我无法打开活动。在我的第一个活动 (activity_main) 中,我有 3 个按钮。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1">
<TableLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FFFF"
android:id="@+id/root"
>
<TableRow android:layout_margin="0dip"
android:id="@+id/row1">
<Button android:id="@+id/button01"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:hint="@string/buttonText1"
android:layout_marginTop="60dip"
android:layout_marginBottom="15dip"
android:padding="15dip" />
</TableRow>
<TableRow android:layout_margin="0dip"
android:id="@+id/row2">
<Button android:id="@+id/button02"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:hint="@string/buttonText2"
android:padding="15dip" />
</TableRow>
<TableRow android:layout_margin="0dip"
android:id="@+id/row3">
<Button android:id="@+id/button03"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_marginTop="15dip"
android:hint="@string/buttonText3"
android:onClick="browseExercises"
android:padding="15dip" />
</TableRow>
</TableLayout>
</LinearLayout>
我单击第三个按钮,然后我的第二个活动打开,其中包含两个附加按钮。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1">
<TableLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FFFF"
android:id="@+id/root"
>
<TableRow android:layout_margin="0dip"
android:id="@+id/row1">
<Button android:id="@+id/button01"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:hint="@string/alphabetical"
android:layout_marginTop="60dip"
android:layout_marginBottom="15dip"
android:onClick="Alphabetical"
android:padding="15dip" />
</TableRow>
<TableRow android:layout_margin="0dip"
android:id="@+id/row2">
<Button android:id="@+id/button99999"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:hint="@string/group"
android:onClick="muscleGroups"
android:padding="15dip" />
</TableRow>
</TableLayout>
</LinearLayout>
我单击这些按钮中的任何一个,然后我收到一条错误消息,告诉我“不幸的是,Test_Project 已停止”。
我已经为这两个按钮中的每一个创建了一个活动,并且这两个按钮的所有内容都以与我创建第二个活动时完全相同的方式进行编码,该活动打开得很好,并且具有我可以单击而不会导致任何错误的按钮。我想我在这里遗漏了一些基本的东西,就像我创建了太多的活动一样,他们无法回顾我的 MainActivity.java 文件来寻找应该打开下一个活动的方法。这是我的 MainActivity.java 代码:
package com.example.test_project;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.content.Intent;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void browseExercises(View view){
Intent intent = new Intent(this, BrowseExercises.class);
startActivity(intent);
}
public void Alphabetical(View view){
Intent intent = new Intent(this, Alphabetical.class);
startActivity(intent);
}
public void muscleGroups(View view){
Intent intent = new Intent(this, MuscleGroups.class);
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
这是我的清单文件:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test_project"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.test_project.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.test_project.BrowseExercises"
android:label="@string/title_activity_browse_exercises"
>
</activity>
<activity
android:name="com.example.test_project.MuscleGroups"
android:label="@string/title_activity_muscle_groups" >
</activity>
<activity
android:name="com.example.test_project.Alphabetical"
android:label="@string/title_activity_alphabetical" >
</activity>
</application>
</manifest>
还有我的 logcat 文件:
04-20 13:46:57.632: W/dalvikvm(26747): threadid=1: thread exiting with uncaught exception (group=0x40dc42a0)
04-20 13:46:57.639: E/AndroidRuntime(26747): FATAL EXCEPTION: main
04-20 13:46:57.639: E/AndroidRuntime(26747): java.lang.IllegalStateException: Could not find a method muscleGroups(View) in the activity class com.example.test_project.BrowseExercises for onClick handler on view class android.widget.Button with id 'button99999'
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.view.View$1.onClick(View.java:3587)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.view.View.performClick(View.java:4106)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.view.View$PerformClick.run(View.java:17052)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.os.Handler.handleCallback(Handler.java:615)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.os.Handler.dispatchMessage(Handler.java:92)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.os.Looper.loop(Looper.java:137)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.app.ActivityThread.main(ActivityThread.java:5059)
04-20 13:46:57.639: E/AndroidRuntime(26747): at java.lang.reflect.Method.invokeNative(Native Method)
04-20 13:46:57.639: E/AndroidRuntime(26747): at java.lang.reflect.Method.invoke(Method.java:511)
04-20 13:46:57.639: E/AndroidRuntime(26747): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
04-20 13:46:57.639: E/AndroidRuntime(26747): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
04-20 13:46:57.639: E/AndroidRuntime(26747): at dalvik.system.NativeStart.main(Native Method)
04-20 13:46:57.639: E/AndroidRuntime(26747): Caused by: java.lang.NoSuchMethodException: muscleGroups [class android.view.View]
04-20 13:46:57.639: E/AndroidRuntime(26747): at java.lang.Class.getConstructorOrMethod(Class.java:460)
04-20 13:46:57.639: E/AndroidRuntime(26747): at java.lang.Class.getMethod(Class.java:915)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.view.View$1.onClick(View.java:3580)
04-20 13:46:57.639: E/AndroidRuntime(26747): ... 11 more
04-20 13:46:59.202: I/Process(26747): Sending signal. PID: 26747 SIG: 9
可能是一些非常简单的事情,我只是还不知道,但任何帮助将不胜感激!!!!