java 安卓截取图片_Android实现图片裁剪

悠悠 2022-11-03 16:22 9阅读 0赞

![1715aba59d8579234d8e829fd13eaa19.png][]

![af901ba8a960da2862cab336b11e897a.png][]

MainActivity.java

package com.kale.imagetailor;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import android.app.Activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.drawable.BitmapDrawable;

import android.net.Uri;

import android.os.Bundle;

import android.provider.MediaStore;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

public class MainActivity extends Activity \{

private String tag = getClass().getSimpleName();

private static Uri imageUri;

Button imageTailorBt;

ImageView userIV;

File file;

FileManager fm;

@Override

protected void onCreate(Bundle savedInstanceState) \{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity\_main);

viewInit();

fm = new FileManager();

try \{

file = fm.creatSDFile("Kale Image", "userImage.jpg");

\} catch (IOException e) \{

// TODO 自动生成的 catch 块

e.printStackTrace();

/\*\*

\*每次开启时判断设置什么图片，如果有自定义的图片了，那么就用用户自己的头像

\*/

private void setUserImage()\{

userIV.setImageResource(R.drawable.ic\_launcher);

//从sd卡中得到图片资源

String filepath = fm.getFileWholePath();

Bitmap bm = BitmapFactory.decodeFile(filepath);

if(bm != null)\{

//BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。

userIV.setImageDrawable(new BitmapDrawable(bm));

else\{

userIV.setImageResource(R.drawable.ic\_launcher);

private void viewInit()\{

userIV = (ImageView)findViewById(R.id.user\_imageView\_id);

imageTailorBt = (Button)findViewById(R.id.image\_tailer\_button\_id);

imageTailorBt.setOnClickListener(new OnClickListener() \{

@Override

public void onClick(View arg0) \{

// TODO 自动生成的方法存根

changeUserImage();

\});

/\*\*

\*改变用户头像的方法，这里设定一个intent交给activity去处理

\*/

protected void changeUserImage()\{

Toast.makeText(getApplicationContext(), "更换头像", 0).show();

imageUri = Uri.parse("file:///sdcard/temp.jpg");

Intent intent = null;

intent = new Intent(Intent.ACTION\_GET\_CONTENT, null);

intent.setType("image/\*");// 设置属性，表示获取任意类型的图片

intent.putExtra("crop", "true");// 设置可以滑动选选择区域的属性,注意这里是字符串"true"

intent.putExtra("aspectX", 1);// 设置剪切框1:1比例的效果

intent.putExtra("aspectY", 1);// 设置剪切框1:1比例的效果

intent.putExtra("outputX", 600);

intent.putExtra("outputY", 600);

intent.putExtra("scale", true);

intent.putExtra("return-data", false);

intent.putExtra(MediaStore.EXTRA\_OUTPUT,imageUri);

intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());

intent.putExtra("noFaceDetection", false); // no face detection

startActivityForResult(intent, 1);

/\*\*

\* @param uri

\* @return 一个bitmap对象，用来设置图片

\*/

private Bitmap decodeUriAsBitmap(Uri uri)\{

Bitmap bitmap = null;

try \{

bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));

\} catch (FileNotFoundException e) \{

e.printStackTrace();

return null;

return bitmap;

/\*\*

\* 用来设置图片，并保持的本地

\*/

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) \{

super.onActivityResult(requestCode, resultCode, data);

//不正确的情况下

if(resultCode != Activity.RESULT\_OK)\{

Log.e(tag, "requestCode = " + requestCode);

Log.e(tag, "resultCode = " + resultCode);

Log.e(tag, "data = " + data);

return;

else\{

Log.d(tag, "CHOOSE\_A\_BIG\_PICTURE: data = " + data);

if(imageUri != null)\{

Bitmap photo = decodeUriAsBitmap(imageUri);

try \{

//保存到本地文件

File pictureFile = file;

FileOutputStream fos = new FileOutputStream(pictureFile);

photo.compress(Bitmap.CompressFormat.JPEG, 100, fos);

fos.close();

Toast.makeText(this, "设置成功~", 0).show();

\} catch (FileNotFoundException e) \{

e.printStackTrace();

Toast.makeText(this, "保存路径不存在", 0).show();

\} catch (IOException e) \{

e.printStackTrace();

Toast.makeText(this, "设置图片失败", 0).show();

setUserImage();

FileManager.java

package com.kale.imagetailor;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import android.os.Environment;

/\*\*

\* @tips :

\* @date :2014-6-30

\*/

public class FileManager \{

private String SD\_PATH;

private String fileName;

private String dirName;

public String getSD\_PATH() \{

return SD\_PATH;

public FileManager() \{

//得到当前外部存储设备的目录

SD\_PATH = Environment.getExternalStorageDirectory() + "/";

/\*\*

\* 在SD卡上创建文件

\* @throws IOException

\*/

public File creatSDFile(String dirName ,String fileName) throws IOException \{

this.fileName = fileName;

this.dirName = dirName;

File file = new File(creatSDDir(dirName), fileName);

return file;

public String getFileWholePath()\{

return SD\_PATH + dirName + "/" + fileName;

/\*\*

\* 在SD卡上创建目录

\* @param dirName

\*/

public File creatSDDir(String dirName) \{

File dir = new File(SD\_PATH + dirName);

dir.mkdir();

return dir;

/\*\*

\* 判断SD卡上的文件夹是否存在

\*/

public boolean isFileExist(String fileName ,String dirName)\{

File file = new File(SD\_PATH +dirName+"/"+ fileName);

return file.exists();

/\*\*

\* 将一个InputStream里面的数据写入到SD卡中

\*/

public File saveToSdCard(String dirName,String fileName,InputStream input)\{

File file = null;

OutputStream output = null;

try\{

//创建目录

creatSDDir(dirName);

//建立文件

file = creatSDFile(dirName ,fileName);

output = new FileOutputStream(file);

byte buffer \[\] = new byte\[5 \* 1024\];

int count = 0;

while((count = input.read(buffer)) != -1)\{

String str = new String(buffer,0,count);

//str = new String(str.getBytes("iso-8859-1"),"utf-8");

System.out.println("---------File Manager----start--------");

System.out.println(str);

System.out.println("---------File Manager-----end-------");

output.write(buffer);

output.flush();

catch(Exception e)\{

e.printStackTrace();

finally\{

try\{

output.close();

catch(Exception e)\{

e.printStackTrace();

return file;

main\_activity.xml

xmlns:tools="http://schemas.android.com/tools"

android:layout\_width="match\_parent"

android:layout\_height="match\_parent"

tools:context="$\{relativePackage\}.$\{activityClass\}" >

android:id="@+id/image\_tailer\_button\_id"

android:layout\_width="wrap\_content"

android:layout\_height="wrap\_content"

android:layout\_centerHorizontal="true"

android:layout\_centerVertical="true"

android:text="裁剪图片" />

android:id="@+id/user\_imageView\_id"

android:layout\_width="300dp"

android:layout\_height="300dp"

android:layout\_above="@+id/image\_tailer\_button\_id"

android:layout\_centerHorizontal="true"

android:layout\_marginBottom="100dp"

android:src="@drawable/ic\_launcher" />

[1715aba59d8579234d8e829fd13eaa19.png]: /images/20221023/39a09ec83c0c4abeab8d1adeabe33fd5.png
[af901ba8a960da2862cab336b11e897a.png]: /images/20221023/b533abe73ff04cd6be57540754df1c99.png

java 安卓截取图片_Android实现图片裁剪

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