Graphics简单汇总

1、主页面布局文件

activity_main.xml（只有2个button按钮）

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical">    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:onClick="testTuPian"        android:text="测试图片处理" />    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:onClick="testDraw"        android:text="测试绘制图形" /></LinearLayout>

MainActivity.java（启动2个button）

package com.atguigu.l11_graphics;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}public void testTuPian(View view) {startActivity(new Intent(this, TuPianTestActivity.class));}public void testDraw(View view) {startActivity(new Intent(this, DrawTestActivity.class));}}

2、startActivity(new Intent(this, TuPianTestActivity.class));启动的界面

上图布局文件如下

activity_tupian_test.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick=<span style="color:#ff0000;">"testBD"</span>        android:text="测试Bitmap" />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="<span style="color:#ff0000;">testMatrix</span>"        android:text="测试图片的缩放等处理" />    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="使用Shape做的按钮"         android:background="@drawable/shape_test"/>    <ImageView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:background="@drawable/image_selector"         android:onClick="<span style="color:#ff0000;">clickIV</span>"/>    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="使用Selector+Shape做的按钮"        android:background="@drawable/shape_selector"/>    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="@drawable/test2"        android:text="A NinePatchDrawable graphic is a stretchable bitmap image, which Android will automatically resize to accommodate the contents of the View in which you have placed it as the background. A NinePatch drawable is a standard PNG image that includes an extra" /></LinearLayout>

TuPianTestActivity.java

package com.atguigu.l11_graphics;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Toast;/* * 测试操作图片的Activity */public class TuPianTestActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_tupian_test);}public void<span style="color:#ff0000;"> testBD</span>(View v) {startActivity(new Intent(this, BitmapTestActivity.class));}public void <span style="color:#ff0000;">testMatrix</span>(View v) {startActivity(new Intent(this, MatrixTestActivity.class));}public void <span style="color:#ff0000;">clickIV</span>(View v) {Toast.makeText(this, "点击了selector", 0).show();}}

3、将上图分开来看（从上到下依次展示布局文件或者代码）

3-1、activity_bitmap.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="保存图片"         android:onClick="saveImage"/>    <ImageView        android:id="@+id/iv_bitmap1"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />    <ImageView        android:id="@+id/iv_bitmap2"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />        <ImageView        android:id="@+id/iv_bitmap3"        android:layout_width="fill_parent"        android:layout_height="wrap_content" /></LinearLayout>

BitmapTestActivity.java

package com.atguigu.l11_graphics;import java.io.FileNotFoundException;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.CompressFormat;import android.graphics.BitmapFactory;import android.os.Bundle;import android.view.View;import android.widget.ImageView;/* Bitmap: 加载一张图片数据到内存中, 都可以封装成一个Bitmap对象 需求3: 将一个bitmap对象保存到存储空间中 */public class BitmapTestActivity extends Activity {private ImageView iv_bitmap1;private ImageView iv_bitmap2;private ImageView iv_bitmap3;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_bitmap);iv_bitmap1 = (ImageView) findViewById(R.id.iv_bitmap1);iv_bitmap2 = (ImageView) findViewById(R.id.iv_bitmap2);iv_bitmap3 = (ImageView) findViewById(R.id.iv_bitmap3);//1: 加载资源文件中的图片资源并显示iv_bitmap1.setImageResource(R.drawable.ic_launcher);//2: 使用bitmapfactory做--加载资源图片Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher);iv_bitmap2.setImageBitmap(bitmap);//加载存储空间的图片Bitmap bitmap2 = BitmapFactory.decodeFile("/storage/sdcard/atguigu.png");iv_bitmap3.setImageBitmap(bitmap2);}/** * 讲bitmap对象保存到存储空间去 */data/data/包名/files/save.png */public void saveImage(View v) {Bitmap bitmap = BitmapFactory.decodeFile("/storage/sdcard/atguigu.png");try {bitmap.compress(CompressFormat.PNG, 100,openFileOutput("save.png", Context.MODE_PRIVATE));} catch (FileNotFoundException e) {e.printStackTrace();}}}

3-2、activity_matrix.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="50dip"        android:orientation="horizontal" >        <EditText            android:id="@+id/et_matrix_scale"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:text="0.25" />        <EditText            android:id="@+id/et_matrix_rotate"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:text="30" />        <EditText            android:id="@+id/et_matrix_translateX"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:text="10" />        <EditText            android:id="@+id/et_matrix_translateY"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:text="10" />    </LinearLayout>    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="50dip"        android:orientation="horizontal" >        <Button            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:onClick="scaleBitmap"            android:text="缩放" />        <Button            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:onClick="rotateBitmap"            android:text="旋转" />        <Button            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:onClick="translateBitmap"            android:text="移动" />        <Button            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:onClick="clearMatrix"            android:text="还原" />    </LinearLayout>    <ImageView        android:id="@+id/iv_matrix_icon"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/ic_launcher"         android:scaleType="matrix"/></LinearLayout>

MatrixTestActivity.java

package com.atguigu.l11_graphics;import android.app.Activity;import android.graphics.Matrix;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.ImageView;/* Matrix ，中文里叫矩阵，高等数学里有介绍，在图像处理方面，主要是用于平面的缩放、平移、旋转等操作 */public class MatrixTestActivity extends Activity {private EditText et_matrix_scale;private EditText et_matrix_rotate;private EditText et_matrix_translateX;private EditText et_matrix_translateY;private ImageView iv_matrix_icon;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_matrix);et_matrix_scale = (EditText) findViewById(R.id.et_matrix_scale);et_matrix_rotate = (EditText) findViewById(R.id.et_matrix_rotate);et_matrix_translateX = (EditText) findViewById(R.id.et_matrix_translateX);et_matrix_translateY = (EditText) findViewById(R.id.et_matrix_translateY);iv_matrix_icon = (ImageView) findViewById(R.id.iv_matrix_icon);}/** * 缩放图片 */Matrix matrix = new Matrix();public void scaleBitmap(View view) {// 得到缩放比例--float类型float sacle = Float.parseFloat(et_matrix_scale.getText().toString());// 对缩放图片对象设置xy轴缩放比例matrix.postScale(sacle, sacle);iv_matrix_icon.setImageMatrix(matrix);}/** * 旋转图片 */public void rotateBitmap(View view) {float degrees = Float.parseFloat(et_matrix_rotate.getText().toString());matrix.postRotate(degrees);iv_matrix_icon.setImageMatrix(matrix);}/** * 移动图片 */public void translateBitmap(View view) {float dx = Float.parseFloat(et_matrix_translateX.getText().toString());float dy = Float.parseFloat(et_matrix_translateY.getText().toString());matrix.postTranslate(dx, dy);iv_matrix_icon.setImageMatrix(matrix);}/** * 还原操作 */public void clearMatrix(View view) {//清除数据matrix.reset();iv_matrix_icon.setImageMatrix(matrix);}}

MatrixTestActivity.java

package com.atguigu.l11_graphics;import android.app.Activity;import android.graphics.Matrix;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.ImageView;/* Matrix ，中文里叫矩阵，高等数学里有介绍，在图像处理方面，主要是用于平面的缩放、平移、旋转等操作 */public class MatrixTestActivity extends Activity {private EditText et_matrix_scale;private EditText et_matrix_rotate;private EditText et_matrix_translateX;private EditText et_matrix_translateY;private ImageView iv_matrix_icon;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_matrix);et_matrix_scale = (EditText) findViewById(R.id.et_matrix_scale);et_matrix_rotate = (EditText) findViewById(R.id.et_matrix_rotate);et_matrix_translateX = (EditText) findViewById(R.id.et_matrix_translateX);et_matrix_translateY = (EditText) findViewById(R.id.et_matrix_translateY);iv_matrix_icon = (ImageView) findViewById(R.id.iv_matrix_icon);}/** * 缩放图片 */Matrix matrix = new Matrix();public void scaleBitmap(View view) {// 得到缩放比例--float类型float sacle = Float.parseFloat(et_matrix_scale.getText().toString());// 对缩放图片对象设置xy轴缩放比例matrix.postScale(sacle, sacle);iv_matrix_icon.setImageMatrix(matrix);}/** * 旋转图片 */public void rotateBitmap(View view) {float degrees = Float.parseFloat(et_matrix_rotate.getText().toString());matrix.postRotate(degrees);iv_matrix_icon.setImageMatrix(matrix);}/** * 移动图片 */public void translateBitmap(View view) {float dx = Float.parseFloat(et_matrix_translateX.getText().toString());float dy = Float.parseFloat(et_matrix_translateY.getText().toString());matrix.postTranslate(dx, dy);iv_matrix_icon.setImageMatrix(matrix);}/** * 还原操作 */public void clearMatrix(View view) {//清除数据matrix.reset();iv_matrix_icon.setImageMatrix(matrix);}}

3-3、

shape_test.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" >    <!-- 半径大小 -->    <corners android:radius="10dp" />    <!-- 边框 -->    <stroke        android:dashGap="2dp"        android:dashWidth="2dp"        android:width="3dp"        android:color="#FF7F00" />    <size        android:height="50dp"        android:width="40dp" /><!-- 颜色 -->    <solid android:color="#FFD700"></solid>        <!-- 覆盖solid -->    <gradient        android:startColor="#ffffff"        android:centerColor="#EE4000"        android:endColor="#ffffff"        android:angle="90"/></shape>

3-4、

image_selector.xml

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >    <!-- 特别的状态放在前面 --><item android:drawable="@drawable/main_index_search_pressed"  android:state_pressed="true"/>    <item android:drawable="@drawable/main_index_search_normal"/></selector>

3-5、

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >    <item android:state_pressed="true">        <shape>            <corners android:radius="4dp"></corners>            <stroke android:width="2dp" android:color="#EEAD0E" android:dashWidth="4dp" android:dashGap="2dp"></stroke>            <size android:height="40dp"></size>            <gradient android:startColor="#ffffff" android:centerColor="#ffffff" android:endColor="#E0FFFF"/>        </shape>    </item>        <item>        <shape>            <corners android:radius="2dp"></corners>            <stroke android:width="2dp" android:color="#EE7AE9"></stroke>            <size android:height="40dp"></size>            <solid android:color="#E0FFFF"></solid>        </shape>    </item></selector>

3-6、（9patch图片）

4、startActivity(new Intent(this, DrawTestActivity.class));启动下面图片

DrawTestActivity.java

package com.atguigu.l11_graphics;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.drawable.ShapeDrawable;import android.graphics.drawable.shapes.OvalShape;import android.os.Bundle;import android.view.View;public class DrawTestActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 显示自定义视图setContentView(new MyView(this));}/** * 自定义myview视图 */private class MyView extends View {//成员变量---可画的图形对象private ShapeDrawable shapeDrawable;public MyView(Context context) {super(context);// 初始化一个图形对象---参数是椭圆shapeDrawable = new ShapeDrawable(new OvalShape());// 通过椭圆得到画笔，通过画笔设置颜色shapeDrawable.getPaint().setColor(Color.RED);// 指定位置left top right bottomshapeDrawable.setBounds(10, 10, 200, 100);}// 显示界面视图效果 画布@Overrideprotected void onDraw(Canvas canvas) {//设置画布的颜色canvas.drawColor(Color.GREEN);// 将图像画到画布上shapeDrawable.draw(canvas);//指定画笔Paint paint = new Paint();//通过画笔设置颜色paint.setColor(Color.BLUE);//设置字体大小paint.setTextSize(30);//设置平滑度paint.setAntiAlias(true);//在画布上写上字体canvas.drawText("你好", 10, 200, paint);}}}