If the sdk is lower than 5.0, we still have to import the v7 package. I use android studio, so we need to add the following code to the build.gradle to automatically import the support-v7 package. Remember to rebuild the project after configuration.
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.2.1'
compile 'com.android.support:cardview-v7:22.1.0'
}
First look at the layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".CardViewActivity"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:id="@+id/tv_item"
android:layout_width="match_parent"
android:layout_height="250dp"
android:layout_centerInParent="true"
card_view:cardCornerRadius="20dp"
card_view:cardElevation="20dp">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/itachi85"
android:scaleType="centerInside"
/>
<TextView
android:layout_width="150dp"
android:layout_height="50dp"
android:text="android must win"
android:textSize="20sp"
android:layout_gravity="center"
android:textColor="@android:color/white"/>
</android.support.v7.widget.CardView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp">
<SeekBar
android:id="@+id/sb_1"
android:layout_width="200dp"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Control the size of the rounded corners"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp">
<SeekBar
android:id="@+id/sb_2"
android:layout_width="200dp"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Control shadow size"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp">
<SeekBar
android:id="@+id/sb_3"
android:layout_width="200dp"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Control image spacing"/>
</LinearLayout>
</LinearLayout>
There are two important properties of CardView here:
card_view:cardCornerRadius is used to set the radius of the rounded corners.
card_view:cardElevation is used to set the radius of the shadow.
Next, let's take a look at the invocation of the java code:
public class CardViewActivity extends AppCompatActivity {
private CardView mCardView;
private SeekBar sb1;
private SeekBar sb2;
private SeekBar sb3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView(R.layout.activity_card_view);
assignViews();
}
private void assignViews() {
mCardView = (CardView) findViewById(R.id.tv_item);
sb1 = (SeekBar) findViewById(R.id.sb_1);
sb2 = (SeekBar) findViewById(R.id.sb_2);
sb3= (SeekBar) findViewById(R.id.sb_3);
sb1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
mCardView.setRadius(i);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
sb2.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
mCardView.setCardElevation(i);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
sb3.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
mCardView.setContentPadding(i,i,i,i);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
I set three seekBars here to set the CardView respectively:
mCardView.setRadius() sets the radius of the rounded corners
mCardView.setCardElevation() sets the radius of the shadow
mCardView.setContentPadding() sets the distance between the child control and the parent control in the CardView.