如何在GridView中更改图像? [英] How to change image in GridView?
本文介绍了如何在GridView中更改图像?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我对GridView有问题.我想通过GridView中的代码(而不是OnClickListener等)来更改图像，但是我失去了希望...这是我的代码:
I have a problem with GridView. I want to change image through code in GridView (not OnClickListener etc.) but I have lost any hope...here's my code:
ImageAdapter:
ImageAdapter:
package com.example.rafal.gra;
import android.content.Context;
import android.content.res.Resources;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter{
private Context CTX;
public Integer image_id[] = {R.mipmap.right_head,R.mipmap.right_head,R.mipmap.right_head,
R.mipmap.right_head, R.mipmap.right_head, R.mipmap.right_head, R.mipmap.right_head,
R.mipmap.right_head,R.mipmap.right_head,R.mipmap.right_head,R.mipmap.right_head,
R.mipmap.right_head};
public ImageAdapter(Context CTX){
this.CTX = CTX;
}
@Override
public int getCount() {
return image_id.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView img;
int height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 80,
CTX.getResources().getDisplayMetrics());
if(convertView == null){
img = new ImageView(CTX);
img.setLayoutParams(new GridView.LayoutParams(height,height));
img.setScaleType(ImageView.ScaleType.CENTER_CROP);
img.setPadding(1,1,1,1);
}else{
img = (ImageView) convertView;
}
img.setImageResource(image_id[position]);
return img;
}
}
EquipmentActivity:
EquipmentActivity:
package com.example.rafal.gra;
import android.app.ActionBar;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class EquipmentActivity extends AppCompatActivity {
String postacWeapon, postacShield;
int postacHpotion, postacMpotion;
Backpack backpack;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_equipment);
final GridView grid = (GridView) findViewById(R.id.gridView);
grid.setAdapter(new ImageAdapter(this));
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getBaseContext(), "You clicked on image " + position, Toast.LENGTH_LONG).show();
}
});
odczyt();
eq();
backpack = new Backpack("sword_of_faith","","","","","","","","","","","");
backpack();
}
@Override
public void onBackPressed() {
AlertDialog.Builder exit = new AlertDialog.Builder(this);
exit.setMessage("Are you sure you want to exit the application?")
.setNegativeButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//zapis();
finish();
System.exit(0);
}
})
.setPositiveButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.create();
exit.show();
}
public void powrot(View view) {
//zapis();
startActivity(new Intent(getApplicationContext(), MainActivity.class));
finish();
}
public void odczyt() {
SharedPreferences loadE = getSharedPreferences("Save", MODE_PRIVATE);
SharedPreferences.Editor editor4 = loadE.edit();
postacWeapon = loadE.getString("sword", "");
postacShield = loadE.getString("shield", "");
postacHpotion = loadE.getInt("hpotion", 0);
postacMpotion = loadE.getInt("mpotion",0);
}
public void eq() {
TextView hp = (TextView) findViewById(R.id.textViewHp);
TextView mp = (TextView) findViewById(R.id.textViewMp);
hp.setText(Integer.toString(postacHpotion)+" ");
mp.setText(Integer.toString(postacMpotion) + " ");
ImageView weapon = (ImageView) findViewById(R.id.imageViewWeapon);
ImageView shield = (ImageView) findViewById(R.id.imageViewShield);
switch (postacWeapon) {
case "short_sword":
weapon.setImageResource(R.mipmap.short_sword);
break;
default:
weapon.setImageResource(R.mipmap.weapon_empty);
}
switch (postacShield) {
case "shield_zero":
shield.setImageResource(R.mipmap.shield_zero);
break;
default:
shield.setImageResource(R.mipmap.shield_empty);
}
}
public void backpack(){
final GridView grid = (GridView) findViewById(R.id.gridView);
grid.setAdapter(new ImageAdapter(this));
ImageView slot = (ImageView) findViewById((int)grid.getItemIdAtPosition(0));
slot.setImageResource(R.mipmap.sword_of_faith);
}
}
这里最重要的是public void Backpack().在其中，我想编写代码以更改GridView中的图像.我希望有人能帮助我.
The most important thing here is public void backpack(). Inside it I want to write code to change image in GridView. I hope someone will help me.
我知道Backpack()中有一个例外，但我想向您展示我如何做到这一点.
I know that there is an exception in backpack() but I wanted to show you how I want to be it done.
推荐答案
您可以向 ImageAdapter 添加新方法，如下所示:
You can add a new method to your ImageAdapter, something like this:
public void changeImage(int position, int image){
if(position >= 0 && position < images_id.length){
image_id[position] = image;
notifyDataSetChanged();
}
}
这是如何使用它:
GridView grid = (GridView) findViewById(R.id.gridView);
((ImageAdapter)grid.getAdapter()).changeImage(0, R.mipmap.sword_of_faith);
此外，您应该考虑将 GridView 和 ImageAdapter 实例设置为类变量，这样就不必在每次使用它们时都创建它们.
Also, you should consider setting the GridView and ImageAdapter instances as class variables so you won't have to create them every time you need to use them.
这篇关于如何在GridView中更改图像?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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