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现在的Android有三个键#xff1a; 任务键#xff0c;Home键#xff0c;返回键#xff0c;也就是没有菜单键了#xff0c;那么如何如何触发onCreateOp…
文章目录小结问题及解决无法触发onCreateOptionsMenu(Menu menu)修改配置文件解决使用一个按钮来触发其它办法参考小结
现在的Android有三个键 任务键Home键返回键也就是没有菜单键了那么如何如何触发onCreateOptionsMenu(Menu menu)这个方法呢测试了两种办法来触发这个onCreateOptionsMenu(Menu menu)方法以达到显示菜单的效果。
问题及解决
无法触发onCreateOptionsMenu(Menu menu)
如果没有正确设置是不会触发onCreateOptionsMenu(Menu menu)这个方法也就是菜单无法触发显示不出来。
修改配置文件解决
参考CSDN: Android Studio 没有 gradle.properties 文件需要在工程根目录下创建gradle.properties这个文件内容如下
android.useAndroidXtrue
android.enableJetifiertrue参考关于在Fragment中设置Menu无效问题在AndroidManifest.xml里添加android:themestyle/ThemeOverlay.AppCompat.ActionBar这行以激活ActionBar的使用。 AndroidManifest.xml的内容如下
?xml version1.0 encodingutf-8?
manifest xmlns:androidhttp://schemas.android.com/apk/res/androidpackageexample.menuandroid:versionCode1android:versionName1.0android:themestyle/ThemeOverlay.AppCompat.ActionBarapplication android:icondrawable/icon android:labelstring/app_nameactivity android:name.MenuTestandroid:labelstring/app_nameintent-filteraction android:nameandroid.intent.action.MAIN /category android:nameandroid.intent.category.LAUNCHER //intent-filter/activity/application
/manifest dependencies是这样设置的
dependencies {compile fileTree(dir: libs, include: *.jar)//implementation androidx.appcompat:appcompat:1.0.0//implementation android.support.v7.widget//compile com.android.support:appcompat-v7:21.0.implementation com.android.support:appcompat-v7:29.0.
}碰到以下问题 uses-sdk:minSdkVersion 1 cannot be smaller than version 14 declared in library [androidx.appcompat:appcompat:1.0.0] C:\Users\LENOVO\.gradle\caches\transforms-3\9bee862a3eadd8338cd2918c9dad0196\transformed\appcompat-1.0.0\AndroidManifest.xml as the library might be using APIs not available in 1 Suggestion: use a compatible library with a minSdk of at most 1, or increase this projects minSdk version to at least 14, or use tools:overrideLibraryandroidx.appcompat to force usage (may lead to runtime failures) 参考Android: App Manifest Overview 和 Stackoverlfow: Manifest merger failed : uses-sdk:minSdkVersion 1 cannot be smaller than version 14 declared in library
在build.gradle里添加 defaultConfig {
// other config options...minSdkVersion 14}添加了以下的包引用
import androidx.appcompat.widget.Toolbar;
import androidx.appcompat.app.AppCompatActivity;参考Stackoverflow: You need to use a Theme.AppCompat theme (or descendant) with this activity注意 MenuTest 是继承自Activity而不是AppCompatActivity或者ActionBarActivity .
public class MenuTest extends Activity
//public class MenuTest extends AppCompatActivity最后的效果点以下红框中三个点的地方可以触发菜单。 触发菜单如下红框所示 使用一个按钮来触发
参考Stackoverflow: Handling the missing MENU button in new versions of Android (3.x and up) 和 Android: Progamatically Open and Close an Activity’s Option Menu
在界面中添加一个按钮Pop Up Menu可以在按钮事件中添加 openOptionsMenu();这个方法来触发菜单的。在方法中添加以下监听器 Button button (Button) findViewById(R.id.button_send);button.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {// Do something in response to button clickopenOptionsMenu();}});点以下红框中的按钮可以触发菜单。 点以上的按钮也是可以触发菜单的效果跟先前Actionbar触发菜单是一样的。
最后整个的build.gradle文件内容如下
buildscript {repositories {google()mavenCentral()}dependencies {classpath com.android.tools.build:gradle:4.2.0}
}
apply plugin: androiddependencies {compile fileTree(dir: libs, include: *.jar)//implementation androidx.appcompat:appcompat:1.0.0//implementation android.support.v7.widget//compile com.android.support:appcompat-v7:21.0.implementation com.android.support:appcompat-v7:29.0.}allprojects {repositories {google()//jcenter()}}android {compileSdk 29buildToolsVersion 29.0.0defaultConfig {
// other config options...minSdkVersion 14}sourceSets {main {manifest.srcFile AndroidManifest.xmljava.srcDirs [src]resources.srcDirs [src]aidl.srcDirs [src]renderscript.srcDirs [src]res.srcDirs [res]assets.srcDirs [assets]}// Move the tests to tests/java, tests/res, etc...//instrumentTest.setRoot(tests)// Move the build types to build-types/type// For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...// This moves them out of them default location under src/type/... which would// conflict with src/ being used by the main source set.// Adding new build types or product flavors should be accompanied// by a similar customization.debug.setRoot(build-types/debug)release.setRoot(build-types/release)}
}
整个的源代码如下
package example.menu;import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.EditText;
import android.widget.Toast;import android.app.Fragment;
//import androidx.fragment.app.Fragment;
//import android.support.v7.widget.Toolbar;
//import androidx.appcompat.app.AppCompatActivity;
//import androidx.appcompat.app.AppCompatActivity;
//import androidx.appcompat.widget.Toolbar;import androidx.appcompat.widget.Toolbar;
import androidx.appcompat.app.AppCompatActivity;
//import android.support.v7.app.ActionBarActivity;
//import android.support.v7.app.AppCompatActivity;import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;public class MenuTest extends Activity
//public class MenuTest extends AppCompatActivity
{final int FONT_10 0x111;final int FONT_12 0x112;final int FONT_14 0x113;final int FONT_16 0x114;final int FONT_18 0x115;final int PLAIN_ITEM 0x11b;final int FONT_RED 0x116;final int FONT_BLUE 0x117;final int FONT_GREEN 0x118;private EditText edit;Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);edit (EditText) findViewById(R.id.txt);// Toolbar toolbar (Toolbar) findViewById(R.id.toolbar);
// setSupportActionBar(toolbar);//setHasOptionsMenu(true);
// Toolbar toolbar findViewById(R.id.toolbar);
// toolbar.inflateMenu(R.menu.menu_main);//setHasOptionsMenu(true);//call it from onCreate(); or onViewCreated();//Toolbar myToolbar (Toolbar) findViewById(R.id.toolbar);//android.widget.Toolbar myToolbar (android.widget.Toolbar) findViewById(R.id.toolbar);//setSupportActionBar(myToolbar);//setSupportActionBar(myToolbar);//((MainActivity) getActivity()).setSupportActionBar(myToolbar);Button button (Button) findViewById(R.id.button_send);button.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {// Do something in response to button clickopenOptionsMenu();}});}Overridepublic boolean onCreateOptionsMenu(Menu menu){SubMenu fontMenu menu.addSubMenu(Font Size);fontMenu.setIcon(R.drawable.font);fontMenu.setHeaderIcon(R.drawable.font);fontMenu.setHeaderTitle(Select font size);fontMenu.add(0, FONT_10, 0, 10 font size);fontMenu.add(0, FONT_12, 0, 12 font size);fontMenu.add(0, FONT_14, 0, 14 font size);fontMenu.add(0, FONT_16, 0, 16 font size);fontMenu.add(0, FONT_18, 0, 18 font size);menu.add(0, PLAIN_ITEM, 0, Normal Menu Selection (Toast));SubMenu colorMenu menu.addSubMenu(Text Color);colorMenu.setIcon(R.drawable.color);colorMenu.setHeaderIcon(R.drawable.color);colorMenu.setHeaderTitle(Select Text Color);colorMenu.add(0, FONT_RED, 0, Red);colorMenu.add(0, FONT_GREEN, 0, Green);colorMenu.add(0, FONT_BLUE, 0, Blue);// Inflate the menu; this adds items to the action bar if it is present.//getMenuInflater().inflate(R.menu.job_status_option_menu, menu);return super.onCreateOptionsMenu(menu);}Overridepublic boolean onOptionsItemSelected(MenuItem mi){switch (mi.getItemId()){case FONT_10:edit.setTextSize(10 * 2);break;case FONT_12:edit.setTextSize(12 * 2);break;case FONT_14:edit.setTextSize(14 * 2);break;case FONT_16:edit.setTextSize(16 * 2);break;case FONT_18:edit.setTextSize(18 * 2);break;case FONT_RED:edit.setTextColor(Color.RED);break;case FONT_GREEN:edit.setTextColor(Color.GREEN);break;case FONT_BLUE:edit.setTextColor(Color.BLUE);break;case PLAIN_ITEM:Toast toast Toast.makeText(MenuTest.this, This is a toast message! , Toast.LENGTH_SHORT);toast.show();break;}return true;}}main.xml的内容如下
?xml version1.0 encodingutf-8?
LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidandroid:orientationverticalandroid:layout_widthfill_parentandroid:layout_heightfill_parent
EditText android:idid/txt android:layout_widthfill_parent android:layout_heightwrap_content android:textFor Test Purpose! android:editablefalse/Button xmlns:androidhttp://schemas.android.com/apk/res/androidandroid:idid/button_sendandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:textPop Up Menuandroid:onClickpopUpMenu /
/LinearLayout
其它办法
参考Android: Set up the app bar 可以使用setSupportActionBar(myToolbar);的Toolbar来触发onCreateOptionsMenu(Menu menu)这个方法这个没试过不清楚效果怎么样。
Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_my);Toolbar myToolbar (Toolbar) findViewById(R.id.my_toolbar);setSupportActionBar(myToolbar);
}参考
CSDN: Android Studio 没有 gradle.properties 文件 CSDN: onCreateOptionsMenu和onPrepareOptionsMenu用法 关于在Fragment中设置Menu无效问题 CSDN: 关于 fragment重写onCreateOptionsMenu不执行问题 Stackoverflow: Handling the missing MENU button in new versions of Android (3.x and up) Stackoverlfow: Manifest merger failed : uses-sdk:minSdkVersion 1 cannot be smaller than version 14 declared in library Android: Progamatically Open and Close an Activity’s Option Menu Android: App Manifest Overview Android: Set up the app bar Android studio: cannot find symbol variable toolbar Stackoverflow: Error “package android.support.v7.app does not exist” Stackoverflow: Can’t use android.support.v7.widget.Toolbar with android.useAndroidXtrue Stackoverflow: setsupportactionbar() throws error Stackoverflow: Android error: cannot find symbol class ActionBarActivity Stackoverflow: You need to use a Theme.AppCompat theme (or descendant) with this activity
