购物类数字选择器

第一步、布局文件

<?xml version="1.0" encoding="utf-8"?>
<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="horizontal">

    <LinearLayout
        android:layout_width="150dp"
        android:layout_height="40dp">

        <TextView
            android:id="@+id/num_desc_textview"
            android:layout_width="45dp"
            android:layout_height="match_parent"
            android:layout_gravity="left"
            android:background="@drawable/jian"
            android:gravity="center"
            android:padding="10dp" />

        <EditText
            android:id="@+id/num_textview"
            android:layout_width="60dp"
            android:layout_height="match_parent"
            android:layout_gravity="center_horizontal"
            android:background="@drawable/shuzi"
            android:gravity="center"
            android:inputType="number"
            android:padding="10dp"
            android:singleLine="true"
            android:text="0" />

        <TextView
            android:id="@+id/num_add_textview"
            android:layout_width="45dp"
            android:layout_height="match_parent"
            android:layout_gravity="right"
            android:background="@drawable/jia"
            android:gravity="center"
            android:padding="10dp" />

    </LinearLayout>


</LinearLayout>

第二步、java代码

package com.bruce.testaddview;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity implements View.OnClickListener {

    private TextView mDescTextView, mAddTextView;
    private EditText mNumEdit;
    private int num = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mains);
        mDescTextView = (TextView) findViewById(R.id.num_desc_textview);
        mAddTextView = (TextView) findViewById(R.id.num_add_textview);
        mNumEdit = (EditText) findViewById(R.id.num_textview);
        mDescTextView.setOnClickListener(this);
        mAddTextView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        String str = mNumEdit.getText().toString();
        if (str == null || "".equals(str)) {
            num = 0;
        } else {
            num = Integer.parseInt(str);
        }
        switch (v.getId()) {
            case R.id.num_add_textview:

                num++;

                mNumEdit.setText(String.valueOf(num));
                break;
            case R.id.num_desc_textview:
                num--;
                if (num <= 0) {
                    num = 0;
                }
                mNumEdit.setText(String.valueOf(num));
                break;
        }
        num = Integer.parseInt(mNumEdit.getText().toString());
        Log.w("tag", "<>" + num);
    }
}

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