我是looking at this answer over here,但它并没有真正解决我的问题。
由于某些原因,即使我删除了manifest.xml
文件夹,build
也不会覆盖我的更改。
我试图在屏幕上加载5张图片,但即使经过优化也是如此;他们仍然没有记忆。
我正在看video that teaches image scaling。它确实解决了我的一小部分问题。我能够加载我的背景图像,但是我无法加载我的其他4张图像。
如何更有效地进行优化?我正在观看此视频关于Bitmap optimization by Android,但我对此并不了解。
这是我的源代码
MainActivity.java
package com.example.cliente.myapplication;
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.widget.ImageView;
public class MainActivity extends AppCompatActivity {
private static final float BYTES_PER_PX = 4.0f;
ImageView backgroundImage, upImage, downImage, leftImage, alertImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
backgroundImage = findViewById(R.id.background_image);
loadImage(backgroundImage, R.drawable.background);
upImage = findViewById(R.id.up_arrow_image);
loadImage(upImage, R.drawable.up);
downImage = findViewById(R.id.down_arrow_image);
loadImage(downImage, R.drawable.down);
leftImage = findViewById(R.id.left_arrow_image);
loadImage(leftImage, R.drawable.left);
alertImage = findViewById(R.id.alert_image);
loadImage(alertImage, R.drawable.alert);
}
private void loadImage(ImageView image, int imgSrc) {
if (readBitmapInfo() > MemUtils.megabytesFree()) {
subSampleImage(image, 32);
} else {
image.setImageResource(imgSrc);
}
}
private float readBitmapInfo() {
final Resources res = this.getResources();
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, R.drawable.background, options);
final float imageHeight = options.outHeight;
final float imageWidth = options.outWidth;
return imageWidth * imageHeight * BYTES_PER_PX / MemUtils.BYTES_IN_MB;
}
private void subSampleImage(ImageView image, int powerOf2) {
if (powerOf2 < 1 || powerOf2 > 2) {
return;
}
final Resources res = this.getResources();
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = false;
options.inSampleSize = powerOf2;
final Bitmap map = BitmapFactory.decodeResource(res, R.drawable.background, options);
image.setImageBitmap(map);
}
}
MemUtils.java
package com.example.cliente.myapplication;
public class MemUtils {
public static final float BYTES_IN_MB = 1024.0f * 1024.0f;
public static float megabytesFree() {
final Runtime rt = Runtime.getRuntime();
final float bytesUsed = rt.totalMemory();
final float mbUsed = bytesUsed / BYTES_IN_MB;
final float mbFree = megabytesAvailable() - mbUsed;
return mbFree;
}
public static float megabytesAvailable() {
final Runtime rt = Runtime.getRuntime();
final float bytesAvailable = rt.maxMemory();
return bytesAvailable / BYTES_IN_MB;
}
}
答案 0 :(得分:0)
所以我开始时有 2个错误。
Picasso
的库来解决我的问题。Canvas: trying to draw too large...
问题。我需要将图片从drawable-mdpi
移至drawable-xxhdpi
。以下是我的问题的解决方案:
package com.example.cliente.myapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
public class MainActivity extends AppCompatActivity {
ImageView backgroundImage, upImage, downImage, leftImage, alertImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
backgroundImage = findViewById(R.id.background_image);
Picasso.get().load(R.drawable.background).into(backgroundImage);
upImage = findViewById(R.id.up_arrow_image);
Picasso.get().load(R.drawable.up).into(upImage);
downImage = findViewById(R.id.down_arrow_image);
Picasso.get().load(R.drawable.down).into(downImage);
leftImage = findViewById(R.id.left_arrow_image);
Picasso.get().load(R.drawable.left).into(leftImage);
alertImage = findViewById(R.id.alert_image);
Picasso.get().load(R.drawable.alert).into(alertImage);
}
}