【Android】自定义View —— 数字加减
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【关键词】
自定义View
数字
【问题】
- 给定最大值和最小值,点击“向上”按钮增加数字,点击“向下”按钮减少数字,超过最大值或最小值循环显示;
- 长按按钮,开始自增或自减;
- 非长按状态下拖动一定距离开始自增或自减;
- 可以获取当前值;
【效果图】
【解决方案】
- 见下面源代码;
【代码】
用法
xml
<com.lyloou.android.view.NumView
android:id="@+id/nv"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
activity
// 初始化
NumView nv = (NumView) findViewById(R.id.nv);
nv.init(0, 30, 0, true); // init(int minNum, int maxNum, int defaultNum, boolean cycleable);
// 获取当前值
nv.getNum();
// 设置值
nv.setNum(15);
源码
import java.text.DecimalFormat;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.lyloou.android.R;
/**
* @author Lyloou
* use it?
* [xml]
<com.lyloou.android.view.NumView
android:id="@+id/nv"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
*
* [activity]
NumView nv = (NumView) findViewById(R.id.nv);
nv.init(0, 30, 0, true);
*
*/
public class NumView extends LinearLayout {
private ImageView mIvAdd;
private ImageView mIvReduce;
private TextView mTvNum;
// 不要设置成静态的,每一个NumView,都应该有一个最大值和最小值;
private int mMaxNum;
private int mMinNum;
// 是否循环
private boolean mCycleable;
public NumView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView(context);
}
public NumView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public NumView(Context context) {
super(context, null);
}
public int getMaxNum() {
return mMaxNum;
}
public void setMaxNum(int maxNum) {
mMaxNum = maxNum;
}
public int getMinNum() {
return mMinNum;
}
public void setMinNum(int minNum) {
mMinNum = minNum;
}
public boolean isCycleable() {
return mCycleable;
}
public void setCycleable(boolean cycleable) {
mCycleable = cycleable;
}
private void initData() {
// initial
init(0, 0, 0, false);
}
/**
*
* @param minNum the min number in the field;
* @param maxNum the max number in the field;
* @param defaultNum the default number to show;
* @param cycleable is or not cycle;
*/
public void init(int minNum, int maxNum, int defaultNum, boolean cycleable) {
setMinNum(minNum);
setMaxNum(maxNum);
setCycleable(cycleable);
setNum(defaultNum);
}
private void initView(Context context) {
initData();
View view = View.inflate(context, R.layout.view_num, this);
mIvAdd = (ImageView) view.findViewById(R.id.iv_num_add);
mIvReduce = (ImageView) view.findViewById(R.id.iv_num_reduce);
mTvNum = (TextView) view.findViewById(R.id.tv_num);
mIvAdd.setOnClickListener(listener);
mIvReduce.setOnClickListener(listener);
autoChangeWithLongClick(mIvAdd, mIvReduce);
}
private void autoChangeWithLongClick(ImageView... ivs) {
for (ImageView iv : ivs) {
iv.setOnLongClickListener(mLongClickListener);
iv.setOnTouchListener(mTouchListener);
}
}
// 自动变化的 Task;
private Handler mHandler = new Handler();
private static final int DELAY_TIME = 160;
private int mUnit = 1;
private Runnable mTask = new Runnable() {
@Override
public void run() {
setNum(getNum() + mUnit);
mHandler.postDelayed(mTask, DELAY_TIME);
}
};
// 长按开启自动变化;
private boolean mLongClicked;
OnLongClickListener mLongClickListener = new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
mLongClicked = true;
mHandler.postDelayed(mTask, DELAY_TIME);
return mLongClicked;
}
};
// 实现:非长按状态下拖动一定距离开启自动变化;
private float mYLast;
private boolean mChanging;
public boolean dispatchTouchEvent(MotionEvent ev) {
float y = ev.getY();
switch(ev.getAction()){
case MotionEvent.ACTION_DOWN:
mYLast = y;
break;
case MotionEvent.ACTION_UP:
mChanging = false;
break;
case MotionEvent.ACTION_MOVE:
float delta = Math.abs(y - mYLast);
if(delta > 100 && !mChanging && !mLongClicked){
mHandler.postDelayed(mTask, DELAY_TIME);
mChanging = true;
return true;
}
break;
}
return super.dispatchTouchEvent(ev);
};
@SuppressLint("ClickableViewAccessibility")
OnTouchListener mTouchListener = new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
v.setAlpha(0.2f);
v.setBackgroundColor(0x88ffffff);
if (v.getId() == R.id.iv_num_reduce) {
mUnit = -1 * Math.abs(mUnit);
} else if (v.getId() == R.id.iv_num_add) {
mUnit = Math.abs(mUnit);
}
break;
case MotionEvent.ACTION_UP:
// alpha animation
v.setBackgroundResource(0);
v.animate().alpha(1f).setDuration(200).start();
// recover
mLongClicked = false;
mHandler.removeCallbacks(mTask);
break;
}
return false;
}
};
private OnClickListener listener = new OnClickListener() {
@Override
public void onClick(View v) {
int num = getNum();
switch(v.getId()){
case R.id.iv_num_add:
num = num+1;
break;
case R.id.iv_num_reduce:
num = num-1;
break;
}
setNum(num);
}
};
public void setNum(int num){
// default pattern:00
setNum(num, "00");
}
public void setNum(int num, String pattern){
if(num > mMaxNum){
if(mCycleable){
num = mMinNum;
} else {
num = num -1;
}
}
if(num < mMinNum){
if(mCycleable){
num = mMaxNum;
} else {
num = num+1;
}
}
String str = getFormatNumWithPattern(num, pattern);
if(mTvNum != null && str!=null){
mTvNum.setText(str);
}
}
public int getNum(){
return Integer.valueOf(mTvNum.getText().toString());
}
public static String getFormatNumWithPattern(Object object, String pattern){
DecimalFormat df = new DecimalFormat(pattern);
return df.format(object);
}
}
[R.layout.view_num]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="8dp"
android:background="@android:color/holo_red_light"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="@+id/iv_num_add"
android:layout_width="match_parent"
android:layout_height="48dp"
android:contentDescription="@string/app_name"
android:padding="12dp"
android:src="@drawable/num_top" />
<TextView
android:id="@+id/tv_num"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="00"
android:textColor="#000"
android:textSize="24sp"
android:textStyle="bold" />
<ImageView
android:id="@+id/iv_num_reduce"
android:layout_width="match_parent"
android:layout_height="48dp"
android:contentDescription="@string/app_name"
android:padding="12dp"
android:rotation="180"
android:src="@drawable/num_top" />
</LinearLayout>
[num_top.png]
图片--> <--图片
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1 0
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