1.布局是两个button一个是打开相机，一个是打开相册
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/takePhoto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="打开相机"/>
<Button
android:id="@+id/glary"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="打开相册"
/>
<ImageView
android:id="@+id/images"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"/>
</LinearLayout>2.在MainActivity动态申请相关权限
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final String TAG = "MainActivity";
private Button takePhoto;
private Button glary;
private ImageView image;
private static final int CODE_GALLERY_REQUEST = 0xa0;
private static final int CODE_CAMERA_REQUEST = 0xa1;
private static final int CODE_RESULT_REQUEST = 0xa2;
private static final int CAMERA_PERMISSIONS_REQUEST_CODE = 0x03;
private static final int STORAGE_PERMISSIONS_REQUEST_CODE = 0x04;
private File fileUri = new File(Environment.getExternalStorageDirectory().getPath() + "/photo.jpg");
private File fileCropUri = new File(Environment.getExternalStorageDirectory().getPath() + "/crop_photo.jpg");
private Uri imageUri;
private Uri cropImageUri;
private Bitmap bitmap;
private Bitmap mBitmapFromUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
takePhoto = (Button) findViewById(R.id.takePhoto);
glary = (Button) findViewById(R.id.glary);
image = (ImageView) findViewById(R.id.images);
takePhoto.setOnClickListener(this);
glary.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.takePhoto:
autoObtainCameraPermission();
break;
case R.id.glary:
autoObtainStoragePermission();
//保存图片
break;
default:
}
}
/**
* 自动获取相机权限
*/
private void autoObtainCameraPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED
|| ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
|| ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {
ToastUtils.showShort(this, "您已经拒绝过一次");
}
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE}, CAMERA_PERMISSIONS_REQUEST_CODE);
} else {//有权限直接调用系统相机拍照
if (hasSdcard()) {
imageUri = Uri.fromFile(fileUri);
//通过FileProvider创建一个content类型的Uri
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
imageUri = FileProvider.getUriForFile(MainActivity.this, "com.zzz.fileproviders", fileUri);
}
PhotoUtils.takePicture(this, imageUri, CODE_CAMERA_REQUEST);
} else {
ToastUtils.showShort(this, "设备没有SD卡！");
}
}
}
/**
* 自动获取sdk权限
*/
private void autoObtainStoragePermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSIONS_REQUEST_CODE);
} else {
PhotoUtils.openPic(this, CODE_GALLERY_REQUEST);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
//调用系统相机申请拍照权限回调
case CAMERA_PERMISSIONS_REQUEST_CODE: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (hasSdcard()) {
imageUri = Uri.fromFile(fileUri);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
imageUri = FileProvider.getUriForFile(MainActivity.this, "com.zzz.fileproviders", fileUri);//通过FileProvider创建一个content类型的Uri
PhotoUtils.takePicture(this, imageUri, CODE_CAMERA_REQUEST);
} else {
ToastUtils.showShort(this, "设备没有SD卡！");
}
} else {
ToastUtils.showShort(this, "请允许打开相机！！");
}
break;
}
//调用系统相册申请Sdcard权限回调
case STORAGE_PERMISSIONS_REQUEST_CODE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
PhotoUtils.openPic(this, CODE_GALLERY_REQUEST);
} else {
ToastUtils.showShort(this, "请允许打操作SDCard！！");
}
break;
default:
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
switch (requestCode) {
//拍照完成回调
case CODE_CAMERA_REQUEST:
Uri uri = Uri.fromFile(fileUri);
mBitmapFromUri = PhotoUtils.getBitmapFromUri(uri, this);
// image.setImageBitmap(mBitmapFromUri);
Log.e(TAG, Environment.getExternalStorageState());
//TODO : 拍照完成后存到指定目录下
new Thread(new Runnable() {
@Override
public void run() {
saveBitmap(mBitmapFromUri);
}
}).start();
break;
//访问相册完成回调
case CODE_GALLERY_REQUEST:
if (hasSdcard()) {
Uri newUri = Uri.parse(PhotoUtils.getPath(this, data.getData()));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
newUri = FileProvider.getUriForFile(this, "com.zzz.fileproviders", new File(newUri.getPath()));
}
Bitmap bitmap = PhotoUtils.getBitmapFromUri(newUri, this);
image.setImageBitmap(bitmap);
} else {
ToastUtils.showShort(this, "设备没有SD卡！");
}
break;
case CODE_RESULT_REQUEST:
Uri uri2 = Uri.fromFile(fileUri);
Bitmap bitmap = PhotoUtils.getBitmapFromUri(uri2, this);
if (bitmap != null) {
image.setImageBitmap(bitmap);
}
break;
default:
}
}
}
//保存照片到指定的文件夹
/** 保存方法:保存文件耗时，在子线程中操作 */
public void saveBitmap( Bitmap bm ) { Log.e(TAG, "保存图片"); // 直接存在Environment.getExternalStorageDirectory()下，能够找到图片，加上后面的目录就没图片了 mSdCardDir = Environment.getExternalStorageDirectory()+ "/data/local/"; Log.e(TAG, "当前保存的路径是 ：" + mSdCardDir); File dirFile = new File(mSdCardDir); if (!dirFile .exists()) { //如果不存在，那就建立这个文件夹 dirFile .mkdirs(); } File newfile = new File(dirFile,new SimpleDateFormat("yyyyMMdd-HHmmss", Locale.CHINA).format(new Date())+".jpg"); mSaveContentUri = FileProvider.getUriForFile(this, "com.zzz.fileproviders", new File(mSdCardDir)); try { FileOutputStream out = new FileOutputStream(newfile); bm.compress(Bitmap.CompressFormat.PNG, 90, out); out.flush(); out.close(); Log.i(TAG, "已经保存"); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }
/**
* 检查设备是否存在SDCard的工具方法
*/
public static boolean hasSdcard() {
String state = Environment.getExternalStorageState();
return state.equals(Environment.MEDIA_MOUNTED);
}
}3.注意在7.0之后用FileProvider来操作相机
（1）新建一个res下xml文件夹，再建立file_path文件
<?xml version="1.0" encoding="utf-8"?>
<resources>
<paths>
<external-path
name="camerasss_photos"
path="" />
</paths>
</resources>（2）在清单文件下申明
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.zzz.fileproviders"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>相关的权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
tools:ignore="ProtectedPermissions" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />4.用到的相关的工具类
PhotoUtils:（工具类是在网上看别人的）
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
/**
* @author zhengzhong on 2016/8/6 16:16
* Email zheng_zhong@163.com
*/
public class PhotoUtils {
private static final String TAG = "PhotoUtils";
/**
* @param activity 当前activity
* @param imageUri 拍照后照片存储路径
* @param requestCode 调用系统相机请求码
*/
public static void takePicture(Activity activity, Uri imageUri, int requestCode) {
//调用系统相机
Intent intentCamera = new Intent();
intentCamera.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
//将拍照结果保存至photo_file的Uri中，不保留在相册中
intentCamera.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
activity.startActivityForResult(intentCamera, requestCode);
}
/**
* @param activity 当前activity
* @param requestCode 打开相册的请求码
*/
public static void openPic(Activity activity, int requestCode) {
Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT);
photoPickerIntent.setType("image/*");
activity.startActivityForResult(photoPickerIntent, requestCode);
}
/**
* @param activity 当前activity
* @param orgUri 剪裁原图的Uri
* @param desUri 剪裁后的图片的Uri
* @param aspectX X方向的比例
* @param aspectY Y方向的比例
* @param width 剪裁图片的宽度
* @param height 剪裁图片高度
* @param requestCode 剪裁图片的请求码
*/
public static void cropImageUri(Activity activity, Uri orgUri, Uri desUri, int aspectX, int aspectY, int width, int height, int requestCode) {
Intent intent = new Intent("com.android.camera.action.CROP");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
}
intent.setDataAndType(orgUri, "image/*");
//发送裁剪信号
intent.putExtra("crop", "true");
intent.putExtra("aspectX", aspectX);
intent.putExtra("aspectY", aspectY);
intent.putExtra("outputX", width);
intent.putExtra("outputY", height);
intent.putExtra("scale", true);
//将剪切的图片保存到目标Uri中
intent.putExtra(MediaStore.EXTRA_OUTPUT, desUri);
//1-false用uri返回图片
//2-true直接用bitmap返回图片（此种只适用于小图片，返回图片过大会报错）
intent.putExtra("return-data", false);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true);
activity.startActivityForResult(intent, requestCode);
}
/**
* 读取uri所在的图片
*
* @param uri 图片对应的Uri
* @param mContext 上下文对象
* @return 获取图像的Bitmap
*/
public static Bitmap getBitmapFromUri(Uri uri, Context mContext) {
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(mContext.getContentResolver(), uri);
return bitmap;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* @param context 上下文对象
* @param uri 当前相册照片的Uri
* @return 解析后的Uri对应的String
*/
@SuppressLint("NewApi")
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
String pathHead = "file:///";
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return pathHead + Environment.getExternalStorageDirectory() + "/" + split[1];
}
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return pathHead + getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[]{split[1]};
return pathHead + getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
return pathHead + getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return pathHead + uri.getPath();
}
return null;
}
/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
final int column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
private static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
private static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
private static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
}吐司的工具类：ToastUtils
public class ToastUtils
{
private ViewGroup.LayoutParams layoutParams;
private ToastUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
public static boolean isShow = true;
/**
* 短时间显示Toast
*
* @param context
* @param message
*/
public static void showShort(Context context, CharSequence message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
/**
* 短时间显示Toast
*
* @param context
* @param message
*/
public static void showShort(Context context, int message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
/**
* 长时间显示Toast
*
* @param context
* @param message
*/
public static void showLong(Context context, CharSequence message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
/**
* 长时间显示Toast
*
* @param context
* @param message
*/
public static void showLong(Context context, int message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
/**
* 自定义显示Toast时间
*
* @param context
* @param message
* @param duration
*/
public static void show(Context context, CharSequence message, int duration)
{
if (isShow)
Toast.makeText(context, message, duration).show();
}
/**
* 自定义显示Toast时间
*
* @param context
* @param message
* @param duration
*/
public static void show(Context context, int message, int duration)
{
if (isShow)
Toast.makeText(context, message, duration).show();
}//本人在vivo x9亲自测过，文件夹对应保存了相机拍照的照片，方便统一管理
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