android 系统4.4调用本地图库和系统相机

设置拍照和访问外置存储的权限

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"          package="com.test3">    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>    <uses-permission android:name="android.permission.CAMERA"/>    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/APPTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN"/>                <category android:name="android.intent.category.LAUNCHER"/>            </intent-filter>        </activity>    </application></manifest>
判断存储的Util类
public class FileUtils {	//图片所在路径    PRivate static String filePath="";	//返回图片觉得路径    public static String getPath(String fileName){        if(!isStorage()){            return "";        }        filePath=Environment.getExternalStorageDirectory().getAbsolutePath()+File.separator+fileName;        File file=new File(filePath);        if(!file.exists()){            file.mkdir();        }        return filePath;    }	//判断外置内存状态    public static boolean isStorage(){        return Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);    }}
MainActivity完整代码
public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private Button btn_photo,btn_local;    private ImageView image_look;    //图片名字    private String fileName="";    //图片所在文件夹名    private String fileName2="Test";    private int CALLCAMARE=1;    private int LOCALIMAGE=2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        findView();    }    private void findView() {        btn_local= (Button) findViewById(R.id.btn_local);        btn_photo= (Button) findViewById(R.id.btn_photo);        image_look= (ImageView) findViewById(R.id.imag_look);        btn_photo.setOnClickListener(this);        btn_local.setOnClickListener(this);    }    @Override    public void onClick(View v) {       if(v.getId()==btn_photo.getId()){           fileName=FileUtils.getPath(fileName2);           if(fileName.length()==0){               Toast.makeText(this,"外置内存不存在，不能拍照",Toast.LENGTH_SHORT).show();           }else{               Intent intent = new Intent();               intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);               intent.addCategory(Intent.CATEGORY_DEFAULT);               startActivityForResult(intent, CALLCAMARE);           }       }       if(v.getId()==btn_local.getId()){           Intent intent = new Intent();           intent.setType("image/*");// 从所有图片中进行选择            //根据版本号不同使用不同的Action           if (Build.VERSION.SDK_INT <19) {               intent.setAction(Intent.ACTION_GET_CONTENT);           }else {               intent.setAction(Intent.ACTION_OPEN_DOCUMENT);           }           startActivityForResult(intent,LOCALIMAGE);       }    }    public String getFileNmae(){        SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd_hhmmss");        return sdf.format(new Date());    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if(requestCode==CALLCAMARE&&resultCode==RESULT_OK){            if(data!=null){                showImage(data);            }        }        if(requestCode==LOCALIMAGE&&resultCode==RESULT_OK){            if (null!=data) {                Uri uri = data.getData();                InputStream inputStream = null;                try {
		   //在网上找的简单获取4.4以上和4.4以下版本uri                    inputStream = getContentResolver().openInputStream(uri);                } catch (FileNotFoundException e) {                    e.printStackTrace();                }                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);                image_look.setImageBitmap(bitmap);            }        }        super.onActivityResult(requestCode, resultCode, data);    }    private void showImage(Intent data) {        {            FileOutputStream fo=null;            try{                Bundle bund=data.getExtras();                Bitmap bmp= (Bitmap) bund.get("data");                fileName=fileName+File.separator+getFileNmae()+".jpg";                File file=new File(fileName);                fo=new FileOutputStream(file);                bmp.compress(Bitmap.CompressFormat.JPEG,70,fo);                image_look.setImageBitmap(bmp);            }catch (Exception e){                Toast.makeText(this,e.getMessage(),Toast.LENGTH_SHORT).show();            }finally {                try{                    fo.flush();                    fo.close();                }catch (Exception e){                }            }        }    }}
4.4及以上版本根据uri获取图片路径
public static String getPath(final Context context, final Uri uri) {		final boolean isKitKat = Build.VERSION.SDK_INT >= 19;		// 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 Environment.getExternalStorageDirectory() + "/"							+ split[1];				}				// TODO handle non-primary volumes			}			// 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 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 getDataColumn(context, contentUri, selection,						selectionArgs);			}		}		// MediaStore (and general)		else if ("content".equalsIgnoreCase(uri.getScheme())) {			// Return the remote address			if (isGooglePhotosUri(uri))				return uri.getLastPathSegment();			return getDataColumn(context, uri, null, null);		}		// File		else if ("file".equalsIgnoreCase(uri.getScheme())) {			return uri.getPath();		} else {		}		return null;	}
       public static boolean isExternalStorageDocument(Uri uri) {		return "com.android.externalstorage.documents".equals(uri				.getAuthority());	}	public static boolean isDownloadsDocument(Uri uri) {		return "com.android.providers.downloads.documents".equals(uri				.getAuthority());	}	public static boolean isMediaDocument(Uri uri) {		return "com.android.providers.media.documents".equals(uri				.getAuthority());	}	public static boolean isGooglePhotosUri(Uri uri) {		return "com.google.android.apps.photos.content".equals(uri				.getAuthority());	}
4.4以下根据uri获取图片路径
public 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 index = cursor.getColumnIndexOrThrow(column);				return cursor.getString(index);			}		} finally {			if (cursor != null)				cursor.close();		}		return null;	}