android基础--系统控件
1.文本框TextViewTextView
1.1通过代码呈现
public class TextViewActivity extends Activity
{
@Overrideprotected
void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.textview);
LinearLayout ll = (LinearLayout) findViewById(R.id.textviewll);
TextView textView = new TextView(this);//设置显示文字
textView.setText("从代码中添加一个TextView");//设置显示颜色
textView.setTextColor(Color.WHITE);//设置显示字体大小
textView.setTextSize(18);//设置显示背景颜色
textView.setBackgroundColor(Color.BLUE);//设置锚点位置
textView.setGravity(Gravity.CENTER_VERTICAL¦Gravity.CENTER_HORIZONTAL);
//把这个view加入到布局当中ll.addView(textView);
super.onCreate(savedInstanceState);
}
}
1.2通过xml布局文件呈现
android="http://schemas.android.com/apk/res/android" android:id="@+id/textviewll" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> android:id="@+id/textView0" android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" android:textSize="18dip" android:background="#00FF00" android:text="@string/textView" android:gravity="center_vertical¦center_horizontal" />
2.网页框WebView
| public class WebViewActivity extends Activity { WebView webView = null; static final String MIME_TYPE = "text/html"; static final String ENCODING = "utf-8"; @Override protected void onCreate(Bundle savedInstanceState) { setContentView(R.layout.webview); webView = (WebView) findViewById(R.id.webview); webView.loadDataWithBaseURL(null,"欢迎访问", MIME_TYPE, ENCODING, null); super.onCreate(savedInstanceState); } }
Xml布局： android:id="@+id/textviewll" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" android:textSize="18dip" android:background="#00FF00" android:text="网页框WebView测试" android:gravity="center_vertical¦center_horizontal" /> android:id="@+id/webview" android:layout_height="wrap_content" android:layout_width="match_parent" /> |
3.Menu菜单
public class MenuActivity extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.menuview);
super.onCreate(savedInstanceState);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(0, 0, Menu.NONE, "菜单1").setIcon(R.drawable.icon);
menu.add(0, 1, Menu.NONE, "菜单2").setIcon(R.drawable.icon);
menu.add(0, 2, Menu.NONE, "菜单3").setIcon(R.drawable.icon);
menu.add(0, 3, Menu.NONE, "菜单4").setIcon(R.drawable.icon);
menu.add(0, 4, Menu.NONE, "菜单5").setIcon(R.drawable.icon);
menu.add(0, 5, Menu.NONE, "菜单6").setIcon(R.drawable.icon);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
Dialog(item.getItemId());
return super.onOptionsItemSelected(item);
}
private void Dialog(int message)
{
new AlertDialog.Builder(this).setMessage("您单击第【" + message + "】项Menu菜单项.").show();
}
}
Xml布局：
android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" > android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" android:textSize="18dip" android:background="#00FF00" android:text="Menu菜单测试" android:gravity="center_vertical¦center_horizontal" />
4.按钮Button
public class ButtonActivity extends Activity
{
Context mContext = null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.buttonview);
mContext = this; //普通按钮
Button button0 = (Button)findViewById(R.id.buttonview0); //设置按钮文字颜色
button0.setTextColor(Color.BLUE); //设置按钮文字大小
button0.setTextSize(30); //设置按钮监听 点击事件
button0.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0) {
Toast.makeText(ButtonActivity.this, "您点击了‘这是一个按钮’", Toast.LENGTH_LONG).show();
}
}); //带图片的按钮
ImageButton button1 = (ImageButton)findViewById(R.id.buttonview1); //设置按钮监听 点击事件 button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0)
{
Toast.makeText(ButtonActivity.this, "您点击了一个带图片的按钮", Toast.LENGTH_LONG).show();
}
});
super.onCreate(savedInstanceState);
}
}
XML布局：
android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" android:textSize="18dip" android:background="#00FF00" android:text="Button按钮测试" android:gravity="center_vertical¦center_horizontal" /> android:id="@+id/buttonview0" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="这是一个按钮" /> android:id="@+id/buttonview1" android:layout_width="match_parent" android:layout_height="wrap_content" android:src="@drawable/icon" />
5.编辑框EditView
public class EditTextActivity extends Activity
{
Context mContext = null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.editview);
mContext = this;//帐号
final EditText editText0 = (EditText)findViewById(R.id.editview0);//密码
final EditText editText1 = (EditText)findViewById(R.id.editview1);//确认按钮
Button button = (Button)findViewById(R.id.editbutton0);
button.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
String username = editText0.getText().toString();
String password = editText1.getText().toString();
Toast.makeText(EditTextActivity.this, "用户名："+username +"密码："+ password, Toast.LENGTH_LONG).show();}});super.onCreate(savedInstanceState);
}
}
XML布局：
android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" android:textSize="18dip" android:background="#00FF00" android:text="EditText编辑框测试" android:gravity="center_vertical¦center_horizontal" /> android:id="@+id/editview0" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入帐号" android:phoneNumber="true" /> android:id="@+id/editview1" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入密码" android:password="true" /> android:id="@+id/editbutton0" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="确定" />
6.单项选择
public class RadioActivity extends Activity
{
Context mContext = null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.radioview);
mContext = this;//单选组(只有在一个组中的按钮可以单选)
RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radion0);//单选按钮（第一组）
final RadioButton radioButton0 = (RadioButton)findViewById(R.id.radionButton0);
final RadioButton radioButton1 = (RadioButton)findViewById(R.id.radionButton1);
final RadioButton radioButton2 = (RadioButton)findViewById(R.id.radionButton2);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(RadioGroup arg0, int checkID)
{
if(radioButton0.getId() == checkID)
{
Toast.makeText(RadioActivity.this, "您选中了第一组" + radioButton0.getText(), Toast.LENGTH_LONG).show();
}else if(radioButton1.getId() == checkID)
{
Toast.makeText(RadioActivity.this, "您选中了第一组" + radioButton1.getText(), Toast.LENGTH_LONG).show();
}else if(radioButton2.getId() == checkID)
{
Toast.makeText(RadioActivity.this, "您选中了第一组" + radioButton2.getText(), Toast.LENGTH_LONG).show();
}
}
});
RadioGroup radioGroup0 = (RadioGroup)findViewById(R.id.radion1);//单选按钮(第二组)
final RadioButton radioButton3 = (RadioButton)findViewById(R.id.radionButton3);
final RadioButton radioButton4 = (RadioButton)findViewById(R.id.radionButton4);
final RadioButton radioButton5 = (RadioButton)findViewById(R.id.radionButton5);
radioGroup0.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(RadioGroup arg0, int checkID)
{
if(radioButton3.getId() == checkID)
{
Toast.makeText(RadioActivity.this, "您选中了第二组" + radioButton3.getText(), Toast.LENGTH_LONG).show();
}else if(radioButton4.getId() == checkID)
{
Toast.makeText(RadioActivity.this, "您选中了第二组" + radioButton4.getText(), Toast.LENGTH_LONG).show();
}else if(radioButton5.getId() == checkID)
{
Toast.makeText(RadioActivity.this, "您选中了第二组" + radioButton5.getText(), Toast.LENGTH_LONG).show();}}});super.onCreate(savedInstanceState);
}
}
XML布局：
android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" android:textSize="18dip" android:background="#00FF00" android:text="单项选择测试第一组" android:gravity="center_vertical¦center_horizontal" /> android:id="@+id/radion0" android:layout_width="match_parent" android:layout_height="wrap_content" > android:id="@+id/radionButton0" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item0" /> android:id="@+id/radionButton1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item1" /> android:id="@+id/radionButton2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item2" /> android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" android:textSize="18dip" android:background="#00FF00" android:text="单项选择测试第二组" android:gravity="center_vertical¦center_horizontal" /> android:id="@+id/radion1" android:layout_width="match_parent" android:layout_height="wrap_content" > android:id="@+id/radionButton3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item3" /> android:id="@+id/radionButton4" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item4" /> android:id="@+id/radionButton5" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item5" />
7.多项选择使用系统控件Checkbox
public class CheckboxActivity extends Activity
{
//用来储存选中的内容
ArrayListitem = new ArrayList();
@Override
protected void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.checkboxview);
CheckBox checkbox0 = (CheckBox)findViewById(R.id.checkboxview0);
CheckBox checkbox1 = (CheckBox)findViewById(R.id.checkboxview1);
CheckBox checkbox2 = (CheckBox)findViewById(R.id.checkboxview2);
CheckBox checkbox3 = (CheckBox)findViewById(R.id.checkboxview3);
Button button = (Button)findViewById(R.id.checkboxbutton);//对checkbox进行监听
checkbox0.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton button, boolean arg1)
{
String str = button.getText().toString();
if (button.isChecked()) {item.add(str);}
else {item.remove(str);}
}
});
checkbox1.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton button, boolean arg1)
{
String str = button.getText().toString();
if (button.isChecked()) {item.add(str);}
else {item.remove(str);}
}
});
checkbox2.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton button, boolean arg1)
{
String str = button.getText().toString();
if (button.isChecked()) {item.add(str);}
else {item.remove(str);}
}
});
checkbox3.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton button, boolean arg1)
{
String str = button.getText().toString();
if (button.isChecked()) {item.add(str);}
else {item.remove(str);}
}
});
button.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
String str = item.toString();
Toast.makeText(CheckboxActivity.this, "您选中了" + str, Toast.LENGTH_LONG).show();}});super.onCreate(savedInstanceState);
}
}
XML布局：
android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" android:textSize="18dip" android:background="#00FF00" android:text="多项选择测试" android:gravity="center_vertical¦center_horizontal" /> android:id="@+id/checkboxview0" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item0" /> android:id="@+id/checkboxview1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item1" /> android:id="@+id/checkboxview2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item2" /> android:id="@+id/checkboxview3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="item3" /> android:id="@+id/checkboxbutton" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="确定" />
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