我试图检索视图的位图，实质上是截图。我目前的实施如下：
public Bitmap loadBitmapFromView(View v)
{
Bitmap b = Bitmap.createBitmap(v.getHeight(), v.getWidth(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
v.layout(0, 0, v.getLayoutParams().width, v.getLayoutParams().height);
v.draw(c);
return b;
}
然而，出于某种原因，我在检索整个视图时遇到了一些问题。结果图像被裁剪，一些部分被切掉。起初，我认为这是布局设置的问题，因为我已将宽度设置为fill_parent，但当我将其设置为300dp时问题仍然存在。
答案 0 :(得分：0)
我的贡献 - ＆gt;
[ACTIVITY MAIN]
//ADD PACKAGE HERE
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
/**
* ShootAndCropActivity demonstrates capturing and cropping camera images
* - user presses button to capture an image using the device camera
* - when they return with the captured image Uri, the app launches the crop action intent
* - on returning from the crop action, the app displays the cropped image
*
* Sue Smith
* Mobiletuts+ Tutorial: Capturing and Cropping an Image with the Android Camera
* July 2012
*
*/
public class ShootAndCropActivity extends Activity implements OnClickListener {
//keep track of camera capture intent
final int CAMERA_CAPTURE = 1;
//keep track of cropping intent
final int PIC_CROP = 2;
//captured picture uri
private Uri picUri;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//retrieve a reference to the UI button
Button captureBtn = (Button)findViewById(R.id.capture_btn);
//handle button clicks
captureBtn.setOnClickListener(this);
}
/**
* Click method to handle user pressing button to launch camera
*/
public void onClick(View v) {
if (v.getId() == R.id.capture_btn) {
try {
//use standard intent to capture an image
Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//we will handle the returned data in onActivityResult
startActivityForResult(captureIntent, CAMERA_CAPTURE);
}
catch(ActivityNotFoundException anfe){
//display an error message
String errorMessage = "Whoops - your device doesn't support capturing images!";
Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
toast.show();
}
}
}
/**
* Handle user returning from both capturing and cropping the image
*/
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
//user is returning from capturing an image using the camera
if(requestCode == CAMERA_CAPTURE){
//get the Uri for the captured image
picUri = data.getData();
//carry out the crop operation
performCrop();
}
//user is returning from cropping the image
else if(requestCode == PIC_CROP){
//get the returned data
Bundle extras = data.getExtras();
//get the cropped bitmap
Bitmap thePic = extras.getParcelable("data");
//retrieve a reference to the ImageView
ImageView picView = (ImageView)findViewById(R.id.picture);
//display the returned cropped image
picView.setImageBitmap(thePic);
}
}
}
/**
* Helper method to carry out crop operation
*/
private void performCrop(){
//take care of exceptions
try {
//call the standard crop action intent (the user device may not support it)
Intent cropIntent = new Intent("com.android.camera.action.CROP");
//indicate image type and Uri
cropIntent.setDataAndType(picUri, "image/*");
//set crop properties
cropIntent.putExtra("crop", "true");
//indicate aspect of desired crop
cropIntent.putExtra("aspectX", 1);
cropIntent.putExtra("aspectY", 1);
//indicate output X and Y
cropIntent.putExtra("outputX", 256);
cropIntent.putExtra("outputY", 256);
//retrieve data on return
cropIntent.putExtra("return-data", true);
//start the activity - we handle returning in onActivityResult
startActivityForResult(cropIntent, PIC_CROP);
}
//respond to users whose devices do not support the crop action
catch(ActivityNotFoundException anfe){
//display an error message
String errorMessage = "Whoops - your device doesn't support the crop action!";
Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
toast.show();
}
}
}
[main.xml中]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/intro"
android:layout_margin="3dp"
android:textStyle="bold" />
<Button
android:id="@+id/capture_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/capture"
/>
<ImageView
android:id="@+id/picture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/picture"
android:layout_margin="5dp"
android:background="@drawable/pic_border" />
</LinearLayout>