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如何給文字新增陰影效果

package com.loaderman.customviewdemo;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity  {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super
.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView tv = (TextView)findViewById(R.id.tv); tv.setShadowLayer(2,5,5, Color.RED); } }
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_gravity="center" android:gravity="center" android:background="@android:color/white" > <TextView android:id="@+id/tv" android:layout_width
="match_parent" android:text="動態程式碼陰影效果" android:layout_gravity="center" android:gravity="center" android:textSize="18sp" android:layout_height="wrap_content" /> <TextView android:layout_width="match_parent" android:text="XML實現陰影效果" android:layout_gravity="center" android:gravity="center" android:textSize="18sp" android:shadowColor="@color/colorPrimary" android:shadowDx="5" android:shadowDy="5" android:shadowRadius="5" android:layout_height="wrap_content" /> </LinearLayout>

效果: