Android如何实现拍照及图片裁剪

这篇文章主要介绍Android如何实现拍照及图片裁剪，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

最近做项目中涉及到了图片相关功能 ，在使用安卓6.0手机及7.1手机拍照时，遇到了因权限及文件管理导致程序崩溃等问题。
 刚好把功能修改完，把代码简单地贴一下，方便以后使用。

—-主界面 代码 ——

public class MainActivity extends AppCompatActivity {  //拍照按钮  private Button take_photo;  //显示裁剪后的图片  private ImageView photo_iv;  private static final int PERMISSioNS_FOR_TAKE_PHOTO = 10;  //图片文件路径  private String picPath;  //图片对应Uri  private Uri photoUri;  //拍照对应RequestCode  public static final int SELECT_PIC_BY_TACK_PHOTO = 1;  //裁剪图片  private static final int CROP_PICTURE = 3;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    take_photo = (Button) findViewById(R.id.take_photo);    photo_iv = (ImageView) findViewById(R.id.photo_iv);    take_photo.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View view) {        //小于6.0版本直接操作        if (Build.VERSION.SDK_INT < 23) {          takePictures();        } else {          //6.0以后权限处理          permissionFORM();        }      }    });  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {    super.onActivityResult(requestCode, resultCode, data);    if (resultCode == Activity.RESULT_OK) {      if (requestCode == SELECT_PIC_BY_TACK_PHOTO) {        String[] pojo = {MediaStore.Images.Media.DATA};        Cursor cursor = managedQuery(photoUri, pojo, null, null, null);        if (cursor != null) {          int columnIndex = cursor.getColumnIndexOrThrow(pojo[0]);          cursor.moveToFirst();          picPath = cursor.getString(columnIndex);          if (Build.VERSION.SDK_INT < 14) {            cursor.close();          }        }        if (picPath != null && (picPath.endsWith(".png") || picPath.endsWith(".PNG") || picPath.endsWith(".jpg") || picPath.endsWith(".JPG"))) {          photoUri = Uri.fromFile(new File(picPath));          if (Build.VERSION.SDK_INT > 23) {            photoUri = FileProvider.getUriForFile(this, "com.innopro.bamboo.fileprovider", new File(picPath));            cropForN(picPath, CROP_PICTURE);          } else {            startPhotoZoom(photoUri, CROP_PICTURE);          }        } else {          //错误提示        }      }      if (requestCode == CROP_PICTURE) {        if (photoUri != null) {          Bitmap bitmap = BitmapFactory.decodeFile(picPath);          if (bitmap != null) {            photo_iv.setImageBitmap(bitmap);          }        }      }    }  }    private void takePictures() {    //执行拍照前，应该先判断SD卡是否存在    String SDState = Environment.getExternalStorageState();    if (SDState.equals(Environment.MEDIA_MOUNTED)) {      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);      ContentValues values = new ContentValues();      photoUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);      intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);      startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO);    } else {      Toast.makeText(this, "手机未插入内存卡", Toast.LENGTH_LONG).show();    }  }    private void startPhotoZoom(Uri uri,                int REQUE_CODE_CROP) {    int dp = 500;    Intent intent = new Intent("com.android.camera.action.CROP");    intent.setDataAndType(uri, "image  private void cropForN(String imagePath, int REQUE_CODE_CROP) {    Uri cropUri = getImageContentUri(new File(imagePath));    Intent intent = new Intent("com.android.camera.action.CROP");    intent.setDataAndType(cropUri, "image  private void permissionForM() {    if (ContextCompat.checkSelfPermission(this,        Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this,        Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this,        Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {      ActivityCompat.requestPermissions(this,          new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},          PERMISSIONS_FOR_TAKE_PHOTO);    } else {      takePictures();    }  }  @Override  public void onRequestPermissionsResult(int requestCode,                      @NonNull String[] permissions, @NonNull int[] grantResults) {    if (requestCode == PERMISSIONS_FOR_TAKE_PHOTO) {      if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {        takePictures();      }      return;    }    super.onRequestPermissionsResult(requestCode, permissions, grantResults);  }}

–主界面布局——–

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="Http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context="com.innopro.improve.MainActivity">  <Button    android:id="@+id/take_photo"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="拍照"    android:textSize="18sp"    app:layout_constraintLeft_toLeftOf="parent"    app:layout_constraintRight_toRightOf="parent"    app:layout_constraintTop_toTopOf="parent" />  <ImageView    android:id="@+id/photo_iv"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:src="@mipmap/ic_launcher"    app:layout_constraintLeft_toLeftOf="parent"    app:layout_constraintRight_toRightOf="parent"    app:layout_constraintTop_toBottomOf="@id/take_photo" /></android.support.constraint.ConstraintLayout>

–AndroidManifest.xml添加provider——–

   <provider      android:name="android.support.v4.content.FileProvider"      android:authorities="com.innopro.improve.fileprovider"      android:exported="false"      android:grantUriPermissions="true">      <meta-data        android:name="android.support.FILE_PROVIDER_PATHS"        android:resource="@xml/file_paths" />    </provider>

–资源文件下添加xml文件夹及file_paths文件——–

<?xml version="1.0" encoding="utf-8"?><resources>  <paths>    <external-path      name="camera_photos"      path="" />  </paths></resources>

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