我無法完全理解如何實現我想要的功能。我試圖從drawables文件夾中加載一個隨機圖像到圖像視圖。我通過抓取所有drawable的引用並將id放入int數組來完成此操作。我比隨機選擇一個介於零和最大數組長度之間的數字,並使用該圖像填充圖像視圖。Android內存不足錯誤,將圖像中的隨機圖像加載到一個圖像中查看
當我旋轉屏幕太多,而不是太多的隨機圖像已被加載到內存我猜測,因爲內存不足異常被拋出時,會出現問題。
我試圖回收使用後,但如果我再次拉回該圖像,我得到一個試圖重用再循環位圖錯誤。
問題活動
package com.example.hip_hoptrivia;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseArray;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class QuestionsActivity extends ActionBarActivity {
private JSONObject dataBase = null;
private JSONArray triviaQuestions = null;
private int currentQuestion = 0, currentDrawable;
//setup random question images
private int[] questionImages = new int[] {R.drawable.boswell_cheo_mural, R.drawable.buddha, R.drawable.dq,
R.drawable.equipment, R.drawable.graffiti, R.drawable.huge_image, R.drawable.rappers, R.drawable.spray_paint,
R.drawable.wza};
private static final String FILE_NAME = "questiondata.txt";
private static final String TAG_QUESTION = "Question";
private static final String TAG_ANSWER = "Answer";
private static final String TAG_INFO = "Info";
private static final String TAG_TRIVIA = "Trivia";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_questions);
createData();
createQuestion();
buttonSetup();
}
@Override
protected void onDestroy() {
super.onDestroy();
/* ImageView imageView = (ImageView)findViewById(R.id.randomImage);
Drawable drawable = imageView.getDrawable();
if (drawable instanceof BitmapDrawable) {
BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
Bitmap bitmap = bitmapDrawable.getBitmap();
bitmap.recycle();
bitmap = null;
}*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.questions, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
if(MyUtilities.NavigateActionItems(this , item))
return true;
else
return super.onOptionsItemSelected(item);
}
private void createData(){
String result = MyUtilities.parseLocalFile(this , FILE_NAME);
if(result != null){
try{
dataBase = new JSONObject(result);
triviaQuestions = dataBase.getJSONArray(TAG_TRIVIA);
}catch(JSONException e){
e.printStackTrace();
}
}else{
Log.e("Parsing", "coudln't extract");
}
}
private void createQuestion(){
try{
JSONObject s = triviaQuestions.getJSONObject(currentQuestion);
String question = s.getString(TAG_QUESTION);
//Clear Input Text
EditText userInputEditText = (EditText)findViewById(R.id.userInput);
userInputEditText.setText("");
//Place Question Text
TextView questionTextView = (TextView)findViewById(R.id.currentQuestion);
questionTextView.setText(question);
//Create random image that goes with text
ImageView randomImage = (ImageView)findViewById(R.id.randomImage);
//Random number such that [Min + (int)(Math.random() * ((Max - Min) + 1))]
currentDrawable = (int)(Math.random() * ((questionImages.length-1) + 1));
randomImage.setImageResource(questionImages[currentDrawable]);
}catch(JSONException e){
e.printStackTrace();
}
}
private void checkAnswer(){
try{
JSONObject s = triviaQuestions.getJSONObject(currentQuestion);
String answer = s.getString(TAG_ANSWER);
EditText userInputEditText = (EditText)findViewById(R.id.userInput);
String userAnswer = userInputEditText.getText().toString();
//check if input is correct
if(answer.equalsIgnoreCase(userAnswer)){
++currentQuestion;
createQuestion();
}else{
Toast.makeText(getApplicationContext(), "Wrong",
Toast.LENGTH_LONG).show();
}
}catch(JSONException e){
e.printStackTrace();
}
}
private void buttonSetup(){
Button submitButton = (Button) findViewById(R.id.submitButton);
submitButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//On input check if correct answer
checkAnswer();
}
});
}
}
佈局文件
<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="com.example.hip_hoptrivia.QuestionsActivity" >
<EditText
android:id="@+id/userInput"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="112dp"
android:ems="10" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/currentQuestion"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/userInput"
android:layout_centerHorizontal="true"
android:layout_marginBottom="115dp"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="@+id/submitButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/userInput"
android:layout_centerHorizontal="true"
android:layout_marginTop="48dp"
android:text="Submit" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/randomImage"
android:layout_above="@+id/currentQuestion"
android:layout_centerHorizontal="true" />
</RelativeLayout>
看來只是添加imageView.setImageDrawable(null)修復了問題。我認爲,它保持操作系統在切換時保持對圖像的引用,從而將其標記爲gc。非常感謝!我會認爲,通過將可引用的引用切換爲它會丟失對舊映像的引用。儘管如此,似乎你必須明確。 – 2014-09-06 08:09:04
你對gc的理解完全正確。如果此答案解決了您的問題,請單擊答案左側的「正確標記」接受答案。通過接受答案,它將幫助訪問此問題的任何其他人。 – 2014-09-06 15:00:00
因此,如果它解決了你的問題,永遠不要忘記接受答案。如果你真的很喜歡答案,你也可以通過點擊「UP」符號來提高答案。 – 2014-09-06 15:02:15