我有一个具有以下属性的按钮:
circle_normal.xml(在res / drawable中)
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:padding="10dp"
android:shape="oval" >
<solid android:color="#FF6347" />
<size
android:height="325dp"
android:width="325dp" />
</shape>
circle.xml(在res / drawable中)
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/circle_pressed" android:state_pressed="true"/>
<item android:drawable="@drawable/circle_normal"></item>
</selector>
activity_main.xml(在res / layout中)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/layout_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".Main" >
<Button
android:id="@+id/button_study"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="@drawable/circle"
android:gravity="center" />
</RelativeLayout>
Main.java(在src中)
buttonStudy = (Button) findViewById(R.id.button_study);
最终产品是我得到一个圆形的按钮。但是,由于不同Android设备上的屏幕尺寸不同,这一个圆圈尺寸不足。我看了几个与此类似的问题,但他们的解决方案对我没什么帮助。如何在Java代码中动态更改其大小?
答案 0 :(得分:4)
试试这种方式
final Button buttonStudy = (Button) findViewById(R.id.button_study);
buttonStudy.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ViewGroup.LayoutParams params = buttonStudy.getLayoutParams();
params.width = 100;//change the width size
params.height= 100;//change the hight size
buttonStudy.setLayoutParams(params);
}
});
cheerz
答案 1 :(得分:2)
btn = (Button) findViewByID(R.id.button_study);
btn.getLayoutParams().height = x;
btn.getLayoutParams().width = x;
btn.setLayoutParams(btn.getLayoutParams);
使用此代码,您可以设置按钮的高度和宽度。此外,这将避免父视图解析冲突。
此外,您可以获得屏幕大小,然后相应地设置按钮大小: -
对于API&lt; 13
Display display = getWindowManager().getDefaultDisplay();
int screenWidth = display.getWidth();
int screenHeight = display.getHeight(); //not required, just to inform
int x = (int) screenWidth/10; //replace 10 by scaling factor
btn = (Button) findViewByID(R.id.button_study);
btn.getLayoutParams().height = x;
btn.getLayoutParams().width = x;
btn.setLayoutParams(btn.getLayoutParams);
对于API&gt; = 13
Point size = new Point();
display.getSize(size);
int screenWidth = size.x;
int screenHeight = size.y; //not required, just for info
int x = (int) screenWidth/10; //replace 10 by scaling factor
btn = (Button) findViewByID(R.id.button_study);
btn.getLayoutParams().height = x;
btn.getLayoutParams().width = x;
btn.setLayoutParams(btn.getLayoutParams);
要在运行时检查API级别,请使用
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
//<code> if API>=13 (HONEYCOMB_MR2 is API 13)
}
else {
//<code> if API<13
}
希望它有所帮助。 快乐编程:)