Android Checkbox Example
1. Custom String
打开 “res/values/strings.xml” 文件,
File : res/values/strings.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">CheckBoxDemo</string> <string name="action_settings">Settings</string> <string name="hello_world">Hello world!</string> <string name="chk_ios">IPhone</string> <string name="chk_android">Android</string> <string name="chk_windows">Windows Mobile</string> <string name="btn_display">Display</string> </resources>
2. CheckBox
打开 “res/layout/activity_main.xml” 文件,
File : res/layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <CheckBox android:id="@+id/chkIos" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/chk_ios" /> <CheckBox android:id="@+id/chkAndroid" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/chk_android" android:checked="true" /> <CheckBox android:id="@+id/chkWindows" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/chk_windows" /> <Button android:id="@+id/btnDisplay" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/btn_display" /> </LinearLayout>
注: android:checked="true" 表示默认选中。本例子中,chkAndroid默认选中
3. Code Code
package com.jiangge.checkboxdemo; 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.Toast; public class MainActivity extends Activity { private CheckBox chkIos, chkAndroid, chkWindows; private Button btnDisplay; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); addListenerOnChkIos(); addListenerOnButton(); } private void addListenerOnChkIos() { chkIos = (CheckBox) findViewById(R.id.chkIos); chkIos.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // chkIos 是否被选中 if (((CheckBox)v).isChecked()) { Toast.makeText(getApplicationContext(), "Bro try android,哈哈",Toast.LENGTH_LONG).show(); } } }); } private void addListenerOnButton() { chkIos = (CheckBox) findViewById(R.id.chkIos); chkAndroid = (CheckBox) findViewById(R.id.chkAndroid); chkWindows = (CheckBox) findViewById(R.id.chkWindows); btnDisplay = (Button) findViewById(R.id.btnDisplay); btnDisplay.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { StringBuffer result = new StringBuffer(); result.append("IPhone check : ").append(chkIos.isChecked()); result.append("\nAndroid check : ").append(chkAndroid.isChecked()); result.append("\nWindows Mobile check :").append(chkWindows.isChecked()); Toast.makeText(MainActivity.this, result.toString(), Toast.LENGTH_LONG).show(); } }); } }
注:
if (((CheckBox)v).isChecked()) 向下转型。
StringBuffer result = new StringBuffer();
result .append().append()
4、运行结果:
一启动时的运行结果:
选中 IPhone (和Android)的运行结果:
选中IPone 和 Winows Mobile,然后点击 Button 按钮的运行结果: