除了最常用的TextView,Android还提供了一些其他的基本控件。
- Button
- ImageButton
- EditText
- CheckBox
- RadioGroup和RadioButton
- ToggleButton
下面的例子,展示如何使用这些基本控件。
1、创建一个工程:BasicViews。
2、main.xml中的代码。
<?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" > <Button android:id="@+id/btnSave" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/save" android:onClick="btnSaved_clicked"/> <Button android:id="@+id/btnOpen" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Open" /> <ImageButton android:id="@+id/btnImg1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:src="@drawable/ic_launcher" /> <EditText android:id="@+id/txtName" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <CheckBox android:id="@+id/chkAutosave" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Autosave" /> <CheckBox android:id="@+id/star" style="?android:attr/starStyle" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <RadioGroup android:id="@+id/rdbGp1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" > <RadioButton android:id="@+id/rdb1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Option 1" /> <RadioButton android:id="@+id/rdb2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Option 2" /> </RadioGroup> <ToggleButton android:id="@+id/toggle1" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>3、F11调试。4、点击不同的控件,观察不同的效果。
5、对事件进行处理。
package net.learn2develop.BasicViews1;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;
import android.widget.ToggleButton;
public class BasicViews1Activity extends Activity {
public void btnSaved_clicked (View view) {
DisplayToast("You have clicked the Save button1");
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//---Button view---
Button btnOpen = (Button) findViewById(R.id.btnOpen);
btnOpen.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
DisplayToast("You have clicked the Open button");
}
});
/*
//---Button view---
Button btnSave = (Button) findViewById(R.id.btnSave);
btnSave.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
DisplayToast("You have clicked the Save button");
}
});
*/
//---CheckBox---
CheckBox checkBox = (CheckBox) findViewById(R.id.chkAutosave);
checkBox.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
if (((CheckBox)v).isChecked())
DisplayToast("CheckBox is checked");
else
DisplayToast("CheckBox is unchecked");
}
});
//---RadioButton---
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.rdbGp1);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton rb1 = (RadioButton) findViewById(R.id.rdb1);
if (rb1.isChecked()) {
DisplayToast("Option 1 checked!");
} else {
DisplayToast("Option 2 checked!");
}
}
});
//---ToggleButton---
ToggleButton toggleButton =
(ToggleButton) findViewById(R.id.toggle1);
toggleButton.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
if (((ToggleButton)v).isChecked())
DisplayToast("Toggle button is On");
else
DisplayToast("Toggle button is Off");
}
});
}
private void DisplayToast(String msg)
{
Toast.makeText(getBaseContext(), msg,
Toast.LENGTH_SHORT).show();
}
}