Android中自定義ViewGroup使每行元件數量不確定，並拿到選中資料
阿新 • • 發佈：2019-01-01
1先看效果圖
2專案目錄
3在定義控制元件FlowTagGroup
package android.zhh.com.myviewgroup;
/**
* Created by sky on 2017/3/10.
*/
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
/**
* 流佈局
*/
public class FlowTagGroup extends ViewGroup {
public FlowTagGroup(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public FlowTagGroup(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FlowTagGroup(Context context) {
this(context, null);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
// wrap_content
int width = 0;
int height = 0;
// 記錄每一行的寬度與高度
int lineWidth = 0;
int lineHeight = 0;
// 得到內部元素的個數
int cCount = getChildCount();
for (int i = 0; i < cCount; 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佔據的寬度
int childWidth = child.getMeasuredWidth() + lp.leftMargin
+ lp.rightMargin;
// 子View佔據的高度
int childHeight = child.getMeasuredHeight() + lp.topMargin
+ lp.bottomMargin;
// 換行
if (lineWidth + childWidth > sizeWidth - getPaddingLeft()
- getPaddingRight()) {
// 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
// 未換行
{
// 疊加行寬
lineWidth += childWidth;
// 得到當前行最大的高度
lineHeight = Math.max(lineHeight, childHeight);
}
// 最後一個控制元件
if (i == cCount - 1) {
width = Math.max(lineWidth, width);
height += lineHeight;
}
}
Log.e("TAG", "sizeWidth = " + sizeWidth);
Log.e("TAG", "sizeHeight = " + sizeHeight);
setMeasuredDimension(
//
modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width
+ getPaddingLeft() + getPaddingRight(),
modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height
+ getPaddingTop() + getPaddingBottom()//
);
}
/**
* 儲存所有的View
*/
private List<List<View>> mAllViews = new ArrayList<List<View>>();
/**
* 每一行的高度
*/
private List<Integer> mLineHeight = new ArrayList<Integer>();
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mAllViews.clear();
mLineHeight.clear();
// 當前ViewGroup的寬度
int width = getWidth();
int lineWidth = 0;
int lineHeight = 0;
List<View> lineViews = new ArrayList<View>();
int cCount = getChildCount();
for (int i = 0; i < cCount; 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
- getPaddingLeft() - getPaddingRight()) {
// 記錄LineHeight
mLineHeight.add(lineHeight);
// 記錄當前行的Views
mAllViews.add(lineViews);
// 重置我們的行寬和行高
lineWidth = 0;
lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
// 重置我們的View集合
lineViews = new ArrayList<View>();
}
lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
+ lp.bottomMargin);
lineViews.add(child);
}// for end
// 處理最後一行
mLineHeight.add(lineHeight);
mAllViews.add(lineViews);
// 設定子View的位置
int left = getPaddingLeft();
int top = getPaddingTop();
// 行數
int lineNum = mAllViews.size();
for (int i = 0; i < lineNum; i++) {
// 當前行的所有的View
lineViews = mAllViews.get(i);
lineHeight = mLineHeight.get(i);
for (int j = 0; j < lineViews.size(); j++) {
View child = lineViews.get(j);
// 判斷child的狀態
if (child.getVisibility() == View.GONE) {
continue;
}
MarginLayoutParams lp = (MarginLayoutParams) child
.getLayoutParams();
int lc = left + lp.leftMargin;
int tc = top + lp.topMargin;
int rc = lc + child.getMeasuredWidth();
int bc = tc + child.getMeasuredHeight();
// 為子View進行佈局
child.layout(lc, tc, rc, bc);
left += child.getMeasuredWidth() + lp.leftMargin
+ lp.rightMargin;
}
left = getPaddingLeft();
top += lineHeight;
}
}
/**
* 與當前ViewGroup對應的LayoutParams
*/
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
}
}
4activity_main.xml檔案中引用自定義控制元件
<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"
tools:context=".MainActivity"
android:orientation="vertical"
>
<!-- 流佈局中的屬性-->
<android.zhh.com.myviewgroup.FlowTagGroup
android:id="@+id/ftgAttribute"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="50dp"
>
</android.zhh.com.myviewgroup.FlowTagGroup>
</LinearLayout>
5MainActivity中使用
package android.zhh.com.myviewgroup;
import android.app.Activity;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
public class MainActivity extends Activity {
// 流佈局
private FlowTagGroup ftgAttribute;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView(){
ftgAttribute = (FlowTagGroup)findViewById(R.id.ftgAttribute);
String mNames[] = {
"回覆快塊塊快塊塊","專業專業專業專業專業",
"熱情周到",
"及時解決","不專業",
"態度差",
"回覆",
"態度好"
};
ViewGroup.MarginLayoutParams lp = new ViewGroup.MarginLayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lp.leftMargin = 10;
lp.rightMargin = 10;
lp.topMargin = 10;
lp.bottomMargin = 10;
for(int i = 0; i < mNames.length; i ++) {
MyTextView myTextView= new MyTextView(this);
myTextView.setText(mNames[i]);
myTextView.setTextColor(Color.parseColor("#666666"));
myTextView.setBackgroundResource(R.drawable.bg_comment_attribute_off);
ftgAttribute.addView(myTextView, lp);
// 點選事件和拿到資料
myTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 選中狀態isSelected=true
if(((MyTextView)v).isSelected){
Log.e("111","選中狀態");
((MyTextView) v).setTextColor(Color.parseColor("#ffffff"));
((MyTextView)v).setBackgroundResource(R.drawable.bg_comment_attribute_on);
((MyTextView)v).isSelected=false;
}
// 不選中狀態
else{
Log.e("111", "未選中狀態");
((MyTextView) v).setTextColor(Color.parseColor("#666666"));
((MyTextView)v).setBackgroundResource(R.drawable.bg_comment_attribute_off);
((MyTextView)v).isSelected=true;
}
// 列印選中的資料
for(int i=0;i<ftgAttribute.getChildCount();i++){
if(((MyTextView)ftgAttribute.getChildAt(i)).isSelected){
}else{
// 選中狀態把isSelected都設定成了false
Log.d("123"," select text :"+ ((MyTextView)ftgAttribute.getChildAt(i)).getText());
}
}
}
});
}
}
}
6MyTextView檔案（自定義TextView）
package android.zhh.com.myviewgroup;
import android.content.Context;
import android.widget.TextView;
/**
* Created by sky on 2017/3/10.
*/
public class MyTextView extends TextView {
// 預設不選中
public boolean isSelected=true;
public MyTextView(Context context) {
super(context);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<!-- 頂部帶圓角 白色背景 灰色邊框 無下邊框 長方體 -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<solid android:color="#4395FF" />
<corners android:topLeftRadius="20dp" android:topRightRadius="20dp"
android:bottomRightRadius="20dp" android:bottomLeftRadius="20dp" />
<stroke android:width="0dp" android:color="#ffa8abad" />
<padding
android:left="15dp"
android:right="15dp"
android:top="5dp"
android:bottom="5dp"
/>
</shape>
</item>
</layer-list>
<?xml version="1.0" encoding="UTF-8"?>
<!-- 頂部帶圓角 白色背景 灰色邊框 無下邊框 長方體 -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<solid android:color="#ffffff" />
<corners android:topLeftRadius="20dp" android:topRightRadius="20dp"
android:bottomRightRadius="20dp" android:bottomLeftRadius="20dp" />
<stroke android:width="1dp" android:color="#E1E1E1" />
<padding
android:left="15dp"
android:right="15dp"
android:top="5dp"
android:bottom="5dp"
/>
</shape>
</item>
</layer-list>原始碼下載：