在android中使用摄像头应用程序时出错
以下是在我的应用程序中使用相机拍照的代码。按下在android中使用摄像头应用程序时出错,android,android-camera,android-camera-intent,android-camera2,Android,Android Camera,Android Camera Intent,Android Camera2,以下是在我的应用程序中使用相机拍照的代码。按下img按钮时,应在imageView中拍摄并显示图片 当我按下按钮时,相机就打开了。但是,拍摄的图像不会显示在图像视图中 调试时,方法onActivityResult()中的if(imgFile.exists())出现错误,并且if中的语句未被执行 MainActivity.java package com.example.nirvan.cameraexample3; import android.content.Intent; import an
img按钮
时,应在imageView
中拍摄并显示图片
当我按下按钮时,相机就打开了。但是,拍摄的图像不会显示在图像视图中
调试时,方法onActivityResult()
中的if(imgFile.exists())
出现错误,并且if
中的语句未被执行
MainActivity.java
package com.example.nirvan.cameraexample3;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.Image;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MainActivity extends AppCompatActivity
{
private String pictureImagePath = "";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button imgButton=(Button) findViewById(R.id.imgButton);
View.OnClickListener imgButtonClickListener=new View.OnClickListener()
{
@Override
public void onClick(View view)
{
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = timeStamp + ".jpg";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
pictureImagePath = storageDir.getAbsolutePath() + "/" + imageFileName;
File file = new File(pictureImagePath);
Uri outputFileUri = Uri.fromFile(file);
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(cameraIntent, 1);
}
};
imgButton.setOnClickListener(imgButtonClickListener);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
Log.d("TAG","CUSTOOOM");
if (requestCode == 1)
{
File imgFile = new File(pictureImagePath);
if (imgFile.exists())
{
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
ImageView myImage = (ImageView) findViewById(R.id.imageViewTest);
myImage.setImageBitmap(myBitmap);
}
}
}
}
MainActivity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.nirvan.cameraexample3.MainActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageViewTest"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="IMG"
android:id="@+id/imgButton"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="56dp" />
</RelativeLayout>
有一些问题
1.)将您的侦听器创建移到外部oncreate
2.)使用已创建的图像文件uri,而不是创建新的图像文件uri
3.)确认结果\u正常
确认
public class MainActivity extends AppCompatActivity {
private String pictureImagePath = "";
private Uri outputFileUri;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button imgButton=(Button) findViewById(R.id.imgButton);
imgButton.setOnClickListener(imgButtonClickListener);
}
View.OnClickListener imgButtonClickListener=new View.OnClickListener()
{
@Override
public void onClick(View view)
{
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = timeStamp + ".jpg";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
pictureImagePath = storageDir.getAbsolutePath() + "/" + imageFileName;
File file = new File(pictureImagePath);
outputFileUri = Uri.fromFile(file);
// It's global to class now
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(cameraIntent, 1);
}
};
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
Log.d("TAG","CUSTOOOM");
if (requestCode == 1 && resultCode == RESULT_OK)
{
//RESULT_OK mean ,image taken successfully
// you can put a file exist check if you want
Bitmap myBitmap = BitmapFactory.decodeFile(outputFileUri);
ImageView myImage = (ImageView) findViewById(R.id.imageViewTest);
myImage.setImageBitmap(myBitmap);
}
}
}
您还需要在清单中添加权限
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
...>
..
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
...
<manifest/>
..
...
或者,如果你的应用程序支持棉花糖及以上,那么你需要实施
@Ghost您是否有
摄像头
并在清单中写入外部存储权限,如果没有,则添加it@Ghost首先尝试使用清单权限,并让我知道是否有任何问题。现在它正在工作,我忘记了清单文件中的权限。谢谢你。我很高兴我能帮上忙,高兴吗coding@Ghost请确保添加运行时权限代码,以支持marshmallow及以上版本。请尝试此操作,它可能是work stackoverflow.com/a/41221852/5488468