在android应用程序中，通过摄像头拍照后，屏幕变暗。如何避免这种情况？
在我的应用程序中，我的目的是允许用户从相机中拍照或从多媒体资料中选择。拍摄或选择照片后，它将显示在ImageView中。所有这些都发生在活动1中，当用户单击编辑按钮时，第二个活动开始，用户可以在其中编辑图片。现在我面临着4个问题，这是我过去几天一直在努力解决的，但我需要一些帮助，因为我是一个Android编程的初学者在android应用程序中，通过摄像头拍照后，屏幕变暗。如何避免这种情况？,android,image,bitmap,camera,uri,Android,Image,Bitmap,Camera,Uri,在我的应用程序中，我的目的是允许用户从相机中拍照或从多媒体资料中选择。拍摄或选择照片后，它将显示在ImageView中。所有这些都发生在活动1中，当用户单击编辑按钮时，第二个活动开始，用户可以在其中编辑图片。现在我面临着4个问题，这是我过去几天一直在努力解决的，但我需要一些帮助，因为我是一个Android编程的初学者 从相机拍摄照片后，它将显示在ImageView中，屏幕开始闪烁并变暗 当从相机拍摄时，屏幕上显示的图像尺寸非常小，但当从gallery中选择图像时，屏幕上显示的图像尺寸稍大。这和从
public class HowItWorksActivity extends Activity {
ImageButton btn_Account,btn_Photo,btn_Edit,btn_Flip,btn_Post;
RelativeLayout rl;
private static final int CAMERA_PIC_REQUEST = 2500;
private static final int SELECT_PICTURE = 1;
Bitmap bmap_image;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_how_it_works);
addListenerOnButton();
}
private void addListenerOnButton() {
btn_Photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
PopupMenu photo_menu = new PopupMenu(HowItWorksActivity.this, v);
photo_menu.getMenuInflater().inflate(R.menu.photo_menu, photo_menu.getMenu());
photo_menu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId()){
case R.id.take_a_picture:
takepicture();
break;
case R.id.upload_photo:
getPicture();
break;
}
return true;
}
private void getPicture() {
// TODO Auto-generated method stub
Intent getPicIntent = new Intent();
getPicIntent.setType("image/*");
getPicIntent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(getPicIntent, "Select Picture"), SELECT_PICTURE);
}
private void takepicture() {
// TODO Auto-generated method stub
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
}
});
photo_menu.show();
}
});
btn_Edit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent editIntent = new Intent(HowItWorksActivity.this,EditPhotoActivity.class);
if (bmap_image !=null)
editIntent.putExtra("post_card", bmap_image);
startActivity(editIntent);
}
});
@SuppressWarnings("deprecation")
protected void onActivityResult(int requestCode,int resultCode,Intent data){
Bitmap image = null;
ImageView imgview = (ImageView) findViewById(R.id.ImgViewForPic);
rl = (RelativeLayout) findViewById(R.id.R_layoutPic);
Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.bg);
rl.setBackgroundDrawable(drawable);
if(requestCode == CAMERA_PIC_REQUEST){
image = (Bitmap) data.getExtras().get("data");
bmap_image = image;
imgview.setImageBitmap(image);
}
if (resultCode == RESULT_OK){
if(requestCode == SELECT_PICTURE && data!=null && data.getData()!=null){
Uri selectedImgUri = data.getData();
Cursor cursor = getContentResolver().query(selectedImgUri, new String[] {MediaStore.Images.ImageColumns.DATA}, null, null, null);
cursor.moveToFirst();
cursor.close();
try {
bmap_image = MediaStore.Images.Media.getBitmap(this.getContentResolver(), selectedImgUri);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
imgview.setImageURI(selectedImgUri);
}
}
super.onActivityResult(requestCode, resultCode, data);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
if(bmap_image!=null)
outState.putParcelable("post_card", bmap_image);
super.onSaveInstanceState(outState);
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/R_layoutPic"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/instruction_landscape"
tools:context=".HowItWorksActivity" >
<RelativeLayout
android:id="@+id/RlayoutButtons"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_alignParentBottom="true"
android:background="@drawable/bottom_nav" >
<ImageButton
android:id="@+id/btn_Edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toRightOf="@+id/btn_Photo"
android:contentDescription="@string/content"
android:paddingTop="10dp"
android:src="@drawable/icon_edit" />
<ImageButton
android:id="@+id/btn_Photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/btn_Account"
android:layout_toRightOf="@+id/btn_Account"
android:contentDescription="@string/content"
android:paddingTop="10dp"
android:src="@drawable/icon_pickphoto" />
</RelativeLayout>
<ImageView
android:id="@+id/ImgViewForPic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/RlayoutButtons"
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:layout_marginBottom="188dp"
android:contentDescription="@string/content" />
imgView = (ImageView) findViewById(R.id.imgViewEdit_Pic);
imageBitmap = this.getIntent().getParcelableExtra("post_card");
public class HowItWorksActivity extends Activity {
ImageButton btn_Account,btn_Photo,btn_Edit,btn_Flip,btn_Post;
RelativeLayout rl;
private static final int CAMERA_PIC_REQUEST = 2500;
private static final int SELECT_PICTURE = 1;
Bitmap bmap_image;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_how_it_works);
addListenerOnButton();
}
private void addListenerOnButton() {
btn_Photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
PopupMenu photo_menu = new PopupMenu(HowItWorksActivity.this, v);
photo_menu.getMenuInflater().inflate(R.menu.photo_menu, photo_menu.getMenu());
photo_menu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId()){
case R.id.take_a_picture:
takepicture();
break;
case R.id.upload_photo:
getPicture();
break;
}
return true;
}
private void getPicture() {
// TODO Auto-generated method stub
Intent getPicIntent = new Intent();
getPicIntent.setType("image/*");
getPicIntent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(getPicIntent, "Select Picture"), SELECT_PICTURE);
}
private void takepicture() {
// TODO Auto-generated method stub
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
}
});
photo_menu.show();
}
});
btn_Edit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent editIntent = new Intent(HowItWorksActivity.this,EditPhotoActivity.class);
if (bmap_image !=null)
editIntent.putExtra("post_card", bmap_image);
startActivity(editIntent);
}
});
@SuppressWarnings("deprecation")
protected void onActivityResult(int requestCode,int resultCode,Intent data){
Bitmap image = null;
ImageView imgview = (ImageView) findViewById(R.id.ImgViewForPic);
rl = (RelativeLayout) findViewById(R.id.R_layoutPic);
Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.bg);
rl.setBackgroundDrawable(drawable);
if(requestCode == CAMERA_PIC_REQUEST){
image = (Bitmap) data.getExtras().get("data");
bmap_image = image;
imgview.setImageBitmap(image);
}
if (resultCode == RESULT_OK){
if(requestCode == SELECT_PICTURE && data!=null && data.getData()!=null){
Uri selectedImgUri = data.getData();
Cursor cursor = getContentResolver().query(selectedImgUri, new String[] {MediaStore.Images.ImageColumns.DATA}, null, null, null);
cursor.moveToFirst();
cursor.close();
try {
bmap_image = MediaStore.Images.Media.getBitmap(this.getContentResolver(), selectedImgUri);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
imgview.setImageURI(selectedImgUri);
}
}
super.onActivityResult(requestCode, resultCode, data);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
if(bmap_image!=null)
outState.putParcelable("post_card", bmap_image);
super.onSaveInstanceState(outState);
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/R_layoutPic"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/instruction_landscape"
tools:context=".HowItWorksActivity" >
<RelativeLayout
android:id="@+id/RlayoutButtons"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_alignParentBottom="true"
android:background="@drawable/bottom_nav" >
<ImageButton
android:id="@+id/btn_Edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toRightOf="@+id/btn_Photo"
android:contentDescription="@string/content"
android:paddingTop="10dp"
android:src="@drawable/icon_edit" />
<ImageButton
android:id="@+id/btn_Photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/btn_Account"
android:layout_toRightOf="@+id/btn_Account"
android:contentDescription="@string/content"
android:paddingTop="10dp"
android:src="@drawable/icon_pickphoto" />
</RelativeLayout>
<ImageView
android:id="@+id/ImgViewForPic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/RlayoutButtons"
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:layout_marginBottom="188dp"
android:contentDescription="@string/content" />
请尽快有人来帮助我。对于该活动，您可以始终打开屏幕，以避免屏幕变暗。谢谢您的回复。这似乎不是解决问题的办法。不过我确实试过了。它使屏幕保持活动状态，但只要我从相机拍摄照片并显示图像，屏幕就会开始闪烁几秒钟，屏幕就会变好