画像ビットマップを設定した後にAndroidアプリがフリーズする

Question

私は背景画像を持つアプリを開発中です。この画像は非常に大きいので、私はいくつかのコードを使って、アプリがメモリ不足にならない程度に小さいことを確認しています。しかし、ビットマップをImageViewに設定すると、フリーズしてフレームをスキップし始めます。私がボタンを押すと、何も起こりません、アニメーションやメソッドの実行はありません。ここに私のコードです：ここでは

package com.github.legosteen11.testing; 

import android.content.res.Resources; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.util.DisplayMetrics; 
import android.view.Display; 
import android.widget.ImageView; 

public class MainActivity extends AppCompatActivity { 

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

     ImageView mImg; 
     mImg = (ImageView) findViewById(R.id.backgroundImage); 
     Display display = getWindowManager().getDefaultDisplay(); 
     DisplayMetrics displaymetrics = new DisplayMetrics(); 
     getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); 
     int height = displaymetrics.heightPixels; 
     int width = displaymetrics.widthPixels; 
     mImg.setImageBitmap(decodeSampledBitmapFromResource(getResources(), R.drawable.background_1, width, height)); 
    } 

    public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, 
                 int reqWidth, int reqHeight) { 

     // First decode with inJustDecodeBounds=true to check dimensions 
     final BitmapFactory.Options options = new BitmapFactory.Options(); 
     options.inJustDecodeBounds = true; 
     BitmapFactory.decodeResource(res, resId, options); 

     // Calculate inSampleSize 
     options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); 

     // Decode bitmap with inSampleSize set 
     options.inJustDecodeBounds = false; 
     return BitmapFactory.decodeResource(res, resId, options); 
    } 

    public static int calculateInSampleSize(
      BitmapFactory.Options options, int reqWidth, int reqHeight) { 
     // Raw height and width of image 
     final int height = options.outHeight; 
     final int width = options.outWidth; 
     int inSampleSize = 1; 

     if (height > reqHeight || width > reqWidth) { 

      // Calculate ratios of height and width to requested height and width 
      final int heightRatio = Math.round((float) height/(float) reqHeight); 
      final int widthRatio = Math.round((float) width/(float) reqWidth); 

      // Choose the smallest ratio as inSampleSize value, this will guarantee 
      // a final image with both dimensions larger than or equal to the 
      // requested height and width. 
      inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio; 
     } 

     return inSampleSize; 
    } 
} 

は私のXMLです：

<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" 
    tools:context="com.github.legosteen11.testing.MainActivity"> 

    <ImageView 
     android:id="@+id/backgroundImage" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:scaleType="centerCrop" 
     android:src="@drawable/ic_launcher" /> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical" 
     android:layout_margin="16dp"> 

     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="0dp" 
      android:layout_weight="5" 
      android:textSize="45sp" 
      android:textAlignment="center" 
      android:text="Welcome!"/> 

     <TextView 
      android:layout_weight="0" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:textAlignment="center" 
      android:textSize="24sp" 
      android:text="How long will you be away?"/> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_weight="0" 
      android:layout_marginBottom="16dp"> 



      <TextView 
       android:id="@+id/amountDays" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerHorizontal="true" 
       android:textSize="56sp" 
       android:text="0" /> 

      <TextView 
       android:id="@+id/daysTextView" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_alignBottom="@id/amountDays" 
       android:text="days" 
       android:layout_toRightOf="@id/amountDays" 
       android:textSize="24sp" /> 

     </RelativeLayout> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content"> 

      <Button 
       android:id="@+id/continueDaysButton" 
       android:text="Continue" 
       android:layout_centerHorizontal="true" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:onClick="helloWorld"/> 

     </RelativeLayout> 


    </LinearLayout> 



</RelativeLayout> 

編集： logcat、ここでコメントにエラーが、おかげであり、それは:)

05-04 14:58:32.354 18034-18034/com.github.legosteen11.testing W/System: ClassLoader referenced unknown path: /data/app/com.github.legosteen11.testing-2/lib/arm64 
05-04 14:58:32.401 18034-18046/com.github.legosteen11.testing W/art: Suspending all threads took: 22.270ms 
05-04 14:58:32.403 18034-18046/com.github.legosteen11.testing I/art: Background sticky concurrent mark sweep GC freed 1969(115KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 19MB/19MB, paused 23.077ms total 41.996ms 
05-04 14:58:32.643 18034-18034/com.github.legosteen11.testing W/System: ClassLoader referenced unknown path: /data/app/com.github.legosteen11.testing-2/lib/arm64 
05-04 14:58:32.758 18034-18034/com.github.legosteen11.testing W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
05-04 14:58:33.695 18034-18095/com.github.legosteen11.testing D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true 
05-04 14:58:33.748 18034-18095/com.github.legosteen11.testing I/Adreno: QUALCOMM build     : 63c06b2, I8366cd0437 
                     Build Date      : 12/06/15 
                     OpenGL ES Shader Compiler Version: XE031.05.13.02 
                     Local Branch      : mybranch17112971 
                     Remote Branch     : quic/LA.BF64.1.2.9_v2 
                     Remote Branch     : NONE 
                     Reconstruct Branch    : NOTHING 
05-04 14:58:33.753 18034-18095/com.github.legosteen11.testing I/OpenGLRenderer: Initialized EGL, version 1.4 
05-04 14:58:35.205 18034-18034/com.github.legosteen11.testing I/Choreographer: Skipped 84 frames! The application may be doing too much work on its main thread. 
05-04 14:58:36.561 18034-18034/com.github.legosteen11.testing I/Choreographer: Skipped 80 frames! The application may be doing too much work on its main thread. 
05-04 14:58:37.956 18034-18034/com.github.legosteen11.testing I/Choreographer: Skipped 83 frames! The application may be doing too much work on its main thread. 

Answer 1

されていません別のスレッドでコードを実行するだけです これは異なるスレッドでロードされるため、UIには負荷がかかりません。
グローバル

としてのonCreateのこの外側を宣言し

ImageView mImg; 

    public class DownloadFromServer extends AsyncTask<String, Void, Bitmap> { 
      Context mContext; 

      public DownloadFromServer(Context context) { 
       mContext = context; 
      } 


      @Override 
      protected void onPostExecute(Bitmap s) { 
       super.onPostExecute(s); 
       mImg.setBitmap(s);    
      } 

      @Override 
      protected void onPreExecute() { 
       super.onPreExecute(); 

      } 

      @Override 
      protected ScData doInBackground(String... params) { 
       Bitmap bmp=decodeSampledBitmapFromResource(getResources(), R.drawable.background_1, width, height); 
       return bmp; 
      } 
     }