我的活动有三个按钮，每个按钮分别导致三个活动。前两个按钮工作正常，但点击第三个按钮，应用程序崩溃。 gradle完美同步。清单已更新。有人可以指出如何排序这个问题。
活动
package com.kiginfotech.choiceofemperor;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
/**
* Created by kishore on 01-Jun-17.
*/
public class Choice03 extends MainActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.choice03);
Button button10 = (Button) findViewById(R.id.bt10);
Button button11 = (Button) findViewById(R.id.bt11);
Button button12 = (Button) findViewById(R.id.bt12);
button10.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent intent10 = new Intent(Choice03.this,choice1103.class);
startActivity(intent10);
finish();
}
});
button11.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent intent11 = new Intent(Choice03.this,Choice1203.class);
startActivity(intent11);
finish();
}
});
button12.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent intent12 = new Intent(Choice03.this,Choice1303.class);
startActivity(intent12);
finish();
}
});
}
}
Xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<ScrollView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:fillViewport="true"
android:scrollbars="vertical"
tools:ignore="UselessParent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginEnd="20dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginStart="20dp"
android:layout_marginTop="20dp"
android:text="@string/choice_03_content"
android:textSize="20sp"
/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@android:color/black" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<Button
android:id="@+id/bt10"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/background_light"
android:text="@string/choice_1_1"
android:textSize="20sp"/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@android:color/black" />
<Button
android:id="@+id/bt11"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/background_light"
android:text="@string/choice_1_2"
android:textSize="20sp"
/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@android:color/black" />
<Button
android:id="@+id/bt12"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/background_light"
android:text="@string/choice_1_3"
android:textSize="20sp"
/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@android:color/black" />
</LinearLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
目标活动
package com.kiginfotech.choiceofemperor;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
/**
* Created by kishore on 07-Jun-17.
*/
public class Choice1303 extends MainActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.choice1303);
Button button19 = (Button) findViewById(R.id.bt19);
Button button20 = (Button) findViewById(R.id.bt20);
Button button21 = (Button) findViewById(R.id.bt15);
button19.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent intent13 = new Intent(Choice1303.this,Choicedeffr1303.class);
startActivity(intent13);
finish();
}
});
button20.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent intent20 = new Intent(Choice1303.this,Choiceecofr1303.class);
startActivity(intent20);
finish();
}
});
button21.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent intent21 = new Intent(Choice1303.this,Choiceadmfr1303.class);
startActivity(intent21);
finish();
}
});
}
}
清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.kiginfotech.choiceofemperor">
<!-- Include required permissions for Google Mobile Ads to run. -->
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="com.android.vending.BILLING"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher1"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:largeHeap="true"
android:fullBackupContent="@xml/backup_descriptor"
tools:ignore="GoogleAppIndexingWarning">
<activity
android:name="com.kiginfotech.choiceofemperor.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=".Choice01"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".Choiceadmfr1202"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".Choice02"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".Choice03"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".choice11"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".Choice12"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".Choice13"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".Choice1303"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".choice1102"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name=".choice1103"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
</application>
</manifest>
这是logcat。
07-26 18:30:41.652 13842-13842/com.kiginfotech.choiceofemperor D/OpenGLRenderer: drawRect multiDraw AppCompatButton @42251360 paint 0x61f2b268 id 5 style 0 AA 0 color 0xffffffff
07-26 18:30:41.653 13842-13842/com.kiginfotech.choiceofemperor D/OpenGLRenderer: finish <0x617463a8>
07-26 18:30:44.508 13842-13842/com.kiginfotech.choiceofemperor I/View: Touch down dispatch to android.support.v7.widget.AppCompatButton{422526a0 VFED..C. ........ 0,196-656,344 #7f0c0062 app:id/bt12}, event = MotionEvent { action=ACTION_DOWN, id[0]=0, x[0]=326.50208, y[0]=58.171753, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=16574142, downTime=16574142, deviceId=2, source=0x1002 }
07-26 18:30:44.662 13842-13842/com.kiginfotech.choiceofemperor I/View: Touch up dispatch to android.support.v7.widget.AppCompatButton{422526a0 VFED..C. ...p.... 0,196-656,344 #7f0c0062 app:id/bt12}, event = MotionEvent { action=ACTION_UP, id[0]=0, x[0]=326.50208, y[0]=58.171753, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=16574293, downTime=16574142, deviceId=2, source=0x1002 }
07-26 18:30:44.663 13842-13842/com.kiginfotech.choiceofemperor V/Provider/Settings: from settings cache , name = sound_effects_enabled , value = 0
07-26 18:30:44.681 13842-13842/com.kiginfotech.choiceofemperor D/ActivityThread: ACT-AM_ON_PAUSE_CALLED ActivityRecord{4223c838 token=android.os.BinderProxy@4223be98 {com.kiginfotech.choiceofemperor/com.kiginfotech.choiceofemperor.Choice03}}
07-26 18:30:44.687 13842-13842/com.kiginfotech.choiceofemperor D/ActivityThread: ACT-PAUSE_ACTIVITY handled : 1 / android.os.BinderProxy@4223be98
07-26 18:30:44.931 13842-13842/com.kiginfotech.choiceofemperor D/AndroidRuntime: Shutting down VM
07-26 18:30:44.931 13842-13842/com.kiginfotech.choiceofemperor W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x4193fcf8)
07-26 18:30:44.931 13842-13842/com.kiginfotech.choiceofemperor W/dalvikvm: threadid=1: uncaught exception occurred
07-26 18:30:44.931 13842-13842/com.kiginfotech.choiceofemperor W/System.err: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kiginfotech.choiceofemperor/com.kiginfotech.choiceofemperor.Choice1303}: java.lang.NullPointerException
07-26 18:30:44.932 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2367)
07-26 18:30:44.932 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2419)
07-26 18:30:44.933 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.app.ActivityThread.access$800(ActivityThread.java:151)
07-26 18:30:44.933 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
07-26 18:30:44.933 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.os.Handler.dispatchMessage(Handler.java:110)
07-26 18:30:44.933 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.os.Looper.loop(Looper.java:193)
07-26 18:30:44.933 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5323)
07-26 18:30:44.933 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
07-26 18:30:44.933 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
07-26 18:30:44.933 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
07-26 18:30:44.934 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
07-26 18:30:44.934 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at dalvik.system.NativeStart.main(Native Method)
07-26 18:30:44.934 13842-13842/com.kiginfotech.choiceofemperor W/System.err: Caused by: java.lang.NullPointerException
07-26 18:30:45.039 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at com.kiginfotech.choiceofemperor.Choice1303.onCreate(Choice1303.java:43)
07-26 18:30:45.040 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.app.Activity.performCreate(Activity.java:5343)
07-26 18:30:45.040 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
07-26 18:30:45.040 13842-13842/com.kiginfotech.choiceofemperor W/System.err: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331)
07-26 18:30:45.040 13842-13842/com.kiginfotech.choiceofemperor W/System.err: ... 11 more
07-26 18:30:45.040 13842-13842/com.kiginfotech.choiceofemperor W/dalvikvm: threadid=1: calling UncaughtExceptionHandler
07-26 18:30:45.055 13842-13842/com.kiginfotech.choiceofemperor E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.kiginfotech.choiceofemperor, PID: 13842
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kiginfotech.choiceofemperor/com.kiginfotech.choiceofemperor.Choice1303}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2367)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2419)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5323)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.kiginfotech.choiceofemperor.Choice1303.onCreate(Choice1303.java:43)
at android.app.Activity.performCreate(Activity.java:5343)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2419)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5323)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
将ID添加到此按钮15 ....您正在引用Button21的按钮R.id.bt15
<Button
android:id="@+id/bt15"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/background_light"
android:text="@string/improve_administration"
android:textSize="20sp"
/>
答案 1 :(得分：0)
目标XML中不存在ID为15的按钮。
你应该给bt20下面的按钮id bt21：
<Button
android:id="@+id/bt21"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/background_light"
android:text="@string/improve_administration"
android:textSize="20sp"/>
并替换以下
Button button21 = (Button) findViewById(R.id.bt15);
与
Button button21 = (Button) findViewById(R.id.bt21);
答案 2 :(得分：0)
您正在引用两种不同的xml布局
MainActivity：
setContentView(R.layout.choice03);
Choice1303：
setContentView(R.layout.choice1303);
您需要确保使用相同的xml文件或在两个xml文件中使用相同的元素ID。