[英]How to change image in custom ListView item - Android
我們正在嘗試從自定義ListView項更改圖像。 我們已經嘗試了一切,直到該項目不再編譯為止。 我們從頭開始,直到要點按ListView項時將圖像src從ListView項設置為其他內容。
這是我們的整個代碼:
package com.example.namename.listview;
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String[] foods = {"Bacon","Ham","Tuna","Candy","Meatball","Potato"};
ListAdapter buckysAdapter = new CustomAdapter(this, foods);
ListView buckysListView = (ListView) findViewById(R.id.buckysListView);
buckysListView.setAdapter(buckysAdapter);
buckysListView.setOnItemClickListener(
new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String food = String.valueOf(parent.getItemAtPosition(position));
Toast.makeText(MainActivity.this, food, Toast.LENGTH_SHORT).show();
}
}
);
}
}
package com.example.namename.listview;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomAdapter extends ArrayAdapter<String> {
public CustomAdapter (Context context, String[] foods) {
super(context, R.layout.custom_row, foods);
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater buckysInflater = LayoutInflater.from(getContext());
View customView = buckysInflater.inflate(R.layout.custom_row, parent, false);
String singleFoodItem = getItem(position);
TextView buckysText = (TextView) customView.findViewById(R.id.buckysText);
ImageView buckysImage = (ImageView) customView.findViewById(R.id.buckysImage);
buckysText.setText(singleFoodItem);
buckysImage.setImageResource(R.drawable.deselected);
return customView;
}
}
-------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/custom_row">
<ImageView
android:layout_width="80dp"
android:layout_height="80dp"
android:id="@+id/buckysImage"
android:src="@drawable/deselected"
android:layout_margin="5dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/buckysText"
android:layout_margin="5dp" />
</LinearLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/buckysListView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
想要在輕按ListView項目時將圖像src從ListView項目設置為其他內容
使用onItemClick
方法的view
參數更改所選行的ImageView
:
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
ImageView selectedImage = (ImageView) view.findViewById(R.id.buckysImage);
selectedImage.setImageResource(R.drawable.selected);
}
您可以編寫customView Click偵聽器方法,然后在點按ListView項時可以根據需要更改圖像。
customView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
buckysImage.setImageResource("Your Image Resource");
}
});
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater buckysInflater = LayoutInflater.from(getContext());
View customView = buckysInflater.inflate(R.layout.custom_row, parent, false);
String singleFoodItem = getItem(position);
TextView buckysText = (TextView) customView.findViewById(R.id.buckysText);
ImageView buckysImage = (ImageView) customView.findViewById(R.id.buckysImage);
buckysText.setText(singleFoodItem);
buckysImage.setImageResource(R.drawable.deselected);
// set a listener to buckysImage
buckysImage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
buckysImage.setImageResource(R.id.newImage);
}
});
return customView;
}
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