暗戰與照片內存 - 更新

Question

我是新來的Android和拍圖片應用程序，但我在那裏我跑出來的內存問題。

主要活性是啓動其具有視圖尋呼機相片滑塊新的活動，表現出5ish照片按鈕的網格。目前它正在運行，但是在返回到主屏幕並選擇一個新按鈕（該按鈕開始一個新的照片活動）之後，它變得比崩潰慢。

看完監視器後，每次活動開始時都分配內存，但按下後退按鈕時內存不會被釋放。

我知道人們建議使用滑行庫，但我爲每個活動運行5個小尺寸照片，並且如果可以在不再需要活動時釋放內存，那麼我當前的設置應該可以工作。

我知道我這樣做的方式並不是最好的方法，但我只是想盡快讓它工作，然後我可以回去優化它。

哪裏是內存泄漏或我的錯誤？

建議？

在此先感謝。

public class MainActivity extends AppCompatActivity { 

static int picSet = 1; //the set of pictures i want 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
} 

public void startActiv() 
{ 
    startActivity(new Intent(MainActivity.this, PagerSetUp.class)); 
} 

//Button/Image 
public void firstMet(View view) { 
    picSet = 1; 
    startActiv(); 
} 
//Button/Image 
public void wedding (View view) { 
    picSet = 2; 
    startActiv(); 
} 
//Button/Image 
public void vacation(View view) { 
    picSet = 3; 
    startActiv(); 
} 
//Button/Image 
public void pups (View view) { 
    picSet = 4; 
    startActiv(); 
} 
//Button/Image 
public void ourHomes(View view) { 
    picSet = 5; 
    startActiv(); 
} 
//Button/Image 
public void age (View view) { 
    picSet = 6; 
    startActiv(); 
} 
//Button/Image 
public void family(View view) { 
    picSet = 7; 
    startActiv(); 
} 
//Button/Image 
public void friends (View view) { 
    picSet = 8; 
    startActiv(); 
} 
} 

public class PagerSetUp extends AppCompatActivity { 

//Create an instance of the pager adapter class 
CustomPagerAdapter mCustomPagerAdapter; //Creates content for each page 

//Create an instance of the view pager class 
ViewPager mViewPager; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.collections_main); //XML File 

    //Setting up the ViewPager 
    mCustomPagerAdapter = new CustomPagerAdapter(this); 

    mViewPager = (ViewPager) findViewById(R.id.pager); 
    mViewPager.setAdapter(mCustomPagerAdapter); 
} 
} 

public class CustomPagerAdapter extends PagerAdapter { 

public int[] firstMetPics = { 
     R.drawable.fm1, 
     R.drawable.fm2, 
     R.drawable.fm3, 
     R.drawable.fm4, 
     R.drawable.fm5 
}; 

public int[] weddingPics = { 
     R.drawable.w1, 
     R.drawable.w2, 
     R.drawable.w3, 
     R.drawable.w4, 
     R.drawable.w5 
}; 

public int[] vacationPics = { 
     R.drawable.fm1, 
     R.drawable.fm2, 
     R.drawable.fm3, 
     R.drawable.fm4, 
     R.drawable.fm5 
}; 

public int[] pupsPics = { 
     R.drawable.fm1, 
     R.drawable.fm2, 
     R.drawable.fm3, 
     R.drawable.fm4, 
     R.drawable.fm5 
}; 

public int[] homesPics = { 
     R.drawable.fm1, 
     R.drawable.fm2, 
     R.drawable.fm3, 
     R.drawable.fm4, 
     R.drawable.fm5 
}; 

public int[] agePics = { 
     R.drawable.fm1, 
     R.drawable.fm2, 
     R.drawable.fm3, 
     R.drawable.fm4, 
     R.drawable.fm5 
}; 

public int[] familyPics = { 
     R.drawable.fm1, 
     R.drawable.fm2, 
     R.drawable.fm3, 
     R.drawable.fm4, 
     R.drawable.fm5 
}; 

public int[] friendsPics = { 
     R.drawable.fm1, 
     R.drawable.fm2, 
     R.drawable.fm3, 
     R.drawable.fm4, 
     R.drawable.fm5 
}; 

protected Context mContext; 
LayoutInflater mLayoutInflater; 

public CustomPagerAdapter(Context context) { 

    mContext = context; 
    mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 

//Specifies how many views to show in the ViewPager 
@Override 
public int getCount() { 

    int picArrayLength = 0; 

    switch (MainActivity.picSet) { 
     case 1: picArrayLength = firstMetPics.length; 
       break; 
     case 2: picArrayLength = weddingPics.length; 
       break; 
     case 3: picArrayLength = vacationPics.length; 
       break; 
     case 4: picArrayLength = pupsPics.length; 
       break; 
     case 5: picArrayLength = homesPics.length; 
       break; 
     case 6: picArrayLength = agePics.length; 
       break; 
     case 7: picArrayLength = familyPics.length; 
       break; 
     case 8: picArrayLength = friendsPics.length; 
       break; 
     default: picArrayLength = firstMetPics.length; 
       break; 
    } 
    return picArrayLength; 
} 

@Override 
public boolean isViewFromObject(View view, Object object) { 
    return view ==(object); 
} 

@Override 
public Object instantiateItem(ViewGroup container, int position) { 
    View itemView = mLayoutInflater.inflate(R.layout.pager_item, container, false); 

    ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView); 

    switch (MainActivity.picSet) { 
     case 1: imageView.setImageResource(firstMetPics[position]); 
       break; 
     case 2: imageView.setImageResource(weddingPics[position]); 
       break; 
     case 3: imageView.setImageResource(vacationPics[position]); 
       break; 
     case 4: imageView.setImageResource(pupsPics[position]); 
       break; 
     case 5: imageView.setImageResource(homesPics[position]); 
       break; 
     case 6: imageView.setImageResource(agePics[position]); 
       break; 
     case 7: imageView.setImageResource(familyPics[position]); 
       break; 
     case 8: imageView.setImageResource(friendsPics[position]); 
       break; 
     default: imageView.setImageResource(firstMetPics[position]); 
       break; 
    } 
    container.addView(itemView); 

    return itemView; 
} 

@Override 
public void destroyItem(ViewGroup container, int position, Object object) { 
    container.removeView((LinearLayout) object); 
    Log.i("NOTE", "destroyed view"); 
} 

Answer 1

OutOfMemory問題是由於幾個問題。對於你的情況，我猜是因爲圖像的大小和圖像的數量。您可以通過執行以下操作來消除此問題。

• 如果這些可繪製圖標是圖標？使用矢量繪製而不是普通的PNG。
• 在添加到可繪製文件夾之前壓縮圖像。
• 將您的PNG或JPG圖像格式WebP的。由於Android現在支持webP WebP。它會顯着縮小圖像尺寸。
• 最重要的是不要使用正常setImageDrawable或任何方法設置的圖像繪製。使用像畢加索，滑翔，壁畫等圖像加載庫加載圖像可繪製到ImageView。它肯定會避免outOfMemory問題。

希望這會幫助你克服你的問題。如果你仍然有問題，請讓我知道。 :)所有的