Android7.0实现拍照和相册选取图片功能

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

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

<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>

<?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>

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();   } } }}