我从用户图库中挑选了一张图像。我还有一个生成自定义编辑文本的按钮，我可以在相对布局周围拖动其值。这部分代码工作正常，但我想知道是否有一种方法可以创建一个位图，捕获屏幕，就像从用户图库中选取该图像、编辑文本值和图像未覆盖的布局的其他部分(我使用中心裁剪比例类型)一样。 正如您在我的 SendToDb 方法中看到的，我已经尝试使用 createBitmap 但这返回一个空值，只是一个空的屏幕布局，既没有图像也没有编辑文本值。关于如何获得包含图像和编辑文本的新位图有什么帮助吗？任何帮助，将不胜感激。谢谢! Here is a screenshot of the final bitmap I'd like to have. Thanks in advance!
这是我的 xml 代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:background="@color/white"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CanvasTestActivity">
<RelativeLayout
android:id="@+id/imgv"
android:layout_above="@+id/post"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<ImageButton
android:id="@+id/select"
android:layout_width="match_parent"
android:layout_height="350dp"
android:scaleType="centerCrop"
android:layout_alignParentStart="true"
android:layout_centerVertical="true" />
<RelativeLayout
android:id="@+id/drag"
android:visibility="invisible"
android:layout_width="match_parent"
android:layout_height="match_parent">
</RelativeLayout>
<ImageButton
android:id="@+id/editshow"
android:visibility="invisible"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="11dp"
android:layout_marginTop="200dp"
android:src="@drawable/ic_bio" />
<Button
android:id="@+id/post"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:background="@color/white"
android:text="Post" />
</RelativeLayout>
在 Activity 中
public class CanvasTestActivity extends AppCompatActivity {
private Button Post;
private ImageButton selectStory, showet;
private RelativeLayout mLayout;
private EditText userInput;
private String currentUserId, caption, msg;
private DatabaseReference PostsRef;
private StorageReference TestPostStorage;
private RelativeLayout dragLayout;
RelativeLayout.LayoutParams params;
private Uri imageUri;
Bitmap bm;
Boolean clicked = false;
private final static int Gall_pick = 67;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_canvas_test);
currentUserId = FirebaseAuth.getInstance().getCurrentUser().getUid();
mLayout = findViewById(R.id.imgv);
Post = findViewById(R.id.post);
selectStory = findViewById(R.id.select);
showet = findViewById(R.id.editshow);
showet.setVisibility(View.VISIBLE);
dragLayout = findViewById(R.id.drag);
dragLayout.setOnDragListener(new MyDragListener());
dragLayout.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()){
case MotionEvent.ACTION_DOWN:
int x = (int) motionEvent.getX();
int y = (int) motionEvent.getY();
break;
case MotionEvent.ACTION_MOVE:
x = (int) motionEvent.getX();
y = (int) motionEvent.getY();
break;
}
return true;
}
});
PostsRef = FirebaseDatabase.getInstance().getReference().child("CanvasTestPosts");
TestPostStorage = FirebaseStorage.getInstance().getReference().child("CTPStorage");
selectStory.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
OpenGallere();
}
});
showet.setOnClickListener(new MyButtonClickListener());
Post.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SendToDb();
}
});
}
public class CustomEdittext extends android.support.v7.widget.AppCompatEditText
{
Paint paint;
public CustomEdittext(Context context){
super(context);
init();
}
public CustomEdittext(Context context, AttributeSet attr){
super(context, attr);
init();
}
public void init(){
paint = new Paint();
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(4);
paint.setTextSize(22);
paint.setColor(Color.WHITE);
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
canvas.drawRect(0, 0, getWidth(), getHeight(), paint);
}
}
public class MyDragListener implements View.OnDragListener
{
private RelativeLayout.LayoutParams params;
@Override
public boolean onDrag(View v, DragEvent event)
{
View view = (View) event.getLocalState();
switch(event.getAction())
{
case DragEvent.ACTION_DRAG_STARTED:
params = (RelativeLayout.LayoutParams) view.getLayoutParams();
break;
case DragEvent.ACTION_DRAG_ENTERED:
int x = (int) event.getX();
int y = (int) event.getY();
break;
case DragEvent.ACTION_DRAG_EXITED :
break;
case DragEvent.ACTION_DRAG_LOCATION :
x= (int) event.getX();
y = (int) event.getY();
break;
case DragEvent.ACTION_DRAG_ENDED :
break;
case DragEvent.ACTION_DROP:
x = (int) event.getX();
y = (int) event.getY();
params.leftMargin = x;
params.topMargin = y;
view.setLayoutParams(params);
view.setVisibility(View.VISIBLE);
break;
default: break;
}
return true;
}
}
private void SendToDb() {
final String key = PostsRef.push().getKey();
StorageReference filePath = TestPostStorage.child(key);
Bitmap returnedBitmap = Bitmap.createBitmap(mLayout.getWidth(), mLayout.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(returnedBitmap);
Drawable bgDrawable = mLayout.getBackground();
if (bgDrawable != null){
bgDrawable.draw(canvas);
} else {
canvas.drawColor(Color.WHITE);
mLayout.draw(canvas);
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
returnedBitmap.compress(Bitmap.CompressFormat.JPEG, 20, baos);
byte[] dataToUpload = baos.toByteArray();
UploadTask uploadTask = filePath.putBytes(dataToUpload);
uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Uri imageUrl = taskSnapshot.getDownloadUrl();
finish();
return;
}
});
}
private void OpenGallere() {
Intent gIntent = new Intent();
gIntent.setAction(Intent.ACTION_GET_CONTENT);
gIntent.setType("image/*");
startActivityForResult(gIntent, Gall_pick);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == Gall_pick && resultCode == RESULT_OK && data != null){
imageUri = data.getData();
try {
bm = MediaStore.Images.Media.getBitmap(getContentResolver(), imageUri);
selectStory.setImageBitmap(bm);
} catch (IOException e){
e.printStackTrace();
}
showet.setVisibility(View.VISIBLE);
dragLayout.setVisibility(View.VISIBLE);
}
}
private class MyLongClickListener implements View.OnLongClickListener {
@Override
public boolean onLongClick(View v)
{
ClipData dragdata = ClipData.newPlainText("","");
View.DragShadowBuilder shdwbldr = new View.DragShadowBuilder(v);
v.startDrag(dragdata, shdwbldr, v, 0);
v.setVisibility(View.INVISIBLE);
return true;
}
}
private class MyButtonClickListener implements View.OnClickListener {
@Override
public void onClick(View view) {
ViewGroup rp = (ViewGroup)view.getParent();
CustomEdittext edttext = new CustomEdittext(view.getContext());
rp.addView(edttext);
edttext.setOnLongClickListener(new MyLongClickListener() );
}
}
}
最佳答案
如果要将多个 View 绘制到位图上，请调用包含所有 View 的父 View 组的draw方法。
关于java - 如何将多个 View 合并到一张位图中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55441593/