使用Intent启动Android Camera时发生崩溃

Question

我是Android编程的新手。 而且我的应用程序中出现一个莫名其妙的异常，希望您能为我提供帮助。 该应用程序涵盖以下用例：

1. 用户按下“拍照”按钮
2. Google相机将打开
3. 图像将保存在设备的存储器中
4. 路径，存储图像的位置将成为列表视图中的列表
5. 用户可以再次单击“拍照”按钮（转到2）

第一次，用户可以成功拍摄照片，并且路径将在应用程序中正确显示。 但是在再次单击的情况下，用户可以拍摄照片，但是当我要保存图像时，应用程序会崩溃且没有异常。

扫描文件

package de.des;

import android.content.Intent;
import android.content.res.Configuration;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;


import java.util.ArrayList;
import java.util.List;

import de.auftrag.R;

public class Scanning extends AppCompatActivity {

    private List<String> pathlist;
    private ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scanning);

        final ListView listview = (ListView) findViewById(R.id.listView);
        mimageView = (ImageView) this.findViewById(R.id.imageView);

        pathlist = new ArrayList<>();

        adapter = new ArrayAdapter<String>(this,R.layout.mylist, pathlist);

        listview.setAdapter(adapter);
    }


    private static final int TAKE_PHOTO_CODE = 1;
    public void takePhoto(View view) {

    File file = new File(Environment.getExternalStorageDirectory(), "fname_" +
            String.valueOf(System.currentTimeMillis()) + ".jpg");
    try {
        file.createNewFile();
        this.pathlist.add(file.getAbsolutePath());
        this.adapter.notifyDataSetChanged();
    } catch (IOException e) {
        Log.d("Scanning",e.getMessage());
    }

    Uri outputFileUri = Uri.fromFile(file);
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
    startActivityForResult(cameraIntent, 3);

        }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

    }

}

activity_scanning.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="de.des.Scanning">

    <Button
        android:id="@+id/btnTakePhoto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/str_take_foto"
        android:onClick="takePhoto"/>

    <Button
        android:id="@+id/btnSelectFile"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/str_read_file"
        android:onClick="selectFile"
        android:layout_below="@+id/btnTakePhoto"
        android:layout_alignParentStart="true" />

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:layout_below="@+id/btnSelectFile"
        android:layout_alignParentStart="true"
        android:layout_marginTop="73dp" />



</RelativeLayout>

AndroidMainifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.auftrag">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />


    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.CAMERA"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/logo"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name="de.des.Scanning"
            android:configChanges="orientation|screenSize"/>
        <activity android:name="de.des.ObjektdatenMap" />
    </application>
</manifest>

最好的祝福多米尼克

Answer 1

尝试这个：

private static final int TAKE_PHOTO_CODE = 1;
public void takePhoto(View view) {
    File file = new File(Environment.getExternalStorageDirectory(), "fname_" +
            String.valueOf(System.currentTimeMillis()) + ".jpg");
    Uri outputFileUri = Uri.fromFile(file);
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    cameraIntent.putExtra("pic_path", file.getAbsolutePath());
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
    startActivityForResult(cameraIntent, TAKE_PHOTO_CODE);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) {
        case TAKE_PHOTO_CODE:
            if(resultCode == Activity.RESULT_OK) {
                Uri imageUri = data.getData();
                String path = data.getExtras().getString("pic_path");
                pathlist.add(path);
                adapter.notifyDataSetChanged();
            }
            break;
    }
}