質問編集履歴
2
変更
test
CHANGED
File without changes
|
test
CHANGED
@@ -223,3 +223,239 @@
|
|
223
223
|
read_fileのボタンを押すとread file error!!が帰ってくるのですが
|
224
224
|
|
225
225
|
file.txtは入力した時に作成されるのではなく、あらかじめ用意するものなのでしょうか?そしてこのファイルがどこに保存されるのかを教えていただきたいです。
|
226
|
+
|
227
|
+
|
228
|
+
|
229
|
+
|
230
|
+
|
231
|
+
|
232
|
+
|
233
|
+
#これでできました
|
234
|
+
|
235
|
+
```java
|
236
|
+
|
237
|
+
|
238
|
+
|
239
|
+
package com.example.ueday.write;
|
240
|
+
|
241
|
+
|
242
|
+
|
243
|
+
import android.app.Activity;
|
244
|
+
|
245
|
+
import android.os.Bundle;
|
246
|
+
|
247
|
+
import android.view.View;
|
248
|
+
|
249
|
+
import android.widget.Button;
|
250
|
+
|
251
|
+
import android.widget.EditText;
|
252
|
+
|
253
|
+
import android.widget.TextView;
|
254
|
+
|
255
|
+
import java.io.BufferedReader;
|
256
|
+
|
257
|
+
import java.io.BufferedWriter;
|
258
|
+
|
259
|
+
import java.io.File;
|
260
|
+
|
261
|
+
import java.io.FileInputStream;
|
262
|
+
|
263
|
+
import java.io.FileNotFoundException;
|
264
|
+
|
265
|
+
import java.io.FileOutputStream;
|
266
|
+
|
267
|
+
import java.io.IOException;
|
268
|
+
|
269
|
+
import java.io.InputStreamReader;
|
270
|
+
|
271
|
+
import java.io.OutputStreamWriter;
|
272
|
+
|
273
|
+
|
274
|
+
|
275
|
+
|
276
|
+
|
277
|
+
public class MainActivity extends Activity {
|
278
|
+
|
279
|
+
private TextView textView;
|
280
|
+
|
281
|
+
private EditText editText;
|
282
|
+
|
283
|
+
private String fileName = "file.txt";
|
284
|
+
|
285
|
+
|
286
|
+
|
287
|
+
|
288
|
+
|
289
|
+
@Override
|
290
|
+
|
291
|
+
protected void onCreate(Bundle savedInstanceState) {
|
292
|
+
|
293
|
+
super.onCreate(savedInstanceState);
|
294
|
+
|
295
|
+
setContentView(R.layout.activity_main);
|
296
|
+
|
297
|
+
|
298
|
+
|
299
|
+
textView = findViewById(R.id.text_view);
|
300
|
+
|
301
|
+
|
302
|
+
|
303
|
+
editText = findViewById(R.id.edit_text);
|
304
|
+
|
305
|
+
|
306
|
+
|
307
|
+
|
308
|
+
|
309
|
+
createFile();
|
310
|
+
|
311
|
+
|
312
|
+
|
313
|
+
|
314
|
+
|
315
|
+
Button buttonSave = findViewById(R.id.button_save);
|
316
|
+
|
317
|
+
buttonSave.setOnClickListener(new View.OnClickListener() {
|
318
|
+
|
319
|
+
@Override
|
320
|
+
|
321
|
+
public void onClick(View v) {
|
322
|
+
|
323
|
+
String text = editText.getText().toString();
|
324
|
+
|
325
|
+
saveFile(fileName, text);
|
326
|
+
|
327
|
+
if (text.length() == 0) {
|
328
|
+
|
329
|
+
textView.setText(R.string.no_text);
|
330
|
+
|
331
|
+
} else {
|
332
|
+
|
333
|
+
textView.setText(R.string.saved);
|
334
|
+
|
335
|
+
}
|
336
|
+
|
337
|
+
}
|
338
|
+
|
339
|
+
});
|
340
|
+
|
341
|
+
|
342
|
+
|
343
|
+
Button buttonRead = findViewById(R.id.button_read);
|
344
|
+
|
345
|
+
buttonRead.setOnClickListener(new View.OnClickListener() {
|
346
|
+
|
347
|
+
@Override
|
348
|
+
|
349
|
+
public void onClick(View v) {
|
350
|
+
|
351
|
+
String str = readFile(fileName);
|
352
|
+
|
353
|
+
if (str != null) {
|
354
|
+
|
355
|
+
textView.setText(str);
|
356
|
+
|
357
|
+
} else {
|
358
|
+
|
359
|
+
textView.setText(R.string.read_error);
|
360
|
+
|
361
|
+
}
|
362
|
+
|
363
|
+
}
|
364
|
+
|
365
|
+
});
|
366
|
+
|
367
|
+
}
|
368
|
+
|
369
|
+
|
370
|
+
|
371
|
+
|
372
|
+
|
373
|
+
|
374
|
+
|
375
|
+
public void createFile() {
|
376
|
+
|
377
|
+
File file = new File(getFilesDir() + "/" + fileName);
|
378
|
+
|
379
|
+
if(!file.exists()){
|
380
|
+
|
381
|
+
try {
|
382
|
+
|
383
|
+
file.createNewFile();
|
384
|
+
|
385
|
+
} catch (IOException e) {
|
386
|
+
|
387
|
+
}
|
388
|
+
|
389
|
+
}
|
390
|
+
|
391
|
+
}
|
392
|
+
|
393
|
+
|
394
|
+
|
395
|
+
|
396
|
+
|
397
|
+
public void saveFile(String file, String str) {
|
398
|
+
|
399
|
+
try {
|
400
|
+
|
401
|
+
FileOutputStream fos = openFileOutput(file, MODE_PRIVATE);
|
402
|
+
|
403
|
+
OutputStreamWriter osw = new OutputStreamWriter(fos);
|
404
|
+
|
405
|
+
BufferedWriter writer = new BufferedWriter(osw);
|
406
|
+
|
407
|
+
writer.write(str);
|
408
|
+
|
409
|
+
writer.close();
|
410
|
+
|
411
|
+
} catch (IOException e) {
|
412
|
+
|
413
|
+
e.printStackTrace();
|
414
|
+
|
415
|
+
}
|
416
|
+
|
417
|
+
}
|
418
|
+
|
419
|
+
|
420
|
+
|
421
|
+
public String readFile(String file) {
|
422
|
+
|
423
|
+
String text = null;
|
424
|
+
|
425
|
+
try {
|
426
|
+
|
427
|
+
FileInputStream fileInputStream = openFileInput(file);
|
428
|
+
|
429
|
+
BufferedReader reader = new BufferedReader(
|
430
|
+
|
431
|
+
new InputStreamReader(fileInputStream, "UTF-8"));
|
432
|
+
|
433
|
+
String lineBuffer;
|
434
|
+
|
435
|
+
while( (lineBuffer = reader.readLine()) != null ) {
|
436
|
+
|
437
|
+
text = lineBuffer ;
|
438
|
+
|
439
|
+
}
|
440
|
+
|
441
|
+
|
442
|
+
|
443
|
+
} catch (IOException e) {
|
444
|
+
|
445
|
+
e.printStackTrace();
|
446
|
+
|
447
|
+
}
|
448
|
+
|
449
|
+
|
450
|
+
|
451
|
+
return text;
|
452
|
+
|
453
|
+
}
|
454
|
+
|
455
|
+
|
456
|
+
|
457
|
+
|
458
|
+
|
459
|
+
}
|
460
|
+
|
461
|
+
```
|
1
変更
test
CHANGED
File without changes
|
test
CHANGED
@@ -20,14 +20,22 @@
|
|
20
20
|
|
21
21
|
import java.io.BufferedReader;
|
22
22
|
|
23
|
+
import java.io.BufferedWriter;
|
24
|
+
|
25
|
+
import java.io.File;
|
26
|
+
|
23
27
|
import java.io.FileInputStream;
|
24
28
|
|
29
|
+
import java.io.FileNotFoundException;
|
30
|
+
|
25
31
|
import java.io.FileOutputStream;
|
26
32
|
|
27
33
|
import java.io.IOException;
|
28
34
|
|
29
35
|
import java.io.InputStreamReader;
|
30
36
|
|
37
|
+
import java.io.OutputStreamWriter;
|
38
|
+
|
31
39
|
|
32
40
|
|
33
41
|
|
@@ -42,6 +50,8 @@
|
|
42
50
|
|
43
51
|
|
44
52
|
|
53
|
+
|
54
|
+
|
45
55
|
@Override
|
46
56
|
|
47
57
|
protected void onCreate(Bundle savedInstanceState) {
|
@@ -60,10 +70,16 @@
|
|
60
70
|
|
61
71
|
|
62
72
|
|
73
|
+
|
74
|
+
|
75
|
+
createFile();
|
76
|
+
|
77
|
+
|
78
|
+
|
79
|
+
|
80
|
+
|
63
81
|
Button buttonSave = findViewById(R.id.button_save);
|
64
82
|
|
65
|
-
|
66
|
-
|
67
83
|
buttonSave.setOnClickListener(new View.OnClickListener() {
|
68
84
|
|
69
85
|
@Override
|
@@ -120,15 +136,43 @@
|
|
120
136
|
|
121
137
|
|
122
138
|
|
139
|
+
|
140
|
+
|
141
|
+
public void createFile() {
|
142
|
+
|
143
|
+
File file = new File(getFilesDir() + "/" + fileName);
|
144
|
+
|
145
|
+
if(!file.exists()){
|
146
|
+
|
147
|
+
try {
|
148
|
+
|
149
|
+
file.createNewFile();
|
150
|
+
|
151
|
+
} catch (IOException e) {
|
152
|
+
|
153
|
+
}
|
154
|
+
|
155
|
+
}
|
156
|
+
|
157
|
+
}
|
158
|
+
|
159
|
+
|
160
|
+
|
161
|
+
|
162
|
+
|
123
163
|
public void saveFile(String file, String str) {
|
124
164
|
|
125
165
|
try {
|
126
166
|
|
127
|
-
FileOutputStream f
|
167
|
+
FileOutputStream fos = openFileOutput(file, MODE_PRIVATE);
|
128
|
-
|
129
|
-
|
130
|
-
|
168
|
+
|
131
|
-
|
169
|
+
OutputStreamWriter osw = new OutputStreamWriter(fos);
|
170
|
+
|
171
|
+
BufferedWriter writer = new BufferedWriter(osw);
|
172
|
+
|
173
|
+
writer.write(str);
|
174
|
+
|
175
|
+
writer.close();
|
132
176
|
|
133
177
|
} catch (IOException e) {
|
134
178
|
|