android————Button
首先我们介绍一下SeekBar，即使拖动滑条，比如控制声音
单选按钮的使用
public class SeekBarActivity extends Activity implements OnSeekBarChangeListener{
private TextView textView1,textView2;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.seekbar);
textView1=(TextView) findViewById(R.id.seektext1);
textView2=(TextView) findViewById(R.id.seektext2);
SeekBar seekBar1=(SeekBar) findViewById(R.id.seekbar1);
SeekBar seekBar2=(SeekBar) findViewById(R.id.seekbar2);
seekBar1.setOnSeekBarChangeListener(this);
seekBar2.setOnSeekBarChangeListener(this);
}
//当滑动滑竿是触发的事件
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
if(seekBar.getId()==R.id.seekbar1){
textView1.setText("seekBar1的当前位置是:"+progress);
}else{
textView2.setText("seekBar2的当前位置是:"+progress);
}
}
//表示从哪里开始拖动
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
if(seekBar.getId()==R.id.seekbar1){
textView1.setText("seekBar1的开始拖动");
}else{
textView2.setText("seekBar2的开始拖动");
}
}
//表示从哪里结束拖动
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
if(seekBar.getId()==R.id.seekbar1){
textView1.setText("seekBar1的停止拖动");
}else{
textView2.setText("seekBar2的停止拖动");
}
}
}下面是button的各种按键事件： OnClickListener,OnFocusChangeListener,OnTouchListener,OnKeyListener
public class ButtonChanage extends Activity implements OnClickListener,OnFocusChangeListener,OnTouchListener,OnKeyListener{
private Button commonButton;
private Button imageButton;
private int value=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.buttonchage);
commonButton=(Button) findViewById(R.id.btn_chang1);
imageButton=(Button) findViewById(R.id.btn_chang2);
//单击按下的效果
commonButton.setOnClickListener(this);
imageButton.setOnClickListener(this);
//显示屏触摸的动作
imageButton.setOnTouchListener(this);
//焦点变化
imageButton.setOnFocusChangeListener(this);
//按钮按上或者按下
imageButton.setOnKeyListener(this);
}
@Override
public void onClick(View v) {
Button button=(Button) v;
if(value==1&&button.getWidth()==getWindowManager().getDefaultDisplay().getWidth()){
value=-1;
}else if(value==-1&&button.getWidth()<100){
value=1;
}
button.setWidth(button.getWidth()+(int)(button.getWidth()*0.1)*value);
button.setHeight(button.getHeight()+(int)(button.getHeight()*0.1)*value);
}
@Override
public boolean onKey(View v, int arg1, KeyEvent event) {
if(KeyEvent.ACTION_DOWN==event.getAction()){
v.setBackgroundResource(R.drawable.button2);
}else if(KeyEvent.ACTION_UP==event.getAction()){
v.setBackgroundResource(R.drawable.button3);
}
return false;
}
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus){
imageButton.setBackgroundResource(R.drawable.button2);
}else{
imageButton.setBackgroundResource(R.drawable.button1);
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_UP){
v.setBackgroundResource(R.drawable.button1);
}else if(event.getAction()==MotionEvent.ACTION_DOWN){
v.setBackgroundResource(R.drawable.button2);
}
return false;
}
}
下面是在按钮上加图片
public class ButtonImage extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.buttoniamge);
Button button = (Button) findViewById(R.id.btn_imgbtn);
SpannableString spannedStringLeft = new SpannableString("left");
Bitmap bitmapLeft = BitmapFactory.decodeResource(getResources(),
R.drawable.face4);
ImageSpan imageSpanLeft = new ImageSpan(bitmapLeft,
DynamicDrawableSpan.ALIGN_BOTTOM);
spannedStringLeft.setSpan(imageSpanLeft, 0, 4,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
SpannableString spannableStringRight = new SpannableString("right");
Bitmap bitmapright = BitmapFactory.decodeResource(getResources(),
R.drawable.face1);
ImageSpan imageRight = new ImageSpan(bitmapright);
spannableStringRight.setSpan(imageRight, 0, 5,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
button.append(spannedStringLeft);
button.append("我的按钮");
button.append(spannableStringRight);
}
}
单选按钮的使用
public class RadioButton extends Activity {
private RadioGroup radioGroup;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.radiobutton);
button=(Button) findViewById(R.id.radbutton);
radioGroup=(RadioGroup) findViewById(R.id.sex);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
int len=radioGroup.getChildCount();
String msgString="";
for(int i=0;i动态多选按钮；；；；；
public class CheckActivity extends Activity implements OnClickListener {
List checkBoxs=new ArrayList();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//setContentView(R.layout.check);
String[] checkboxText=new String[]{"你是中国人吗？","你是美国人吗？","你喜欢旅游吗？","你是程序员吗？"};
// 动态加载布局
LinearLayout linearLayout=(LinearLayout) getLayoutInflater().inflate(R.layout.check, null);
for(int i=0;i
public class KaiGuanActivity extends Activity {
private ToggleButton button;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.kg);
button=(ToggleButton) findViewById(R.id.togglebutton);
final LinearLayout linearLayout=(LinearLayout) findViewById(R.id.linear);
button.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
// TODO Auto-generated method stub
if (isChecked) {
linearLayout.setOrientation(1);
}else
{
linearLayout.setOrientation(0);
}
}
});
}
}