圆角背景

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <!-- rectangle表示为矩形 -->

    <!-- 填充的颜色 -->
    <solid android:color="@color/login_input_bg" />

    <!-- 边框的颜色和粗细 -->
    <stroke
        android:width="1dp"
        android:color="@color/login_input_bg"
        />

    <!-- android:radius 圆角的半径 -->
    <corners
        android:radius="15dp"
        />

</shape>

渐变色背景

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <gradient
        android:angle="135"
        android:centerColor="#4169e1"
        android:endColor="#57a6ff"
        android:startColor="#4169e1"
        android:type="linear" />

    <!-- android:radius 圆角的半径 -->
    <corners
        android:radius="25dp"
        />
</shape>

TextView文字渐变色

private void setTextViewStyles(TextView textView) {
        LinearGradient mLinearGradient = new LinearGradient(0, 0, textView.getPaint().getTextSize() * textView.getText().length(), 0,
                Color.parseColor("#57a6ff"), Color.parseColor("#4169e1"), Shader.TileMode.CLAMP);
        textView.getPaint().setShader(mLinearGradient);
        textView.invalidate();
    }

圆形背景

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval"
    android:useLevel="false">
    <!-- 实心 -->
    <solid android:color="@color/white" />
    <stroke
        android:width="1dp"
        android:color="@color/white"/>
    <!-- 圆角 -->
    <corners android:radius="360dp" />
    <!-- 边距 -->
    <padding
        android:bottom="1dp"
        android:left="1dp"
        android:right="1dp"
        android:top="1dp" />
</shape>