圖庫優化（Android）

Question

我如何優化當前的廚房視圖，因爲它使用大量內存，導致它滯後。我不知道用什麼來幫助防止滯後？無論如何，我會發布與它相關的所有代碼。 （我的圖片是每個約200kb，是.jpg格式）任何幫助非常感謝。

畫廊活動：

package kevin.erica.box; 
import kevin.erica.box.R.string; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.res.TypedArray; 
import android.os.Bundle; 
import android.util.DisplayMetrics; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup.MarginLayoutParams; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.Gallery; 
import android.widget.ImageButton; 
import android.widget.ImageView; 
import android.widget.TextView; 
public class App2Activity extends Activity { 
/** Called when the activity is first created. */ 
Context context = this; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.gallery); 

    final Button ibgb = (Button) findViewById(R.id.backgallery); 
    Gallery g = (Gallery) findViewById(R.id.gallery1); 
    DisplayMetrics metrics = new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(metrics); 
    MarginLayoutParams mlp = (MarginLayoutParams) g.getLayoutParams(); 
    mlp.setMargins((int) -(metrics.widthPixels/2), 
        mlp.topMargin, 
        mlp.rightMargin, 
        mlp.bottomMargin); 
    g.setAdapter(new ImageAdapter(this)); 
    ibgb.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View view) { 
      Intent intent = new Intent(); 
      setResult(RESULT_OK, intent); 
      finish(); 
     } 
     }); 




    g.setOnItemClickListener(new OnItemClickListener() { 



     public void onItemClick(@SuppressWarnings("rawtypes") AdapterView parent, View v, int position, long id) { 
      ImageView imageview = (ImageView) findViewById(R.id.ImageView01); 
      imageview.setImageResource(mImageIds[position]); 




     } 

    }); 
} 



public Integer[] mImageIds = { 
     R.drawable.alexbox, 
     R.drawable.arm, 
     R.drawable.mirror, 
     R.drawable.penstache, 
     R.drawable.penstache1, 
     R.drawable.glasses, 
     R.drawable.hatface, 
     R.drawable.rubber, 
     R.drawable.scarfballs, 
     R.drawable.drawing, 
     R.drawable.eastercardalex, 
     R.drawable.extralifenote, 
     R.drawable.mug1 


}; 



public class ImageAdapter extends BaseAdapter { 
int mGalleryItemBackground; 
private Context mContext; 

public ImageAdapter(Context c) { 
    mContext = c; 
    TypedArray a = obtainStyledAttributes(R.styleable.HelloGallery); 
    mGalleryItemBackground = a.getResourceId(
      R.styleable.HelloGallery_android_galleryItemBackground, 0); 
    a.recycle(); 
} 
public int getCount() { 
    return mImageIds.length; 
} 
public Object getItem(int position) { 
    return position; 
} 
public long getItemId(int position) { 
    return position; 
} 
public View getView(int position, View convertView, ViewGroup parent) { 
    ImageView i = new ImageView(mContext); 
    i.setImageResource(mImageIds[position]); 
    i.setLayoutParams(new Gallery.LayoutParams(170, 150)); 
    i.setScaleType(ImageView.ScaleType.FIT_XY); 
    i.setBackgroundResource(mGalleryItemBackground); 

    return i; 

} 
} 
} 

The.XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" > 



<Gallery 
    android:id="@+id/gallery1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" android:gravity="left"/> 





<ImageView 
    android:id="@+id/ImageView01" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/backgallery" 
    android:layout_below="@+id/gallery1" 
    android:layout_centerHorizontal="true" /> 

<Button 
    android:id="@+id/backgallery" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentRight="true" 
    android:text="Back" 
    android:clickable= "true" 
    android:onClick="gallerybackbutton"/> 

Answer 1

儘量提高你的適配器的getView()方法：

public View getView(int position, View convertView, ViewGroup parent) { 
    ImageView v; 
    if (convertView == null) { 
     v = new ImageView(mContext); 
    } else { 
     v = (ImageView) convertView; 
    } 
    v.setImageResource(mImageIds[position]); 
    v.setLayoutParams(new Gallery.LayoutParams(170, 150)); 
    v.setScaleType(ImageView.ScaleType.FIT_XY); 
    v.setBackgroundResource(mGalleryItemBackground); 
    return v; 
}