Java Android中标签的程序结构
我正在尝试构建一个简单的应用程序,通过标签导航(以及通过按钮等进一步导航)。 我画了一个我想构建的小场景。 情景描写 为此,我使用TabActivity和FragmentManager。 因此,编译器已经告诉我TabActivity已被弃用。如果此结构已被弃用,请让我知道并告诉我使用什么。这是到目前为止我的代码。直到我按下按钮,它才能工作。什么也没发生(只是按钮消失了)。我已经尝试过FragmentManager的添加、隐藏和显示方法。请让我知道我是否应该把我的全部代码放在这里 MainActivity.javaJava Android中标签的程序结构,java,android,fragmentmanager,tabactivity,Java,Android,Fragmentmanager,Tabactivity,我正在尝试构建一个简单的应用程序,通过标签导航(以及通过按钮等进一步导航)。 我画了一个我想构建的小场景。 情景描写 为此,我使用TabActivity和FragmentManager。 因此,编译器已经告诉我TabActivity已被弃用。如果此结构已被弃用,请让我知道并告诉我使用什么。这是到目前为止我的代码。直到我按下按钮,它才能工作。什么也没发生(只是按钮消失了)。我已经尝试过FragmentManager的添加、隐藏和显示方法。请让我知道我是否应该把我的全部代码放在这里 MainAct
package com.example.tabstackoverflow;
import android.app.TabActivity;
import android.os.Bundle;
import android.widget.TabHost;
public class MainActivity extends TabActivity {
HandleTabActivity tabAct;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab_layout);
tabAct = new HandleTabActivity();
TabHost tabHost = tabAct.getTabActivity(this);
tabHost.setCurrentTab(0);
}
}
package com.example.tabstackoverflow;
import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.widget.TabHost;
import com.example.tabstackoverflow.Tab1Activity;
import com.example.tabstackoverflow.Tab2Activity;
public class HandleTabActivity {
HandleTabActivity() {
}
public TabHost getTabActivity (TabActivity curActivity) {
Resources ressources = curActivity.getResources();
TabHost tabHost = curActivity.getTabHost();
//Tab 1
Intent intentOwn = new Intent().setClass(curActivity, Tab1Activity.class);
TabHost.TabSpec tabSpecOwn = tabHost
.newTabSpec("Tab 1")
.setIndicator("", ressources.getDrawable(R.drawable.pic_tab1))
.setContent(intentOwn);
//Tab 2
Intent intentGet = new Intent().setClass(curActivity, Tab2Activity.class);
TabHost.TabSpec tabSpecGet = tabHost
.newTabSpec("Tab 2")
.setIndicator("", ressources.getDrawable(R.drawable.pic_tab2))
.setContent(intentGet);
// add all tabs
tabHost.addTab(tabSpecOwn);
tabHost.addTab(tabSpecGet);
return tabHost;
}
}
package com.example.tabstackoverflow;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
public class Tab1Activity extends AppCompatActivity implements Tab1Fragment1.SetViewToTab2 {
private final String TAG = "<GetHelpTAG>";
private Fragment fragment1;
private Fragment fragment2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab1);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
fragment1 = Tab1Fragment1.newInstance();
fragment2 = Tab1Fragment2.newInstance();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragmentPlaceholder, fragment2);
transaction.commit();
}
@Override
public void onAttachFragment(Fragment fragment) {
if (fragment instanceof Tab1Fragment1) {
Tab1Fragment1 getHelpSearchFragment = (Tab1Fragment1) fragment;
getHelpSearchFragment.setListener(this);
}
}
@Override
public void onButtonClicked() {
Toast.makeText(getBaseContext(),
"OnClickListener !!!",
Toast.LENGTH_SHORT).show();
fragment2 = Tab1Fragment2.newInstance();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.show(fragment2);
transaction.replace(R.id.fragmentPlaceholder, fragment2);
transaction.commit();
}
}
HandleTabActivity.java
package com.example.tabstackoverflow;
import android.app.TabActivity;
import android.os.Bundle;
import android.widget.TabHost;
public class MainActivity extends TabActivity {
HandleTabActivity tabAct;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab_layout);
tabAct = new HandleTabActivity();
TabHost tabHost = tabAct.getTabActivity(this);
tabHost.setCurrentTab(0);
}
}
package com.example.tabstackoverflow;
import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.widget.TabHost;
import com.example.tabstackoverflow.Tab1Activity;
import com.example.tabstackoverflow.Tab2Activity;
public class HandleTabActivity {
HandleTabActivity() {
}
public TabHost getTabActivity (TabActivity curActivity) {
Resources ressources = curActivity.getResources();
TabHost tabHost = curActivity.getTabHost();
//Tab 1
Intent intentOwn = new Intent().setClass(curActivity, Tab1Activity.class);
TabHost.TabSpec tabSpecOwn = tabHost
.newTabSpec("Tab 1")
.setIndicator("", ressources.getDrawable(R.drawable.pic_tab1))
.setContent(intentOwn);
//Tab 2
Intent intentGet = new Intent().setClass(curActivity, Tab2Activity.class);
TabHost.TabSpec tabSpecGet = tabHost
.newTabSpec("Tab 2")
.setIndicator("", ressources.getDrawable(R.drawable.pic_tab2))
.setContent(intentGet);
// add all tabs
tabHost.addTab(tabSpecOwn);
tabHost.addTab(tabSpecGet);
return tabHost;
}
}
package com.example.tabstackoverflow;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
public class Tab1Activity extends AppCompatActivity implements Tab1Fragment1.SetViewToTab2 {
private final String TAG = "<GetHelpTAG>";
private Fragment fragment1;
private Fragment fragment2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab1);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
fragment1 = Tab1Fragment1.newInstance();
fragment2 = Tab1Fragment2.newInstance();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragmentPlaceholder, fragment2);
transaction.commit();
}
@Override
public void onAttachFragment(Fragment fragment) {
if (fragment instanceof Tab1Fragment1) {
Tab1Fragment1 getHelpSearchFragment = (Tab1Fragment1) fragment;
getHelpSearchFragment.setListener(this);
}
}
@Override
public void onButtonClicked() {
Toast.makeText(getBaseContext(),
"OnClickListener !!!",
Toast.LENGTH_SHORT).show();
fragment2 = Tab1Fragment2.newInstance();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.show(fragment2);
transaction.replace(R.id.fragmentPlaceholder, fragment2);
transaction.commit();
}
}
Tab1Activity.java
package com.example.tabstackoverflow;
import android.app.TabActivity;
import android.os.Bundle;
import android.widget.TabHost;
public class MainActivity extends TabActivity {
HandleTabActivity tabAct;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab_layout);
tabAct = new HandleTabActivity();
TabHost tabHost = tabAct.getTabActivity(this);
tabHost.setCurrentTab(0);
}
}
package com.example.tabstackoverflow;
import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.widget.TabHost;
import com.example.tabstackoverflow.Tab1Activity;
import com.example.tabstackoverflow.Tab2Activity;
public class HandleTabActivity {
HandleTabActivity() {
}
public TabHost getTabActivity (TabActivity curActivity) {
Resources ressources = curActivity.getResources();
TabHost tabHost = curActivity.getTabHost();
//Tab 1
Intent intentOwn = new Intent().setClass(curActivity, Tab1Activity.class);
TabHost.TabSpec tabSpecOwn = tabHost
.newTabSpec("Tab 1")
.setIndicator("", ressources.getDrawable(R.drawable.pic_tab1))
.setContent(intentOwn);
//Tab 2
Intent intentGet = new Intent().setClass(curActivity, Tab2Activity.class);
TabHost.TabSpec tabSpecGet = tabHost
.newTabSpec("Tab 2")
.setIndicator("", ressources.getDrawable(R.drawable.pic_tab2))
.setContent(intentGet);
// add all tabs
tabHost.addTab(tabSpecOwn);
tabHost.addTab(tabSpecGet);
return tabHost;
}
}
package com.example.tabstackoverflow;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
public class Tab1Activity extends AppCompatActivity implements Tab1Fragment1.SetViewToTab2 {
private final String TAG = "<GetHelpTAG>";
private Fragment fragment1;
private Fragment fragment2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab1);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
fragment1 = Tab1Fragment1.newInstance();
fragment2 = Tab1Fragment2.newInstance();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragmentPlaceholder, fragment2);
transaction.commit();
}
@Override
public void onAttachFragment(Fragment fragment) {
if (fragment instanceof Tab1Fragment1) {
Tab1Fragment1 getHelpSearchFragment = (Tab1Fragment1) fragment;
getHelpSearchFragment.setListener(this);
}
}
@Override
public void onButtonClicked() {
Toast.makeText(getBaseContext(),
"OnClickListener !!!",
Toast.LENGTH_SHORT).show();
fragment2 = Tab1Fragment2.newInstance();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.show(fragment2);
transaction.replace(R.id.fragmentPlaceholder, fragment2);
transaction.commit();
}
}
package com.example.tabstackoverflow;
导入android.app.Fragment;
导入android.app.FragmentManager;
导入android.app.FragmentTransaction;
导入android.os.Bundle;
导入android.widget.Toast;
导入androidx.appcompat.app.appcompat活动;
导入androidx.appcompat.widget.Toolbar;
公共类Tab1Activity扩展了AppCompatActivity实现了Tab1Fragment1.SetViewToTab2{
私有最终字符串标记=”;
私有片段片段1;
私有片段片段2;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab1);
Toolbar Toolbar=findviewbyd(R.id.Toolbar);
设置支持操作栏(工具栏);
fragment1=Tab1Fragment1.newInstance();
fragment2=Tab1Fragment2.newInstance();
FragmentManager=getFragmentManager();
FragmentTransaction=manager.beginTransaction();
事务.替换(R.id.fragmentPlaceholder,fragment2);
commit();
}
@凌驾
公共碎片(碎片碎片){
if(Tab1Fragment1的片段实例){
Tab1Fragment1 getHelpSearchFragment=(Tab1Fragment1)片段;
getHelpSearchFragment.setListener(此);
}
}
@凌驾
public void onButtonClicked(){
Toast.makeText(getBaseContext(),
“OnClickListener!!!”,
吐司。长度(短)。show();
fragment2=Tab1Fragment2.newInstance();
FragmentManager=getFragmentManager();
FragmentTransaction=manager.beginTransaction();
交易展示(片段2);
事务.替换(R.id.fragmentPlaceholder,fragment2);
commit();
}
}
Tab1Fragment1.java
package com.example.tabstackoverflow;
import android.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class Tab1Fragment1 extends Fragment {
private Button mSearchButton;
private final String TAG = "<Tab1Fragment1TAG>";
SetViewToTab2 callback;
public static Tab1Fragment1 newInstance() {
Bundle args = new Bundle();
Tab1Fragment1 fragment = new Tab1Fragment1();
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.content_tab1_view1, container, false);
addListenerOnButton(v);
return v;
}
public void addListenerOnButton(View v) {
mSearchButton = v.findViewById(R.id.button);
mSearchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "pushed");
callback.onButtonClicked();
}
});
}
public void setListener (SetViewToTab2 callback) {
this.callback = callback;
}
public interface SetViewToTab2 {
public void onButtonClicked();
}
}
package com.example.tabstackoverflow;
导入android.app.Fragment;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.ArrayAdapter;
导入android.widget.Button;
导入android.widget.Spinner;
导入android.widget.TextView;
导入java.util.ArrayList;
导入java.util.List;
公共类Tab1Fragment1扩展了片段{
专用按钮mSearchButton;
私有最终字符串标记=”;
SetViewToTab2回调;
公共静态选项卡1Fragment1 newInstance(){
Bundle args=新Bundle();
Tab1Fragment1 fragment=新的Tab1Fragment1();
fragment.setArguments(args);
返回片段;
}
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
视图v=充气机。充气(R.layout.content\u tab1\u view1,容器,假);
addListenerOnButton(v);
返回v;
}
公共无效addListenerOnButton(视图v){
mSearchButton=v.findviewbyd(R.id.button);
mSearchButton.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
Log.d(标记“推压”);
callback.onButtonClicked();
}
});
}
公共无效setListener(SetViewToTab2回调){
this.callback=回调;
}
公共接口SetViewToTab2{
public void onButtonClicked();
}
}
activity_tab1.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Tab1Activity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay"/>
</com.google.android.material.appbar.AppBarLayout>
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.example.tabstackoverflow.Tab1Fragment1"
android:id="@+id/fragmentPlaceholder"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
我会根据需要更新我的问题。谢谢你的建议 我发现我所拥有的标签实际上没有其他标签。使用提供的NavController非常简单,甚至有一个UI来可视化应用程序的导航。这个问题太琐碎了还是我的问题不清楚?请给我反馈。