我的activity_main.xml中有一个文本框，我想根据文本框中的文本更改片段中的图像视图的内容。
我试着从字段中读取文本(ChangeFragment函数(，并将其解析为ChangeImage函数，该函数具有一些if函数，可以根据解析的文本更改imageview的内容。
EditDataActivity.java
package com.example.attempttwo;
import android.content.Intent;
import android.media.Image;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.Fragment;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class EditDataActivity extends AppCompatActivity {
private static final String TAG = "EditDataActivity";
private Button btnSave,btnDelete, btnImage;
private EditText editable_item;
DatabaseHelper mDatabaseHelper;
private String selectedName;
private int selectedID;
public String edit_name;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_data_layout);
btnSave = (Button) findViewById(R.id.btnSave);
btnDelete = (Button) findViewById(R.id.btnDelete);
btnImage = (Button) findViewById(R.id.btnViewImage);
editable_item = (EditText) findViewById(R.id.editable_item);
mDatabaseHelper = new DatabaseHelper(this);
//get the intent extra from the ListDataActivity
Intent receivedIntent = getIntent();
//now get the itemID we passed as an extra
selectedID = receivedIntent.getIntExtra("id",-1); //NOTE: -1 is just the default value
//now get the name we passed as an extra
selectedName = receivedIntent.getStringExtra("name");
//set the text to show the current selected name
editable_item.setText(selectedName);
btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String item = editable_item.getText().toString();
if(!item.equals("")){
mDatabaseHelper.updateName(item,selectedID,selectedName);
}else{
toastMessage("You must enter a name");
}
}
});
btnDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mDatabaseHelper.deleteName(selectedID,selectedName);
editable_item.setText("");
toastMessage("removed from database");
}
});
}
private void toastMessage(String message){
Toast.makeText(this,message, Toast.LENGTH_SHORT).show();
}
public void ChangeFragment(View view){
Fragment fragment;
//FragmentTwo fTwo = new FragmentTwo();
edit_name = editable_item.getText().toString();
//Checking the text is getting read properly
Toast.makeText(this, edit_name, Toast.LENGTH_LONG).show();
if( view == findViewById(R.id.btnViewImage)){
fragment = new FragmentTwo();
((FragmentTwo) fragment).ChangeImage(edit_name);
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fragment_place, fragment);
ft.commit();
}if( view == findViewById(R.id.btnClose)){
fragment = new FragmentImage();
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fragment_place, fragment);
ft.commit();
}
}
}
FragmentTwo.java
package com.example.attempttwo;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;
/**
* A simple {@link Fragment} subclass.
* Use the {@link FragmentTwo#newInstance} factory method to
* create an instance of this fragment.
*/
public class FragmentTwo extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
ViewGroup rootView;
ImageView imgView;
public FragmentTwo() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment FragmentTwo.
*/
// TODO: Rename and change types and number of parameters
public static FragmentTwo newInstance(String param1, String param2) {
FragmentTwo fragment = new FragmentTwo();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = (ViewGroup) inflater.inflate(R.layout.fragment_two, container, false);
imgView = (ImageView)rootView.findViewById(R.id.imageViewShow);
// Inflate the layout for this fragment
return rootView;
}
public void ChangeImage(String edit_name){
if(edit_name == "Sabo"){
ImageView img = (ImageView) rootView.findViewById(R.id.imageViewShow);
img.setImageResource(R.drawable.sabo);
img.setVisibility(View.VISIBLE);
} if (edit_name == "Tsunade"){
ImageView img = (ImageView)rootView.findViewById(R.id.imageViewShow);
img.setImageResource(R.drawable.tsunade);
img.setVisibility(View.VISIBLE);
} if(edit_name == "Tanjiro"){
ImageView img = (ImageView)rootView.findViewById(R.id.imageViewShow);
img.setImageResource(R.drawable.tanjiro);
img.setVisibility(View.VISIBLE);
} if(edit_name == "Saitama"){
ImageView img = (ImageView)rootView.findViewById(R.id.imageViewShow);
img.setImageResource(R.drawable.saitama);
img.setVisibility(View.VISIBLE);
} if(edit_name == "Boruto"){
ImageView img = (ImageView) rootView.findViewById(R.id.imageViewShow);
img.setImageResource(R.drawable.boruto);
img.setVisibility(View.VISIBLE);
}
}
}
任何帮助都将不胜感激。
感谢
您可以创建一个静态函数，根据android文档中的内容返回您要查找的资源的ID
public static int getResourceIDByName(Context context, String name, String defType, String defPackage) throws RuntimeException {
try {
return context.getResources().getIdentifier(name, defType, defPackage);
} catch (Exception e) {
throw new RuntimeException("Error to getting Resource id for "+name, e);
}
}
并且，要获得Fragment中资源的引用ID，可以调用如下函数
getResourceIDByName(getActivity(), "iconName", "drawable", getActivity().getPackageName());
举个例子：
public void ChangeImage(String edit_name){
try {
ImageView img = (ImageView) rootView.findViewById(R.id.imageViewShow);
int resourseID = getResourceIDByName(getActivity(), edit_name, "drawable", getActivity().getPackageName());
img.setImageResource(resourseID);
img.setVisibility(View.VISIBLE);
}catch (RuntimeException e){
//TODO Handler error
}
}
记住在运行时处理异常
在决定使用此方法之前，请阅读文档，其中有以下注意事项：不鼓励使用此功能。通过标识符检索资源比通过名称检索资源效率高得多