具有自定义列表视图的Alertdialog - 未触发单击事件

时间：2018-01-02 16:31:33

标签： java android listview adapter onitemclicklistener

我的目标是创建一个显示选项列表的alertdialog，每个选项都由图像和文本表示。用户应该在alertdialog中做出选择并进行验证。 我决定用它里面的自定义ListView构建这个alertdialog。到目前为止，没有问题，但我找不到一种方法来做选择。 我想创建一个单击事件或复选框，但这些选项似乎都不起作用。对我来说最优雅的方式是列表视图的特定行上的click事件，这是我的代码。现在，如果我点击它，它什么都不做。 非常感谢您的帮助。 

MainActivity

    public class MainActivity extends AppCompatActivity implements 
    View.OnClickListener{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button b1 = (Button) this.findViewById(R.id.button);
        b1.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        LayoutInflater inflater = 
    (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View row = inflater.inflate(R.layout.row_item,null);

        ListView LV = (ListView)row.findViewById(R.id.Listview_card);

        Resources res = getApplicationContext().getResources();
        String[] names = res.getStringArray(R.array.image_name);
        int[] images =
    {R.drawable.image01,R.drawable.image02,R.drawable.image03,  
    R.drawable.image04};

        ArrayList<singleRow> array_list = new ArrayList<>();

        for (int i = 0; i < names.length; i++){
            array_list.add(new singleRow(names[i],images[i]));
        }

        CustomAdapter adapter = new CustomAdapter(getApplicationContext(), 
    array_list);
        LV.setAdapter(adapter);
        LV.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                                      @Override
                                      public void onItemClick(AdapterView<?> 
    parent, View view, int position, long id) {
                                         Toast.makeText(getApplicationContext(), 
    "coucou2", Toast.LENGTH_SHORT);
                                      }
                                  });

        builder.setView(row);
        builder.setPositiveButton("Validate Choice",new 
    DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {

            Toast.makeText(getApplicationContext(),"coucou3",Toast.LENGTH_LONG);
            }
        });

        AlertDialog dialog = builder.create();

        dialog.show();
    }}

activity_main xml
    <android.support.constraint.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.replics.customlist.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        tools:layout_editor_absoluteX="49dp"
        tools:layout_editor_absoluteY="44dp" /
    </android.support.constraint.ConstraintLayout>

CustomAdapter
    public class CustomAdapter extends BaseAdapter {

    private Context mContext;
    private ArrayList<singleRow> array_list;

    CustomAdapter(Context mContext, ArrayList<singleRow> List_Sent) {
        this.mContext = mContext;
        this.array_list = List_Sent;
    }

    @Override
    public View getView(int i, View View, ViewGroup Viewgroup) {
        LayoutInflater inflater = 
    (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View row = inflater.inflate(R.layout.custom_listview,Viewgroup,false);

        //find objet in each line
        TextView TV = (TextView)row.findViewById(R.id.textview_custo_LV);
        ImageButton IM = 
    (ImageButton)row.findViewById(R.id.image_button_custo_LV);

        //get the position
        singleRow temp_obj = array_list.get(i);

        //set each line
        TV.setText(temp_obj.name);
        IM.setImageResource(temp_obj.image);

        //give the right properties to the image
        IM.setScaleType(ImageView.ScaleType.FIT_XY);
        IM.setAdjustViewBounds(true);
        IM.setPadding(0, 0, 0, 0);

        //return final line
        return row;
    }

    @Override
    public Object getItem(int i) {
        return array_list.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public int getCount() {
        return array_list.size();
    }

    }

row_item xml
    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/parent_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:id="@+id/Button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="List all images" />
    <ListView
        android:id="@+id/Listview_card"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true" />
    </RelativeLayout>

singleRow
    public class singleRow {
    String name;
    int image;
    public singleRow(String name, int image) {
        this.name = name;
        this.image = image;
         }
    }

custom_listview xml
    <?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">

    <ImageButton
        android:id="@+id/image_button_custo_LV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:src="@drawable/image01" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id = "@+id/textview_custo_LV"
        android:layout_weight="1"
        android:text="image01" />

    </LinearLayout>

2 个答案:

答案 0 :(得分：0)

所以你想在列表中有复选框吗？解决方案很简单

在对话框内，列表适配器在模型类中添加一个变量，以便在选中复选框时保存

并在您的适配器中添加侦听器，如此

 mQuestionCheckbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    if (isChecked) {
                        modelList.get(getAdapterPosition()).setChecked(true);
                    } else {
                        modelList.get(getAdapterPosition()).setChecked(false);
                    }
                }
            });

它的作用基本上是修改项目的当前对象，无论是否检查，并获取值只是循环当前的模型列表，并通过我们之前制作的布尔变量检查是否检查了它

这样的事情：

for (int i = 0; i < modelList.size(); i++) { //loop through your data list
            QuestionerKerusakanModel current = modelList.get(i);
            if (current.isChecked()) { //check if the item is checked or not
                tempGejala.add(current); //adding it to new filtered List or modify the object however you want
            }
        }

并且你应该开始使用RecyclerView而不是ListView，它只有更好的原则。

答案 1 :(得分：0)

我已经解决了我的问题。

我所做的是修改listview的每一行，以便每个包含一个复选框。 单击验证按钮时，我会读取用户答案并确定它是否是有效答案。 但是，我现在有另一个问题，但我发布了一个新问题，因为这两个问题并没有真正相关。

这是我的自定义行布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageButton
    android:id="@+id/image_button_custo_LV"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:src="@drawable/wonder01" />
<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <CheckBox
        android:id="@+id/checkBox_custo_LV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Choisir" />
    <TextView
        android:id="@+id/textview_custo_LV"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Wonder1" />
</LinearLayout>

这是我的listview布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/parent_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
    <TextView
            android:id="@+id/Text_Expl_List"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:text="Choose one card: "
            android:textSize="18sp" />
        <ListView
            android:id="@+id/Listview_card"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true" />

这是我的活动布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
tools:context="com.boardgamereplics.customlistforstackflow.MainActivity">
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />
</LinearLayout>

单行java类：

public class singleRow {
String name;
int image;
boolean ischecked;


public singleRow(String name, int image, boolean ischecked) {
    this.name = name;
    this.image = image;
    this.ischecked = ischecked;
}

自定义适配器java类：

public class CustomAdapter extends BaseAdapter { //implements View.OnClickListener {

private Context mContext;
private ArrayList<singleRow> array_list;
//TODO change l'objet singlerow par card et arrange toi pour passer les cartes que tu veux.

CustomAdapter(Context mContext, ArrayList<singleRow> List_Sent) {
    this.mContext = mContext;
    this.array_list = List_Sent;
}

@Override
public View getView(int i, View View, ViewGroup Viewgroup) {
    LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View row = inflater.inflate(R.layout.one_line_model,null);

    //find objet in each line
    TextView TV = (TextView)row.findViewById(R.id.textview_custo_LV);
    ImageButton IM = (ImageButton)row.findViewById(R.id.image_button_custo_LV);
    CheckBox CB = (CheckBox)row.findViewById(R.id.checkBox_custo_LV);

    //get the position
    singleRow temp_obj = array_list.get(i);

    //set each line
    TV.setText(temp_obj.name);
    IM.setImageResource(temp_obj.image);
    CB.setChecked(false);

    //give the right properties to the image
    IM.setScaleType(ImageView.ScaleType.FIT_XY);
    IM.setAdjustViewBounds(true);
    IM.setPadding(0, 0, 0, 0);

    //return final line
    return row;
}

@Override
public Object getItem(int i) {
    return array_list.get(i);
}

@Override
public long getItemId(int i) {
    return i;
}

@Override
public int getCount() {
    return array_list.size();
}

主要活动：

public class MainActivity extends AppCompatActivity {
    Button b1 = null;
    Context ctx = null;
    TextView T_pop1 = null;
    TextView T_pop2 = null;
    AlertDialog.Builder builder_pop2 = null;
    AlertDialog.Builder builder_pop1 = null;
    // ListView LV_pop1 = null;
    // ListView LV_pop2 = null;
    Button Validate_btn_pop1 = null;
    Button Validate_btn_pop2 = null;

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

    ctx = this;
    b1 = (Button) this.findViewById(R.id.button);

    b1.setOnClickListener(new android.view.View.OnClickListener() {
                              @Override
                              public void onClick(View arg0) {
                                  displayAlert();
                              }
                          }
    );

}

public void displayAlert() {
    builder_pop1 = new AlertDialog.Builder(ctx);

    LayoutInflater inflater_pop1 = (LayoutInflater) ctx.getSystemService(LAYOUT_INFLATER_SERVICE);
    View listview_lay_pop1 = inflater_pop1.inflate(R.layout.listview_lay, null);

    //identify objet in second alertdialog
    final ListView LV_pop1 = (ListView) listview_lay_pop1.findViewById(R.id.Listview_card);

    //populate listview
    Resources res = getApplicationContext().getResources();
    String[] names = res.getStringArray(R.array.wonders_name1);
    int[] images = {R.drawable.wonder01, R.drawable.wonder02, R.drawable.wonder03, R.drawable.wonder04};

    ArrayList<singleRow> array_list_pop1 = new ArrayList<>();

    for (int i = 0; i < names.length; i++) {
        array_list_pop1.add(new singleRow(names[i], images[i], false));
    }

    CustomAdapter adapter_pop1 = new CustomAdapter(getApplicationContext(), array_list_pop1);
    LV_pop1.setAdapter(adapter_pop1);

    builder_pop1.setView(listview_lay_pop1);
    builder_pop1.setPositiveButton("OK", null);
    final AlertDialog dialog_pop1 = builder_pop1.create();

    dialog_pop1.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog_ins_pop1) {
            //Overriding the handler immediately after show is probably a better approach than OnShowListener as described below
            T_pop1 = (TextView) ((AlertDialog) dialog_pop1).findViewById(R.id.Text_Expl_List);
            Validate_btn_pop1 = ((AlertDialog) dialog_pop1).getButton(AlertDialog.BUTTON_POSITIVE);
            Validate_btn_pop1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v_pop1) {
                    Integer choice = 0;
                    Integer counter_ischecked = 0;
                    for (int i = 0; i < 4; i++) {
                        CheckBox CBF_pop1 = (CheckBox) LV_pop1.getChildAt(i).findViewById(R.id.checkBox_custo_LV);
                        boolean isSelected = CBF_pop1.isChecked();
                        if (isSelected == true) {
                            choice = choice + i;
                            counter_ischecked++;
                        }
                    }
                    if (counter_ischecked == 0) {
                        T_pop1.setText("Choose one card");
                    }
                    if (counter_ischecked == 1) {
                        b1.setText("Success");
                        dialog_pop1.dismiss();
                    }
                    if (counter_ischecked != 0 && counter_ischecked != 1) {
                        T_pop1.setText("Choose only one card");
                    }

                }
            }
            );
        }
    });
    dialog_pop1.show();
}
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