Android编程实现图片拍照剪裁的方法

前端技术 2023/09/01 Android

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。

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