一、前言
引用《第一行代碼》8.3調(diào)用攝像頭和相冊
二殉挽、調(diào)用攝像頭
1丰涉、Android7.0之后加入了provider拓巧,首先Android Studio中添加provider的相關(guān)代碼。
- 在AndroidManifest注冊provider
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".TakeAPhoto">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.example.administrator.drawable.fileprovider"http://自己的包名.fileprovider
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
</application>
- 創(chuàng)建file_paths.xml文件:res-->xml(新建)-->file.paths(新建)一死。
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="my_images" path="" />
</paths>
注:空值就表示將整個SD卡進(jìn)行共享肛度,當(dāng)然也可以僅共享我們存放output_image.jpg這張圖片的路徑。
2投慈、相機(jī)拍照需要獲取寫入內(nèi)存的權(quán)限贤斜,在AndroidManifest中添加權(quán)限。在調(diào)用相機(jī)時詢問并獲取權(quán)限逛裤。
- 添加權(quán)限
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.cameraalbumtest">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
...
</manifest>
- 詢問并獲取權(quán)限
if (ContextCompat.checkSelfPermission(TakeAPhoto.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(TakeAPhoto.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
} else {
takePhoto();
}
- 重寫獲取權(quán)限的結(jié)果,進(jìn)行相關(guān)操作
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.
PERMISSION_GRANTED) {
//需要進(jìn)行的操作
} else {
Toast.makeText(TakeAPhoto.this, "您取消了申請權(quán)限", Toast.LENGTH_LONG).show();
}
}
}
- 附上有關(guān)權(quán)限的相關(guān)文章
重新認(rèn)識Android權(quán)限
3猴抹、調(diào)用相機(jī)的相關(guān)代碼带族。
public class TakeAPhoto extends AppCompatActivity {
public static final int TAKE_PHOTO = 1;
private ImageView picture;
private Uri imageUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.take_a_photo);
final Button takePhoto = (Button) findViewById(R.id.take_photo);
picture = (ImageView) findViewById(R.id.picture);
takePhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 獲取權(quán)限
if (ContextCompat.checkSelfPermission(TakeAPhoto.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(TakeAPhoto.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
} else {
takePhoto();
}
}
});
}
private void takePhoto() {
// 創(chuàng)建File對象,用于存儲拍照后的圖片蟀给◎觯可根據(jù)自己需求創(chuàng)建對應(yīng)的文件夾
File outputImage = new File(getExternalCacheDir(),
"output_image.jpg");//這里可以用當(dāng)前時間戳來命名。 System.currentTimeMillis() + ".jpg" ;
try {
if (outputImage.exists()) {
outputImage.delete();
}
outputImage.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
if (Build.VERSION.SDK_INT >= 24) {
imageUri = FileProvider.getUriForFile(TakeAPhoto.this,
"com.example.administrator.drawable.fileprovider", outputImage);
} else {
imageUri = Uri.fromFile(outputImage);
}
// 啟動相機(jī)程序
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, TAKE_PHOTO);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case TAKE_PHOTO:
if (resultCode == RESULT_OK) {
try {
// 將拍攝的照片顯示出來
Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
picture.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
break;
default:
break;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.
PERMISSION_GRANTED) {
takePhoto();
} else {
Toast.makeText(TakeAPhoto.this, "您取消了申請權(quán)限", Toast.LENGTH_LONG).show();
}
}
}
}
打開相機(jī)思路:添加Provider跋理,添加權(quán)限择克,調(diào)用相機(jī)打開拍照,打開前判斷手機(jī)版本是否高于23(7.0)前普,獲取對應(yīng)的Uri肚邢。在進(jìn)行操作,在重寫的返回結(jié)果中顯示圖片
三拭卿、打開相冊
1骡湖、獲取權(quán)限(AndroidManifest中申明,在打開相冊前詢問并授權(quán))峻厚,同上
2响蕴、打開相冊相關(guān)代碼
public class TakeAPhoto extends AppCompatActivity {
public static final int TAKE_PHOTO = 1;
public static final int CHOOSE_PHOTO = 2;
private ImageView picture;
private Uri imageUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.take_a_photo);
.....
Button chooseFromAlbum = (Button) findViewById(R.id.choose_from_album);
.....
chooseFromAlbum.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (ContextCompat.checkSelfPermission(TakeAPhoto.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.
PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(TakeAPhoto.this, new
String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
} else {
openAlbum();
}
}
});
}
private void openAlbum() {
Intent intent = new Intent("android.intent.action.GET_CONTENT");
intent.setType("image/*");
startActivityForResult(intent, CHOOSE_PHOTO); // 打開相冊
}
..........
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case TAKE_PHOTO:
if (resultCode == RESULT_OK) {
try {
// 將拍攝的照片顯示出來
Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
picture.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
break;
case CHOOSE_PHOTO:
if (requestCode == RESULT_OK) {
// 判斷手機(jī)系統(tǒng)版本號
if (Build.VERSION.SDK_INT >= 19) {
// 4.4及以上系統(tǒng)使用這個方法處理圖片
handleImageOnKitKat(data);
} else {
// 4.4以下系統(tǒng)使用這個方法處理圖片
handleImageBeforeKitKat(data);
}
}
break;
default:
break;
}
}
@TargetApi(19)
private void handleImageOnKitKat(Intent data) {
String imagePath = null;
Uri uri = data.getData();
if (DocumentsContract.isDocumentUri(this, uri)) {
// 如果是document類型的Uri,則通過document id處理
String docId = DocumentsContract.getDocumentId(uri);
if ("com.android.providers.media.documents".equals(uri.getAuthority())) {
String id = docId.split(":")[1]; // 解析出數(shù)字格式的id
String selection = MediaStore.Images.Media._ID + "=" + id;
imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);
} else if ("com.android.providers.downloads.documents".equals(uri.
getAuthority())) {
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(docId));
imagePath = getImagePath(contentUri, null);
}
} else if ("content".equalsIgnoreCase(uri.getScheme())) {
// 如果是content類型的Uri惠桃,則使用普通方式處理
imagePath = getImagePath(uri, null);
} else if ("file".equalsIgnoreCase(uri.getScheme())) {
// 如果是file類型的Uri浦夷,直接獲取圖片路徑即可
imagePath = uri.getPath();
}
displayImage(imagePath); // 根據(jù)圖片路徑顯示圖片
}
private void handleImageBeforeKitKat(Intent data) {
Uri uri = data.getData();
String imagePath = getImagePath(uri, null);
displayImage(imagePath);
}
private String getImagePath(Uri uri, String selection) {
String path = null;
// 通過Uri和selection來獲取真實(shí)的圖片路徑
Cursor cursor = getContentResolver().query(uri, null, selection, null, null);
if (cursor != null) {
if (cursor.moveToFirst()) {
path = cursor.getString(cursor.getColumnIndex(MediaStore.
Images.Media.DATA));
}
cursor.close();
}
return path;
}
private void displayImage(String imagePath) {
if (imagePath != null) {
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
picture.setImageBitmap(bitmap);
} else {
Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.
PERMISSION_GRANTED) {
// takePhoto();
openAlbum();
} else {
Toast.makeText(TakeAPhoto.this, "您取消了申請權(quán)限", Toast.LENGTH_LONG).show();
}
}
}
}
思路:先添加權(quán)限,通過Intent打開相冊選取照片辜王,選擇照片后判斷手機(jī)版本是否低于4.4劈狐,在重寫的返回結(jié)果中使用對應(yīng)的方法進(jìn)行操作(不用provider)。