APP
由于android 7.0新增了動態權限，所以我們在做拍照和相冊選取功能的時候，需要申請添加動態權限
實現效果圖：
（1）在res目錄下，新建xml文件夾 ，在xml文件夾中新建一個filepaths.xml
?
<?xml version="1.0" encoding="utf-8"?>
<resources>
<external-path
name="images"
path="test/"/>
</resources>（2）去清單文件里面添加權限 ?AndroidManifest.xml，拍照和選照片權限只加這一個即可，多加錯加均會導致程序報錯
?
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>?
（3）添加provider，注意provider紅色部分為當前項目包名，黑色部分為xml文件夾中filepaths文件名
?
<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>（4）主界面的布局 activity_main.xml
?
<?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="從相冊選取圖片"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/take_button"/>
</LinearLayout>（5）在MainActivity中動態申請權限，并且調用系統相機和相冊
?
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();
//改變Uri com.xykj.customview.fileprovider注意和xml中的一致
Uri uri = FileProvider.getUriForFile(this, "com.gjp.activity.teste.fileprovider", file);
//添加權限
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(intent, REQUEST_CAMERA);
}
private void getPhoto(){
//在這里跳轉到手機系統相冊里面
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]);
// 權限是否已經 授權 GRANTED---授權 DINIED---拒絕
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 {
// 沒有獲取 到權限，從新請求，或者關閉app
Toast.makeText(this, "需要存儲權限", 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()));
//在手機相冊中顯示剛拍攝的圖片
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(); //獲取系統返回的照片的Uri
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);//從系統表中查詢指定Uri對應的照片
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
paths = cursor.getString(columnIndex); //獲取照片路徑
cursor.close();
Bitmap bitmap = BitmapFactory.decodeFile(paths);
imageView.setImageBitmap(bitmap);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
?
本文摘自 ：https://blog.51cto.com/u
