1.功能
PopupWindow这个类用来实现一个弹出框，可以使用任意布局的View作为其内容，这个弹出框是悬浮在当前activity之上的，可以设置显示位置。
2.需求
弹出软键盘，实现键盘功能从而实现金额的标准显示
3.界面布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/keypad_dialog"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="4">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="1"
android:id="@+id/btn1"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="2"
android:id="@+id/btn2"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="3"
android:id="@+id/btn3"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="取消"
android:id="@+id/btn_cancel"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="4">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="4"
android:id="@+id/btn4"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="5"
android:id="@+id/btn5"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="6"
android:id="@+id/btn6"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="删除"
android:id="@+id/btn_delete"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="4">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="7"
android:id="@+id/btn7"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="000"
android:id="@+id/btn000"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="8"
android:id="@+id/btn8"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="00"
android:id="@+id/btn00"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="9"
android:id="@+id/btn9"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="0"
android:id="@+id/btn0"
android:layout_weight="1"
android:soundEffectsEnabled="true"/>
</LinearLayout>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="确定"
android:background="#00FF00"
android:id="@+id/btn_enter"
android:soundEffectsEnabled="true"/> </LinearLayout>
</LinearLayout
aaarticlea/png;base64,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" alt="" />
4.实现KeyPadDialog类以及键盘功能
为了显示金额，限定长度为12
public class KeyPadDialog extends PopupWindow implements View.OnClickListener{
private View parent;
private String str = "";
private Handler handler;
public KeyPadDialog(Context context, View parent,Handler hand){
super(context);
this.parent = parent;
handler = hand;
//set content view
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View contentView = layoutInflater.inflate(R.layout.keyboard, null);
setContentView(contentView);
//set width and height
setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
//在触摸到外部区域后也不会消失
setFocusable(false);
setTouchable(true);
setOutsideTouchable(false);
contentView.findViewById(R.id.btn1).setOnClickListener(this);
contentView.findViewById(R.id.btn2).setOnClickListener(this);
contentView.findViewById(R.id.btn3).setOnClickListener(this);
contentView.findViewById(R.id.btn4).setOnClickListener(this);
contentView.findViewById(R.id.btn5).setOnClickListener(this);
contentView.findViewById(R.id.btn6).setOnClickListener(this);
contentView.findViewById(R.id.btn7).setOnClickListener(this);
contentView.findViewById(R.id.btn8).setOnClickListener(this);
contentView.findViewById(R.id.btn9).setOnClickListener(this);
contentView.findViewById(R.id.btn0).setOnClickListener(this);
contentView.findViewById(R.id.btn00).setOnClickListener(this);
contentView.findViewById(R.id.btn000).setOnClickListener(this);
contentView.findViewById(R.id.btn_cancel).setOnClickListener(this);
contentView.findViewById(R.id.btn_delete).setOnClickListener(this);
contentView.findViewById(R.id.btn_enter).setOnClickListener(this);
}
public void show(){
// Show at bottom of parent
this.showAtLocation(parent, Gravity.BOTTOM,0,0);
Log.d("DialogTest","ShowDialog");
}
@Override
public void onClick(View v){
boolean isCancel = false;
switch (v.getId()){
case R.id.btn1:
if(str.length() < 12){
str = str + String.valueOf(1);
}
break;
case R.id.btn2:
if(str.length() < 12){
str = str + String.valueOf(2);
}
break;
case R.id.btn3:
if(str.length() < 12){
str = str + String.valueOf(3);
}
break;
case R.id.btn4:
if(str.length() < 12){
str = str + String.valueOf(4);
}
break;
case R.id.btn5:
if(str.length() < 12){
str = str + String.valueOf(5);
}
break;
case R.id.btn6:
if(str.length() < 12){
str = str + String.valueOf(6);
}
break;
case R.id.btn7:
if(str.length() < 12){
str = str + String.valueOf(7);
}
break;
case R.id.btn8:
if(str.length() < 12){
str = str + String.valueOf(8);
}
break;
case R.id.btn9:
if(str.length() < 12){
str = str + String.valueOf(9);
}
break;
case R.id.btn0:
if ((str.length() != 0) && (str.length() < 12)) {
str = str + "0";
}
break;
case R.id.btn00:
if ((str.length() != 0) && (str.length() < 11)) {
str = str + "00";
}
break;
case R.id.btn000:
if ((str.length() != 0) && (str.length() < 10)) {
str = str + "000";
}
break;
case R.id.btn_cancel:
str = "";
break;
case R.id.btn_delete:
if (str.length() != 0) {
str = str.substring(0,str.length()-1);
}
break;
case R.id.btn_enter:
Message msg = new Message().obtain();
msg.what = 2;
handler.sendMessage(msg);
break;
default:
break;
}
Message msg = new Message().obtain();
msg.what = 1;
msg.obj = str;
handler.sendMessage(msg);
}
}
5.实现MainActivity
必须在主界面加载完后才能弹出软键盘
public class MainActivity extends Activity implements View.OnClickListener{
private View mView;
KeyPadDialog dialog;
private EditText editMoney;
private Button button_scan;
private Button button_card;
private String money = "";
private Handler handler = new Handler(){
public void handleMessage(Message msg){
switch (msg.what){
case 0:
Toast.makeText(MainActivity.this,msg.obj.toString(),Toast.LENGTH_LONG).show();
break;
case 1:
updateMoney(msg.obj.toString());
break;
case 2:
if (money.length() != 0 ){
Intent intent = new Intent(MainActivity.this,SaleActivity.class);
Bundle bundle = new Bundle();
bundle.putCharSequence("money",money);
intent.putExtras(bundle);
startActivity(intent);
}
break;
default:
break;
}
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mView = layoutInflater.inflate(
R.layout.activity_main, null);
setContentView(mView);
editMoney = (EditText)findViewById(R.id.inputmoney);
editMoney.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
dialog = new KeyPadDialog(MainActivity.this,mView,handler);
dialog.show();
return true;
}
});
button_scan = (Button)findViewById(R.id.btn_scan);
button_card = (Button)findViewById(R.id.btn_card);
button_scan.setOnClickListener(this);
button_card.setOnClickListener(this);
}
@Override
public void onClick(View v){
switch (v.getId()){
case R.id.btn_scan:
break;
case R.id.btn_card:
break;
default:
break;
}
}
//金额的标准显示（带“，”和两位小数）
public void updateMoney(String str){
if (str.length() == 0){
editMoney.setText("$0.00");
return;
}
if(str.length() > 12){
return;
}
if (str.length() == 1){
money = "$"+"0.0" + str.substring(0);
}
if (str.length() == 2){
money = "$"+"0." + str.substring(0,str.length());
}
if ((str.length() > 2) && (str.length() <= 5)){
money = "$"+str.substring(0,str.length()-2) + "." + str.substring(str.length()-2);
}
if ((str.length() > 5) && (str.length() <= 8)){
money = "$"+str.substring(0,str.length()-5) +","+str.substring(str.length()-5,str.length()-2) +"." + str.substring(str.length()-2);
}
if ((str.length() > 8) && (str.length() <= 11)){
money = "$"+str.substring(0,str.length()-8) +","+str.substring(str.length()-8,str.length()-5)+","+str.substring(str.length()-5,str.length()-2) +"." + str.substring(str.length()-2);
}
if (str.length() == 12){
money = "$"+str.substring(0,1) +","+str.substring(1,str.length()-8) +","+str.substring(str.length()-8,str.length()-5)+","+str.substring(str.length()-5,str.length()-2) +"." + str.substring(str.length()-2);
}
editMoney.setText(money);
}
}