teratail
回答率
85.35%
teratail header banner
teratail header banner
質問するログイン新規登録
トップJavaに関する質問ギャラリーから読み込んだ画像を、アプリの画面に保存させたい

編集履歴

回答編集履歴

1

あいういえお

2020/09/14 14:46

投稿

退会済みユーザー
test CHANGED
@@ -3,3 +3,249 @@
3
3
 
4
4
 
5
5
  画面再起動時は保存した文字列を読み込んでUriに戻しBitmapを表示してはどうですか？
6
+
7
+
8
+
9
+ ```java
10
+
11
+ public class MainActivity extends AppCompatActivity {
12
+
13
+ private static final int RESULT_PICK_IMAGEFILE = 1001;
14
+
15
+ private static final String KEY = "key";
16
+
17
+ private ImageView imageView;
18
+
19
+ private String url = null;
20
+
21
+
22
+
23
+ @Override
24
+
25
+ protected void onCreate(Bundle savedInstanceState) {
26
+
27
+ super.onCreate(savedInstanceState);
28
+
29
+ setContentView(R.layout.activity_main);
30
+
31
+ imageView = findViewById(R.id.imageEdit);
32
+
33
+ SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
34
+
35
+ String lastUrl = sp.getString(KEY, null);
36
+
37
+ if(lastUrl != null) {
38
+
39
+ loadImage(Uri.parse(lastUrl));
40
+
41
+ }
42
+
43
+ findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
44
+
45
+ public void onClick(View v) {
46
+
47
+ Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
48
+
49
+ intent.addCategory(Intent.CATEGORY_OPENABLE);
50
+
51
+ intent.setType("*/*");
52
+
53
+ startActivityForResult(intent, RESULT_PICK_IMAGEFILE);
54
+
55
+ }
56
+
57
+ });
58
+
59
+
60
+
61
+ findViewById(R.id.save).setOnClickListener(new View.OnClickListener() {
62
+
63
+ public void onClick(View v) {
64
+
65
+ if(url != null) {
66
+
67
+ sp.edit().putString(KEY,url).apply();
68
+
69
+ }
70
+
71
+ }
72
+
73
+ });
74
+
75
+ }
76
+
77
+
78
+
79
+ @RequiresApi(api = Build.VERSION_CODES.KITKAT)
80
+
81
+ @Override
82
+
83
+ public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
84
+
85
+ super.onActivityResult(requestCode, resultCode, resultData);
86
+
87
+ if (requestCode == RESULT_PICK_IMAGEFILE && resultCode == Activity.RESULT_OK && resultData.getData() != null) {
88
+
89
+ Uri uri = resultData.getData();
90
+
91
+ final int takeFlags = resultData.getFlags()
92
+
93
+ & (Intent.FLAG_GRANT_READ_URI_PERMISSION
94
+
95
+ | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
96
+
97
+ try {
98
+
99
+ getContentResolver().takePersistableUriPermission(uri, takeFlags);
100
+
101
+ }
102
+
103
+ catch (SecurityException e){
104
+
105
+ e.printStackTrace();
106
+
107
+ }
108
+
109
+ url = uri.toString();
110
+
111
+ loadImage(uri);
112
+
113
+ }
114
+
115
+ }
116
+
117
+
118
+
119
+ private void loadImage(Uri uri) {
120
+
121
+ ParcelFileDescriptor pfDescriptor = null;
122
+
123
+ try {
124
+
125
+ pfDescriptor = getContentResolver().openFileDescriptor(uri, "r");
126
+
127
+ if (pfDescriptor != null) {
128
+
129
+ FileDescriptor fileDescriptor = pfDescriptor.getFileDescriptor();
130
+
131
+ Bitmap bmp = BitmapFactory.decodeFileDescriptor(fileDescriptor);
132
+
133
+ pfDescriptor.close();
134
+
135
+ imageView.setImageBitmap(bmp);
136
+
137
+ }
138
+
139
+ } catch (IOException e) {
140
+
141
+ e.printStackTrace();
142
+
143
+ } finally {
144
+
145
+ try {
146
+
147
+ if (pfDescriptor != null) {
148
+
149
+ pfDescriptor.close();
150
+
151
+ }
152
+
153
+ } catch (Exception e) {
154
+
155
+ e.printStackTrace();
156
+
157
+ }
158
+
159
+ }
160
+
161
+ }
162
+
163
+ }
164
+
165
+ ```
166
+
167
+
168
+
169
+ ```xml
170
+
171
+ <?xml version="1.0" encoding="utf-8"?>
172
+
173
+ <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
174
+
175
+ xmlns:app="http://schemas.android.com/apk/res-auto"
176
+
177
+ xmlns:tools="http://schemas.android.com/tools"
178
+
179
+ android:layout_width="match_parent"
180
+
181
+ android:layout_height="match_parent"
182
+
183
+ tools:context=".MainActivity">
184
+
185
+
186
+
187
+ <ImageView
188
+
189
+ android:id="@+id/imageEdit"
190
+
191
+ android:layout_width="match_parent"
192
+
193
+ android:layout_height="300dp"
194
+
195
+ app:layout_constraintBottom_toBottomOf="parent"
196
+
197
+ app:layout_constraintEnd_toEndOf="parent"
198
+
199
+ app:layout_constraintHorizontal_bias="0.498"
200
+
201
+ app:layout_constraintStart_toStartOf="parent"
202
+
203
+ app:layout_constraintTop_toTopOf="parent"
204
+
205
+ app:layout_constraintVertical_bias="0.476" />
206
+
207
+
208
+
209
+ <Button
210
+
211
+ android:id="@+id/button"
212
+
213
+ android:layout_width="wrap_content"
214
+
215
+ android:layout_height="wrap_content"
216
+
217
+ android:text="load"
218
+
219
+ app:layout_constraintBottom_toBottomOf="@id/save"
220
+
221
+ app:layout_constraintEnd_toEndOf="parent"
222
+
223
+ app:layout_constraintStart_toStartOf="parent"
224
+
225
+ app:layout_constraintTop_toBottomOf="@+id/imageEdit" />
226
+
227
+
228
+
229
+ <Button
230
+
231
+ android:id="@+id/save"
232
+
233
+ android:layout_width="wrap_content"
234
+
235
+ android:layout_height="wrap_content"
236
+
237
+ android:text="save"
238
+
239
+ app:layout_constraintBottom_toBottomOf="parent"
240
+
241
+ app:layout_constraintEnd_toEndOf="parent"
242
+
243
+ app:layout_constraintStart_toStartOf="parent"
244
+
245
+ app:layout_constraintTop_toBottomOf="@+id/button" />
246
+
247
+
248
+
249
+ </androidx.constraintlayout.widget.ConstraintLayout>
250
+
251
+ ```