【发布时间】：2017-09-01 20:01:27
【问题描述】：
我是 Android Studio 的初学者。我的应用程序允许我添加用户（fn、ln、adrs、Uri::ImageUri）并列出他们并查看他们的信息。 我希望能够在单击我的列表视图时显示一个用户的信息。
问题是我只得到一个空白空间而不是我想要的图像视图。
我的主要活动：
公共类 MainActivity 扩展 AppCompatActivity {
public static ArrayList <User> users =new ArrayList <User>();
public static User userSelected;
public static ListView mListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(activity_main);
mListView = (ListView) findViewById(R.id.List);
}
public void InputInfo(View view) {
Intent AddEmployee = new Intent(this, NewEmployeeInfo.class);
startActivityForResult(AddEmployee,0);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(0, resultCode, data);
finaltest =NewEmployeeInfo .targetUri ;
UserAdapter useradapter;
useradapter = new UserAdapter (MainActivity .this, android.R.layout.simple_list_item_1, users ) ;
mListView.setAdapter(useradapter );
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View view, int position, long arg) {
Intent appInfo = new Intent(MainActivity.this, DisplayInfo.class);
User temp= users.get(position );
userSelected =new User(temp.first_name ,temp.last_name,temp.adr,temp.url );
startActivity(appInfo);
}
});
}
}
我的第二个（用户输入信息的地方：
public class NewEmployeeInfo extends AppCompatActivity {
public ImageView imageview;
public ImageView targetImage;
public User u;
public static Bitmap photo;
public static Uri targetUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_employee_info);
}
public void takePhoto(View view) {
Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(takePicture, 0);
}
public void pickphoto(View view) {
Intent pickPhoto = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(pickPhoto, 1);
}
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
imageview = (ImageView) this.findViewById(imageView);
resultphoto(requestCode, resultCode, imageReturnedIntent);
}
public void Save(View view) {
Intent SaveDataIntent = new Intent(this, MainActivity.class);
EditText FN = (EditText) findViewById(R.id.editText);
EditText LN = (EditText) findViewById(R.id.editText5);
EditText ADDRESS = (EditText) findViewById(R.id.editText6);
String firstname = FN.getText().toString();
String lastname = LN.getText().toString();
String address = ADDRESS.getText().toString();
if (firstname.length() == 0 || lastname.length() == 0 || address.length() == 0) {
Toast.makeText(this, "No Emty Fields!!",
Toast.LENGTH_LONG).show();
return;
}
u = new User(firstname, lastname, address, targetUri);
users.add(u);
setResult(RESULT_OK, SaveDataIntent);
finish();
}
private void resultphoto(int requestCode, int resultCode, Intent imageReturnedIntent) {
switch (requestCode) {
case 0:
if (resultCode == RESULT_OK) {
targetUri = imageReturnedIntent.getData();
imageview.setImageURI(targetUri);
imageReturnedIntent.getExtras().get("data");
}
break;
case 1:
if (resultCode == RESULT_OK) {
targetUri = imageReturnedIntent.getData();
targetImage = (ImageView) findViewById(imageView);
try {
photo = BitmapFactory.decodeStream(getContentResolver().openInputStream(targetUri));
targetImage.setImageBitmap(photo);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
break;
}
}
}
第三个也是最后一个（应该显示信息的位置）
public class DisplayInfo extends AppCompatActivity {
public ImageView imageView;
public Bitmap image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_info);
TextView fn = (TextView) findViewById(R.id.firstname);
TextView ln = (TextView) findViewById(R.id.lastname);
TextView adr = (TextView) findViewById(R.id.address);
imageView = (ImageView) findViewById(R.id.imageView2);
fn.setText(MainActivity.userSelected.first_name);
ln.setText(MainActivity.userSelected.last_name);
adr.setText(MainActivity.userSelected.adr);
imageView.setImageURI(MainActivity.userSelected.url ) ;
这个错误不断出现
E/DatabaseUtils：将异常写入包裹 java.lang.SecurityException：权限拒绝：从 pid=12644、uid=10280 读取 com.android.providers.media.MediaProvider uri content://media/external/images/media/810 需要 android.permission.READ_EXTERNAL_STORAGE 或 grantUriPermission ()
虽然我在清单文件中包含了这些权限：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
【问题讨论】：
-
向我们展示整个清单 XML
-
我认为您需要运行时权限，但没有完整清单就无法判断
-
您在哪个设备上运行该应用程序？我的意思是哪个 api 是无效的。
标签： java android permissions