Eclipse 开发 Android, Hello FormStuff（学习9）-优快云博客

本文介绍了一个简单的 Android 应用示例，演示了如何为 ImageButton、EditText、CheckBox、RadioButton 和 ToggleButton 设置点击和按键监听器。通过这些监听器可以实现按钮点击反馈、输入框回车响应、复选框状态改变提示等功能。

HelloFormStuff .java 代码如下

package com.example.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.RadioButton;
import android.widget.Toast;
import android.widget.ToggleButton;

public class HelloFormStuff extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final ImageButton button = (ImageButton) findViewById(R.id.android_button);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on clicks
                Toast.makeText(HelloFormStuff.this, "Beep Bop", Toast.LENGTH_SHORT).show();
            }
        });
        
        final EditText edittext = (EditText) findViewById(R.id.edittext);
        edittext.setOnKeyListener(new View.OnKeyListener() {
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
                  // Perform action on key press
                  Toast.makeText(HelloFormStuff.this, edittext.getText(), Toast.LENGTH_SHORT).show();
                  return true;
                }
                return false;
            }
        });

        final CheckBox checkbox = (CheckBox) findViewById(R.id.checkbox);
        checkbox.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on clicks
                if (checkbox.isChecked()) {
                    Toast.makeText(HelloFormStuff.this, "Selected", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(HelloFormStuff.this, "Not selected", Toast.LENGTH_SHORT).show();
                }
            }
        });
        
        
        View.OnClickListener radio_listener = new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on clicks
                RadioButton rb = (RadioButton) v;
                Toast.makeText(HelloFormStuff.this, rb.getText(), Toast.LENGTH_SHORT).show();
            }
        };   
        
        final RadioButton radio_red = (RadioButton) findViewById(R.id.radio_red);
        final RadioButton radio_blue = (RadioButton) findViewById(R.id.radio_blue);
        
        radio_red.setOnClickListener(radio_listener);
        radio_blue.setOnClickListener(radio_listener);    
        
        final ToggleButton togglebutton = (ToggleButton) findViewById(R.id.togglebutton);
        togglebutton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on clicks
                if (togglebutton.isChecked()) {
                    Toast.makeText(HelloFormStuff.this, "ON", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(HelloFormStuff.this, "OFF", Toast.LENGTH_SHORT).show();
                }
            }
        });
        
        
        
    }
    
    
}

layout->main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

<ImageButton
    android:id="@+id/android_button"
    android:layout_width="100dip"
    android:layout_height="wrap_content"
    android:src="@drawable/android" />	

<EditText
    android:id="@+id/edittext"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/>

<CheckBox android:id="@+id/checkbox"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="check it out" />

<RadioGroup
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical">
  
  <RadioButton android:id="@+id/radio_red"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Red" />
  
  <RadioButton android:id="@+id/radio_blue"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Blue" />
  
</RadioGroup>

<ToggleButton android:id="@+id/togglebutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />


    	
</LinearLayout>

run it 结果如下：