如何解决应用程序因程序中使用的事件侦听器崩溃请告诉我使用事件侦听器的正确方法是什么
由于程序中使用了事件侦听器，应用程序崩溃。
请告诉我使用 eventListener 的正确方法是什么。
这是我在 logcat 中遇到的错误：
我可以跟踪的错误如下：
java.lang.NoSuchMethodException: android.os.MessageQueue#enableMonitor()#bestmatch
Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
-21 19:51:47.919 19135-19135/? I/art: Late-enabling -Xcheck:jni
02-21 19:51:47.975 19135-19135/? D/TidaProvider: TidaProvider()
02-21 19:51:47.984 19135-19135/? W/ReflectionUtils: java.lang.NoSuchMethodException: android.os.MessageQueue#enableMonitor()#bestmatch
at miui.util.ReflectionUtils.findMethodBestMatch(ReflectionUtils.java:338)
at miui.util.ReflectionUtils.findMethodBestMatch(ReflectionUtils.java:375)
at miui.util.ReflectionUtils.callMethod(ReflectionUtils.java:800)
at miui.util.ReflectionUtils.tryCallMethod(ReflectionUtils.java:818)
at android.os.BaseLooper.enableMonitor(BaseLooper.java:47)
at android.os.Looper.prepareMainLooper(Looper.java:111)
at android.app.ActivityThread.main(ActivityThread.java:5584)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
02-21 19:51:48.076 19135-19135/? W/ResourceType: No package identifier when getting name for resource number 0x00000000
02-21 19:51:48.098 19135-19135/com.example.android.miwok W/System: ClassLoader referenced unknown path: /data/app/com.example.android.miwok-1/lib/arm64
02-21 19:51:48.176 19135-19135/com.example.android.miwok D/AndroidRuntime: Shutting down VM
02-21 19:51:48.179 19135-19135/com.example.android.miwok E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android.miwok,PID: 19135
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.android.miwok/com.example.android.miwok.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2396)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2545)
at android.app.ActivityThread.access$1100(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1396)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5601)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
at android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:68)
at android.support.v7.app.AppCompatDelegateImplV7.<init>(AppCompatDelegateImplV7.java:145)
at android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:28)
at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:41)
at android.support.v7.app.AppCompatDelegateImplV23.<init>(AppCompatDelegateImplV23.java:29)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:186)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:170)
at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:502)
at android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:174)
at com.example.android.miwok.MainActivity.<init>(MainActivity.java:25)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2386)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2545)
at android.app.ActivityThread.access$1100(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1396)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5601)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774)`
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
02-21 19:51:49.940 19135-19135/com.example.android.miwok I/Process: Sending signal. PID: 19135 SIG: 9
我的课程如下：
package com.example.android.miwok;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView family=(TextView) findViewById(R.id.family);
TextView colors=(TextView) findViewById(R.id.colors);
TextView Phrases=(TextView) findViewById(R.id.phrases);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set the content of the activity to use the activity_main.xml layout file
setContentView(R.layout.activity_main);
TextView numbers=(TextView)findViewById(R.id.numbers);
if(numbers!=null){
numbers.setOnClickListener(view -> {
Intent i=new Intent(MainActivity.this,NumbersActivity.class);
startActivity(i);
});
}
}
public void openNumbersActivity(View view){
Intent i=new Intent(this,NumbersActivity.class);
startActivity(i);
}
}
解决方法
请在下次发布您的日志和报价。为了更好的阅读，在代码之前发布
无论如何，最好在 onCreate() 或由它调用的方法中初始化视图。
您从未调用过 openNumberActivity()，确定应该在 setOnClickListener() 中调用它吗？！
你也可以通过MainActivity#this获取当前MainActivity的实例，你可以直接输入“this”
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