我尝试将代码中的TextView添加到framelayout。它位于framelayout的z顺序的imageview上方。最终目标是允许从framelayout创建一个屏幕截图，显示图像和已叠加到其上的文本。我使用在xml中创建的textview但在动态代码版本中没有这个工作。创建位图方法返回一个错误，抱怨文本框的宽度为0.在下面的代码中，我试图仅将textview捕获为图像以识别问题是什么，因为来自framelayout的捕获图像不包含textview的内容如预期。在这样做我能够找到宽度错误，我相信这是问题的根源。我试图使用setWidth设置textview的宽度，并使用LayoutParams。最终的结果始终是textview没有宽度，尽管它可以清楚地在手机上看到。我想我在动态创建和现有xml之间缺少一些导致0宽度的东西。有人能指出我正确的方向吗？
代码如下
public void applyTextToImage(View view) {
// Do something in response to button
//Hide the virtual keyboard
InputMethodManager inputManager = (InputMethodManager) getSystemService(this.INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
//Get the text to overlay on the image
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
//Bring the overlay layout to the front
//LinearLayout overlay_layout = (LinearLayout) findViewById(R.id.image_Overlay_Layout);
//overlay_layout.bringToFront();
//Apply the new text to the text box
/* Old code to get the view that is shown in the layout
TextView text_overlay = (TextView) findViewById(R.id.image_Overlay);
text_overlay.bringToFront();
text_overlay.setText(message);
*/
//New code to create a view dynamically instead
TextView text_Overlay = new TextView(this);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
text_Overlay.setId(Utils.generateViewId());
}
else
{
text_Overlay.setId(TextView.generateViewId()); //static class
}
FrameLayout image_Layout = (FrameLayout) findViewById(R.id.image_Layout);
//View image_Layout = (View) findViewById(R.id.image_Layout);
//FrameLayout.LayoutParams fParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,FrameLayout.LayoutParams.WRAP_CONTENT);
FrameLayout.LayoutParams fParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,FrameLayout.LayoutParams.WRAP_CONTENT);
fParams.gravity = Gravity.CENTER;
// text_Overlay.setMaxWidth(image_Layout.getWidth());
// text_Overlay.setWidth(image_Layout.getWidth());
//image_Layout.addView(text_Overlay, fParams);
image_Layout.addView(text_Overlay, fParams);
Toast.makeText(this,"TextView Width: " + text_Overlay.getWidth(),Toast.LENGTH_LONG).show();
//TODO: Something has forced the dynamic layout to not be saved in the bitmap try removing the params and set the values on the textview itself
//TODO: for some reason the width keeps coming back as 0 could be that the image_Layout is 0 too
text_Overlay.setGravity(Gravity.CENTER);
text_Overlay.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
float pixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics());
//text_Overlay.setWidth(250dp);
text_Overlay.setTextSize(pixels);
text_Overlay.setTextColor(Color.RED);
text_Overlay.bringToFront();
text_Overlay.setText(message);
text_Overlay.setVisibility(View.VISIBLE);
//End of new dynamic code
if (folderCheck()){
try {
String filePath = getFilePath();
int myId = text_Overlay.getId();
Bitmap bitmap;
View v1 = findViewById(myId);
v1.setDrawingCacheEnabled(true);
v1.buildDrawingCache();
bitmap = Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
// End imported code
streamBitmapToFile(bitmap, filePath);
}
catch (Exception e)
{
Toast.makeText(this,e.getMessage(),Toast.LENGTH_LONG);
Log.e("Bitmap Creation","Couldn't create bitmap error as: " + e.toString());
}
}
}
XML内容
<?xml version="1.0" encoding="utf-8"?>
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<LinearLayout 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:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="false">
<!--app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_my"-->
<EditText android:id="@+id/edit_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="@string/edit_message"
android:enabled="false"/>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_send"
android:onClick="applyTextToImage"
android:enabled="false"
android:id="@+id/overlayButton"/>
</LinearLayout>
<FrameLayout
android:id="@+id/image_Layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true">
<ImageView
android:id="@+id/image_View"
android:layout_width="match_parent"
android:layout_height="250dp" />
<!--<TextView
android:id="@+id/image_Overlay"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textAlignment="center"
android:textSize="25dp"
android:textColor="#ff0000"/>-->
</FrameLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="false"
android:gravity="bottom"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true">
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/open_gallery"
android:onClick="openGallery">
</Button>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/new_image"
android:onClick="newImage">
</Button>
</LinearLayout>
</RelativeLayout>
答案 0 :(得分：0)
该视图尚未测量。在系统执行另一个布局传递之前，视图会将其宽度报告为零。
在我看来，最好将TextView保留在XML布局中，只需将其隐藏（android:visibility="invisible"）直到需要它，然后使用setVisbility(View.VISIBLE)以逗号方式显示它。 （请注意，如果将其设置为gone，则也不会对其进行测量。）
答案 1 :(得分：0)
供参考，Karakuri指出了解决问题的弱点和路径。
为侦听器实现的额外代码如下。
IMAGE_CAPTURE_REQUESTED = true;
// New Listener
ViewTreeObserver vto = image_Layout.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
image_Layout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
else
{
image_Layout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
if (IMAGE_CAPTURE_REQUESTED) {
//int myId = text_Overlay.getId();
//Toast.makeText(MyActivity.this, "Text Overlay Width " + text_Overlay.getWidth() ,Toast.LENGTH_LONG).show();
overlayTextAndExportImage();
}
}
}); //End New Listener
新的overlayTextAndImportImage在重新绘制布局后调用所有图像创建例程。