在我的应用程序中,我想制作一个带有默认图像配置文件的个人资料页面,并允许用户通过从相机拍摄照片或从图库中选择图像来更改它,我成功完成了这一步,这是我的代码:< / p>
public class MainActivity extends AppCompatActivity {
private static final int pick = 1, capture = 2;
Uri imgeUri, touri;
ImageView imp;
SharedPreferences sh;
SharedPreferences.Editor editor;
String S;
boolean d=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d("eee","in resume");
setContentView(R.layout.activity_main);
sh = getSharedPreferences("my" ,Context.MODE_PRIVATE);
editor=sh.edit();
imp = (ImageView) findViewById(R.id.profile_image);
if(d==false) {
imp.setImageResource(R.drawable.photo);
}
else{
imp.setImageURI(Uri.parse(sh.getString("link", null)));
}
}
public void changepic(View V) {
final String[] items = {"Take picture", "Choose Picture",
"cancle"};
AlertDialog.Builder build = new AlertDialog.Builder(this);
build.setTitle("Add Photo");
build.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (items[which].equals("Choose Picture")) {
Log.d("test","bh");
Intent i = new Intent(Intent.ACTION_PICK);
i.setType("image/*");
startActivityForResult(i, pick);
} else if (items[which].equals("Take picture")) {
Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(i, capture);
}
}
}).create().show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == pick && resultCode == RESULT_OK) {
imgeUri = data.getData();
Log.d("test","pick");
imp.setImageURI(imgeUri);
editor.putString("link",String.valueOf(imgeUri));
//Log.d("test",f);
editor.commit();
d=true;
} else if (requestCode == capture && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
imp.setImageBitmap(imageBitmap);
}
}
但问题是在选择图像时我将其保存在共享偏好中,当我在活动中时,图像显示正常,当转到另一个并返回时消失,活动显示默认图像,我知道之所以这样,是因为每次我回到个人资料活动时都会再次创建,而布尔变量d又是假的。 当我必须调用get偏好时,我该如何解决?
答案 0 :(得分:0)
在“onActivityResult()”方法中,将获得的imageUri(或imagePath)保存到sharedPreferences。
data class Job(
@Expose @SerializedName("type") val type: String, //success
@Expose @SerializedName("text") val text: String, //200
@Expose @SerializedName("data") val data: List<Data>
)
不使用布尔值,而是检查sharedPreference值是否不是空字符串。如果sharedPreference值不是空字符串,请使用sharedPreference中的imageUri(或imagePath)更新imageview。