动态/以编程方式设置具有可绘制背景的按钮的大小

Question

I have a button that has the following properties:

circle_normal.xml (in res/drawable)

<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 (in res/drawable)

<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 (in res/layout)

<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 (in src)

buttonStudy = (Button) findViewById(R.id.button_study);

The final product is that I get a button that is in the shape of a circle. However, due to the difference screen sizes on different Android devices, this one circle size is insufficient. I've looked at a few other questions similar to this but their solutions didn't help me very much. How do I change its size dynamically in the Java code?

Answer 1

try this way

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

Answer 2

btn = (Button) findViewByID(R.id.button_study);

btn.getLayoutParams().height = x;
btn.getLayoutParams().width = x;

btn.setLayoutParams(btn.getLayoutParams);

Using this code, you can set the height and width of the button. Also, this would avoid the parent view parsing conflict.

Also, you can get the size of screen and then set size of button accordingly:-

For API<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);

For API>=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);

to check for API level at runtime, use

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {

         //<code> if API>=13 (HONEYCOMB_MR2 is API 13)
}

else {

         //<code> if API<13
}

Hope it helps. Happy Programming :)