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私の目標は、アプリケーションを閉じた後（破棄して）、最後に選択した画像をImageViewに残すことです。アプリを再入力した後に最後に選択した画像をImageViewに読み込む
Iは、私はSharedPreferencesビットマップ、ピカソを使用して、それをロードするパスを格納しようとし、（How can I store images using sharedpreference in android?）」SharedPreferenceにビットマップを保存するために、ロードしようとした：（Picasso Load image from filesystem）としてBitmapFactory.decodeFile(completePath);に値を渡すことによってそれをロードしようとしましたあなたは私のコードで見ることができる
;。私はNullPointerExceptionが取得しています
私は一般的にはAndroidのプログラミングに新しいですので、私の乱雑なコードを許す
private String picturePass;
private ImageView imageView;
private Bitmap picBitmap;
private boolean yes;
private static final int SELECT_PICTURE = 1;
private static final String SAVE_NAME = "MyFile";)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity_page);
if (savedInstanceState != null) {
savedInstanceState.get("path");
}
//loading
SharedPreferences preferences = getSharedPreferences(SAVE_NAME, MODE_PRIVATE);
//boolean to check if Image was chosen
yes = preferences.getBoolean("yes", true);
if(yes){
picturePass = preferences.getString("path", null);
String completePath = picturePass;
//just to check the content
Toast.makeText(this, completePath, Toast.LENGTH_LONG).show();
File file = new File(completePath);
if (file.exists()) {
picBitmap = BitmapFactory.decodeFile(completePath);
imageView.setImageBitmap(picBitmap);
}
}
}
//Choosing a picture from gallery
public void onClickImage(View view) {
Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, SELECT_PICTURE);
yes = true;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == SELECT_PICTURE && resultCode == RESULT_OK && null != data) {
//The only way I maneged to get the file path, that's a messy part
Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
//Setting picture in imageView
if (selectedImage != null) {
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), selectedImage);
imageView = (ImageView) findViewById(R.id.imageView);
imageView.setImageBitmap(bitmap);
picBitmap = bitmap;
//Tried to use Environment.getExternalStorageDirectory().getAbsolutePath() + imageName with no success
//File f = new File(picturePath);
//String imageName = f.getName();
//picturePass = imageName;
picturePass = picturePath;
//Saving image path
//just too check the content
Toast.makeText(this, picturePath, Toast.LENGTH_LONG).show();
SharedPreferences.Editor editor = getSharedPreferences(SAVE_NAME, MODE_PRIVATE).edit();
editor.putString("path", picturePass);
editor.putBoolean("yes", true);
editor.commit();
} catch (Exception ex) {
ex.printStackTrace();
}
}
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString("path", picturePass);
}
}
08-29 19:05:46.263 16436-16436/com.amberapply.vitaliy.iloveyou E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.amberapply.vitaliy.iloveyou, PID: 16436
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.amberapply.vitaliy.iloveyou/com.amberapply.vitaliy.iloveyou.MainActivityPage}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageBitmap(android.graphics.Bitmap)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5258)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:940)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:735)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageBitmap(android.graphics.Bitmap)' on a null object reference
at com.amberapply.vitaliy.iloveyou.MainActivityPage.onCreate(MainActivityPage.java:60)
at android.app.Activity.performCreate(Activity.java:6005)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5258)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:940)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:735)
"MainActivityPage.java:60" 'MainActivityPage.java'の60行目は何ですか？ –