Android(安卓)之 CheckBox

CheckBox，也就是多项选择。Android中提供了ChechBox控件，使用起来非常方便。这里还是老规矩，用一个Demo来演示。

1：新建一个工程：CheckBoxDemo

2:布局文件如下：

<?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" > <TextView android:text="@+id/TextView01" android:id="@+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView> <CheckBox android:text="@+id/CheckBox01" android:id="@+id/CheckBox01" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox> <CheckBox android:text="@+id/CheckBox02" android:id="@+id/CheckBox02" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox> <CheckBox android:text="@+id/CheckBox03" android:id="@+id/CheckBox03" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox> <CheckBox android:text="@+id/CheckBox04" android:id="@+id/CheckBox04" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox> <Button android:text="@+id/Button01" android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> </LinearLayout>

3:源代码如下：这种是常见的一种表达形式。

package com.rocky.studio.ch426; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.TextView; import android.widget.Toast; public class CheckBoxDemo extends Activity { private TextView m_txtView; private CheckBox m_CheckBox1; private CheckBox m_CheckBox2; private CheckBox m_CheckBox3; private CheckBox m_CheckBox4; private Button m_Button; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); m_txtView=(TextView)this.findViewById(R.id.TextView01); m_CheckBox1=(CheckBox)this.findViewById(R.id.CheckBox01); m_CheckBox2=(CheckBox)this.findViewById(R.id.CheckBox02); m_CheckBox3=(CheckBox)this.findViewById(R.id.CheckBox03); m_CheckBox4=(CheckBox)this.findViewById(R.id.CheckBox04); m_txtView.setText("调查：你喜欢Android是因为什么原因？"); m_CheckBox1.setText("好看"); m_CheckBox2.setText("好用"); m_CheckBox3.setText("免费"); m_CheckBox4.setText("应用广泛"); m_CheckBox1.setOnCheckedChangeListener(m_checkboxListener); m_CheckBox2.setOnCheckedChangeListener(m_checkboxListener); m_CheckBox3.setOnCheckedChangeListener(m_checkboxListener); m_CheckBox4.setOnCheckedChangeListener(m_checkboxListener); m_Button=(Button)this.findViewById(R.id.Button01); m_Button.setOnClickListener(m_BtnListener); m_Button.setText("提交"); } private OnClickListener m_BtnListener=new OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub if(arg0.getId()==R.id.Button01) { int value=0; if(m_CheckBox1.isChecked()) { value++; } if(m_CheckBox2.isChecked()) { value++; } if(m_CheckBox3.isChecked()) { value++; } if(m_CheckBox4.isChecked()) { value++; } Toast.makeText(getBaseContext(), "你选择了 "+value+"项", Toast.LENGTH_SHORT).show(); } } }; private CheckBox.OnCheckedChangeListener m_checkboxListener =new CheckBox.OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub if(buttonView.getId()==R.id.CheckBox01) { if(isChecked) { Toast.makeText(getBaseContext(), "CheckBox 01 check ", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getBaseContext(), "CheckBox 01 ucheck ", Toast.LENGTH_SHORT).show(); } } if(buttonView.getId()==R.id.CheckBox02) { if(isChecked) { Toast.makeText(getBaseContext(), "CheckBox 02 check ", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getBaseContext(), "CheckBox 02 ucheck ", Toast.LENGTH_SHORT).show(); } } if(buttonView.getId()==R.id.CheckBox03) { if(isChecked) { Toast.makeText(getBaseContext(), "CheckBox 03 check ", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getBaseContext(), "CheckBox 03 ucheck ", Toast.LENGTH_SHORT).show(); } } if(buttonView.getId()==R.id.CheckBox04) { if(isChecked) { Toast.makeText(getBaseContext(), "CheckBox 04 check ", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getBaseContext(), "CheckBox 04 ucheck ", Toast.LENGTH_SHORT).show(); } } } }; }

4：代码简单，但是实际操作一篇还是有益处的。

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