由于android 7.0新增了动态权限，所以我们在做拍照和相册选取功能的时候，需要申请添加动态权限

实现效果图：

（1）在res目录下，新建xml文件夹 ，在xml文件夹中新建一个filepaths.xml

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

（2）去清单文件里面添加权限 AndroidManifest.xml，拍照和选照片权限只加这一个即可，多加错加均会导致程序报错

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

（3）添加provider，注意provider红色部分为当前项目包名，黑色部分为xml文件夹中filepaths文件名

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

（4）主界面的布局 activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:src="@mipmap/ic_launcher" android:layout_width="200dp" android:layout_height="200dp" android:id="@+id/ivView"/> <Button android:text="拍照" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/button"/> <Button android:text="从相册选取图片" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/take_button"/></LinearLayout>

（5）在MainActivity中动态申请权限，并且调用系统相机和相册

public class MainActivity extends Activity{ private static int REQUEST_CAMERA =1; private static int IMAGE_REQUEST_CODE =2; private File file; private Button button,take_button; private ImageView imageView; private String paths; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test); button = (Button)findViewById(R.id.button); take_button = (Button)findViewById(R.id.take_button); imageView = (ImageView)findViewById(R.id.ivView); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { applyWritePermission(); } }); take_button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { getPhoto(); } }); } private void useCamera() { Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/test/" + System.currentTimeMillis() + ".jpg"); file.getParentFile().mkdirs(); //改变Uri com.xykj.customview.fileprovider注意和xml中的一致 Uri uri = FileProvider.getUriForFile(this, "com.gjp.activity.teste.fileprovider", file); //添加权限 intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); startActivityForResult(intent, REQUEST_CAMERA); } private void getPhoto(){ //在这里跳转到手机系统相册里面 Intent intent = new Intent( Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, IMAGE_REQUEST_CODE); } public void applyWritePermission() { String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE}; if (Build.VERSION.SDK_INT >= 23) { int check = ContextCompat.checkSelfPermission(this, permissions[0]); // 权限是否已经 授权 GRANTED---授权 DINIED---拒绝 if (check == PackageManager.PERMISSION_GRANTED) { useCamera(); } else { requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1); } } else { useCamera(); } } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if (requestCode == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { useCamera(); } else { // 没有获取 到权限，从新请求，或者关闭app Toast.makeText(this, "需要存储权限", Toast.LENGTH_SHORT).show(); } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == REQUEST_CAMERA && resultCode == RESULT_OK) { Log.e("TAG", "---------" + FileProvider.getUriForFile(this, "com.gjp.activity.teste.fileprovider", file)); imageView.setImageBitmap(BitmapFactory.decodeFile(file.getAbsolutePath())); //在手机相册中显示刚拍摄的图片 Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri contentUri = Uri.fromFile(file); mediaScanIntent.setData(contentUri); sendBroadcast(mediaScanIntent); } if (requestCode == IMAGE_REQUEST_CODE && resultCode == RESULT_OK) { try { Uri selectedImage = data.getData(); //获取系统返回的照片的Uri String[] filePathColumn = {MediaStore.Images.Media.DATA}; Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);//从系统表中查询指定Uri对应的照片 cursor.moveToFirst(); int columnIndex = cursor.getColumnIndex(filePathColumn[0]); paths = cursor.getString(columnIndex); //获取照片路径 cursor.close(); Bitmap bitmap = BitmapFactory.decodeFile(paths); imageView.setImageBitmap(bitmap); } catch (Exception e) { e.printStackTrace(); } } }}

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