Android自定义组件之自动换行View
做Android这么长时间,对自定义组件这块知识了解的很少。之前公司项目里有个模块需求是自动换行,今天重新写个组件实现这个效果。
效果图如下:
组件是继承的ViewGroup,在用的时候调用addView方法把TextView加进去,然后该组件会把textview放到合适的位置。
WordWrapView.java
public class WordWrapView extends ViewGroup { private static final int PADDING_HOR = 10;//水平方向padding private static final int PADDING_VERTICAL = 5;//垂直方向padding private static final int SIDE_MARGIN = 10;//左右间距 private static final int TEXT_MARGIN = 10; /** * @param context */ public WordWrapView(Context context) { super(context); } /** * @param context * @param attrs * @param defStyle */ public WordWrapView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } /** * @param context * @param attrs */ public WordWrapView(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { int childCount = getChildCount(); int autualWidth = r - l; int x = SIDE_MARGIN;// 横坐标开始 int y = 0;//纵坐标开始 int rows = 1; for(int i=0;i<childCount;i++){ View view = getChildAt(i); view.setBackgroundColor(Color.GREEN); int width = view.getMeasuredWidth(); int height = view.getMeasuredHeight(); x += width+TEXT_MARGIN; if(x>autualWidth){ x = width+SIDE_MARGIN; rows++; } y = rows*(height+TEXT_MARGIN); if(i==0){ view.layout(x-width-TEXT_MARGIN, y-height, x-TEXT_MARGIN, y); }else{ view.layout(x-width, y-height, x, y); } } }; @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int x = 0;//横坐标 int y = 0;//纵坐标 int rows = 1;//总行数 int specWidth = MeasureSpec.getSize(widthMeasureSpec); int actualWidth = specWidth - SIDE_MARGIN * 2;//实际宽度 int childCount = getChildCount(); for(int index = 0;index<childCount;index++){ View child = getChildAt(index); child.setPadding(PADDING_HOR, PADDING_VERTICAL, PADDING_HOR, PADDING_VERTICAL); child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED); int width = child.getMeasuredWidth(); int height = child.getMeasuredHeight(); x += width+TEXT_MARGIN; if(x>actualWidth){//换行 x = width; rows++; } y = rows*(height+TEXT_MARGIN); } setMeasuredDimension(actualWidth, y); } }
MainActivity.java
public class MainActivity extends Activity { private WordWrapView wordWrapView; private String[] strs = new String[] { "哲学系", "新疆维吾尔族自治区", "新闻学", "心理学", "犯罪心理学", "明明白白", "西方文学史", "计算机", "掌声", "心太软", "生命", "程序开发" }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); wordWrapView = (WordWrapView) this.findViewById(R.id.view_wordwrap); for (int i = 0; i < 12; i++) { TextView textview = new TextView(this); textview.setText(strs[i]); wordWrapView.addView(textview); } } }
activity_main.xml
<RelativeLayout 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" > <com.winhoo.viewtest.widget.WordWrapView android:id="@+id/view_wordwrap" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" /> </RelativeLayout>
欢迎批评指正!谢谢。
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