将位图图像从一个活动传递到另一个活动 [英] pass a bitmap image from one activity to another
问题描述
在我的应用程序中，我将显示图库中的图片数量，只要我选择一张图片，图片就应该发送到新活动，在该活动中所选图片将被设置为背景.但是，我可以从图库中获取图像，但一旦我选择一个应用程序就会崩溃.提前致谢
In my app i am displaying no.of images from gallery from where as soon as I select one image , the image should be sent to the new activity where the selected image will be set as background.However, I am able to get the images from gallery but as soon as I select one the application crashes.Thanks in advance
Activity-1(图片显示在图库中，所选图片发送到新活动)
Activity-1(The images are shown in gallery and the selected image is sent to new activity)
public class Gallery extends Activity {
private static int RESULT_LOAD_IMAGE = 1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery);
Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadPicture);
buttonLoadImage.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
Intent i = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri contentUri = data.getData();
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String tmppath = cursor.getString(column_index);
Bitmap croppedImage = BitmapFactory.decodeFile(tmppath);
// Bitmap croppedImage = BitmapFactory.decodeFile(croppedImage);
Intent intent = new Intent(Gallery.this,GesturesActivity.class);
intent.putExtra("bmp",croppedImage);
startActivity(intent);
Log.v("sending image","sending image");
}
}
}
Activity-1(XML)
Activity-1(XML)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background"
>
<ImageView
android:id="@+id/imgView"
android:layout_width="fill_parent"
android:layout_weight="1" android:layout_height="wrap_content"></ImageView>
<Button
android:layout_height="wrap_content"
android:text="Load Picture"
android:layout_width="wrap_content"
android:id="@+id/buttonLoadPicture"
android:layout_weight="0"
android:layout_gravity="center"></Button>
</LinearLayout>
Activity-2(将选中的图片设置为屏幕背景图片的Activity)
Activity-2(The activity where the selected image should be set as background image of the screen)
public class GesturesActivity extends Activity {
private final int MENU_CAMERA = Menu.FIRST;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
Bitmap bmp = (Bitmap)this.getIntent().getParcelableExtra("bmp");
BitmapDrawable background = new BitmapDrawable(bmp);
getWindow().setBackgroundDrawable(background); //background image of the screen
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.advert);
View view = new SandboxView(this, bitmap);
setContentView(view);
}
public boolean onPrepareOptionsMenu(Menu menu) {
menu.clear();
menu.add(0, 11, 0, "Take Snapshot");
return super.onPrepareOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
}
推荐答案
有 3 个解决方案可以解决此问题.
There are 3 Solutions to solve this issue.
1) 首先将图像转换为字节数组，然后传入 Intent，在下一个活动中从 Bundle 中获取字节数组并转换为图像(位图)并设置为 ImageView.
1) First Convert Image into Byte Array and then pass into Intent and in next activity get byte array from Bundle and Convert into Image(Bitmap) and set into ImageView.
将位图转换为字节数组:-
Convert Bitmap to Byte Array:-
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
将字节数组传递给意图:-
Pass byte array into intent:-
Intent intent = new Intent(this, NextActivity.class);
intent.putExtra("picture", byteArray);
startActivity(intent);
从 Bundle 中获取字节数组并转换为位图图像:-
Get Byte Array from Bundle and Convert into Bitmap Image:-
Bundle extras = getIntent().getExtras();
byte[] byteArray = extras.getByteArray("picture");
Bitmap bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setImageBitmap(bmp);
2) 首先将图像保存到 SDCard 中，然后在下一个活动中将此图像设置为 ImageView.
2) First Save image into SDCard and in next activity set this image into ImageView.
3) 将 Bitmap 传递到 Intent 并从 bundle 中获取下一个活动中的位图，但问题是如果当时您的 Bitmap/Image 尺寸很大，则图像不会在下一个活动中加载.
3) Pass Bitmap into Intent and get bitmap in next activity from bundle, but the problem is if your Bitmap/Image size is big at that time the image is not load in next activity.
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