我在我的活动中有两个EditText和一个TextView，我想多个都是edittext值的东西是当用户输入任何edittext的值时，相应的textView值应该改变。我的代码如下：
EDITTEXTS：数量，价格 的TextView：tv_subtotal
main.java
package com.epe.yehki.ui;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.epe.yehki.util.Const;
import com.epe.yehki.util.Pref;
import com.epe.yehki.util.Utils;
import com.example.yehki.R;
public class PlaceOrderActivity extends ListActivity {
Button confirm, shipping;
RelativeLayout rl_adress;
TextView product_name;
TextView tv_adress;
TextView tv_select_adres;
EditText qty;
EditText price;
TextView tv_subtotal;
TextView tv_total;
ArrayAdapter<String> adapter;
String method;
ImageView back;
Double total, subtotal, min_qty, min_agree_prc, max_agree_prc, min_agree_qty, Max_agree_qty, min_qty_unit_name, max_price, min_price;
Intent i = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_place_order);
final ListView lv = getListView();
System.out.println("::::::::::::my custome Id inside ::::::::::place order" + Pref.getValue(PlaceOrderActivity.this, Const.PREF_CUSTOMER_ID, ""));
// FINDINLG IDS...!!
qty = (EditText) findViewById(R.id.et_qty);
price = (EditText) findViewById(R.id.et_price);
rl_adress = (RelativeLayout) findViewById(R.id.btn_adress);
product_name = (TextView) findViewById(R.id.tv_product_name);
tv_adress = (TextView) findViewById(R.id.tv_adress);
tv_select_adres = (TextView) findViewById(R.id.tv_select_adress);
tv_total = (TextView) findViewById(R.id.tv_total);
tv_subtotal = (TextView) findViewById(R.id.tv_subtotal);
back = (ImageView) findViewById(R.id.iv_back);
qty.setCursorVisible(false);
price.setCursorVisible(false);
lv.setVisibility(View.GONE);
String[] shipMethods = new String[] { "Sea Freight", "Air Cargo", "Express" };
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, shipMethods);
shipping = (Button) findViewById(R.id.btn_shiping_method);
shipping.setText("Select shipping Method");
if (Pref.getValue(PlaceOrderActivity.this, Const.FLAG_ADDRESS, "").equals("")) {
max_agree_prc = Double.parseDouble(i.getStringExtra(Const.TAG_PRODUCT_AGREE_MAX_PRICE));
min_agree_prc = Double.parseDouble(i.getStringExtra(Const.TAG_PRODUCT_AGREE_MIN_PRICE));
Max_agree_qty = Double.parseDouble(i.getStringExtra(Const.TAG_PRODUCT_AGREE_MAX_QTY));
min_agree_qty = Double.parseDouble(i.getStringExtra(Const.TAG_PRODUCT_AGREE_MIN_QTY));
min_qty = Double.parseDouble(i.getStringExtra(Const.TAG_PRODUCT_MIN_ORDER_QTY));
min_qty_unit_name = Double.parseDouble(i.getStringExtra(Const.TAG_PRODUCT_MIN_ORDER_QTY_UNIT_NAME));
max_price = Double.parseDouble(i.getStringExtra(Const.TAG_PRODUCT_MAX_PRICE));
min_price = Double.parseDouble(i.getStringExtra(Const.TAG_PRODUCT_MIN_PRICE));
product_name.setText(getIntent().getStringExtra(Const.TAG_PRODUCT_NAME));
}
qty.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
qty.setCursorVisible(true);
}
});
price.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
price.setCursorVisible(true);
}
});
// SELECT ADDRESS CLICK EVENT..!
rl_adress.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
i = new Intent(PlaceOrderActivity.this, AddressListActivity.class);
startActivity(i);
}
});
shipping.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
setListAdapter(adapter);
lv.setVisibility(View.VISIBLE);
}
});
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
method = (String) getListAdapter().getItem(position);
shipping.setText(method);
i.putExtra("shipping", method);
lv.setVisibility(View.GONE);
}
});
back.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
confirm.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Checking for quantity and price...!!!
if (Integer.parseInt(qty.getText().toString()) >= min_qty) {
// check for quantity range
if (Integer.parseInt(price.getText().toString()) >= min_price && Integer.parseInt(price.getText().toString()) <= max_price) {
// check for price range
} else {
Utils.showCustomeAlertValidation(PlaceOrderActivity.this, "Enter Price in Range", "ALERT", "OK");
}
} else {
Utils.showCustomeAlertValidation(PlaceOrderActivity.this, "Enter Quantity in Range", "ALERT", "OK");
}
}
});
}
private void calculate() {
// TODO Auto-generated method stub
double QuantyInt = 1;
double PriceInt = 0;
if (qty != null)
QuantyInt = Double.parseDouble(qty.getText().toString());
if (price != null)
PriceInt = Double.parseDouble(price.getText().toString());
subtotal = (QuantyInt * PriceInt);
String textResult = "Your BMI is " + subtotal;
tv_subtotal.setText(textResult);
tv_total.setText(textResult);
}
}