回答編集履歴
1
あいういえお
answer
CHANGED
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@@ -1,3 +1,126 @@
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1
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saveボタンを押した時にonActivityResultで取得したUriをtoStringで文字列化して、SharedPrefrenceかSQLite等に保存してはどうでしょうか？
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2
2
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3
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-
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？
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3
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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？
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4
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5
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```java
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public class MainActivity extends AppCompatActivity {
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7
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private static final int RESULT_PICK_IMAGEFILE = 1001;
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8
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private static final String KEY = "key";
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9
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private ImageView imageView;
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10
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private String url = null;
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11
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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imageView = findViewById(R.id.imageEdit);
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SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
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String lastUrl = sp.getString(KEY, null);
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if(lastUrl != null) {
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loadImage(Uri.parse(lastUrl));
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}
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findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
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public void onClick(View v) {
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Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
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intent.addCategory(Intent.CATEGORY_OPENABLE);
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intent.setType("*/*");
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startActivityForResult(intent, RESULT_PICK_IMAGEFILE);
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}
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});
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findViewById(R.id.save).setOnClickListener(new View.OnClickListener() {
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public void onClick(View v) {
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if(url != null) {
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sp.edit().putString(KEY,url).apply();
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35
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}
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}
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});
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}
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40
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@RequiresApi(api = Build.VERSION_CODES.KITKAT)
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@Override
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public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
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super.onActivityResult(requestCode, resultCode, resultData);
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if (requestCode == RESULT_PICK_IMAGEFILE && resultCode == Activity.RESULT_OK && resultData.getData() != null) {
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Uri uri = resultData.getData();
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final int takeFlags = resultData.getFlags()
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& (Intent.FLAG_GRANT_READ_URI_PERMISSION
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| Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
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try {
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getContentResolver().takePersistableUriPermission(uri, takeFlags);
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}
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catch (SecurityException e){
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e.printStackTrace();
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}
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55
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url = uri.toString();
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56
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loadImage(uri);
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}
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}
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59
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60
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private void loadImage(Uri uri) {
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61
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ParcelFileDescriptor pfDescriptor = null;
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try {
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pfDescriptor = getContentResolver().openFileDescriptor(uri, "r");
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if (pfDescriptor != null) {
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FileDescriptor fileDescriptor = pfDescriptor.getFileDescriptor();
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Bitmap bmp = BitmapFactory.decodeFileDescriptor(fileDescriptor);
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pfDescriptor.close();
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imageView.setImageBitmap(bmp);
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}
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} catch (IOException e) {
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e.printStackTrace();
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} finally {
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try {
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if (pfDescriptor != null) {
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pfDescriptor.close();
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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80
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}
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81
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}
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82
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}
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83
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```
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84
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85
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```xml
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86
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<?xml version="1.0" encoding="utf-8"?>
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87
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<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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88
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xmlns:app="http://schemas.android.com/apk/res-auto"
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89
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xmlns:tools="http://schemas.android.com/tools"
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90
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android:layout_width="match_parent"
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91
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android:layout_height="match_parent"
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92
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tools:context=".MainActivity">
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93
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94
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<ImageView
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95
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android:id="@+id/imageEdit"
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96
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android:layout_width="match_parent"
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97
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android:layout_height="300dp"
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98
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app:layout_constraintBottom_toBottomOf="parent"
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99
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app:layout_constraintEnd_toEndOf="parent"
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100
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app:layout_constraintHorizontal_bias="0.498"
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101
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app:layout_constraintStart_toStartOf="parent"
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102
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app:layout_constraintTop_toTopOf="parent"
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103
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app:layout_constraintVertical_bias="0.476" />
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104
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105
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<Button
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106
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android:id="@+id/button"
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107
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android:layout_width="wrap_content"
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108
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android:layout_height="wrap_content"
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109
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android:text="load"
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110
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app:layout_constraintBottom_toBottomOf="@id/save"
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111
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app:layout_constraintEnd_toEndOf="parent"
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112
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app:layout_constraintStart_toStartOf="parent"
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113
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app:layout_constraintTop_toBottomOf="@+id/imageEdit" />
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114
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115
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<Button
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116
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android:id="@+id/save"
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117
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android:layout_width="wrap_content"
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118
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android:layout_height="wrap_content"
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119
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android:text="save"
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120
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app:layout_constraintBottom_toBottomOf="parent"
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121
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app:layout_constraintEnd_toEndOf="parent"
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122
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app:layout_constraintStart_toStartOf="parent"
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123
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app:layout_constraintTop_toBottomOf="@+id/button" />
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124
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125
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</androidx.constraintlayout.widget.ConstraintLayout>
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126
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```
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