Java 通过2个片段之间的接口传递ArrayList
嘿,我尝试在一个活动中通过Java 通过2个片段之间的接口传递ArrayList,java,android,android-fragments,arraylist,interface,Java,Android,Android Fragments,Arraylist,Interface,嘿,我尝试在一个活动中通过接口方法在两个片段之间传递数组列表。 日志显示没有错误,但是我在一个片段中添加的ArrayList项在另一个片段中的微调器中未显示。 我会发布我的全部代码,所以如果你看到我的问题,如果你能给我解释一下解决方案就好了。提前谢谢 MainActivity.java package de.kwietzorek.fulcrumwebview; import android.app.Activity; import android.support.v4.app.Fragme
接口
方法在两个片段之间传递数组列表
。
日志显示没有错误,但是我在一个片段中添加的ArrayList
项在另一个片段中的微调器中未显示。
我会发布我的全部代码,所以如果你看到我的问题,如果你能给我解释一下解决方案就好了。提前谢谢
MainActivity.java
package de.kwietzorek.fulcrumwebview;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity implements Callback {
static WebView myWebView;
Fragment AddServerFragment, WebViewFragment;
ArrayList<String> server_name_list;
@Override
public ArrayList<String> getArrayListFromActivity() {
WebViewFragment frag = (WebViewFragment) getSupportFragmentManager().findFragmentByTag("AddServerFragment");
if (frag != null) {
server_name_list = frag.getArrayListFromActivity();
}
return server_name_list;
}
/* Menu */
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.webview:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, new WebViewFragment() {
})
.commit();
return true;
case R.id.add_server:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, new AddServerFragment() {
})
.commit();
return true;
case R.id.menu_refresh:
myWebView.reload();
return true;
default:
return true;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (findViewById(R.id.container) != null) {
if (savedInstanceState != null) {
return;
}
AddServerFragment = new Fragment();
WebViewFragment = new Fragment();
}
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, new WebViewFragment() {
})
.commit();
}
/*WebView Fragment*/
public class WebViewFragment extends Fragment {
String selected;
Spinner spinner;
public WebViewFragment(){
}
private Callback callback;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
callback = (Callback) activity;}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.webview, container, false);
/* WebView */
myWebView = (WebView) view.findViewById(R.id.webView);
myWebView.setWebViewClient(new WebC());
WebSettings webSettings = myWebView.getSettings();
/* JavaScript Enable */
webSettings.setJavaScriptEnabled(true);
/* Server Name Spinner */
ArrayList<String> server_name_list = callback.getArrayListFromActivity();
if (server_name_list != null) {
spinner = (Spinner) view.findViewById(R.id.server_spinner);
;
ArrayAdapter<String> server_adapter = new ArrayAdapter<String>(this.getActivity(),
android.R.layout.simple_spinner_item, server_name_list);
server_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(server_adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
selected = parent.getItemAtPosition(pos).toString();
myWebView.loadUrl(selected);
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
return view;
}
public ArrayList<String> getArrayListFromActivity() {
return server_name_list;
}
}
/*Add Server Fragment*/
public class AddServerFragment extends Fragment
implements View.OnClickListener {
@Override
public void onClick(View view) {
}
public AddServerFragment(){
}
Button btn_back, btn_add;
EditText server_ip, server_name;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.add_ip, container, false);
server_ip = (EditText) view.findViewById(R.id.edit_server_address);
server_name = (EditText) view.findViewById(R.id.edit_server_name);
btn_back = (Button) view.findViewById(R.id.btn_back);
btn_back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, new WebViewFragment() {
})
.commit();
}
});
btn_add = (Button) view.findViewById(R.id.btn_add);
btn_add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String new_server_ip = null, new_server_name = null;
ArrayList<String> server_name_list = new ArrayList<>();
ArrayList<String> server_ip_list = new ArrayList<>();
new_server_ip = server_ip.getText().toString();
server_ip_list.add(new_server_ip);
new_server_name = server_name.getText().toString();
server_name_list.add(new_server_name);
}
});
return view;
}
}
/* WebView Client */
public class WebC extends WebViewClient {
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
}
}
}
package de.kwietzorek.fulcrumwebview;
import java.util.ArrayList;
public interface Callback {
ArrayList<String> getArrayListFromActivity();
}
package de.kwietzorek.fulcrumwebview;
导入android.app.Activity;
导入android.support.v4.app.Fragment;
导入android.os.Bundle;
导入android.support.v7.app.AppActivity;
导入android.view.LayoutInflater;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.view.view;
导入android.view.ViewGroup;
导入android.webkit.WebSettings;
导入android.webkit.WebView;
导入android.webkit.WebViewClient;
导入android.widget.AdapterView;
导入android.widget.ArrayAdapter;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.Spinner;
导入java.util.ArrayList;
公共类MainActivity扩展AppCompatActivity实现回调{
静态WebView-myWebView;
片段AddServerFragment,WebViewFragment;
ArrayList服务器名称列表;
@凌驾
公共ArrayList GetArrayList FromActivity(){
WebViewFragment frag=(WebViewFragment)getSupportFragmentManager().findFragmentByTag(“AddServerFragment”);
如果(frag!=null){
服务器名称列表=frag.getArrayListFromActivity();
}
返回服务器名称列表;
}
/*菜单*/
@凌驾
公共布尔onCreateOptions菜单(菜单){
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
开关(item.getItemId()){
案例R.id.webview:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container,新的WebViewFragment(){
})
.commit();
返回true;
案例R.id.add_服务器:
getSupportFragmentManager().beginTransaction()
.replace(R.id.container,新的AddServerFragment(){
})
.commit();
返回true;
案例R.id.菜单\刷新:
myWebView.reload();
返回true;
违约:
返回true;
}
}
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(findViewById(R.id.container)!=null){
如果(savedInstanceState!=null){
返回;
}
AddServerFragment=新片段();
WebViewFragment=新片段();
}
getSupportFragmentManager().beginTransaction()
.replace(R.id.container,新的WebViewFragment(){
})
.commit();
}
/*网络视图片段*/
公共类WebViewFragment扩展了片段{
选择字符串;
纺纱机;
公共WebViewFragment(){
}
私有回调;
@凌驾
公共事务主任(活动){
超级转速计(活动);
回调=(回调)活动;}
@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=充气机。充气(R.layout.webview,container,false);
/*网络视图*/
myWebView=(WebView)view.findviewbyd(R.id.WebView);
setWebViewClient(新的WebC());
WebSettings WebSettings=myWebView.getSettings();
/*JavaScript启用*/
setJavaScriptEnabled(true);
/*服务器名称微调器*/
ArrayList服务器_name_list=callback.getArrayListFromActivity();
if(服务器名称列表!=null){
微调器=(微调器)视图.findViewById(R.id.server\u微调器);
;
ArrayAdapter服务器\u适配器=新的ArrayAdapter(this.getActivity(),
android.R.layout.simple\u微调器\u项目、服务器\u名称\u列表);
server_adapter.setDropDownViewResource(android.R.layout.simple_微调器_下拉项);
spinner.setAdapter(服务器适配器);
spinner.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener(){
已选择公共位置(AdapterView父项、视图、整数位置、长id){
selected=parent.getItemAtPosition(pos.toString();
myWebView.loadUrl(选中);
}
未选择公共无效(AdapterView父级){
}
});
}
返回视图;
}
公共ArrayList GetArrayList FromActivity(){
返回服务器名称列表;
}
}
/*添加服务器片段*/
公共类AddServerFragment扩展了片段
实现View.OnClickListener{
@凌驾
公共void onClick(视图){
}
公共AddServerFragment(){
}
按钮btn_后退,btn_添加;
EditText服务器ip,服务器名称;
@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=充气机。充气(R.layout.add_ip,container,false);
server\u ip=(EditText)view.findViewById(R.id.edit\u server\u地址);
服务器名称=(EditText)视图.findViewById(R.id.edit\s