我有一个小应用程序,它使用自定义的LinearLayout,称为LinearlayoutOutlined.我想在其中绘制不同大小和彩色的盒子.它还有两个指示时间间隔的文本标签.在进行一些用户操作后,必须重新绘制布局.因此我按原样刷新布局
slotPanel.setDayBoundariesInMinutes( db, dw );
TimeSlot[] tSlots = nextDaysSlots.getGaps( dayOfWeek );
slotPanel.setItems( tSlots );
slotPanel.invalidate();
其中slotpanel是LinearLayoutOutlined实例.
我检测到onDraw方法被不断调用.在特定的循环次数之后,它不会停止调用.
这是整个LinearLayoutOutlined类：
包com.widgets;
public class LinearLayoutOutlined extends LinearLayout {
private int workingTimeBeginsInMinutes;
private int workingTimeFinishesInMinutes;
private TimeSlot[] items;
private Rect outline;
private Paint strokePaint = new Paint();
SimpleDateFormat formatter;
public LinearLayoutOutlined( Context context ) {
super( context );
setWillNotDraw( false );
}
public LinearLayoutOutlined( Context context, AttributeSet attrs ) {
super( context, attrs );
setWillNotDraw( false );
}
public void setWorkingTimeBeginsInMinutes( int m ) {
this.workingTimeBeginsInMinutes = m;
}
public void setWorkingTimeFinishesInMinutes( int m ) {
this.workingTimeFinishesInMinutes = m;
}
public void setDayWidthInMinutes( int dayWidthInMinutes ) {
this.workingTimeFinishesInMinutes = this.workingTimeBeginsInMinutes + dayWidthInMinutes;
}
public void setDayBoundariesInMinutes( int daybeginInMinutes, int dayWidthInMinutes ) {
setWorkingTimeBeginsInMinutes( daybeginInMinutes );
setDayWidthInMinutes( dayWidthInMinutes );
}
private int getWorkingTimeBeginsInMinutes() {
return workingTimeBeginsInMinutes;
}
public int getWorkingTimeFinishesInMinutes() {
return workingTimeFinishesInMinutes;
}
public void setItems( TimeSlot[] items ) {
this.items = items;
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw( Canvas canvas ) {
if( items == null ) return;
// time labels
TextView tvFrom = ( TextView )findViewById( R.id.lblStartingTime ), tvTo = ( TextView )findViewById( R.id.lblFinishingTime );
formatter = new SimpleDateFormat( "HH:mm", Locale.getDefault() );
tvFrom.setText( formatter.format( new Date( getWorkingTimeBeginsInMinutes() * 60000L ) ) );
tvTo.setText( formatter.format( new Date( getWorkingTimeFinishesInMinutes() * 60000L ) ) );
strokePaint.setStyle( Paint.Style.STROKE );
strokePaint.setStrokeWidth( 1 );
strokePaint.setStyle( Style.FILL );
outline = canvas.getClipBounds();
Convert.setDayBoundaries( getWorkingTimeBeginsInMinutes(), getWorkingTimeFinishesInMinutes(), outline );
for( TimeSlot slotItem: items ) {
RectTouchable rect = Convert.ToRect( slotItem );
if( slotItem.isFree() )
strokePaint.setARGB( 255, 0, 255, 0 );
else
strokePaint.setARGB( 255, 255, 0, 0 );
canvas.drawRect( rect.getRect(), strokePaint );
}
}
}
请给我一些想法,我该怎么办？
Thanx提前
我不明白为什么我不能在自己的问题上添加评论？！？
@Romain Guy：
谢谢！好的,我明白了.但我必须将setText()与drawin框一起使用.文本标签被覆盖,它们是最顶层的.我该怎么办？
解决方法:
每次在TextView上调用setText()时,UI工具包都需要重新布局并重新绘制UI.因为每次调用onDraw()时都会这样做,所以你基本上创建了一个无限的绘图循环.
你的draw方法中还有其他问题：你不应该每次都做一个findViewById(),你不应该每次都创建一个新的SimpleDateFormat,你不应该每次都创建新的Date对象,等等.
标签：android,android-linearlayout
来源： https://codeday.me/bug/20190725/1535630.html