我是Android的编程新手。我在我的应用程序中得到了一个莫名其妙的异常,我希望你能帮助我。该应用程序涵盖以下用例:
首次用户可以拍照成功,路径将在应用中正确显示。但是如果再次点击,用户可以拍照,但当我想要保存图像时应用程序崩溃而没有例外。
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);
}
}
<?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>
<?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>
祝福 多米尼克
答案 0 :(得分:0)
试试这个:
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;
}
}