Android编程实现图片拍照剪裁的方法

本文实例讲述了android实现图片拍照剪裁的方法。分享给大家供大家参考，具体如下：

调用系统的裁剪工具对相册或者拍照的图片进行裁剪。

startactivityforresult用的很恰当，一些系统action需要注意。

package com.photosizing;
import java.io.bytearrayoutputstream;
import java.io.file;
import android.app.activity;
import android.content.intent;
import android.graphics.bitmap;
import android.net.uri;
import android.os.bundle;
import android.os.environment;
import android.provider.mediastore;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.imageview;
public class testactivity extends activity {
 public static final int none = 0;
 public static final int photohraph = 1;// 拍照
 public static final int photozoom = 2; // 缩放
 public static final int photoresoult = 3;// 结果
 public static final string image_unspecified = "image/*";
 imageview imageview = null;
 button button0 = null;
 button button1 = null;
 @override
 public void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.main);
  imageview = (imageview) findviewbyid(r.id.imageid);
  button0 = (button) findviewbyid(r.id.btn_01);
  button1 = (button) findviewbyid(r.id.btn_02);
  button0.setonclicklistener(new onclicklistener() {
   @override
   public void onclick(view v) {
    intent intent = new intent(intent.action_pick, null);
    intent.setdataandtype(
      mediastore.images.media.external_content_uri, 
      image_unspecified);
    startactivityforresult(intent, photozoom);
   }
  });
  button1.setonclicklistener(new onclicklistener() {
   @override
   public void onclick(view v) {
    intent intent = new intent(mediastore.action_image_capture);
    intent.putextra(mediastore.extra_output, uri.fromfile(new file(
      environment.getexternalstoragedirectory(), "temp.jpg")));
    startactivityforresult(intent, photohraph);
   }
  });
 }
 @override
 protected void onactivityresult(int requestcode, int resultcode, intent data) {
  if (resultcode == none)
   return;
  if (data == null)
   return;
  // 拍照
  if (requestcode == photohraph) {
   // 设置文件保存路径这里放在跟目录下
   file picture = new file(environment.getexternalstoragedirectory()
     + "/temp.jpg");
   startphotozoom(uri.fromfile(picture));
  }
  // 读取相册缩放图片
  if (requestcode == photozoom) {
   startphotozoom(data.getdata());
  }
  // 处理结果
  if (requestcode == photoresoult) {
   bundle extras = data.getextras();
   if (extras != null) {
    bitmap photo = extras.getparcelable("data");
    bytearrayoutputstream stream = new bytearrayoutputstream();
    photo.compress(bitmap.compressformat.jpeg, 75, stream);
    // (0 - 100)压缩文件
    imageview.setimagebitmap(photo);
   }
  }
  super.onactivityresult(requestcode, resultcode, data);
 }
 public void startphotozoom(uri uri) {
  intent intent = new intent("com.android.camera.action.crop");
  intent.setdataandtype(uri, image_unspecified);
  intent.putextra("crop", "true");
  // aspectx aspecty 是宽高的比例
  intent.putextra("aspectx", 1);
  intent.putextra("aspecty", 1);
  // outputx outputy 是裁剪图片宽高
  intent.putextra("outputx", 64);
  intent.putextra("outputy", 64);
  intent.putextra("return-data", true);
  startactivityforresult(intent, photoresoult);
 }
}

xml文件：

<?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">
 <textview android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="@string/hello" />
<imageview android:id="@+id/imageid"
android:adjustviewbounds="true" android:maxwidth="50dip"
android:maxheight="50dip" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<button android:id="@+id/btn_01" android:layout_height="50dip"
android:text="相册" android:layout_width="150dip"/>
<button android:id="@+id/btn_02" android:layout_height="50dip"
 android:text="拍照" android:layout_width="150dip"/>
</linearlayout>

希望本文所述对大家android程序设计有所帮助。