动态添加按钮和设置监听器

Question

我在动态添加按钮和设置onClickListener时遇到问题。这就是我现在所拥有的：

        List<Button> bList = new ArrayList<Button>();

        for(int i = 0; i < 3; i++) {
            q = i;
            bList.add(new Button(this.activity));
            bList.get(i).setText(Integer.toString(q));
            bList.get(i).setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    statsButton.setText(Integer.toString(q));
                }
            });
            upgradeLayout.addView(bList.get(i));
        }

除了听众不工作外，它工作正常。当我点击按钮时没有任何反应，但按钮创建得很好。

答案：这是导致问题的与此无关的愚蠢行为。道歉。

Answer 1

试试这个......

1. <强> activity_main.xml中

    <LinearLayout 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:orientation="vertical"
    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=".MainActivity">
   
    <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Dynamically adding buttons and setting Listeners" />
   
    <LinearLayout
      android:id="@+id/btn_layout"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical" />
   
   </LinearLayout>
   

2的 MainActivity.java

public class MainActivity extends AppCompatActivity {

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


   //Method to generate button dynamically
   private void addbtnDynamically(){
    try{
        LinearLayout layout = (LinearLayout) findViewById(R.id.btn_layout);

        for (int i = 0; i < 3; i++) {
            LinearLayout row = new LinearLayout(this);
            row.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

            for (int j = 0; j < 3; j++ ){
                Button button = new Button(this);
                button.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
                button.setText("Button " + (j + 1 + (i * 3)));
                button.setTextColor(Color.WHITE);
                button.setId(j + 1 + (i * 3));
                button.setOnClickListener(onClickListener);
                row.addView(button);
            }

            layout.addView(row);
        }
    }catch(Exception b){b.printStackTrace();}
}

//Method for click event
private View.OnClickListener onClickListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case 1:
                showToast("Button 1 clicked!");
                break;
            case 2:
                showToast("Button 2 clicked!");
                break;
            case 3:
                showToast("Button 3 clicked!");
                break;
            case 4:
                showToast("Button 4 clicked!");
                break;
    //       .......
        }
     }
    };

     //Method to message
     private void showToast(String content){
      Toast.makeText(MainActivity.this,""+content,Toast.LENGTH_SHORT).show();
      }
 }

3 <强>结果

你应该得到像这样的输出......



快乐的编码......

Answer 2

试试这个，

main.xml中

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.addbuttondynamic.AddButtonDynamic" >

</LinearLayout>

Main.java

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

public class AddButtonDynamic extends Activity {

    LinearLayout upgradeLayout;

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

        upgradeLayout=(LinearLayout)findViewById(R.id.LinearLayout1);
         LinearLayout.LayoutParams lprams = new LinearLayout.LayoutParams(
                 LinearLayout.LayoutParams.WRAP_CONTENT,
                 LinearLayout.LayoutParams.WRAP_CONTENT);

         LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                 LinearLayout.LayoutParams.MATCH_PARENT,
                 LinearLayout.LayoutParams.WRAP_CONTENT);

         for(int k=0; k<3; k++)
         {
             LinearLayout ll = new LinearLayout(this);
             ll.setId(k+1);
             ll.setLayoutParams(params);
             for(int i=0;i<3;i++) {
                    Button btn = new Button(this);
                    btn.setId(i+1);
                    btn.setText("Button"+(i+1));
                    btn.setLayoutParams(lprams);
                    final int index = i;
                    btn.setOnClickListener(new OnClickListener() {

                        @Override
                        public void onClick(View v) {
                            // TODO Auto-generated method stub
                            Log.i("TAG", "The index is" + index);
                            Toast.makeText(getApplicationContext(), "Click "+index, Toast.LENGTH_LONG).show();
                        }
                    });
                    ll.addView(btn);
                }
             upgradeLayout.addView(ll);
         }


    }
}

很高兴为您提供帮助。