这是与这个问题有关的
java.lang.OutOfMemoryError at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
我创建了有问题的转储文件..它提供以下信息
One instance of "byte[]" loaded by "<system class loader>" occupies 1,10,59,216 (51.02%) bytes. The memory is accumulated in one instance of "byte[]" loaded by "<system class loader>". Keywords byte[]
那么现在可以做什么呢？我如何清除问题？
我的list_objects [context] -inbound文件
CLASS NAME SHALLOW HEAP RETAINED HEAP byte[11059200] @ 0xb4979590 | 1,216 | 1,216 mBuffer android.graphics.Bitmap @ 0xb3dc68d8 |48 | 48 mBitmap android.graphics.drawable.BitmapDrawable @ 0xb3dbba60 | 72 | 144 mBackground android.widget.RelativeLayout @ 0xb3db3fc0 |512 | 10,144 mBitmap android.graphics.drawable.BitmapDrawable$BitmapState @ 0xb3dc0068 |40 | 40 mBitmapState android.graphics.drawable.BitmapDrawable @ 0xb3dbba60 |72 | 144 referent java.lang.ref.WeakReference @ 0xb3dc2d68 |24 | 24
请帮助我绝望我如何解决内存问题？
我的home_screen.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home_page);
main();
private void main() {
// TODO Auto-generated method stub
final Button home;
final Button aboutus;
final Button contacts;
final Button clients;
final Button services;
try
{
home = (Button)findViewById(R.id.btnHome);
aboutus = (Button)findViewById(R.id.btnAboutus);
clients = (Button)findViewById(R.id.btnClients);
contacts = (Button)findViewById(R.id.btnContacts);
services = (Button)findViewById(R.id.btnServices);
home.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.home1);
Drawable d = new BitmapDrawable(getResources(),b);
home.setBackgroundDrawable(d);
System.gc();
Intent myIntent = new Intent(Home_Screen.this,Button_Anime.class);
startActivity(myIntent);
}
});
aboutus.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.about1 );
Drawable d = new BitmapDrawable(getResources(),b);
aboutus.setBackgroundDrawable(d);
Intent myIntent = new Intent(Home_Screen.this,AboutUs.class);
startActivity(myIntent);
}
});
clients.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.clients1 );
Drawable d = new BitmapDrawable(getResources(),b);
clients.setBackgroundDrawable(d);
Intent myIntent = new Intent(Home_Screen.this,Clients.class);
startActivity(myIntent);
}
});
contacts.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.contact1);
Drawable d = new BitmapDrawable(getResources(),b);
contacts.setBackgroundDrawable(d);
Intent myIntent = new Intent(Home_Screen.this,Contacts.class);
startActivity(myIntent);
}
});
services.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Bitmap b = BitmapFactory.decodeResource(getResources(),R.drawable.services1 );
Drawable d = new BitmapDrawable(getResources(),b);
services.setBackgroundDrawable(d);
Intent myIntent = new Intent(Home_Screen.this,Services.class);
startActivity(myIntent);
}
});
}
catch(Exception e)
{
e.printStackTrace();
}
}
解决方法
这个想法是缩小您的图像,使其在较小的屏幕上看起来不错,而且您不必在内存中加载整个位图.
1)首先得到您将要显示的ImageView /屏幕的大小.
2)通过传递BitmapFactory.Options.inJustDecodeBounds来读取Bitmap的大小.这将为您提供Bitmap的大小,而不是加载整个位图.
3)获取采样大小.计算屏幕的高度和宽度与图像高度和宽度的比率.使用最小的一个,使最大的尺寸看起来不错.
2)(代码)
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options(); bitmapOptions.inJustDecodeBounds = true; BitmapFactory.decodeStream(inputStream,null,bitmapOptions); int imageWidth = bitmapOptions.outWidth; int imageHeight = bitmapOptions.outHeight; inputStream.close();
4)(代码)
private Bitmap downscaleBitmapUsingDensities(final int sampleSize,final int imageResId)
{
final Options bitmapOptions=new Options();
bitmapOptions.inDensity=sampleSize;
bitmapOptions.inTargetDensity=1;
final Bitmap scaledBitmap=BitmapFactory.decodeResource(getResources(),imageResId,bitmapOptions);
scaledBitmap.setDensity(Bitmap.DENSITY_NONE);
return scaledBitmap;
}
