自定义view之流式布局

来源：互联网发布：清晰度测量算法编辑：程序博客网时间：2024/05/01 05:57

mainactivity代码

  *********注意 *****************

 ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT

    这一行也许会报红，但还可以正常运行

public class MainActivity extends AppCompatActivity {    private Liushi mFlowLayout;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mFlowLayout = (Liushi) findViewById(R.id.liu);        initChildViews();    }    private String mNames[] = {            "welcome","android","TextView",            "apple","jamy","kobe bryant",            "jordan","layout","viewgroup",            "margin","padding","text",            "name","type","search","logcat",            "shanshan","woaini1314","tiangchangdijiu"            ,"玫瑰花","珊珊","ssddssdsdsdsdsdsdsadsadsadsdsad",            "ssddssdsdsdsdsdsdsadsadsadsdsad"    };    private void initChildViews() {        // TODO Auto-generated method stub        ViewGroup.MarginLayoutParams lp = new ViewGroup.MarginLayoutParams(                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);        lp.leftMargin = 20;        lp.rightMargin = 20;        lp.topMargin = 10;        lp.bottomMargin = 10;        for(int i = 0; i < mNames.length; i ++){            TextView view = new TextView(this);            view.setText(mNames[i]);            view.setTextColor(Color.WHITE);            view.setBackgroundDrawable(getResources().getDrawable(R.drawable.textview_bg));            mFlowLayout.addView(view,lp);        }    }}

绘画 Liushi 继承view

public class Liushi extends ViewGroup {    //存储所有子View    private List<List<View>> mAllChildViews = new ArrayList<>();    //每一行的高度    private List<Integer> mLineHeight = new ArrayList<>();    public Liushi(Context context) {        super(context);    }    public Liushi(Context context, AttributeSet attrs) {        super(context, attrs);    }    public Liushi(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        //父控件传进来的宽度和高度以及对应的测量模式        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);        int modeWidth = MeasureSpec.getMode(widthMeasureSpec);        int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);        //如果当前ViewGroup的宽高为wrap_content的情况        int width = 0;//自己测量的 宽度        int height = 0;//自己测量的高度        //记录每一行的宽度和高度        int lineWidth = 0;        int lineHeight = 0;        //获取子view的个数        int childCount = getChildCount();        for(int i = 0;i < childCount; i ++){            View child = getChildAt(i);            //测量子View的宽和高            measureChild(child, widthMeasureSpec, heightMeasureSpec);            //得到LayoutParams            MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams();            //子View占据的宽度            int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;            //子View占据的高度            int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;            //换行时候            if(lineWidth + childWidth > sizeWidth){                //对比得到最大的宽度                width = Math.max(width, lineWidth);                //重置lineWidth                lineWidth = childWidth;                //记录行高                height += lineHeight;                lineHeight = childHeight;            }else{//不换行情况                //叠加行宽                lineWidth += childWidth;                //得到最大行高                lineHeight = Math.max(lineHeight, childHeight);            }            //处理最后一个子View的情况            if(i == childCount -1){                width = Math.max(width, lineWidth);                height += lineHeight;            }        }        //wrap_content        setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width,                modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height);        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    @Override    protected void onLayout(boolean b, int l, int i1, int i2, int i3) {        mAllChildViews.clear();        mLineHeight.clear();        //获取当前ViewGroup的宽度        int width = getWidth();        int lineWidth = 0;        int lineHeight = 0;        //记录当前行的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();            //如果需要换行            if(childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width){                //记录LineHeight                mLineHeight.add(lineHeight);                //记录当前行的Views                mAllChildViews.add(lineViews);                //重置行的宽高                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);        }        //处理最后一行        mLineHeight.add(lineHeight);        mAllChildViews.add(lineViews);        //设置子View的位置        int left = 0;        int top = 0;        //获取行数        int lineCount = mAllChildViews.size();        for(int i = 0; i < lineCount; i ++){            //当前行的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);                //判断是否显示                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();                //进行子View进行布局                child.layout(cLeft, cTop, cRight, cBottom);                left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;            }            left = 0;            top += lineHeight;        }    }    /**     159.     * 与当前ViewGroup对应的LayoutParams     160.     */    @Override    public LayoutParams generateLayoutParams(AttributeSet attrs) {        // TODO Auto-generated method stub        return new MarginLayoutParams(getContext(), attrs);    }}

drawable文件下创建 textview_bg.xml 代码如下：

<shape xmlns:android="http://schemas.android.com/apk/res/android">    <solid android:color="#666666" />       <corners android:radius="10dp" />       <padding          android:left="5dp"         android:right="5dp"          android:top="5dp"          android:bottom="5dp"       /></shape>

layout布局

<RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" tools:context="com.bwie.liushibujiu.MainActivity">    <com.bwie.liushibujiu.view.Liushi        android:id="@+id/liu"        android:layout_width="match_parent"        android:layout_height="match_parent"></com.bwie.liushibujiu.view.Liushi></RelativeLayout>

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