在我的应用程序中，我尝试拍照并将其发送到编码为字符串的服务器，当我运行它时，我能够拍照，但是一旦我点击确定应用程序崩溃并且我收到以下错误：
E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/Pictures/test123.jpeg: open failed: EACCES (Permission denied)
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: info.androidhive.loginandregistration, PID: 8775
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:309)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
at info.androidhive.loginandregistration.activity.ImageActivity$Encode_image.doInBackground(ImageActivity.java:86)
at info.androidhive.loginandregistration.activity.ImageActivity$Encode_image.doInBackground(ImageActivity.java:79)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
继承我的代码：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="info.androidhive.loginandregistration"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-feature android:name="android.hardware.Camera" android:required="true"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:name="info.androidhive.loginandregistration.app.AppController"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".activity.LoginActivity"
android:label="@string/app_name"
android:launchMode="singleTop"
android:windowSoftInputMode="adjustPan" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".activity.RegisterActivity"
android:label="@string/app_name"
android:launchMode="singleTop"
android:windowSoftInputMode="adjustPan" />
<activity
android:name=".activity.MainActivity"
android:label="@string/app_name"
android:launchMode="singleTop" />
<activity
android:name=".activity.test"
android:label="@string/app_name"
android:launchMode="singleTop" />
<activity
android:name=".activity.SearchActivity"
android:label="MY SICK APP"
android:launchMode="singleTop" />
<activity
android:name=".activity.ImageActivity"
android:label="MY SICK APP"
android:launchMode="singleTop"
android:largeHeap="true"/>
</application>
</manifest>
-
public class ImageActivity extends Activity{
final String URL = "linktophpfile";
private Button button;
private String coded_string, name;
private Bitmap bitmap;
private File file;
private Uri uri;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.image_main);
button = (Button) findViewById(R.id.bt_main);
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick (View view){
Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
getUri();
i.putExtra(MediaStore.EXTRA_OUTPUT,uri);
startActivityForResult(i,5);
}
});
}
public void getUri() {
String name = "test123.jpeg";
file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+ file.separator + name);
uri = Uri.fromFile(file);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==5 && resultCode== RESULT_OK){
new Encode_image().execute();
}
}
private class Encode_image extends AsyncTask<Void,Void,Void> {
@Override
protected Void doInBackground(Void... voids) {
bitmap = BitmapFactory.decodeFile(uri.getPath());
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG,100,stream);
bitmap.recycle();
byte[] array = stream.toByteArray();
coded_string = Base64.encodeToString(array,0);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
makeRequest();
}
}
private void makeRequest() {
RequestQueue queue = Volley.newRequestQueue(this);
StringRequest request = new StringRequest(Request.Method.POST,URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
}
}, new Response.ErrorListener(){
@Override
public void onErrorResponse(VolleyError error){
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError{
HashMap<String, String> map = new HashMap<>();
map.put("coded_String", coded_string);
map.put("image_name", name);
return map;
}
};
queue.add(request);
}
}
php代码：
<?php
header('Content-type : bitmap; charset=utf-8');
if(isset($_POST["encoded_string"])){
$encoded_string = $_POST["encoded_string"];
$image_name = $_POST["image_name"];
$decoded_string = base64_decode($encoded_string);
$path = 'images/'.$image_name;
$file = fopen($path, 'wb');
$is_written = fwrite($file, $decoded_string);
fclose($file);
if($is_written > 0) {
$connection = mysqli_connect('localhost', 'username', 'password','dbname');
$query = "INSERT INTO images(name,path) values('$image_name','$path');";
$result = mysqli_query($connection, $query) ;
if($result){
echo "success";
}else{
echo "failed";
}
mysqli_close($connection);
}
}
?>
任何可能出错的想法？感谢
答案 0 :(得分：0)
确保你有
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
在manifest.xml文件中声明
答案 1 :(得分：0)
1在手机设置中查看您应用的权限状态。 2在调试模式下查看此照片的真实uri。