Java ANDROID：无法解析方法 getSupportActionBar()
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ANDROID: Cannot resolve method getSupportActionBar()
提问by Thomas Riddler
This thing is driving me nuts. I can't seem to get my app to compile correctly. I have added the support libraries in my app by copying the jar files, dropping them into libs folder, right click and adding them as library.
这件事让我发疯。我似乎无法让我的应用程序正确编译。我通过复制 jar 文件，将它们放入 libs 文件夹，右键单击并将它们添加为库，在我的应用程序中添加了支持库。
I have tried extending ActionBaractivity and nothing still not getting that method recognized.
我已经尝试扩展 ActionBaractivity 并且仍然没有得到该方法的认可。
I am using Android studio version 0.8.2.
我正在使用 Android Studio 版本 0.8.2。
Class
班级
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class mainActivity extends Activity implements AdapterView.OnItemClickListener {
private DrawerLayout drawerLayout;
private ListView listView;
private String[] navMenuArray;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
navMenuArray = getResources().getStringArray(R.array.navmenu);
listView =(ListView) findViewById(R.id.drawerList);
listView.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_expandable_list_item_1, navMenuArray));
listView.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//handles what happens when an item in the menu is clicked
Toast.makeText(this,navMenuArray[position]+" was selected", Toast.LENGTH_SHORT).show();
selectItem(position);
}
public void selectItem(int position){
listView.setItemChecked(position, true);
setTitle(navMenuArray[position]);
}
public void setTitle(String title){
getSupportActionbar().setTitle(title);
}
}
MANIFEST
显现
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.myapp" >
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/Theme.AppCompat" >
<activity
android:name=".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>
</application>
</manifest>
build.gradle
构建.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 20
buildToolsVersion '20.0.0'
defaultConfig {
applicationId "com.myapp"
minSdkVersion 14
targetSdkVersion 20
versionCode 1
versionName "1.0"
}
compileOptions{
sourceCompatibility JavaVersion.VERSION_1_7
targetCompatibility JavaVersion.VERSION_1_7
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:support-v4:18.0.+'
compile 'com.android.support:appcompat-v7:18.0.+'
}
采纳答案by Giancarlo
you need to change Activity to ActionBarActivity
您需要将 Activity 更改为 ActionBarActivity
public class mainActivity extends ActionBarActivity
public class mainActivity extends ActionBarActivity
ActionBarActivity has been deprecated so please use the following
ActionBarActivity 已被弃用，因此请使用以下内容
public class mainActivity extends AppCompatActivity
public class mainActivity extends AppCompatActivity
回答by C James
Your activity needs to extend ActionBarActivity (which provides getSupportActionBar).
您的活动需要扩展 ActionBarActivity（提供 getSupportActionBar）。
回答by michaelcarrano
Remove the support library jars from the libs directory as you already defined the support library in your gradle file.
dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:support-v4:18.0.+' compile 'com.android.support:appcompat-v7:18.0.+' }The support library has been updated so I would update your gradle dependencies to: compile 'com.android.support:support-v4:19.1.+'
Android Studio will already notify you but make sure you sync with gradle.
- Rather than extending from Activity, extend from ActionBarActivity.
从 libs 目录中删除支持库 jar，因为您已经在 gradle 文件中定义了支持库。
dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:support-v4:18.0.+' compile 'com.android.support:appcompat-v7:18.0.+' }支持库已更新，因此我会将您的 gradle 依赖项更新为：compile 'com.android.support:support-v4:19.1.+'
Android Studio 已经会通知您，但请确保您与 gradle 同步。
- 不是从 Activity 扩展，而是从 ActionBarActivity 扩展。
回答by ehab mousa
This will solve the problem:
这将解决问题：
import android.support.v7.widget.Toolbar;
回答by Nilesh Panchal
It is simple, just extend AppCompatActivity instead of Activity.
很简单，只是扩展 AppCompatActivity 而不是 Activity。
Please Note that you need to change theme to avoid
请注意，您需要更改主题以避免
Exception : You need to use a Theme.AppCompat theme (or descendant) with this activity
例外：您需要在此活动中使用 Theme.AppCompat 主题（或后代）
while using AppCompatActivity
使用 AppCompatActivity 时
