需要图片集和源码请点赞关注收藏后评论区留言~~~
一、卡片视图
随着手机越来越先进，开发者已经不满足简单地显示一张张图片，而要设计更多的花样，比如Android提供了一个卡片视图CardView，顾名思义它拥有卡片式的圆角边框，边框外缘有一圈阴影，边框内缘有一圈空白 使用卡片视图前要先修改build.gradle 引入以下依赖
implementation 'androidx.cardview:cardview:1.0.0'
常用方法如下
1：cardBackgroundColor 设置卡片边框的背景颜色
2：cardCornerRadius 设置卡片边框的圆角半径
3：cardElevation 设置卡片边缘的阴影高程
4：contentPadding 设置卡片边框的间隔
效果如下
可以调整圆角与阴影大小，改变视图效果。下拉框中可以选择
代码如下
Java类
package com.example.picture; import androidx.appcompat.app.AppCompatActivity; import androidx.cardview.widget.CardView; import android.os.Bundle; import android.view.View; import android.view.ViewGroup.MarginLayoutParams; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import com.example.picture.util.Utils; public class CardViewActivity extends AppCompatActivity { private CardView cv_card; // 声明一个卡片视图对象 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_card_view); cv_card = findViewById(R.id.cv_card); initCardSpinner(); // 初始化卡片类型下拉框 } // 初始化卡片类型下拉框 private void initCardSpinner() { ArrayAdapter<String> cardAdapter = new ArrayAdapter<>(this, R.layout.item_select, cardArray); Spinner sp_card = findViewById(R.id.sp_card); sp_card.setPrompt("请选择卡片类型"); sp_card.setAdapter(cardAdapter); sp_card.setOnItemSelectedListener(new CardSelectedListener()); sp_card.setSelection(0); } private String[] cardArray = {"圆角与阴影均为3", "圆角与阴影均为6", "圆角与阴影均为10", "圆角与阴影均为15", "圆角与阴影均为20"}; private int[] radiusArray = {3, 6, 10, 15, 20}; class CardSelectedListener implements AdapterView.OnItemSelectedListener { public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { int radius = Utils.dip2px(CardViewActivity.this, radiusArray[arg2]); cv_card.setRadius(radius); // 设置卡片视图的圆角半径 cv_card.setCardElevation(radius); // 设置卡片视图的阴影长度 MarginLayoutParams params = (MarginLayoutParams) cv_card.getLayoutParams(); // 设置布局参数的四周空白 params.setMargins(radius, radius, radius, radius); cv_card.setLayoutParams(params); // 设置卡片视图的布局参数 } public void onNothingSelected(AdapterView<?> arg0) {} } }
XML文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="40dp" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center" android:paddingLeft="5dp" android:text="卡片视图样式：" android:textColor="@color/black" android:textSize="17sp" /> <Spinner android:id="@+id/sp_card" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:spinnerMode="dialog" /> </LinearLayout> <androidx.cardview.widget.CardView android:id="@+id/cv_card" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center_horizontal|top" app:cardCornerRadius="3dp" app:cardElevation="3dp" app:contentPadding="20dp"> <ImageView android:id="@+id/iv_scene" android:layout_width="wrap_content" android:layout_height="250dp" android:src="@drawable/ylxs" /> </androidx.cardview.widget.CardView> </LinearLayout>
二、给图像添加装饰
虽然原样图片能够满足多数场合，但是有时需要给图片添加一些小装饰，比如添加图片边框，添加文字水印，添加图标水印等等，一般是利用画布工具Canvas来绘制图案，具体细节结合画笔工具Paint即可 Canvas常用方法如下
drawarc 绘制扇形或者弧形
drawBitmap 绘制位图
drawCircle 绘制圆形
drawLine 绘制直线
drawOval 绘制椭圆
drawPath 绘制路径
drawPoint 绘制点
drawRect 绘制矩形
drawRoundRect 绘制圆角矩形
drawText 绘制文字
效果如下
无装饰风格如下
添加了时间戳装饰如下
添加边框效果如下
代码如下
Java类
package com.example.picture; import androidx.appcompat.app.AppCompatActivity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import com.example.picture.util.DateUtil; import com.example.picture.widget.DecorateImageView; public class ImageDecorateActivity extends AppCompatActivity { private DecorateImageView div_scene; // 声明一个装饰视图对象 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_image_decorate); div_scene = findViewById(R.id.div_scene); initDecorateSpinner(); // 初始化装饰类型下拉框 } // 初始化装饰类型下拉框 private void initDecorateSpinner() { ArrayAdapter<String> decorateAdapter = new ArrayAdapter<>(this, R.layout.item_select, decorateNameArray); Spinner sp_decorate = findViewById(R.id.sp_decorate); sp_decorate.setPrompt("请选择装饰类型"); sp_decorate.setAdapter(decorateAdapter); sp_decorate.setOnItemSelectedListener(new DecorateSelectedListener()); sp_decorate.setSelection(0); } private String[] decorateNameArray = {"无装饰", "时间戳装饰", "标志图装饰", "相框装饰"}; class DecorateSelectedListener implements AdapterView.OnItemSelectedListener { public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { if (arg2 == 0) { // 无装饰 div_scene.showNone(); // 不显示任何装饰 } else if (arg2 == 1) { // 时间戳装饰 String text = DateUtil.getNowFullDateTime(); div_scene.showText(text, true); // 显示装饰文本 } else if (arg2 == 2) { // 标志图装饰 Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.flower_lotus); div_scene.showLogo(bitmap, true); // 显示装饰标志 } else if (arg2 == 3) { // 相框装饰 Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.photo_frame1); div_scene.showFrame(bitmap, true); // 显示装饰相框 } } public void onNothingSelected(AdapterView<?> arg0) {} } }
XML文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <LinearLayout android:layout_width="match_parent" android:layout_height="40dp" android:orientation="horizontal" > <TextView android:layout_width="wrap_content" android:layout_height="match_parent" android:paddingLeft="5dp" android:gravity="center" android:text="图像装饰类型：" android:textColor="@color/black" android:textSize="17sp" /> <Spinner android:id="@+id/sp_decorate" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:spinnerMode="dialog" /> </LinearLayout> <com.example.picture.widget.DecorateImageView android:id="@+id/div_scene" android:layout_width="match_parent" android:layout_height="270dp" android:src="@drawable/ylxs" /> </LinearLayout>
创作不易 觉得有帮助请点赞关注收藏~~~
