Weitergabe der Bild-ID an den benutzerdefinierten Listview-Adapter

Question

Wie kann ich eine Image-Ressourcen-ID an meinen benutzerdefinierten Adapter übergeben? Ich habe ein Kontrollkästchen in einer Aktivität namens routedetails. Wenn das Kontrollkästchen aktiviert ist, möchte ich ein Häkchen neben diesem Element in der Listenansicht anzeigen. Aber um dies zu tun, muss ich die imageId an den benutzerdefinierten Adapter übergeben. Ich habe es mit einer Absicht putExtra versucht. Aber das funktioniert nicht.

Heres mein RouteDetails.java mit der Checkbox Code

public class RouteDetails extends AppCompatActivity { 

ImageView routeImage; 
String routeName; 
CheckBox routeCheckBox; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_route_details); 

    //back button for route details view 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 


    ///////checkbox/////////////////////////////////////////// 
    routeCheckBox = (CheckBox) findViewById(R.id.routeCheckBox); 
    ////// final ImageView checkImageView = (ImageView) findViewById(R.id.checkImageView); 
    routeCheckBox.setOnClickListener(new View.OnClickListener() { 
    public void onClick(View view) 
    { 
     if (routeCheckBox.isChecked()) 
     { 
      //checkImageView.setImageResource(R.drawable.checkmark); 
      Intent check = new Intent(RouteDetails.this,CustomAdapter.class); 
      check.putExtra("checkImageResource", R.drawable.checkmark); 
      startActivity(check); 
     ///////////////////////////////////////////// 


//sets actionbar title 
routeName = getIntent().getExtras().getString("routeName"); 
getSupportActionBar().setTitle(routeName); 

//TextView for route details 
final TextView routeDetailsView = (TextView) findViewById(R.id.routeDetailsView); 
routeDetailsView.setText(getIntent().getExtras().getCharSequence("route")); 

//ImageView for route details 
routeImage = (ImageView) findViewById(R.id.routeImage); 
final int mImageResource = getIntent().getIntExtra("imageResourceId", 0); 
routeImage.setImageResource(mImageResource); 

Und hier ist der benutzerdefinierte Adapter

class CustomAdapter extends ArrayAdapter<CharSequence>{ 

    public CustomAdapter(Context context, CharSequence[] routes) { 
    super(context, R.layout.custom_row ,routes); 
    } 

@NonNull 
@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

LayoutInflater routeInflater = LayoutInflater.from(getContext()); 
View customView = convertView; 
if(customView == null){customView = routeInflater.inflate(R.layout.custom_row, parent, false);} 

CharSequence singleRoute = getItem(position); 
TextView routeText = (TextView) customView.findViewById(R.id.routeText); 
routeText.setText(singleRoute); 

////////trying to set checkmark///// 
ImageView checkImageView = (ImageView) customView.findViewById(R.id.checkImageView); 
checkImageView.setImageResource(((Activity) getContext()).getIntent().getIntExtra("checkImageResource",0)); 
//////////////////////////////////////// 

return customView; 
} 

Und hier ist der Adapter

list view with xml array of routes 
final CharSequence[] routeListViewItems = getResources().getTextArray(R.array.routeList); 

//custom adapter for list view 
ListAdapter routeAdapter = new CustomAdapter(this, routeListViewItems); 
final ListView routeListView = (ListView) findViewById(R.id.routeListView); 
routeListView.setAdapter(routeAdapter); 

in meiner Haupttätigkeit verwendet wird Beliebig Hilfe würde geschätzt werden

Answer 1

Grundsätzlich erstellen Sie zwei Aktivitäten. Sagen wir, MyListViewActivity enthält eine ListView, deren Elemente nichts anderes sind als benutzerdefinierte Ansichten, die ein ImageView und ein TextView enthalten. dann eine CheckBoxActivity, die die CheckBox-Elemente enthält. Wenn auf ein Listenelement in MyListViewActivity geklickt wird, starten Sie die CheckboxAttivity mit der Methode startActivityForResult().

Schließlich, in der CheckBoxActivity, wenn ein CheckBox-Element aktiviert ist wird sein TextValue zurück an MyListViewActivity zum Aktualisieren der entsprechenden ImageView gesendet. unter Code-Schnipsel Siehe:

Layout-Datei für MyListViewActivity: activity_my_list_view.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/activity_my_list_view" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="YourPackageNameHere.MyListViewActivity" > 

<ListView 
android:id="@+id/list" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" > 
</ListView> 

</RelativeLayout> 

Layout-Datei für benutzerdefinierte Liste Artikel: list_single.xml

<?xml version="1.0" encoding="utf-8"?> 
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" > 
<TableRow> 
    <LinearLayout 
     android:layout_width="match_parent" 
     android:orientation="horizontal"> 
     <ImageView 
      android:id="@+id/img" 
      android:layout_width="40dp" 
      android:layout_height="40dp"/> 

     <TextView 
      android:id="@+id/txt" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="@dimen/activity_horizontal_margin" 
      android:layout_gravity="center_horizontal|center_vertical" /> 

    </LinearLayout> 


</TableRow> 
</TableLayout> 

Layout-Datei für CheckBoxActivity: activity_checkbox.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/activity_checkbox" 
android:orientation="vertical" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="YourPackageNameHere.CheckboxActivity"> 

<CheckBox 
    android:text="CheckBox1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 

    android:id="@+id/checkBox1" /> 
<CheckBox 
    android:text="CheckBox2" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/checkBox2" /> 
</LinearLayout> 

Code für MyListViewActivity:

package YourPackageNameHere; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 

public class MyListViewActivity extends AppCompatActivity { 
ImageView img; 
ListView list; 
private static final int MY_REQUEST_CODE= 1; 
String[] itemNames = { 
     "Google Plus", 
     "Twitter", 
     "Windows", 
     "Bing", 
     "Itunes", 
     "Wordpress", 
     "Drupal" 
} ; 
Integer[] imageId = { 
     R.drawable.ic_home_black_18dp, 
     R.drawable.ic_account_circle_black_18dp, 
     R.drawable.ic_fingerprint_black_18dp, 
     R.drawable.ic_help_black_18dp, 
     R.drawable.ic_settings_black_18dp, 
     R.drawable.ic_power_settings_new_black_18dp, 
     R.drawable.ic_directions_run_black_18dp 

}; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_my_list_view); 

    CustomList adapter = new CustomList(MyListViewActivity.this, itemNames, imageId); 
    list=(ListView)findViewById(R.id.list); 
    list.setAdapter(adapter); 
    list.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

      Toast.makeText(MyListViewActivity.this, "You Clicked at " + itemNames[+ position], Toast.LENGTH_SHORT).show(); 

      //get the image that has been clicked 
      img= (ImageView) view.findViewById(R.id.img); 

      //Starting the CheckBoxAtivity for result 
      Intent mIntent = new Intent(getBaseContext(), CheckboxActivity.class); 
      startActivityForResult(mIntent, MY_REQUEST_CODE); 
     } 
    }); 

} 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 

    if (requestCode == MY_REQUEST_CODE) { 

     if(resultCode == Activity.RESULT_OK){ 
      String result=data.getStringExtra("result"); 
      switch (result){ 
       case "CheckBox1": 
        img.setImageResource(R.drawable.ic_gps_fixed_black_18dp); 
        break; 
       case "CheckBox2": 
        img.setImageResource(R.drawable.cast_ic_notification_0); 
        break; 
      } 
     } 

    } 
}//onActivityResult 

public class CustomList extends ArrayAdapter<String> { 

    private final Activity context; 
    private final String[] itemNames; 
    private final Integer[] imageId; 
    public CustomList(Activity context, String[] itemNames, Integer[] imageId) { 
     super(context, R.layout.list_single, itemNames); 
     this.context = context; 
     this.itemNames = itemNames; 
     this.imageId = imageId; 

    } 
    @Override 
    public View getView(int position, View view, ViewGroup parent) { 
     LayoutInflater inflater = context.getLayoutInflater(); 
     View rowView= inflater.inflate(R.layout.list_single, null, true); 
     TextView txtTitle = (TextView) rowView.findViewById(R.id.txt); 

     ImageView imageView = (ImageView) rowView.findViewById(R.id.img); 
     txtTitle.setText(itemNames[position]); 

     imageView.setImageResource(imageId[position]); 
     return rowView; 
    } 
} 
} 

Code für ChecboxActivity:

package YourPackageNameHere 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.widget.CheckBox; 
import android.widget.CompoundButton; 

public class CheckboxActivity extends AppCompatActivity { 

CheckBox mCheckBox1; 
CheckBox mCheckBox2; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_checkbox); 

    mCheckBox1 = (CheckBox) findViewById(R.id.checkBox1); 
    mCheckBox2 = (CheckBox) findViewById(R.id.checkBox2); 

    mCheckBox1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
     @Override 
     public void onCheckedChanged(CompoundButton compoundButton, boolean b) { 
      if(mCheckBox1.isChecked()){ 
       sendResultToLisViewActivity((String) mCheckBox1.getText()); //send the text string of mCheckBox1 to MyListViewActivity 
      } 
     } 
    }); 

    mCheckBox2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
     @Override 
     public void onCheckedChanged(CompoundButton compoundButton, boolean b) { 
      if(mCheckBox2.isChecked()){ 
       sendResultToLisViewActivity((String) mCheckBox2.getText()); //send the text string of mCheckBox1 to MyListViewActivity 
      } 
     } 
    }); 

} 

public void sendResultToLisViewActivity(String mStringExtra){ 
    Intent returnIntent = new Intent(); 
    returnIntent.putExtra("result",mStringExtra); 
    setResult(Activity.RESULT_OK,returnIntent); 
    finish(); 
} 
} 

schließlich in Ihrem MainActivity onCreate() -Methode starten Sie MyListViewActivity wie folgt:

Intent i = new Intent(MainActivity.this, MyListViewActivity.class); 
startActivity(i); 

Ps: ich dies bezeichnet link zum Erstellen der benutzerdefinierten ListView mit Bildern und Text.