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剛接觸android並遇到應用程序不在Emulator上崩潰但在手機上崩潰的情況。所以我沒有機會看到導致應用程序崩潰的原因。Android：應用程序在我的手機上崩潰，但在IntentService期間不在模擬器上
該應用程序運行的IntentService，不斷看起來圖像的文件夾中： - 上傳新的圖片到我的服務器 - 圖像複製到另一個文件夾 - 從原來的文件夾中刪除圖像 - 返回尋找下一張圖片
我已經用最小的UI設置了我的應用程序。只有2個活動：1.主要活動，以及2.設置文件夾首選項的活動。主要活動有兩個按鈕：1.啓動服務，以及2.停止服務。
當我啓動服務並將圖像複製到指定文件夾時，圖像將上傳到我的服務器，然後移動到指定的移動到電話文件夾 - 很好。但是我猜想，當程序返回查看下一個文件的文件夾時，發生了一些迫使應用程序崩潰的情況。
IntentService：
import android.app.IntentService;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import javax.net.ssl.HttpsURLConnection;
public class incomingPicListener extends IntentService {
Bitmap photoCapturedBitmap;
private static final String RESULT_SUCCESS = "success";
private static final String URL_SAVE_IMAGE = "http://.....php";
Boolean imgsaved;
String fileFound;
public incomingPicListener() {
super("incomingPicListener");
}
@Override
public int onStartCommand(Intent intent, int flags, int startid){
Toast.makeText(incomingPicListener.this, "Service started...", Toast.LENGTH_LONG).show();
System.out.println("Service Started");
return super.onStartCommand(intent,flags,startid);
}
@Override
public void onDestroy(){
super.onDestroy();
System.out.println("Service Stopped");
Toast.makeText(incomingPicListener.this, "Service stopped...", Toast.LENGTH_LONG).show();
}
@Override
protected void onHandleIntent(Intent intent) {
SharedPreferences folderPrefs = getSharedPreferences("FolderPrefs", 0);
final String savedFolder = folderPrefs.getString("FolderInput", "<Empty>");
final String savedTargetPhoneFolder = folderPrefs.getString("TargetPhoneFolder", "<Empty>");
synchronized (this) {
int count = 0;
while (count<10) {
try {
wait(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
File dir = new File(savedFolder);
File[] directoryListing = dir.listFiles(new FilenameFilter() {
public boolean accept(File dir, String name) {
fileFound=name;
return name.toLowerCase().endsWith(".JPG");
}
});
String filepath = savedFolder+"/"+fileFound;
File check = new File(savedFolder+"/"+fileFound);
if ((!check.isDirectory()) && fileFound != null) {
String imagepath= savedFolder + "/" + fileFound;
if(setupImage(imagepath)){
moveFile(imagepath, savedTargetPhoneFolder + "/" + fileFound);
}else{
Toast.makeText(incomingPicListener.this, "Upload failed: " +imagepath, Toast.LENGTH_LONG).show();
}
}
}
}
}
public boolean setupImage(String imgpath){
photoCapturedBitmap = BitmapFactory.decodeFile(imgpath);
String str = getStringImage(photoCapturedBitmap);
HashMap HashMap = new HashMap();
HashMap.put("name",fileFound);
HashMap.put("image", str);
String result = sendPostRequest(URL_SAVE_IMAGE, HashMap);
if (result.toLowerCase().contains(RESULT_SUCCESS)){
return true;
}else {
return false;
}
}
public String getStringImage(Bitmap paramBitmap)
{
ByteArrayOutputStream localByteArrayOutputStream = new ByteArrayOutputStream();
paramBitmap.compress(Bitmap.CompressFormat.JPEG, 100, localByteArrayOutputStream);
return Base64.encodeToString(localByteArrayOutputStream.toByteArray(), 0);
}
public void moveFile(String origFile, String trgFile){
InputStream inStream = null;
OutputStream outStream = null;
try{
File afile =new File(origFile);
File bfile =new File(trgFile);
inStream = new FileInputStream(afile);
outStream = new FileOutputStream(bfile);
byte[] buffer = new byte[1024];
int length;
//copy the file content in bytes
while ((length = inStream.read(buffer)) > 0){
outStream.write(buffer, 0, length);
}
inStream.close();
outStream.close();
//delete the original file
afile.delete();
System.out.println("File is copied successful!");
}catch(IOException e){
e.printStackTrace();
}
}
public String sendPostRequest(String requestURL, HashMap<String, String> postDataParams) {
URL url;
StringBuilder sb = new StringBuilder();
try {
url = new URL(requestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(15000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
DataOutputStream os = new DataOutputStream (conn.getOutputStream());
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(getPostDataString(postDataParams));
writer.flush();
writer.close();
os.close();
int responseCode = conn.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
sb = new StringBuilder();
String response;
while ((response = br.readLine()) != null) {
sb.append(response);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return sb.toString();
}
public String getPostDataString(HashMap<String, String> params) throws UnsupportedEncodingException {
StringBuilder result = new StringBuilder();
boolean first = true;
for (Map.Entry<String, String> entry : params.entrySet()) {
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
}
return result.toString();
}
}
enter code here
主要活動：
import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
TextView status;
Intent loader;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
status = (TextView) findViewById(R.id.tvCurrentState);
Button btnPref = (Button) findViewById(R.id.bFolderLocations);
Button btnEnable = (Button) findViewById(R.id.bEnableProcess);
Button btnDisable = (Button) findViewById(R.id.bDisableProcess);
btnPref.setOnClickListener(this);
btnEnable.setOnClickListener(this);
btnDisable.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bFolderLocations:
startActivity(new Intent(MainActivity.this, FolderPref.class));
break;
case R.id.bEnableProcess:
startService(this);
status.setText("Enabled");
break;
case R.id.bDisableProcess:
stopService(this);
status.setText("Disabled");
break;
}
}
public void startService(MainActivity view){
Intent intent = new Intent(this,incomingPicListener.class);
startService(intent);
}
public void stopService (MainActivity view){
Intent intent = new Intent(this,incomingPicListener.class);
stopService(intent);
}
}
這裏的清單：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.imgloader..." >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".FolderPref"
android:label="@string/title_activity_folder_pref" >
</activity>
<service
android:name=".incomingPicListener"
android:exported="false" >
</service>
<activity
android:name=".DirectoryChooserActivity"
android:label="@string/title_activity_directory_chooser" >
</activity>
</application>
</manifest>
很高興看到崩潰消息。 – mikeD
我能在手機上看到嗎？ –
如果您的手機已連接，那麼您可以在Android Studio中看到Logcat中發生的一切。 – mikeD