我正在创建一个用于交流学习的Android应用程序
我想在具有分页功能的活动中显示250张图像，但是当我从可绘制图像中获取图像时，它变成了错误OutOfMemoryError
也许我需要按系统调整图像大小，但我不知道该怎么做
当我尝试使用位图时，图像没有出现
在此代码中的适配器中发生
Drawable res = context.getResources().getDrawable(imageResource);
这是适配器
public class ContentAdapter extends BaseAdapter {
private Context context;
private List<Content> contents;
public ContentAdapter(Context context, List<Content> contents) {
this.context = context;
this.contents = contents;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
gridView = convertView;
// get layout from mobile.xml
gridView = inflater.inflate(R.layout.adapter_content, null);
// set value into textview
TextView textView = (TextView) gridView
.findViewById(R.id.grid_item_label);
textView.setText(contents.get(position).getTitle());
// set image based on selected text
ImageView imageView = (ImageView) gridView
.findViewById(R.id.grid_item_image);
try {
String uri = "@drawable/" + contents.get(position).getPathImage().split("\\.")[0];
Log.e("================", uri);
int imageResource = context.getResources().getIdentifier(uri, null, context.getPackageName());
Drawable res = context.getResources().getDrawable(imageResource); //error OOM in this line
imageView.setImageDrawable(res);
}
catch(Exception ex) {
File imgFile = new File(context.getFilesDir().getAbsolutePath() + "/img_content"
+ "/content_" + contents.get(position).getId() + ".jpg");
if(imgFile.exists()){
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath(),options);
imageView.setImageBitmap(myBitmap);
} else {
imageView.setImageResource(R.drawable.ic_menu_camera);
}
}
return gridView;
}
@Override
public int getCount() {
return contents.size();
}
@Override
public Object getItem(int position) {
return contents.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
}
这是Model
public class Content extends Base {
private int level;
private int themeId;
private int categoryId;
private String title;
private String pathImage;
private String pathSound;
private String level1;
public String getLevel1() {
return level1;
}
public void setLevel1(String level1) {
this.level1 = level1;
}
public int getLevel() {
return level;
}
public void setLevel(int level) {
this.level = level;
}
public int getThemeId() {
return themeId;
}
public void setThemeId(int themeId) {
this.themeId = themeId;
}
public int getCategoryId() {
return categoryId;
}
public void setCategoryId(int categoryId) {
this.categoryId = categoryId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getPathImage() {
return pathImage;
}
public void setPathImage(String pathImage) {
this.pathImage = pathImage;
}
public String getPathSound() {
return pathSound;
}
public void setPathSound(String pathSound) {
this.pathSound = pathSound;
}
@Override
public String toString() {
return "Content{" +
"categoryId=" + categoryId +
", title='" + title + '\'' +
", pathImage='" + pathImage + '\'' +
", pathSound='" + pathSound + '\'' +
'}';
}
}
并且，这是活动
public class BoardContentDialog extends Dialog {
private ListView lvFcmData;
private ContentDao contentDao;
private BoardInterface boardInterface;
private Context context;
private int categoryId;
private int level;
private int row;
private int col;
boolean isSemua = false;
boolean isSearch = false;
private String kategori;
private String kontenYangDicari;
List<Content> contents = null;
List<Content> contentSearch;
int halamanYangMuncul = 0;
public BoardContentDialog(@NonNull Context context, BoardInterface boardInterface, int categoryId,
int level, int row, int col) {
super(context);
this.context = context;
this.boardInterface = boardInterface;
this.categoryId = categoryId;
this.level = level;
this.row = row;
this.col = col;
}
public BoardContentDialog(@NonNull Context context, BoardInterface boardInterface, String kategori,
int level, int row, int col) {
super(context);
this.context = context;
this.boardInterface = boardInterface;
this.kategori = kategori;
this.isSemua = true;
this.level = level;
this.row = row;
this.col = col;
}
public BoardContentDialog(@NonNull Context context, BoardInterface boardInterface, String kontenYangDicari,
int level, int row, int col, boolean isSearch) {
super(context);
this.context = context;
this.boardInterface = boardInterface;
this.kontenYangDicari = kontenYangDicari;
this.isSearch = isSearch;
this.level = level;
this.row = row;
this.col = col;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.dialog_board_content);
contentDao = new ContentDao(context);
contentDao.open();
Button next = findViewById(R.id.BtnContentPageNext);
Button prev = findViewById(R.id.BtnContentPagePrev);
getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
findViewById(R.id.close).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
BoardContentDialog.this.dismiss();
}
});
if(isSemua == true){
contents = contentDao.getContentByCategory(kategori, level);
}else if(isSearch == true){
contents = contentDao.getContentBySearch(kontenYangDicari, level);
} else {
contents = contentDao.getContentByCategoryId(categoryId);
}
bindData(halamanYangMuncul);
prev.setEnabled(false);
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
halamanYangMuncul = halamanYangMuncul+1;
bindData(halamanYangMuncul);
toggleButtons();
}
});
prev.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
halamanYangMuncul = halamanYangMuncul-1;
bindData(halamanYangMuncul);
toggleButtons();
}
});
}
public int jumlahContent(){
return contents.size();
}
public int jumlahHalaman(){
int kontenTersisa = jumlahContent()%50;
if(kontenTersisa > 0){
return jumlahContent()/50;
}
return (jumlahContent()/50)-1;
}
public ArrayList<Content> contentsTersisa (int halamanSekarang){
int contentAwal = halamanSekarang*50;
int contentTerakhir = contentAwal+50;
ArrayList<Content> contentSekarang = new ArrayList<>();
try {
for (int i=0; i<jumlahContent(); i++){
if (i >= contentAwal && 1 < contentTerakhir){
contentSekarang.add(contents.get(i));
}
}
return contentSekarang;
}catch (Exception e){
e.printStackTrace();
return null;
}
}
private void toggleButtons(){
if (jumlahHalaman() <=1){
//kalo halaman cman 1
findViewById(R.id.BtnContentPageNext).setEnabled(false);
findViewById(R.id.BtnContentPagePrev).setEnabled(false);
} else if (halamanYangMuncul == jumlahHalaman()){
//halaman terakhir
findViewById(R.id.BtnContentPageNext).setEnabled(false);
findViewById(R.id.BtnContentPagePrev).setEnabled(true);
} else if (halamanYangMuncul == 0){
//halaman awal
findViewById(R.id.BtnContentPageNext).setEnabled(true);
findViewById(R.id.BtnContentPagePrev).setEnabled(false);
} else if (halamanYangMuncul >= 1 && halamanYangMuncul <= jumlahHalaman()){
//sisanya
findViewById(R.id.BtnContentPageNext).setEnabled(true);
findViewById(R.id.BtnContentPagePrev).setEnabled(true);
}
}
private void bindData (int halaman){
GridView gvContent = findViewById(R.id.content_list_grid);
gvContent.setAdapter(new ContentAdapter(context, contentsTersisa(halaman)));
gvContent.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
boardInterface.onBoardAdded(level, row, col, contents.get(position).getId());
BoardContentDialog.this.dismiss();
contentDao.close();
}
});
}
}
使用第三方库来加载图像并为您处理内存使用情况例如：Glide
替换
imageView.setImageDrawable(res)
使用
Glide.with(this).load(res).into(imageView);