我有一个活动/意图，其中从设备读取文本文件（包含JSON数组）。 在每次重新加载时，数组中的另一行正在进行处理。 文本文件不是很大（20 Kb），而是在MainActivity中下载，还有一些图像（最多50个），介于20到70 Kb之间。
每次重新加载intent并且另一行是进程时，另一个图像被加载到ImageView中。另外几个TextViews使用从JSON数组中读取的字符串进行更新。
问题在于，每次重新加载意图时，内存使用量都会增加大约1 Mb。
我通过使用：
来证明这一点Runtime runtime = Runtime.getRuntime();
long usedMemory=runtime.totalMemory() / (1024 * 1024);
Bitmap被回收， BufferedWriter已关闭， FileInputStream已关闭， BufferedReader已关闭 InputStreamReader已关闭
我错过了什么导致内存使用量增加？
这是活动的代码形式：
public class LoadRaaplijstActivity extends AppCompatActivity {
private TextView locatieText;
private TextView totaalText;
private TextView inhoudText;
private TextView descriptionText;
private TextView eanText;
private TextView ditpadText;
private TableLayout layout16;
private TableLayout layout32;
private Button raapbuttonNext;
private Menu menu;
private Toast toast;
private String next;
private String prev;
private String deze;
private String ean;
private String foto;
private String description;
private String voorraad;
private String totaal;
private String inhoud;
private JSONArray bakken;
private int aantalbakken;
private String einde = "";
private String loadeinde = "0";
private String picked;
private String locatie;
private String locatiepadclean;
private String locatiemeterclean;
private String locatieplankclean;
private String locatievakjeclean;
private String pijl;
private String totaalditpad;
private String batch;
private String kar;
private String raper;
private String afmaken;
String spinneridSelected;
String spinnerkarSelected;
String spinnerraperSelected;
String radioAfmakenSelected;
Bitmap myBitmap;
ArrayList<Integer> gehadArray = new ArrayList<Integer>();
//JSON array
private JSONArray raaplijstresult;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Thread.setDefaultUncaughtExceptionHandler(new ExceptionHandler(this));
setContentView(R.layout.activity_load_raaplijst);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
findViewById(R.id.productimage).setVisibility(View.GONE);
findViewById(R.id.wificonnectie).setVisibility(View.GONE);
findViewById(R.id.probeeropnieuw).setVisibility(View.GONE);
findViewById(R.id.raapbuttonNext).setVisibility(View.VISIBLE);
findViewById(R.id.raapbuttonPrev).setVisibility(View.VISIBLE);
raapbuttonNext = (Button) findViewById(R.id.raapbuttonNext);
raapbuttonNext.setFocusable(true);
raapbuttonNext.setFocusableInTouchMode(true);
raapbuttonNext.requestFocus();
locatieText = (TextView) findViewById(R.id.locatieText);
totaalText = (TextView) findViewById(R.id.totaalText);
inhoudText = (TextView) findViewById(R.id.inhoudText);
eanText = (TextView) findViewById(R.id.eanText);
ditpadText = (TextView) findViewById(R.id.ditpadTxt);
descriptionText = (TextView) findViewById(R.id.descriptionText);
layout16 = (TableLayout) findViewById(R.id.layout16);
layout32 = (TableLayout) findViewById(R.id.layout32);
Intent intent = getIntent();
spinneridSelected = intent.getStringExtra("spinneridSelected");
spinnerkarSelected = intent.getStringExtra("spinnerkarSelected");
spinnerraperSelected = intent.getStringExtra("spinnerraperSelected");
radioAfmakenSelected = intent.getStringExtra("radioAfmakenSelected");
deze = intent.getStringExtra("load");
batch = spinneridSelected;
kar = spinnerkarSelected;
raper = spinnerraperSelected;
afmaken = radioAfmakenSelected;
if(afmaken.equals("ja")){
deze = getLaatstgehad();
}
Integer gehad = Integer.parseInt(deze.toString());
gehadArray = intent.getIntegerArrayListExtra("gehadArray");
if(!gehadArray.contains(gehad)) {
try {
gehadArray.add(gehad);
} catch (NumberFormatException nfe) {
System.out.println("Could not parse " + nfe);
}
}else{
locatieText.setTextColor(Color.GREEN);
}
saveGehad();
getRaaplijstRegel();
}
private void saveGehad() {
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File(root.getAbsolutePath() + "/Raaplijst");
File file = new File(dir, "/gehad.txt");
if(file.exists()) file.delete();
try {
BufferedWriter buf = new BufferedWriter(new FileWriter(file, true));
buf.write(deze.toString());
buf.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private String getLaatstgehad() {
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File(root.getAbsolutePath() + "/Raaplijst");
File file = new File(dir, "/gehad.txt");
String ret = deze;
if(file.exists()){
try {
FileInputStream inputStream = new FileInputStream (file);
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString);
}
inputStreamReader.close();
bufferedReader.close();
inputStream.close();
String gehadFromFile = stringBuilder.toString();
ret = gehadFromFile;
}
}
catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}else{
ret = deze;
}
return ret;
}
public void loadPrev (View view){
loadRaaplijstPrev();
}
public void loadRaaplijstPrev (){
if (prev.equals("-1")) {
Intent intent = new Intent(this, GratisProducten.class);
Bundle extras = new Bundle();
extras.putString("spinneridSelected", batch);
extras.putString("spinnerkarSelected", kar);
extras.putString("spinnerraperSelected", raper);
extras.putString("radioAfmakenSelected", "nee");
extras.putIntegerArrayList("gehadArray", gehadArray);
intent.putExtras(extras);
startActivity(intent);
finish();
} else {
Intent intent = new Intent(this, LoadRaaplijstActivity.class);
Bundle extras = new Bundle();
extras.putString("load", prev);
extras.putString("spinneridSelected", batch);
extras.putString("spinnerkarSelected", kar);
extras.putString("spinnerraperSelected", raper);
extras.putString("radioAfmakenSelected","nee");
extras.putIntegerArrayList("gehadArray", gehadArray);
intent.putExtras(extras);
startActivity(intent);
finish();
}
}
public void loadBegin (View view){
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
}
public void loadBegin(){
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
}
public void loadNext (View view){
loadRaaplijstNext();
}
public void loadRaaplijstNext (){
if (loadeinde.equals("1")) {
loadEnd();
} else {
Intent intent = new Intent(this, LoadRaaplijstActivity.class);
Bundle extras = new Bundle();
extras.putString("spinneridSelected", batch);
extras.putString("spinnerkarSelected", kar);
extras.putString("spinnerraperSelected", raper);
extras.putString("radioAfmakenSelected","nee");
extras.putString("load", next);
extras.putIntegerArrayList("gehadArray", gehadArray);
intent.putExtras(extras);
startActivity(intent);
finish();
}
}
public void loadEnd(){
Intent intent = new Intent(this, EndActivity.class);
Bundle extras = new Bundle();
extras.putString("einde", einde);
extras.putString("load", deze);
extras.putString("spinneridSelected", batch);
extras.putString("spinnerkarSelected", kar);
extras.putString("spinnerraperSelected", raper);
extras.putString("radioAfmakenSelected", "nee");
extras.putIntegerArrayList("gehadArray", gehadArray);
intent.putExtras(extras);
startActivity(intent);
finish();
}
private String readRaaplijstFromFile() {
String ret = "Raaplijst niet gevonden";
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File(root.getAbsolutePath() + "/Raaplijst");
try {
FileInputStream inputStream = new FileInputStream (new File(dir + "/raaplijstJSON.txt"));
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString);
}
inputStreamReader.close();
bufferedReader.close();
inputStream.close();
ret = stringBuilder.toString();
}
}
catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return ret;
}
private void getRaaplijstRegel(){
String raaplijstJson = readRaaplijstFromFile();
if(raaplijstJson.equals("Raaplijst niet gevonden")){
}else{
try {
JSONObject j = new JSONObject(raaplijstJson);
raaplijstresult = j.getJSONArray(Config.JSON_ARRAY_RAAPLIJST);
getRegel(raaplijstresult);
} catch (JSONException e) {StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
String stacktrace = sw.toString();
writeExceptionToFile(stacktrace);
e.printStackTrace();
}
}
}
private void getRegel(JSONArray j) {
for (int h = 0; h < j.length(); h++) {
try {
JSONObject sorteerObj = j.getJSONObject(h);
JSONArray sorteer = sorteerObj.getJSONArray("sorteer");
int i = Integer.parseInt(deze);
try {
JSONObject json = sorteer.getJSONObject(i);
einde = json.getString("einde");
loadeinde = json.getString("loadeinde");
if(loadeinde.equals("1")){
loadEnd();
}
ean = json.getString("ean");
eanText.setText("EAN: " + ean);
locatie = json.getString("locatie");
locatieText.setText(locatie);
locatiepadclean = json.getString("locatiepad");
if(locatiepadclean.equals("leeg")){
locatiepadclean = "";
}
locatiemeterclean = json.getString("locatiemeter");
if(locatiemeterclean.equals("leeg")){
locatiemeterclean = "";
}
locatieplankclean = json.getString("locatieplank");
if(locatieplankclean.equals("leeg")){
locatieplankclean = "";
}
locatievakjeclean = json.getString("locatievakje");
if(locatievakjeclean.equals("leeg")){
locatievakjeclean = "";
}
picked = json.getString("picked");
if(picked.equals("1")) {
locatieText.setTextColor(Color.GREEN);
}
foto = json.getString("foto");
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File(root.getAbsolutePath() + "/Raaplijst");
File imgFile = new File(dir + "/" + foto);
if(imgFile.exists()){
if (myBitmap != null) {
myBitmap.recycle();
myBitmap = null;
}
myBitmap = decodeFile(imgFile, 231, 231);
ImageView bindImage = (ImageView) findViewById(R.id.productimage);
bindImage.setImageBitmap(myBitmap);
}else{
toast = Toast.makeText(getApplicationContext(), imgFile.toString(), Toast.LENGTH_LONG);
toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 20);
toast.show();
}
findViewById(R.id.loadingPanel).setVisibility(View.GONE);
findViewById(R.id.productimage).setVisibility(View.VISIBLE);
description = json.getString("description");
descriptionText.setText(description);
voorraad = json.getString("voorraad");
aantalbakken = Integer.parseInt(json.getString("aantalbakken"));
if(aantalbakken == 32){
findViewById(R.id.layout16).setVisibility(View.GONE);
findViewById(R.id.layout32).setVisibility(View.VISIBLE);
findViewById(R.id.layout32).setOnTouchListener(new OnSwipeTouchListener(LoadRaaplijstActivity.this) {
public void onSwipeTop() {
}
public void onSwipeRight() {
loadRaaplijstPrev();
}
public void onSwipeLeft() {
loadRaaplijstNext();
}
public void onSwipeBottom() {
}
});
}else{
findViewById(R.id.layout32).setVisibility(View.GONE);
findViewById(R.id.layout16).setVisibility(View.VISIBLE);
findViewById(R.id.layout16).setOnTouchListener(new OnSwipeTouchListener(LoadRaaplijstActivity.this) {
public void onSwipeTop() {
}
public void onSwipeRight() {
loadRaaplijstPrev();
}
public void onSwipeLeft() {
loadRaaplijstNext();
}
public void onSwipeBottom() {
}
});
}
int b = 0;
int[] textViewIds;
int[] bakdrawables;
if(aantalbakken == 32) {
textViewIds = new int[]{R.id.b32, R.id.b33, R.id.b34, R.id.b35, R.id.b36, R.id.b37, R.id.b38, R.id.b39,
R.id.b40, R.id.b41, R.id.b42, R.id.b43, R.id.b44, R.id.b45, R.id.b46, R.id.b47,
R.id.b48, R.id.b49, R.id.b50, R.id.b51, R.id.b52, R.id.b53, R.id.b54, R.id.b55,
R.id.b56, R.id.b57, R.id.b58, R.id.b59, R.id.b60, R.id.b61, R.id.b62, R.id.b63
};
bakdrawables = new int[]{R.drawable.vbbb1, R.drawable.vbbb2, R.drawable.vbbb3, R.drawable.vbbb4, R.drawable.vbbb5, R.drawable.vbbb6, R.drawable.vbbb7, R.drawable.vbbb8,
R.drawable.vbbb9, R.drawable.vbbb10, R.drawable.vbbb11, R.drawable.vbbb12, R.drawable.vbbb13, R.drawable.vbbb14, R.drawable.vbbb15, R.drawable.vbbb16,
R.drawable.vbbb17, R.drawable.vbbb18, R.drawable.vbbb19, R.drawable.vbbb20, R.drawable.vbbb21, R.drawable.vbbb22, R.drawable.vbbb23, R.drawable.vbbb24,
R.drawable.vbbb25, R.drawable.vbbb26, R.drawable.vbbb27, R.drawable.vbbb28, R.drawable.vbbb29, R.drawable.vbbb30, R.drawable.vbbb31, R.drawable.vbbb32
};
}else{
textViewIds = new int[]{R.id.b16, R.id.b17, R.id.b18, R.id.b19,
R.id.b20, R.id.b21, R.id.b22, R.id.b23,
R.id.b24, R.id.b25, R.id.b26, R.id.b27,
R.id.b28, R.id.b29, R.id.b30, R.id.b31
};
bakdrawables = new int[]{R.drawable.vbb1, R.drawable.vbb2, R.drawable.vbb3, R.drawable.vbb4, R.drawable.vbb5, R.drawable.vbb6, R.drawable.vbb7, R.drawable.vbb8,
R.drawable.vbb9, R.drawable.vbb10, R.drawable.vbb11, R.drawable.vbb12, R.drawable.vbb13, R.drawable.vbb14, R.drawable.vbb15, R.drawable.vbb16
};
}
for (int z = 0; z < aantalbakken; z++) {
String prefixbakdrawable = "vbb";
if(aantalbakken == 32){
prefixbakdrawable = "vbbb";
}
Integer inhoudBak = Integer.parseInt(json.getString("b" + z));
if (inhoudBak > 0) {
((TextView) findViewById(textViewIds[z])).setText(inhoudBak.toString());
((TextView) findViewById(textViewIds[z])).setTextColor(Color.WHITE);
findViewById(textViewIds[z]).setBackgroundResource(bakdrawables[z]);
} else {
((TextView) findViewById(textViewIds[z])).setText(" ");
}
}
totaal = json.getString("totaal");
totaalText.setText(totaal);
inhoud = json.getString("inhoud");
inhoudText.setText(inhoud);
prev = json.getString("prev");
next = json.getString("next");
pijl = json.getString("pijl");
if(pijl.equals("left")){
locatieText.setBackgroundResource(R.drawable.left);
}
totaalditpad = json.getString("totaalditpad");
ditpadText.setText(totaalditpad);
if (sorteerObj.has("bakken")) {
bakken = sorteerObj.getJSONArray("bakken");
}
} catch (JSONException e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
e.printStackTrace();
}
} catch (JSONException e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
String stacktrace = sw.toString();
writeExceptionToFile(stacktrace);
e.printStackTrace();
}
}
}
public static Bitmap decodeFile(File f,int WIDTH,int HIGHT){
try {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
final int REQUIRED_WIDTH=WIDTH;
final int REQUIRED_HIGHT=HIGHT;
int scale=1;
while(o.outWidth/scale/2>=REQUIRED_WIDTH && o.outHeight/scale/2>=REQUIRED_HIGHT)
scale*=2;
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}
public void probeerOpnieuw (View v){
loadAgain("ja");
}
public void loadAgain(String doorgaan) {
Intent intent = new Intent(this, LoadRaaplijstActivity.class);
Bundle extras = new Bundle();
extras.putString("load", deze);
extras.putString("spinneridSelected", batch);
extras.putString("spinnerkarSelected", kar);
extras.putString("spinnerraperSelected", raper);
extras.putString("radioAfmakenSelected", doorgaan);
extras.putIntegerArrayList("gehadArray", gehadArray);
intent.putExtras(extras);
startActivity(intent);
finish();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_load_raaplijst, menu);
this.menu = menu;
String headerTxtTxt = "Batch: " + batch + "- Kar: " + kar + "- Raper: " + raper;
Runtime runtime = Runtime.getRuntime();
long maxMemory=runtime.maxMemory() / (1024 * 1024);
long usedMemory=(runtime.totalMemory() / (1024 * 1024)) - (runtime.freeMemory() / (1024 * 1024));
if(!Config.DEBUG.equals("")) headerTxtTxt = headerTxtTxt + " MaxMem:" + maxMemory + "Mb CurMem:" + usedMemory;
setTitle(headerTxtTxt);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.stopraaplijst:
Intent intent = new Intent(this, MainActivity.class);
Bundle extras = new Bundle();
intent.putExtras(extras);
startActivity(intent);
finish();
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
super.onKeyDown(keyCode, event);
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_DOWN:
loadAgain(radioAfmakenSelected);
return true;
case KeyEvent.KEYCODE_VOLUME_UP:
loadRaaplijstPrev();
return true;
case KeyEvent.KEYCODE_ENTER:
loadRaaplijstNext();
return true;
default:
return true;
}
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
super.onKeyDown(keyCode, event);
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_DOWN:
case KeyEvent.KEYCODE_BACK:
case KeyEvent.KEYCODE_VOLUME_UP:
case KeyEvent.KEYCODE_ENTER:
return true;
default:
return true;
}
}
@Override
public void onDestroy() {
super.onDestroy();
}
private void writeExceptionToFile(String exception){
File root = android.os.Environment.getExternalStorageDirectory();
String currentDateTimeString = DateFormat.getDateTimeInstance().format(
new Date());
File dir = new File(root.getAbsolutePath() + "/Lograaplijst");
if (!dir.exists()) {
dir.mkdirs();
}
Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd_HHmmss");
String formattedDate = df.format(c.getTime());
File file = new File(dir, "log_h_" + formattedDate + "_" + batch + "_" + kar + ".txt");
try {
BufferedWriter buf = new BufferedWriter(new FileWriter(file, true));
buf.append(currentDateTimeString + ":" + exception.toString());
buf.newLine();
buf.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}