我知道这个问题被问了很多次，但没有一个答案真的对我有帮助。我正在尝试从图库中挑选一张图片，然后将整个视图转换为位图（拍摄快照）。它在大多数情况下都可以正常工作，但有时它显示运行时错误并使应用程序崩溃。我不明白为什么它会偶尔显示。
以下是我将视图转换为位图的 java 片段，它位于 onCreate() 内部，
save.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.i(TAG, "Saving...");
// bitmap
ContentValues cv = new ContentValues();
TextView name = (TextView) findViewById(R.id.name);
cv.put("victimname", name.getText().toString());
TextView gender = (TextView) findViewById(R.id.gender);
if (gender.getText().equals("MALE")) {
cv.put("gender", 1);
} else {
cv.put("gender", 0);
}
Button save = (Button) findViewById(R.id.save);
save.setVisibility(View.INVISIBLE);
ImageView bckground = (ImageView) findViewById(R.id.imageView1);
bckground.setImageResource(R.drawable.photocropscreenclearout);
View content = findViewById(R.id.rootView);
content.setDrawingCacheEnabled(true);
Bitmap bitmap = content.getDrawingCache();
// actual width of the image (img is a Bitmap object)
int width = bitmap.getWidth();
int height = bitmap.getHeight();
// new width / height
int newWidth = width / 2;
int newHeight = height / 2;
// calculate the scale
float scaleWidth = (float) newWidth / width;
float scaleHeight = (float) newHeight / height;
// create a matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// recreate the new Bitmap and set it back
bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height,
matrix, true);
Bitmap mb = bitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas c = new Canvas(mb);
// get the int for the colour which needs to be removed
Paint p = new Paint();
p.setARGB(255, 255, 255, 255); // ARGB for the color, in this
// case red
int removeColor = p.getColor(); // store this color's int for
// later use
p.setAlpha(0);
p.setXfermode(new AvoidXfermode(removeColor, 30,
AvoidXfermode.Mode.TARGET));
// draw transparent on the "brown" pixels
c.drawPaint(p);
ByteArrayOutputStream out = new ByteArrayOutputStream();
// bitmap.compress(Bitmap.CompressFormat.PNG, 100,out);
mb.compress(Bitmap.CompressFormat.PNG, 60, out);
cv.put("imageData", out.toByteArray());
DailiesCursor mySQLiteAdapter = new DailiesCursor(
getApplicationContext());
mySQLiteAdapter.openDataBase();
mySQLiteAdapter.insert("maindata", null, cv);
Cursor contentRead = mySQLiteAdapter.getLast();
startManagingCursor(contentRead);
contentRead.moveToFirst();
int id = 0;
while (contentRead.isAfterLast() == false) {
id = contentRead.getInt(0);
contentRead.moveToNext();
}
contentRead.close();
mySQLiteAdapter.close();
Log.i(TAG, "Start Game!");
// SELECT last_insert_rowid();
content.setDrawingCacheEnabled(false);
final Intent myIntent = new Intent(getApplicationContext(),
MainGame.class);
myIntent.putExtra("_id", Integer.toString(id));
startActivity(myIntent);
finish();
}
});
编辑1： 以下是xml文件，
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:id="@+id/rootView">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:scaleType="fitXY"
android:layout_weight="1"
android:src="@drawable/photocropscreen" />
<Button
android:id="@+id/back"
android:layout_width="100dp"
android:layout_height="90dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="@null"
android:text="BACK"
android:textColor="#ffffff"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="@+id/save"
android:layout_width="100dp"
android:layout_height="90dp"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="@null"
android:text="SAVE"
android:textColor="#ffffff"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="@+id/name"
android:layout_width="100dp"
android:layout_height="90dp"
android:layout_alignParentLeft="true"
android:layout_alignParentBottom="true"
android:layout_marginBottom="50dp"
android:text="NAME"
android:textColor="#ffffff"
android:background="@null"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="@+id/gender"
android:layout_width="100dp"
android:layout_height="90dp"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_marginBottom="50dp"
android:text="MALE"
android:textColor="#ffffff"
android:background="@null"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>