Android 相册选择照片或拍照获取图片系统6.0及7.0实现

6.0及6.0以上权限动态询问

private static final int MY_PERMISSIONS_REQUEST_CALL_PHONE = 6;
private static final int MY_PERMISSIONS_REQUEST_CALL_PHONE2 = 7;

//手机拍照
camera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (ContextCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(ReviewActivity.this,
new String[]{Manifest.permission.CAMERA},
MY_PERMISSIONS_REQUEST_CALL_PHONE);
} else {
photo();
dialog.dismiss();
}
}
});

//从相册选择图片
photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (ContextCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(ReviewActivity.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_CALL_PHONE2);

} else {
int selectedMode;
selectedMode = MultiImageSelectorActivity.MODE_MULTI;
int maxNum = 9 - drr.size();
Intent intent = new Intent(ReviewActivity.this,                             MultiImageSelectorActivity.class);
// 是否显示拍摄图片
intent.putExtra(MultiImageSelectorActivity.EXTRA_SHOW_CAMERA, false);
// 最大可选择图片数量
intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_COUNT, maxNum);
// 选择模式
intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_MODE, selectedMode);

startActivityForResult(intent, RESULT_LOAD_IMAGE);
dialog.dismiss();
}

}
});

/**
* 拍照方法代码
*/
public void photo() {
try {
if (hasSdcard()) {
String sdcardState = Environment.getExternalStorageState();
String sdcardPathDir = Environment.getExternalStorageDirectory().getPath() + "/tempImage/";
File file = null;

if (Environment.MEDIA_MOUNTED.equals(sdcardState)) {
// 有sd卡，是否有myImage文件夹
File fileDir = new File(sdcardPathDir);
if (!fileDir.exists()) {
fileDir.mkdirs();
}
// 是否有headImg文件
file = new File(sdcardPathDir + System.currentTimeMillis() + ".JPEG");
}
if (file != null) {
path = file.getPath();
photoUri = Uri.fromFile(file);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
//通过FileProvider创建一个content类型的Uri
photoUri = FileProvider.getUriForFile(ReviewActivity.this, "com.zuihou.drunkenmonkey.fileprovider", file);
}
Intent openCameraIntent = new Intent();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
openCameraIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); //添加这一句表示对目标应用临时授权该Uri所代表的文件
}
openCameraIntent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
openCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
startActivityForResult(openCameraIntent, TAKE_PICTURE);
}
} else {
ToastUtil.showToast(getApplicationContext(), "设备没有SD卡！");
}
} catch (Exception e) {
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);
}

这里有一句代码：

FileProvider.getUriForFile(ReviewActivity.this, "com.zuihou.drunkenmonkey.fileprovider", file);

在用Android 7.0版本时，调用相机拍照出现了异常 FileUriExposedException，就是在传递uri时出错 Android 7.0后又修改了文件权限，可以使用FileProvider解决

在项目res目录下创建xml文件夹

<?xml version="1.0" encoding="utf-8"?>
<paths>
<!--        xml文件是唯一设置分享的目录 ，不能用代码设置

1.<files-path>        getFilesDir()  /data/data//files目录
2.<cache-path>        getCacheDir()  /data/data//cache目录

3.<external-path>     Environment.getExternalStorageDirectory()

SDCard/Android/data/你的应用的包名/files/ 目录
4.<external-files-path>     Context#getExternalFilesDir(String) Context.getExternalFilesDir(null).
5.<external-cache-path>      Context.getExternalCacheDir().
-->

<!--    path :代表设置的目录下一级目录 eg：<external-path path="images/"
整个目录为Environment.getExternalStorageDirectory()+"/images/"
name: 代表定义在Content中的字段 eg：name = "myimages" ，并且请求的内容的文件名为default_image.jpg
则 返回一个URI   content://com.example.myapp.fileprovider/myimages/default_image.jpg
-->

<!--当path 为空时 5个全配置就可以解决-->

<external-path
name="camera_photos"
path="" />
</paths>

在manifest.xml文件添加provider，相机，读写文件权限

<provider
android:name="android.support.v4.content.FileProvider"   //固定值
android:authorities="com.zuihou.drunkenmonkey.fileprovider"  //前面为项目的包名，fileprovider固定
android:exported="false" //是否支持其它应用调用当前组件 ，要求为flase
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS" //固定值
android:resource="@xml/file_paths" /> //在res目录下定义的filepaths.xml文件，名字可以自定义
</provider>

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

获取权限后返回结果代码

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == MY_PERMISSIONS_REQUEST_CALL_PHONE) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
photo();
} else {
// Permission Denied
ToastUtil.showToast(ReviewActivity.this, "Permission Denied");
}
}

if (requestCode == MY_PERMISSIONS_REQUEST_CALL_PHONE2) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
int selectedMode;
selectedMode = MultiImageSelectorActivity.MODE_MULTI;
int maxNum = 9 - drr.size();
Intent intent = new Intent(ReviewActivity.this, MultiImageSelectorActivity.class);
// 是否显示拍摄图片
intent.putExtra(MultiImageSelectorActivity.EXTRA_SHOW_CAMERA, false);
// 最大可选择图片数量
intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_COUNT, maxNum);
// 选择模式
intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_MODE, selectedMode);

startActivityForResult(intent, RESULT_LOAD_IMAGE);

dialog.dismiss();
} else {
// Permission Denied
ToastUtil.showToast(ReviewActivity.this, "Permission Denied");
}
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}