错误
01-05 10:57:57.928 4316-4316/? D/dalvikvm: Not late-enabling CheckJNI (already on)
01-05 10:57:57.998 4316-4316/com.example.james.card_app E/Trace: error opening trace file: No such file or directory (2)
01-05 10:57:58.038 4316-4316/com.example.james.card_app W/dalvikvm: VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
01-05 10:57:58.038 4316-4316/com.example.james.card_app I/dalvikvm: Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onSearchRequested
01-05 10:57:58.038 4316-4316/com.example.james.card_app W/dalvikvm: VFY: unable to resolve interface method 17897: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
01-05 10:57:58.038 4316-4316/com.example.james.card_app D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
01-05 10:57:58.038 4316-4316/com.example.james.card_app I/dalvikvm: Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onWindowStartingActionMode
01-05 10:57:58.038 4316-4316/com.example.james.card_app W/dalvikvm: VFY: unable to resolve interface method 17901: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
01-05 10:57:58.038 4316-4316/com.example.james.card_app D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
01-05 10:57:58.178 4316-4316/com.example.james.card_app I/dalvikvm: Could not find method android.view.ViewGroup.onRtlPropertiesChanged, referenced from method android.support.v7.widget.Toolbar.onRtlPropertiesChanged
01-05 10:57:58.178 4316-4316/com.example.james.card_app W/dalvikvm: VFY: unable to resolve virtual method 17793: Landroid/view/ViewGroup;.onRtlPropertiesChanged (I)V
01-05 10:57:58.188 4316-4316/com.example.james.card_app D/dalvikvm: VFY: replacing opcode 0x6f at 0x0007
01-05 10:57:58.188 4316-4316/com.example.james.card_app I/dalvikvm: Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
01-05 10:57:58.188 4316-4316/com.example.james.card_app W/dalvikvm: VFY: unable to resolve virtual method 422: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
01-05 10:57:58.188 4316-4316/com.example.james.card_app D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
01-05 10:57:58.188 4316-4316/com.example.james.card_app I/dalvikvm: Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
01-05 10:57:58.188 4316-4316/com.example.james.card_app W/dalvikvm: VFY: unable to resolve virtual method 444: Landroid/content/res/TypedArray;.getType (I)I
01-05 10:57:58.188 4316-4316/com.example.james.card_app D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
01-05 10:57:58.248 4316-4321/com.example.james.card_app D/dalvikvm: GC_CONCURRENT freed 171K, 2% free 18879K/19207K, paused 19ms+0ms, total 24ms
01-05 10:57:58.258 4316-4316/com.example.james.card_app D/dalvikvm: GC_FOR_ALLOC freed 16K, 2% free 18928K/19271K, paused 2ms, total 3ms
01-05 10:57:58.258 4316-4316/com.example.james.card_app I/dalvikvm-heap: Grow heap (frag case) to 19.043MB for 429168-byte allocation
01-05 10:57:58.268 4316-4316/com.example.james.card_app D/dalvikvm: GC_FOR_ALLOC freed <1K, 2% free 19347K/19719K, paused 9ms, total 9ms
01-05 10:57:58.278 4316-4316/com.example.james.card_app D/dalvikvm: GC_FOR_ALLOC freed 48K, 3% free 19302K/19719K, paused 2ms, total 2ms
01-05 10:57:58.278 4316-4316/com.example.james.card_app I/dalvikvm-heap: Grow heap (frag case) to 19.675MB for 708972-byte allocation
01-05 10:57:58.298 4316-4321/com.example.james.card_app D/dalvikvm: GC_CONCURRENT freed <1K, 3% free 19994K/20423K, paused 12ms+0ms, total 14ms
01-05 10:57:58.298 4316-4316/com.example.james.card_app D/dalvikvm: GC_FOR_ALLOC freed 0K, 3% free 19995K/20423K, paused 3ms, total 3ms
01-05 10:57:58.308 4316-4316/com.example.james.card_app I/dalvikvm-heap: Grow heap (frag case) to 25.760MB for 6380652-byte allocation
01-05 10:57:58.328 4316-4321/com.example.james.card_app D/dalvikvm: GC_CONCURRENT freed 0K, 2% free 26226K/26695K, paused 14ms+1ms, total 18ms
01-05 10:57:58.388 4316-4316/com.example.james.card_app D/AndroidRuntime: Shutting down VM
01-05 10:57:58.388 4316-4316/com.example.james.card_app W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xb2fa8288)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: FATAL EXCEPTION: main
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.james.card_app/com.example.james.card_app.MainMenu}: java.lang.ClassCastException: android.support.v7.widget.AppCompatImageButton cannot be cast to android.widget.Button
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread.access$600(ActivityThread.java:130)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:4745)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: Caused by: java.lang.ClassCastException: android.support.v7.widget.AppCompatImageButton cannot be cast to android.widget.Button
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at com.example.james.card_app.MainMenu.onClickButtonListener(MainMenu.java:20)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at com.example.james.card_app.MainMenu.onCreate(MainMenu.java:16)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:5008)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread.access$600(ActivityThread.java:130)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:4745)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-05 10:57:58.398 4316-4316/com.example.james.card_app E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
01-05 10:58:01.188 4316-4316/? I/Process: Sending signal. PID: 4316 SIG: 9
推荐答案
此行
Button btn = (Button)findViewById(R.id.playbutton);
应为:
ImageButton btn = (ImageButton)findViewById(R.id.playbutton);
此外，由于您使用显式的 Intent 来启动 Activity ，因此您可以删除
Also as you are using explicit Intent to start your Activity, you can delete
<intent-filter>
<action android:name="com.example.james.card_app.MenuSearch" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
从清单中开始，因为您没有将所需的操作添加到 Intent 中，所以就开始了.
from the manifest, since you don't add needed action to the Intent you start.
这篇关于尝试从imagebutton启动新活动，但我的应用程序停止在模拟器中工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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