问题
So using Android Studio 2.3.1 I have the most simple app possible, using default settings and choosing a Basic App template. The app gets created just fine, but crashes if you try to click the options button at the top right corner - i.e. the three dots. This is a serious problem...
This is the error:
04-30 17:51:13.871 13942-13942/com.topository.optionstest01 W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
04-30 17:51:17.987 13942-13942/com.topository.optionstest01 D/AndroidRuntime: Shutting down VM
04-30 17:51:17.988 13942-13942/com.topository.optionstest01 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.topository.optionstest01, PID: 13942
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
at android.support.v7.view.menu.ListMenuItemView.setTitle(ListMenuItemView.java:127)
at android.support.v7.view.menu.ListMenuItemView.initialize(ListMenuItemView.java:113)
at android.support.v7.view.menu.MenuAdapter.getView(MenuAdapter.java:100)
at android.support.v7.view.menu.MenuPopup.measureIndividualMenuWidth(MenuPopup.java:160)
at android.support.v7.view.menu.StandardMenuPopup.tryShow(StandardMenuPopup.java:153)
at android.support.v7.view.menu.StandardMenuPopup.show(StandardMenuPopup.java:187)
at android.support.v7.view.menu.MenuPopupHelper.showPopup(MenuPopupHelper.java:290)
at android.support.v7.view.menu.MenuPopupHelper.tryShow(MenuPopupHelper.java:175)
at android.support.v7.widget.ActionMenuPresenter$OpenOverflowRunnable.run(ActionMenuPresenter.java:803)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6121)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
Here is my gradle.build file:
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.3"
defaultConfig {
applicationId "com.topository.optionstest01"
minSdkVersion 23
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:design:25.3.1'
testCompile 'junit:junit:4.12'
}
For completeness:
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Here is my menu.xml:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/settings"
android:orderInCategory="100"
android:title="Settings"
android:titleCondensed="The settings"
app:showAsAction="never"/>
</menu>
And the device is a Pixel running 7.1.2
Has anyone else come across this? Any ideas?
Thanks
回答1:
I have had the same issue, my app was crashing, and the example basic app from Android Studio was crashing on clicking "options"menu button (with three dots), too.
Crash log:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at android.support.v7.view.menu.ListMenuItemView.setTitle(ListMenuItemView.java:127) at android.support.v7.view.menu.ListMenuItemView.initialize(ListMenuItemView.java:113) at android.support.v7.view.menu.MenuAdapter.getView(MenuAdapter.java:100) at android.support.v7.view.menu.MenuPopup.measureIndividualMenuWidth(MenuPopup.java:160) at android.support.v7.view.menu.StandardMenuPopup.tryShow(StandardMenuPopup.java:153) at android.support.v7.view.menu.StandardMenuPopup.show(StandardMenuPopup.java:187) at android.support.v7.view.menu.MenuPopupHelper.showPopup(MenuPopupHelper.java:290) at android.support.v7.view.menu.MenuPopupHelper.tryShow(MenuPopupHelper.java:175) at android.support.v7.widget.ActionMenuPresenter$OpenOverflowRunnable.run(ActionMenuPresenter.java:803) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Setup: Android Studio 2.3.1 Gradle 3.3
The solution that I have found was downgrading Gradle plugin from 3.3 down to 2.14.1
1) Replace the plugin version in top-level build.gradle:
dependencies {
//REPLACED 2.3.3->2.2.3(MENU ISSUE)
//classpath 'com.android.tools.build:gradle:2.3.3'
classpath 'com.android.tools.build:gradle:2.2.3'
...
}
If you use a wrapper 2) delete the /gradle/wrapper/gradle-wrapper.jar
3) replace the contents of /gradle/wrapper/gradle-wrapper.properties
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
build-> clean project -> rebuild project -> the crash when acessing three-dot upper-right corner menu had gone.
来源：https://stackoverflow.com/questions/43704306/application-crashes-on-clicking-options