Graphics简单汇总

1、主页面布局文件

activity_main.xml（仅仅有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="測试图片处理" />
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:onClick="testDraw"
        android:text="測试绘制图形" />
</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 {
	@Override
	protected 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

上图布局文件例如以下

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="測试Bitmap" />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="<span style="color:#ff0000;">testMatrix</span>"
        android:text="測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button" 
        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button"
        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;
/*
 * 測试操作图片的Activity
 */
public class TuPianTestActivity extends Activity {

	@Override
	protected 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: 载入一张图片数据到内存中, 都能够封装成一个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;

	@Override
	protected 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: 载入资源文件里的图片资源并显示
		iv_bitmap1.setImageResource(R.drawable.ic_launcher);
		
		//2: 使用bitmapfactory做--载入资源图片
		Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher);
		iv_bitmap2.setImageBitmap(bitmap);
		
		//载入存储空间的图片
		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;

	@Override
	protected 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;

	@Override
	protected 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));启动以下图片

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 {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// 显示自己定义视图
		setContentView(new MyView(this));
	}

	/**
	 * 自己定义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---參数是椭圆
			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 bottom
			shapeDrawable.setBounds(10, 10, 200, 100);
		}

		// 显示界面视图效果 画布
		@Override
		protected 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);
		}
	}
}