該demo使用了自定義的流式布局+AutoCompleteTextView+SharedPreferences實作了各大APP常用到的搜尋曆史記錄的功能，代碼簡單實用。
廢話不多說，上效果圖為證：
上代碼：第一步：自定義流式布局ZFlowLayout（讓标簽自動換行）
package cn.cnpp.searchhistory;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
/*****************************
* @Copyright(c) 2014-2018
* @Author：dengyalan
* @Date：2018/1/16
* @Description：自定義搜尋标簽布局
* @Version:v1.0.0
*****************************/
public class ZFlowLayout extends ViewGroup {
/**
* 存儲所有子View
*/
private List<List<View>> mAllChildViews = new ArrayList<>();
/**
* 每一行的高度
*/
private List<Integer> mLineHeight = new ArrayList<>();
public ZFlowLayout(Context context) {
this(context, null);
}
public ZFlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ZFlowLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//父控件傳進來的寬度和高度以及對應的測量模式
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
//如果目前ViewGroup的寬高為wrap_content的情況
//自己測量的寬度
int width = 0;
//自己測量的高度
int height = 0;
//記錄每一行的寬度和高度
int lineWidth = 0;
int lineHeight = 0;
//擷取子view的個數
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
//測量子View的寬和高
measureChild(child, widthMeasureSpec, heightMeasureSpec);
//得到LayoutParams
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
//子View占據的寬度
int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
//子View占據的高度
int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
//換行時候
if (lineWidth + childWidth > sizeWidth) {
//對比得到最大的寬度
width = Math.max(width, lineWidth);
//重置lineWidth
lineWidth = childWidth;
//記錄行高
height += lineHeight;
lineHeight = childHeight;
} else {//不換行情況
//疊加行寬
lineWidth += childWidth;
//得到最大行高
lineHeight = Math.max(lineHeight, childHeight);
}
//處理最後一個子View的情況
if (i == childCount - 1) {
width = Math.max(width, lineWidth);
height += lineHeight;
}
}
//wrap_content
setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width,
modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mAllChildViews.clear();
mLineHeight.clear();
//擷取目前ViewGroup的寬度
int width = getWidth();
int lineWidth = 0;
int lineHeight = 0;
//記錄目前行的view
List<View> lineViews = new ArrayList<View>();
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
//如果需要換行
if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width) {
//記錄LineHeight
mLineHeight.add(lineHeight);
//記錄目前行的Views
mAllChildViews.add(lineViews);
//重置行的寬高
lineWidth = 0;
lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
//重置view的集合
lineViews = new ArrayList();
}
lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin);
lineViews.add(child);
}
//處理最後一行
mLineHeight.add(lineHeight);
mAllChildViews.add(lineViews);
//設定子View的位置
int left = 0;
int top = 0;
//擷取行數
int lineCount = mAllChildViews.size();
for (int i = 0; i < lineCount; i++) {
//目前行的views和高度
lineViews = mAllChildViews.get(i);
lineHeight = mLineHeight.get(i);
for (int j = 0; j < lineViews.size(); j++) {
View child = lineViews.get(j);
//判斷是否顯示
if (child.getVisibility() == View.GONE) {
continue;
}
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
int cLeft = left + lp.leftMargin;
int cTop = top + lp.topMargin;
int cRight = cLeft + child.getMeasuredWidth();
int cBottom = cTop + child.getMeasuredHeight();
//進行子View進行布局
child.layout(cLeft, cTop, cRight, cBottom);
left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
}
left = 0;
top += lineHeight;
}
}
/**
* 與目前ViewGroup對應的LayoutParams
*/
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
}
}
第二步：建立一個SharePreference工具類，用來儲存、讀取、清除曆史搜尋記錄，這裡貼上這三個方法的代碼
/**
* 儲存搜尋記錄
*
* @param keyword
*/
public void save(String keyword) {
// 擷取搜尋框資訊
SharedPreferences mysp = mContext.getSharedPreferences("search_history", 0);
String old_text = mysp.getString("history", "");
// 利用StringBuilder.append新增内容，逗号便于讀取内容時用逗号拆分開
StringBuilder builder = new StringBuilder(old_text);
builder.append(keyword + ",");
// 判斷搜尋内容是否已經存在于曆史檔案，已存在則不重複添加
if (!old_text.contains(keyword + ",")) {
SharedPreferences.Editor myeditor = mysp.edit();
myeditor.putString("history", builder.toString());
myeditor.commit();
}
}
public String[] getHistoryList() {
// 擷取搜尋記錄檔案内容
SharedPreferences sp = mContext.getSharedPreferences("search_history", 0);
String history = sp.getString("history", "");
// 用逗号分割内容傳回數組
String[] history_arr = history.split(",");
// 保留前50條資料
if (history_arr.length > 50) {
String[] newArrays = new String[50];
System.arraycopy(history_arr, 0, newArrays, 0, 50);
}
return history_arr;
}
/**
* 清除搜尋記錄
*/
public void cleanHistory() {
SharedPreferences sp = mContext.getSharedPreferences("search_history", 0);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
editor.commit();
} 最後呢，就到了關鍵的一步啦，在Activity裡進行讀寫初始化操作啦。
package cn.cnpp.searchhistory;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.TextView;
import android.widget.Toast;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
/**
* @author dengyalan
*/
public class MainActivity extends AppCompatActivity {
@BindView(R.id.auto_search)
AutoCompleteTextView autoSearch;
@BindView(R.id.keyword_fl)
ZFlowLayout keywordFl;
@BindView(R.id.history_fl)
ZFlowLayout historyFl;
public static String[] searchWord = {"淨水器", "手機", "電動車", "洗衣機", "沙發", "冰箱", "瓷磚", "空調", "床墊", "衛浴", "熱水器", "床", "家具", "手表", "電視", "內建竈", "領帶", "保溫杯", "童裝", "自行車", "空氣淨化器", "地闆", "矽藻泥", "油煙機", "智能家居"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
initView();
}
private void initView() {
initKeyword(searchWord);
initHistory();
String[] data = SPUtils.getInstance(this).getHistoryList();
ArrayAdapter<String> autoCompleteAdapter = new ArrayAdapter<String>(this,
R.layout.view_mw_textview, data);
autoSearch.setAdapter(autoCompleteAdapter);
autoSearch.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
if (charSequence.length() > 0) {
}
}
@Override
public void afterTextChanged(Editable editable) {
}
});
}
private void initHistory() {
final String[] data = SPUtils.getInstance(this).getHistoryList();
ViewGroup.MarginLayoutParams layoutParams = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(10, 10, 10, 10);
historyFl.removeAllViews();
for (int i = 0; i < data.length; i++) {
if (isNullorEmpty(data[i])) {
return;
}
final int j = i;
//添加分類塊
View paramItemView = getLayoutInflater().inflate(R.layout.adapter_search_keyword, null);
TextView keyWordTv = paramItemView.findViewById(R.id.tv_content);
keyWordTv.setText(data[j]);
keyWordTv.setBackgroundResource(R.drawable.whitebg_strokegrey_radius3);
historyFl.addView(paramItemView, layoutParams);
keyWordTv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
autoSearch.setText(data[j]);
}
});
}
}
private void initKeyword(final String[] keyword) {
ViewGroup.MarginLayoutParams layoutParams = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(10, 10, 10, 10);
keywordFl.removeAllViews();
for (int i = 0; i < keyword.length; i++) {
final int j = i;
//添加分類塊
View paramItemView = getLayoutInflater().inflate(R.layout.adapter_search_keyword, null);
TextView keyWordTv = paramItemView.findViewById(R.id.tv_content);
keyWordTv.setText(keyword[j]);
keyWordTv.setBackgroundResource(R.drawable.whitebg_strokegrey_radius3);
keywordFl.addView(paramItemView, layoutParams);
keyWordTv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
autoSearch.setText(keyword[j]);
}
});
}
}
@OnClick({R.id.iv_back, R.id.clear_iv, R.id.tv_search})
public void onClick(View view) {
switch (view.getId()) {
case R.id.iv_back:
finish();
break;
case R.id.tv_search:
String searchKey = autoSearch.getText().toString();
if (!isNullorEmpty(searchKey)) {
Intent intent = new Intent(MainActivity.this, SearchResultActivity.class);
intent.putExtra("key", searchKey);
startActivityForResult(intent, 0);
String keyWord = autoSearch.getText().toString();
if (!isNullorEmpty(keyWord)) {
SPUtils.getInstance(MainActivity.this).save(autoSearch.getText().toString());
}
} else {
showToastShort(this, "搜尋内容為空！");
}
break;
case R.id.clear_iv:
SPUtils.getInstance(MainActivity.this).cleanHistory();
showToastShort(this, "已清除曆史記錄！");
initHistory();
break;
default:
break;
}
}
private boolean isNullorEmpty(String str) {
return str == null || "".equals(str);
}
private void showToastShort(Context context, String data) {
Toast toast = Toast.makeText(context, data, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
initHistory();
}
}
}
} 差點忘記還有布局檔案：
<?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:background="@color/white"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="45dp"
android:background="@color/colorPrimary"
android:gravity="center"
android:orientation="horizontal">
<ImageView
android:id="@+id/iv_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginRight="3dp"
android:padding="10dp"
android:src="@mipmap/back" />
<AutoCompleteTextView
android:id="@+id/auto_search"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/whitebg_radius3"
android:completionThreshold="1"
android:drawableLeft="@mipmap/search_icon"
android:drawablePadding="5dp"
android:hint="請輸入您要搜尋的内容"
android:padding="8dp"
android:singleLine="true"
android:textSize="12sp" />
<TextView
android:id="@+id/tv_search"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:paddingLeft="10dp"
android:paddingRight="15dp"
android:text="搜尋"
android:textColor="@color/white"
android:textSize="13dp" />
</LinearLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:scrollbars="none">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:drawableLeft="@mipmap/fire_grey"
android:drawablePadding="3dp"
android:text="熱門搜尋"
android:textColor="@color/grey_4d4d4d"
android:textSize="13sp" />
<View style="@style/VerticalLineStyle" />
<cn.cnpp.searchhistory.ZFlowLayout
android:id="@+id/keyword_fl"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:drawableLeft="@mipmap/history_grey"
android:drawablePadding="3dp"
android:text="搜尋記錄"
android:textColor="@color/grey_4d4d4d"
android:textSize="13sp" />
<ImageView
android:id="@+id/clear_iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:padding="10dp"
android:src="@mipmap/delete_grey" />
</RelativeLayout>
<cn.cnpp.searchhistory.ZFlowLayout
android:id="@+id/history_fl"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</LinearLayout> 主要的代碼就在這裡了，如果想看完整的代碼就點選下方的連結去下載下傳demo吧。
https://download.csdn.net/download/u012360948/10393547