接到一个小需求，要求实现类似截取头像的图片 裁剪 的功能！时间要求很紧，所以就上看了几个小Demo。虽然原理不难，但是真正好用的没有几个。在一堆烂苹果里找到一个最不烂的。然后又自己修改了一下，达到了预期需求实现！
部局部分：
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:orientation="vertical" > 6 7 <Button 8 android:id="@+id/selectImageBtn" 9 android:layout_width="fill_parent" 10 android:layout_height="wrap_content" 11 android:text="选择图片" /> 12 13 <ImageView 14 android:id="@+id/imageView" 15 android:layout_width="wrap_content" 16 android:layout_height="wrap_content" /> 17 18 </LinearLayout>
Activity部分：
1 import android.app.Activity; 2 import android.app.AlertDialog; 3 import android.content.DialogInterface; 4 import android.content.Intent; 5 import android.graphics.Bitmap; 6 import android.graphics.BitmapFactory; 7 import android.net.Uri; 8 import android.os.Bundle; 9 import android.os.Environment; 10 import android.provider.MediaStore; 11 import android.view.View; 12 import android.widget.Button; 13 import android.widget.ImageView; 14 15 public class DoPhotoActivity extends Activity implements 16 View.OnClickListener { 17 18 /** Called when the activity is first created. */ 19 20 private Button selectImageBtn; 21 22 private ImageView imageView; 23 24 private File sdcardTempFile; 25 26 private AlertDialog dialog; 27 28 private int crop = 128; 29 30 private static final int PHOTO_PICKED_WITH_DATA = 3021; 31 32 private static final int PHOTO_CAMERA_PICKED_WITH_DATA = 3022; 33 34 private static final int CAMERA_WITH_DATA = 3023; 35 36 @Override 37 public void onCreate(Bundle savedInstanceState) { 38 39 super.onCreate(savedInstanceState); 40 41 setContentView(R.layout.do_photo); 42 43 selectImageBtn = (Button) findViewById(R.id.selectImageBtn); 44 45 imageView = (ImageView) findViewById(R.id.imageView); 46 47 selectImageBtn.setOnClickListener(this); 48 49 sdcardTempFile = new File(Environment.getExternalStorageDirectory() 50 + "/MYIMAGE/" + String.valueOf(System.currentTimeMillis()) 51 + ".jpg"); 52 } 53 54 public void ImageScale() { 55 56 Intent intent = new Intent("android.intent.action.PICK"); 57 intent.setDataAndType(MediaStore.Images.Media.INTERNAL_CONTENT_URI, 58 "image/*"); 59 intent.putExtra("output", Uri.fromFile(sdcardTempFile)); 60 intent.putExtra("crop", "true"); 61 intent.putExtra("aspectX", 1);// 裁剪框比例 62 intent.putExtra("aspectY", 1); 63 intent.putExtra("outputX", crop);// 输出图片大小 64 intent.putExtra("outputY", crop); 65 startActivityForResult(intent, PHOTO_PICKED_WITH_DATA); 66 } 67 68 public void photo() { 69 70 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 71 startActivityForResult(intent, CAMERA_WITH_DATA); 72 } 73 74 protected void doCropPhoto(Bitmap data) { 75 76 Intent intent = getCropImageIntent(data); 77 startActivityForResult(intent, PHOTO_CAMERA_PICKED_WITH_DATA); 78 } 79 80 public Intent getCropImageIntent(Bitmap data) { 81 Intent intent = new Intent("com.android.camera.action.CROP"); 82 intent.setType("image/*"); 83 intent.putExtra("data", data); 84 intent.putExtra("crop", "true"); 85 intent.putExtra("aspectX", 1); 86 intent.putExtra("aspectY", 1); 87 intent.putExtra("outputX", crop); 88 intent.putExtra("outputY", crop); 89 intent.putExtra("return-data", true); 90 return intent; 91 } 92 93 @Override 94 public void onClick(View v) { 95 96 if (v == selectImageBtn) { 97 98 if (dialog == null) { 99 100 dialog = new AlertDialog.Builder(this).setItems( 101 new String[] { "相机", "相册" }, 102 new DialogInterface.OnClickListener() { 103 104 @Override 105 public void onClick(DialogInterface dialog, 106 int which) { 107 108 if (which == 0) { 109 110 photo(); 111 112 } else { 113 ImageScale(); 114 } 115 116 } 117 118 }).create(); 119 120 } 121 122 if (!dialog.isShowing()) { 123 124 dialog.show(); 125 126 } 127 128 } 129 130 } 131 132 @Override 133 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 134 135 if (resultCode == RESULT_OK) { 136 137 switch (requestCode) { 138 139 case CAMERA_WITH_DATA: 140 141 Bitmap camera_photo = data.getParcelableExtra("data"); 142 doCropPhoto(camera_photo); 143 144 145 case PHOTO_PICKED_WITH_DATA: 146 147 Bitmap picked_photo = BitmapFactory.decodeFile(sdcardTempFile.getAbsolutePath()); 148 imageView.setImageBitmap(picked_photo); 149 break; 150 151 case PHOTO_CAMERA_PICKED_WITH_DATA: 152 153 Bitmap camera_picked_photo = data.getParcelableExtra("data"); 154 imageView.setImageBitmap(camera_picked_photo); 155 break; 156 157 } 158 159 } 160 161 } 162 }