Java 以编程方式滚动 ScrollView 以专注于按钮或视图 - Android
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Programmatically scroll a ScrollView to focus on a Button or a view - Android
提问by Matt
I have an Activity that has a ScrollViewof 125 buttons. The 125 buttons are Levels in my game that slowly get unlocked (think of Candy Crush Saga). Right now if the user is on the level, let's say, 88 of 125 then the user has to manually scroll all the way down to button 88.
我有一个有ScrollView125 个按钮的活动。125 个按钮是我游戏中慢慢解锁的关卡（想想 Candy Crush Saga）。现在，如果用户在级别上，比如说，125 个中的 88 个，那么用户必须手动一直向下滚动到按钮 88。
My question is, how would I make it so that when the Activity loads, it automatically scrolls down and centers the ScrollView on a certain button?
我的问题是，我将如何使它在 Activity 加载时自动向下滚动并将 ScrollView 居中放置在某个按钮上？
Below is my code of how the buttons are created and populated programmatically.
下面是我如何以编程方式创建和填充按钮的代码。
ScrollView scrollView;
@Override
public void onCreate(Bundle savedInstanceState) {
LinearLayout lay = (LinearLayout)findViewById(R.id.linearlayout);
for(int i = 0; i < 125; i++) {
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 0);
params.weight = 1;
params.gravity = Gravity.CENTER;
if(i == 0) {
TextView textview = new TextView(this);
textview.setLayoutParams(params);
textview.setTextSize(15);
textview.setText(c.getResources().getString(R.string.l1to5));
TextView textview2 = new TextView(this);
textview2.setLayoutParams(params);
textview.setTextSize(15);
textview2.setText(c.getResources().getString(R.string.goal100));
TextView textview3 = new TextView(this);
textview3.setLayoutParams(params);
textview.setTextSize(15);
textview3.setText(c.getResources().getString(R.string.catRandom));
if((getResources().getConfiguration().screenLayout &
Configuration.SCREENLAYOUT_SIZE_MASK) ==
Configuration.SCREENLAYOUT_SIZE_LARGE) {
textview.setTextSize(22);
textview2.setTextSize(22);
textview3.setTextSize(22);
} else if((getResources().getConfiguration().screenLayout &
Configuration.SCREENLAYOUT_SIZE_MASK) ==
Configuration.SCREENLAYOUT_SIZE_XLARGE) {
textview.setTextSize(22);
textview2.setTextSize(22);
textview3.setTextSize(22);
}
lay.addView(textview);
lay.addView(textview2);
lay.addView(textview3);
View ruler = new View(this);
ruler.setBackgroundColor(0xFFC2BEBF);
lay.addView(ruler, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 2));
}
if(i == 5) {
// ....
}
Button button = new Button(this);
int _id = getResources().getIdentifier("b" + (i + 1), "id", this.getPackageName());
button.setTag(_id);
button.setLayoutParams(params);
if((getResources().getConfiguration().screenLayout &
Configuration.SCREENLAYOUT_SIZE_MASK) ==
Configuration.SCREENLAYOUT_SIZE_LARGE) {
button.setTextSize(22);
} else if((getResources().getConfiguration().screenLayout &
Configuration.SCREENLAYOUT_SIZE_MASK) ==
Configuration.SCREENLAYOUT_SIZE_XLARGE) {
button.setTextSize(22);
}
button.setText("Level " + (i + 1));
final int x = i + 1;
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
singleton.setLevelJustPlayed(x);
// ...
} else {
// ...
Intent intent = new Intent(Levels.this, Categories.class);
startActivity(intent);
}
}
});
lay.addView(button);
if(singleton.getLevel() >= (i + 1)) {
button.setEnabled(true);
} else {
button.setEnabled(false);
}
}
// end the onCreate() method
采纳答案by trippedout
try
尝试
yourScrollView.scrollTo(0, (int) button.getY());
回答by P. Mohanta
For Kotlin user
对于 Kotlin 用户
your_scrollview.post( { your_scrollview.scrollTo(0, your_view_inside_SV.getY().toInt()) })
