Java 使用 URI 在活动中显示图像
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Displaying an Image in an activity using URI
提问by evkwan
I'm writing an application that uses Intent(MediaStore.ACTION_IMAGE_CAPTURE) to capture and image. On the process of capturing the image, I noted the output of the image's URI. Right after finishing the camera activity, I wish to display the image using this specific URI.
我正在编写一个使用 Intent(MediaStore.ACTION_IMAGE_CAPTURE) 捕获和图像的应用程序。在捕获图像的过程中，我记录了图像 URI 的输出。在完成相机活动后，我希望使用此特定 URI 显示图像。
The method I used to capture images is:
我用来捕捉图像的方法是：
private void saveFullImage() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = new File(Environment.getExternalStorageDirectory(),
"test.jpg");
outputFileUri = Uri.fromFile(file);
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(intent, TAKE_PICTURE);
}
Which is a method taken from Reto Meier's book Professional Android 2 Application Development.
这是一种取自 Reto Meier 的书 Professional Android 2 Application Development 的方法。
The method works fine, and I assume that the URI of the picture I just took is stored in the outputFileUri variable. Then at this point of the code is where I want to display the picture:
该方法工作正常，我假设我刚刚拍摄的图片的 URI 存储在 outputFileUri 变量中。然后在代码的这一点是我要显示图片的地方：
@Override
protected void onActivityResult(int requestCode,
int resultCode, Intent data) {
if (requestCode == TAKE_PICTURE) {
//I want to display the picture I just took here
//using the URI
}
}
I'm not sure how to do it.
我不知道该怎么做。
I tried creating a new layout object and a new ImageView object using the method setImageURI(outputFileUri). My main layout (xml) did not have a ImageView object. But even when I set the contentView to the new layout with the ImageView attached to it, it doesn't display anything. I tried creating a Bitmap object from the URI and set it to the ImageView, but I get an unexpected error and forced exit.
我尝试使用 setImageURI(outputFileUri) 方法创建一个新的布局对象和一个新的 ImageView 对象。我的主布局 (xml) 没有 ImageView 对象。但即使我将 contentView 设置为附加了 ImageView 的新布局，它也不会显示任何内容。我尝试从 URI 创建一个 Bitmap 对象并将其设置为 ImageView，但出现意外错误并强制退出。
I have seen examples from here herewhich creates a Bitmap from URI, but it's not displaying it?
我在这里看到了从 URI 创建位图的示例，但它没有显示它？
My question is just how to display an image in the middle of a running activity? Do I need to get the File Path (like this) in order to display it? If I make a Bitmap out of the URI, how do I display the Bitmap?
我的问题是如何在跑步活动中显示图像？我是否需要获取文件路径（像这样）才能显示它？如果我从 URI 中制作位图，我如何显示位图？
I'm just probably missing something simple...so any help would be a greatly appreciated!
我可能只是遗漏了一些简单的东西……所以任何帮助都将不胜感激！
Also additional question for thought: If I were to take multiple pictures, would you recommend me to use the SimpleCursorAdapter instead?
还有一个需要思考的问题：如果我要拍摄多张照片，您会建议我改用 SimpleCursorAdapter 吗？
Thanks!
谢谢！
回答by mibollma
- You create a Bitmap out of the URI
- You create a new instance of BitmapDrawable passing in the Bitmap
- You add the BitmapDrawable to a Window (setBackgroundDrawable), View (setBackgroundDrawable)] or ImageView (setImageDrawable)
- 您从 URI 创建位图
- 您创建一个新的 BitmapDrawable 实例，传入 Bitmap
- 您将 BitmapDrawable 添加到 Window (setBackgroundDrawable)、View (setBackgroundDrawable)] 或 ImageView (setImageDrawable)
回答by Mark Ingram
Here's the correct way of doing it:
这是正确的做法：
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK)
{
Uri imageUri = data.getData();
Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), imageUri);
}
}
}
回答by Mamad
This question is for long time ago. I hope this answer help somebody who has same question. I just test this code and it works fine.
这个问题是很久以前的了。我希望这个答案能帮助有同样问题的人。我只是测试了这段代码，它工作正常。
java code :
代码：
package com.mywebsite.mohammad.openfiledialog;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
ImageView ImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView = (ImageView) findViewById(R.id.imageView);
Intent intent = new Intent()
.setType("image/*")
.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select a file"), 123);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==123 && resultCode==RESULT_OK) {
Uri selectedfile = data.getData(); //The uri with the location of the file
ImageView.setImageURI(selectedfile);
}
}
}
xml code :
xml代码：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
