Layout manager
لیوت منیجر وظیفه‌ی تنظیم ظاهر خود و مدیریت چیدمان ویو های فرزندش را به عهده دارد. در واقع لیوت منیجر یک کلاس مشتق شده از ویو گروپ است.
لیوت منیجر های متعددی در سیستم اندروید تعبیه شده که در زیر به پرکاربردترین آنها اشاره میشود:
1-ConstraintLayout
2-LinearLayout
3-FarmeLayout
4-RelativeLayout
5-GridLayout
کد های مربوط به layuot
- <LinearLayout xmlns:android="
" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" android:background="#000000" android:baselineAligned="false" tools:context=".MainActivity">
<LinearLayout android:layout_width="0dp" android:layout_height="fill_parent" android:layout_weight="1" android:gravity="center" android:orientation="vertical">
<ScrollView android:id="@+id/scrollView1" android:layout_width="match_parent" android:layout_height="77dp">
- <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">
<TextView android:id="@+id/textView2" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#009900" android:text="" android:textAppearance="?android:attr/textAppearanceMedium" android:textColor="#EEEEEE" />
<TextView android:id="@+id/textView3" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#ff6600" android:text="" android:textAppearance="?android:attr/textAppearanceMedium" android:textColor="#EEEEEE" />
<TextView android:id="@+id/textView4" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#ff00cc" android:text="" android:textColor="#EEEEEE" android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView android:id="@+id/textView5" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="" android:textColor="#EEEEEE" android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
</ScrollView>
<Button android:id="@+id/btnCapturePicture" android:layout_width="80dp" android:layout_height="80dp" android:layout_marginBottom="10dp" android:background="@drawable/gerd" android:text="عکس گرفتن" android:textColor="#EEEEEE" />
<Button android:id="@+id/btnRecordVideo" android:layout_width="80dp" android:layout_height="80dp" android:background="@drawable/gerd" android:text="فیلم برداری" android:textColor="#EEEEEE" />
</LinearLayout>
- <LinearLayout android:layout_width="0dp" android:layout_height="fill_parent" android:layout_weight="1" android:orientation="vertical" android:padding="10dp">
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="نمایش محتوا" android:padding="10dp" android:textColor="#EEEEEE" android:textSize="15dp" />
<ImageView android:id="@+id/imgPreview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#EEEEEE" android:visibility="gone" />
<VideoView android:id="@+id/videoPreview" android:layout_width="wrap_content" android:layout_height="400dp" android:visibility="gone" />
</LinearLayout>
</LinearLayout>
کد های کلاس جاوا
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;
public class Camera_Test extends Activity {
MediaPlayer mdp,answer,errorr;
private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
private static final int CAMERA_CAPTURE_VIDEO_REQUEST_CODE = 200;
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
TextView tv1,tv2,tv3,tv4;
// directory name to store captured images and videos
private static final String IMAGE_DIRECTORY_NAME = "AndroidSajad";
private Uri fileUri; // file url to store image/video
private ImageView imgPreview;
private VideoView videoPreview;
private Button btnCapturePicture, btnRecordVideo;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.camera_test);
mdp = MediaPlayer.create(Camera_Test.this,R.raw.loading);
answer = MediaPlayer.create(Camera_Test.this,R.raw.answerq);
errorr = MediaPlayer.create(Camera_Test.this,R.raw.errorr);
tv1 = (TextView)findViewById(R.id.textView2);
tv2 = (TextView)findViewById(R.id.textView3);
tv3 = (TextView)findViewById(R.id.textView4);
tv4 = (TextView)findViewById(R.id.textView5);
imgPreview = (ImageView) findViewById(R.id.imgPreview);
videoPreview = (VideoView) findViewById(R.id.videoPreview);
btnCapturePicture = (Button) findViewById(R.id.btnCapturePicture);
btnRecordVideo = (Button) findViewById(R.id.btnRecordVideo);
btnCapturePicture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// capture picture
answer.start();
captureImage();
}
});
btnRecordVideo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// record video
answer.start();
recordVideo();
}
});
// Checking camera availability
if (!isDeviceSupportCamera()) {
errorr.start();
Toast.makeText(getApplicationContext(),
"دوربین دستگاه شما پشتیبانی نمی شود",
Toast.LENGTH_LONG).show();
finish();
}
}
private boolean isDeviceSupportCamera() {
if (getApplicationContext().getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA)) {
// this device has a camera
return true;
} else {
// no camera on this device
return false;
}
}
/**
* Capturing Camera Image will lauch camera app requrest image capture
*/
private void captureImage() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
// start the image capture Intent
startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
tv1.setText("فعال کردن دوربین...");
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putParcelable("sajad", fileUri);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// get the file url
fileUri = savedInstanceState.getParcelable("sajad");
}
private void recordVideo() {
Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(intent, CAMERA_CAPTURE_VIDEO_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// if the result is capturing Image
if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
tv2.setText("عکس گرفته شد");
previewCapturedImage();
} else if (resultCode == RESULT_CANCELED) {
// user cancelled Image capture
tv2.setText("؟؟؟لغو عکس گرفتن");
} else {
// failed to capture image
tv2.setText("!!!اشکال در گرفتن عکس");
}
} else if (requestCode == CAMERA_CAPTURE_VIDEO_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
tv2.setText("ویدیو با موفقیت ثبت شد");
// video successfully recorded
// preview the recorded video
previewVideo();
} else if (resultCode == RESULT_CANCELED) {
// user cancelled recording
tv2.setText("ضبط فیلم متوقف شد!!!");
} else {
// failed to record video
tv2.setText("خطا در ضبط فیلم...؟؟؟");
}
}
}
/**
* Display image from a path to ImageView
*/
private void previewCapturedImage() {
try {
// hide video preview
videoPreview.setVisibility(View.GONE);
imgPreview.setVisibility(View.VISIBLE);
// bimatp factory
BitmapFactory.Options options = new BitmapFactory.Options();
// downsizing image as it throws OutOfMemory Exception for larger
// images
options.inSampleSize = 8;
final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(),
options);
imgPreview.setImageBitmap(bitmap);
tv3.setText("ذخیره عکس انجام شد");
} catch (NullPointerException e) {
e.printStackTrace();
}
}
/**
* Previewing recorded video
*/
private void previewVideo() {
try {
// hide image preview
imgPreview.setVisibility(View.GONE);
tv3.setText("ذخیره فیلم انجام شد");
videoPreview.setVisibility(View.VISIBLE);
videoPreview.setVideoPath(fileUri.getPath());
// start playing
videoPreview.start();
tv4.setText("نمایش فیلم گرفته شده ");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* ------------ Helper Methods ----------------------
* */
/**
* Creating file uri to store image/video
*/
public Uri getOutputMediaFileUri(int type) {
return Uri.fromFile(getOutputMediaFile(type));
}
/**
* returning image / video
*/
private static File getOutputMediaFile(int type) {
// External sdcard location
File mediaStorageDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
IMAGE_DIRECTORY_NAME);
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
+ IMAGE_DIRECTORY_NAME + " directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator
+ "IMG_" + timeStamp + ".jpg");
} else if (type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator
+ "VID_" + timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
}
فقط مجوز ها رو خودت در منیفست وارد کن"
