我試圖在將它添加到相對佈局後獲取ImageView的位置。在Android中添加布局後獲取元素位置
我通過點擊一個按鈕在相對佈局內隨機添加ImageViews。到目前爲止,這工作非常好。但爲什麼getLeft,getRight,getTop,getBottom返回0?事情是,這些值都可以在下一個按鈕點擊。因此,當ImageView 1的創建過程中所有內容都爲0時,如果再次點擊該按鈕,它就會顯示信息。
所以要清楚:
Buttonclick -1 - >的ImageView-1中加入(輸出0上getLeft,上,右,下)
Buttonclick -2 - >的ImageView -2- (ImageView-1輸出座標,但ImageView-2輸出爲0)
我確定這與ImageView的繪製有關。當我迭代孩子並詢問實際位置時,它肯定沒有準備好在視圖上繪製。
這是到目前爲止我的代碼:
final ConstraintLayout cl = (ConstraintLayout) findViewById(R.id.constraintLayout);
final ScrollView sc=(ScrollView) findViewById(R.id.scrollView);
final Button btnButton = (Button) findViewById(R.id.buttontest);
final LinearLayout ll = (LinearLayout) findViewById(R.id.linearLayout);
final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rLayout);
btnButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ImageView im= new ImageView(UserAreaActivity.this);
im.setImageResource(R.mipmap.ic_launcher);
im.setScaleType(ImageView.ScaleType.FIT_XY);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(150, 150);
Random r = new Random();
Random r2 = new Random();
int x = r.nextInt(rl.getWidth());
int y = r2.nextInt(rl.getHeight());
if(x+(layoutParams.width) >= rl.getWidth()){
x=x-layoutParams.width;
}
if(y+(layoutParams.height) >= rl.getHeight()){
y=y-layoutParams.height;
}
layoutParams.leftMargin=x;
layoutParams.topMargin=y;
im.setLayoutParams(layoutParams);
TextView tv = new TextView(UserAreaActivity.this);
tv.setText("my text");
rl.addView(im);
ll.addView(tv);
System.out.println("ID "+im.getId());
System.out.println("Left "+im.getLeft());
System.out.println("Right "+im.getRight());
System.out.println("Top "+im.getTop());
System.out.println("Bottom "+im.getBottom());
for (int i = 0; i < rl.getChildCount(); i++) {
View subView = rl.getChildAt(i);
if (subView instanceof ImageView) {
ImageView imageView = (ImageView) subView;
System.out.println("ID "+i);
System.out.println("Left "+imageView.getLeft());
System.out.println("Right "+imageView.getRight());
System.out.println("Top "+imageView.getTop());
System.out.println("Bottom "+imageView.getBottom());
}
}
}
});
非常感謝您!這解決了我的問題。順便說一句。我不得不注意我正在處理哪些API,因爲'removeOnGlobalLayoutListener'未包含在API Lvl 15中 – Sully