ImageView 没有正确更新
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【中文标题】ImageView 没有正确更新【英文标题】：ImageView does not update properly 【发布时间】：2013-10-21 19:57:25 【问题描述】：在我的应用程序中，我有两个尺寸相同且工作正常的 imageView。但是，当我将图片放入每个 imageView 中，然后尝试用不同的图片切换顶部的 imageView 时，底部的 imageView 最终会得到应该放在顶部 imageView 中的图片。我不确定这是为什么。这是我的 xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:orientation="vertical" >
<TextView
android:id="@+id/personalizetextView1"
android:layout_
android:layout_
android:text="@string/customize"
android:textSize="30sp"
android:gravity="center"
android:layout_marginTop="20dip"/>
<TextView
android:id="@+id/personalizetextviewChangeBackground"
android:layout_
android:layout_
android:text="@string/customizebackground"
android:gravity="center" />
<ImageView
android:id="@+id/imageView1"
android:layout_
android:layout_
android:adjustViewBounds="true"
android:maxWidth="100dp"
android:maxHeight="100dp"
android:scaleType="fitCenter"
android:contentDescription="@string/descForBackground"
/>
<Button
android:id="@+id/btnChangeImage"
android:layout_
android:layout_
android:text="@string/change_background" />
<TextView
android:id="@+id/personalizetextviewChangeIcon"
android:layout_
android:layout_
android:text="@string/change_icon"
android:gravity="center" />
<ImageView
android:id="@+id/imageView2Icon"
android:layout_
android:layout_
android:adjustViewBounds="true"
android:maxWidth="100dp"
android:maxHeight="100dp"
android:scaleType="fitCenter"
android:contentDescription="@string/descForIcon"
/>
<Button
android:id="@+id/btnChangeImageForIcon"
android:layout_
android:layout_
android:text="@string/change_icon" />
</LinearLayout>
然后这是我的 java 编码：
package com.example.awesomefilebuilderwidget;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class Personalize extends Activity
Button button;
ImageView image;
ImageView image2;
Button btnChangeImage;
Button btnChangeImageForIcon;
private static final int SELECT_PICTURE = 1;
private String selectedImagePath;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.personalize);
addListenerOnButton();
public void addListenerOnButton()
image = (ImageView) findViewById(R.id.imageView1);
btnChangeImage = (Button) findViewById(R.id.btnChangeImage);
btnChangeImage.setOnClickListener(new OnClickListener()
@Override
public void onClick(View arg0)
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, SELECT_PICTURE);
);
public String getPath(Uri uri)
String[] projection = MediaStore.Images.Media.DATA ;
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
if (resultCode == RESULT_OK)
if (requestCode == SELECT_PICTURE)
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
try
FileInputStream fileis=new FileInputStream(selectedImagePath);
BufferedInputStream bufferedstream=new BufferedInputStream(fileis);
byte[] bMapArray= new byte[bufferedstream.available()];
bufferedstream.read(bMapArray);
Bitmap bMap = BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length);
//Here you can set this /Bitmap image to the button background image
image.setImageBitmap(bMap);
if (fileis != null)
fileis.close();
if (bufferedstream != null)
bufferedstream.close();
catch (FileNotFoundException e)
e.printStackTrace();
catch (IOException e)
e.printStackTrace();
image = (ImageView) findViewById(R.id.imageView2Icon);
btnChangeImageForIcon = (Button) findViewById(R.id.btnChangeImageForIcon);
btnChangeImageForIcon.setOnClickListener(new OnClickListener()
@Override
public void onClick(View arg0)
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, SELECT_PICTURE);
);
public boolean saveImageToInternalStorage(Bitmap image)
try
FileOutputStream fos = this.openFileOutput("desiredFilename.png", Context.MODE_PRIVATE);
image.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
return true;
catch (Exception e)
return false;
我正在使用的更新代码：
package com.example.awesomefilebuilderwidget;
IMPORTS
public class Personalize extends Activity implements OnClickListener
Button button;
ImageView image;
ImageView image2;
Button btnChangeImage;
Button btnChangeImageForIcon;
private static final int SELECT_PICTURE = 1;
private static final int SELECT_PICTURE_2 = 2;
private String selectedImagePath;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.personalize);
Button btnChangeImage = (Button) findViewById(R.id.btnChangeImage);
btnChangeImage.setOnClickListener(this);
Button btnChangeImageForIcon = (Button) findViewById(R.id.btnChangeImageForIcon);
btnChangeImageForIcon.setOnClickListener(this);
@Override
public void onClick(View v)
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, SELECT_PICTURE);
;
public String getPath(Uri uri)
String[] projection = MediaStore.Images.Media.DATA ;
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
if (resultCode == RESULT_OK)
if (requestCode == SELECT_PICTURE)
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
Bitmap b1 = getAndDecodeImage(selectedImagePath);
if(b1 != null)
image.setImageBitmap(b1);
else if (requestCode == SELECT_PICTURE_2)
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
Bitmap b2 = getAndDecodeImage(selectedImagePath);
if(b2 != null)
image2.setImageBitmap(b2);
private Bitmap getAndDecodeImage(String selectedImagePath)
try
FileInputStream fileis=new FileInputStream(selectedImagePath);
BufferedInputStream bufferedstream=new BufferedInputStream(fileis);
byte[] bMapArray= new byte[bufferedstream.available()];
bufferedstream.read(bMapArray);
Bitmap bMap = BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length);
//Here you can set this /Bitmap image to the button background image
return bMap;
if (fileis != null)
fileis.close();
if (bufferedstream != null)
bufferedstream.close();
catch (FileNotFoundException e)
e.printStackTrace();
catch (IOException e)
e.printStackTrace();
return null;
public boolean saveImageToInternalStorage(Bitmap image)
try
FileOutputStream fos = this.openFileOutput("desiredFilename.png", Context.MODE_PRIVATE);
image.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
return true;
catch (Exception e)
return false;
【问题讨论】：
image = (ImageView) findViewById(R.id.imageView2Icon); ???为什么不使用两个不同的引用？
你能解释一下你的意思吗？
最初，您将 image 设置为引用顶部图像视图 image = (ImageView) findViewById(R.id.imageView1);。然后你改变的是下部图像视图。然后你改变图像。你为什么不使用两个参考，例如图像视图1，图像视图2。
所以我把第二张图片改成了image2 = (ImageView) findViewById(R.id.imageView2Icon); 是这个意思吗？ （只是确保）
是的。当你想设置顶部图像视图时，image1.setImageBitmap()、image2.setImageBitmap() 设置底部一个。 imageTop 和 imageBottom 可能是更好的名字？
【参考方案1】：
您使用的是相同的 resultCode SELECT_PICTURE所以结果可以转到任何一个。
您应该为要启动的两个操作使用不同的结果代码。
编辑
帮助 cmets 中所说的代码：
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
if (resultCode == RESULT_OK)
if (requestCode == SELECT_PICTURE)
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
Bitmap b1 = getAndDecodeImage(selectedImagePath);
if(b1 != null)
image.setImageBitmap(b1);
else if (requestCode == SELECT_PICTURE_2)
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
Bitmap b2 = getAndDecodeImage(selectedImagePath);
if(b2 != null)
image2.setImageBitmap(b2);
private Bitmap getAndDecodeImage(String selectedImagePath)
try
FileInputStream fileis=new FileInputStream(selectedImagePath);
BufferedInputStream bufferedstream=new BufferedInputStream(fileis);
byte[] bMapArray= new byte[bufferedstream.available()];
bufferedstream.read(bMapArray);
Bitmap bMap = BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length);
if (fileis != null)
fileis.close();
if (bufferedstream != null)
bufferedstream.close();
return bMap;
catch (FileNotFoundException e)
e.printStackTrace();
catch (IOException e)
e.printStackTrace();
return null;
【讨论】：
随你所愿...例如在开头旁边的另一个：private static final int SELECT_PICTURE_2 = 2;
我将它和底部的实例更改为SELECT_PICTURE_2，但运行程序时仍然遇到同样的问题
尝试将两段代码放在onActivityResult 方法中，而不是使用这个SecondonActivityResult
请使用方便的方法进行所有图像解码，您正在重复很多代码......
“方便法”是什么意思？既然你这么说，我想知道如何简化这一点，因为我摆脱了SecondonActivityResult，但随后又为 SELECT_PICTURE_2 代码创建了另一个 if 语句以上是关于ImageView 没有正确更新的主要内容，如果未能解决你的问题，请参考以下文章
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