Android小demo，两个button，控制多个输入框实现值自增自减。

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如图，使用两个按钮控制九个输入框实现自增自减。从0开始

简单的线性布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.tdgeos.demo.MainActivity" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:gravity="right" >        <Button             android:id="@+id/btn_increment"            android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="自增++"/>        <Button             android:id="@+id/btn_reduce"            android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="自减--"/>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <EditText             android:id="@+id/et_input1"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>        <EditText             android:id="@+id/et_input2"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>        <EditText             android:id="@+id/et_input3"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <EditText             android:id="@+id/et_input4"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>        <EditText             android:id="@+id/et_input5"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>        <EditText             android:id="@+id/et_input6"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <EditText             android:id="@+id/et_input7"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>        <EditText             android:id="@+id/et_input8"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>        <EditText             android:id="@+id/et_input9"            android:layout_width="0dp"            android:layout_weight="1"        android:layout_height="wrap_content"/>    </LinearLayout></LinearLayout>

代码思路：给每个输入框加选中监听，将自身控件id传给两个button，点击按钮时，调用自增自减方法。

package com.tdgeos.demo;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.text.InputType;import android.text.TextUtils;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.view.Window;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity implements OnClickListener {private Button btnIncrement = null;private Button btnReduce = null;private EditText etInput1;private EditText etInput2;private EditText etInput3;private EditText etInput4;private EditText etInput5;private EditText etInput6;private EditText etInput7;private EditText etInput8;private EditText etInput9;private List<EditText> list = new ArrayList<EditText>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);initWidget();}private int editId; // 记录选中的输入框的id// 初始化控件private void initWidget() {btnIncrement = (Button) findViewById(R.id.btn_increment);btnIncrement.setOnClickListener(this);btnReduce = (Button) findViewById(R.id.btn_reduce);btnReduce.setOnClickListener(this);etInput1 = (EditText) findViewById(R.id.et_input1);etInput2 = (EditText) findViewById(R.id.et_input2);etInput3 = (EditText) findViewById(R.id.et_input3);etInput4 = (EditText) findViewById(R.id.et_input4);etInput5 = (EditText) findViewById(R.id.et_input5);etInput6 = (EditText) findViewById(R.id.et_input6);etInput7 = (EditText) findViewById(R.id.et_input7);etInput8 = (EditText) findViewById(R.id.et_input8);etInput9 = (EditText) findViewById(R.id.et_input9);list.add(etInput1);list.add(etInput2);list.add(etInput3);list.add(etInput4);list.add(etInput5);list.add(etInput6);list.add(etInput7);list.add(etInput8);list.add(etInput9);// 遍历输入框，给每个EditText加选中监听。for (EditText input : list) {input.setInputType(InputType.TYPE_NULL);input.setOnFocusChangeListener(new OnFocusChangeListener() {@Overridepublic void onFocusChange(View v, boolean hasFocus) {if (hasFocus) {// 被选中时，得到该控件的id。editId = v.getId();}}});}}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btn_increment:addSelf(editId);break;case R.id.btn_reduce:reduceSelf(editId);break;default:break;}}// 自减运算，传入控件idpublic void reduceSelf(int id) {EditText etjj = (EditText) findViewById(id);String etjjStr = etjj.getText().toString().trim();int zhi = 0;if (!TextUtils.isEmpty(etjjStr)) {zhi = Integer.parseInt(etjjStr);} else {zhi = 0;}zhi = zhi - 1;if (zhi < 0) {zhi = 0;}etjj.setText(zhi + "");}// 自增运算，传入控件idpublic void addSelf(int id) {EditText etjj = (EditText) findViewById(id);String str = etjj.getText().toString().trim();int zhi = 0;if (!TextUtils.isEmpty(str)) {zhi = Integer.parseInt(str);} else {zhi = 0;}zhi = zhi + 1;etjj.setText(zhi + "");}}

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