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Center View in RelativeLayout Android


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RelativeLayout like parent, child Srollview is centered horizontal.
Second RelativeLayout in SrollView have gravity center, every child will centered horizontally and vertically.


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="//schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:gravity="center_horizontal">

    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/scrollView2" >

        <RelativeLayout
            android:layout_width="320dp"
            android:layout_height="wrap_content"
            android:background="#e6f825"
            android:gravity="center">

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="New Button"
                android:id="@+id/button" />
        </RelativeLayout>
    </ScrollView>

</RelativeLayout>

397LW NO topic_id




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Další témata ....(Topics)


135

Draw Arc Android basic example | draw-arc-android-basic-example


drawArc(), Canvas, Paint, setStyle()

public class MainActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new SampleView(this));
	}

	private static class SampleView extends View {

		// CONSTRUCTOR
		public SampleView(Context context) {
			super(context);
			setFocusable(true);

		}

		@Override
		protected void onDraw(Canvas canvas) {

			canvas.drawColor(Color.CYAN);
			Paint p = new Paint();
			// smooths
			p.setAntiAlias(true);
			p.setColor(Color.RED);
			p.setStyle(Paint.Style.STROKE); 
			p.setStrokeWidth(5);
			// opacity
			//p.setAlpha(0x80); //
 
			RectF rectF = new RectF(50, 20, 100, 80);
			canvas.drawOval(rectF, p);
			p.setColor(Color.BLACK);
			canvas.drawArc (rectF, 90, 45, true, p);
		}

	}
}

351

Fragment FragmentBasic.zip null pointer TextView article | fragment-fragmentbasic-zip-null-pointer-textview-article


Example have error code:
//developer.android.com/training/basics/fragments/creating.html

Try to change ArticleFragment.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      //www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.fragments;

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class ArticleFragment extends Fragment {
    final static String ARG_POSITION = "position";
    int mCurrentPosition = -1;
    TextView articleText;
    @Override
//    public View onCreateView(LayoutInflater inflater, ViewGroup container,
//        Bundle savedInstanceState) {
//
//        // If activity recreated (such as from screen rotate), restore
//        // the previous article selection set by onSaveInstanceState().
//        // This is primarily necessary when in the two-pane layout.
//        if (savedInstanceState != null) {
//            mCurrentPosition = savedInstanceState.getInt(ARG_POSITION);
//        }
//
//        // Inflate the layout for this fragment
//        return inflater.inflate(R.layout.article_view, container, false);
//    }
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        // If activity recreated (such as from screen rotate), restore
        // the previous article selection set by onSaveInstanceState().
        // This is primarily necessary when in the two-pane layout.
        if (savedInstanceState != null) {
            mCurrentPosition = savedInstanceState.getInt(ARG_POSITION);
        }

        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.article_view, container, false);
        articleText = (TextView) rootView.findViewById(R.id.article);
        return rootView;
    }
    @Override
    public void onStart() {
        super.onStart();

        // During startup, check if there are arguments passed to the fragment.
        // onStart is a good place to do this because the layout has already been
        // applied to the fragment at this point so we can safely call the method
        // below that sets the article text.
        Bundle args = getArguments();
        if (args != null) {
            // Set article based on argument passed in
            updateArticleView(args.getInt(ARG_POSITION));
        } else if (mCurrentPosition != -1) {
            // Set article based on saved instance state defined during onCreateView
            updateArticleView(mCurrentPosition);
        }
    }

    public void updateArticleView(int position) {
        //TextView article = (TextView) getActivity().findViewById(R.id.article); //Error: article=null.
        if (articleText != null)
            articleText.setText(Ipsum.Articles[position]);
        mCurrentPosition = position;
    }
/* ERROR   public void updateArticleView(int position) {
        TextView article = (TextView) getActivity().findViewById(R.id.article);
        article.setText(Ipsum.Articles[position]);
        mCurrentPosition = position;
    }*/

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        // Save the current article selection in case we need to recreate the fragment
        outState.putInt(ARG_POSITION, mCurrentPosition);
    }
}
229

Which version of eclipse for android development | which-version-of-eclipse-for-android-development


I tried this Eclipse and work fine:
Eclipse Classic
//www.filehippo.com/download_eclipse_classic_32/

Eclipse Juno
Eclipse Helios

//developer.android.com/tools/sdk/eclipse-adt.html
183

HTC Sensation 4G | htc-sensation-4g


HTC Sensation 4G cena od 11 000 KCZ Kč (únor.2012)
Spokojenost uživatelů nadprůměrná.
HTC Sensation 4G je chytrý telefon s operačním systémem Android.
HTC Sensation 4G je (22.února2012) 10. nejpoužívanějším chytrým telefonem u programu Sky Map viz tabulka.


Výrobce HTC
Kompatibilní sítě GSM / GPRS / EDGE
850 900 1800 1900 MHz
UMTS / HSPA
850 1900 2100 nebo 900 1700 2100 MHz
HSDPA 14,4 Mbps
HSUPA 5.76 Mbps
První předvedení 19.května 2011
Zaváděcí cena US 199,99 dolarů
Nástupce HTC Sensation XE, HTC 4G Amaze
Rozměry 126.1 mm (4.96 v) H
65.4 mm 2,57 in) W
11.3 mm (0,44 in) D
Hmotnost 148 g
Operační systém Android 2.3.3 Gingerbread (upgrade až na 2.3.4),
HTC Sense 3.0 overlay

Procesor:
Dual-core CPU, 1.2 GHz Qualcomm MSM8260 Snapdragon, Sensation XE dual-core 1,5 GHz Qualcomm MSM8260 Snapdragon, Sensation XL jednoho jádra 1,5 GHz Qualcomm MSM8255 Snapdragon
GPU Qualcomm adreno 220, Sensation XL adreno 205

Paměť 768 MB RAM
4 GB (1 GB uživatelsky dostupných)
Paměť vyjmutelná: 8 GB microSD 2.0, podporuje až 32 GB

Baterie 1520 mAh vnitřní dobíjecí Li-ion vyměnitelné
Datové vstupy A-GPS, čidlo okolního osvětlení, digitální kompas, G-senzor, gyroskop, multi-touch kapacitní dotykový displej, snímač
Displej 4.3 v (110 mm) kapacitní S-LCD dotykový displej Gorilla skla s QHD (540 × 960) rozlišením na 256.15 PPI
Fotoaparát na zadní straně s 8 miliony pixelů (3264 x 2448) s automatickým ostřením a dvojitým LED bleskem a 1080p HD video záznamu @ 30 snímků / s, kohoutek k zaměření s digitálním zoomem
Fotoaparát na přední straně VGA pevné zaostření barevná kamera (0,3 megapixelů)
Kompatibilní média formáty audio AAC, AMR, OGG, M4A, MIDI, MP3, WAV, WMA
Video 1920 × 1080 (1080p HD) @ 30 snímků / s - 3GP, .3 G2, MP4, WMV, AVI, XVID
Vyzváněcí tóny a oznámení všechny kompatibilní audio formáty
Vibrace
Připojení 3.5 mm TRRS konektor, Bluetooth 3.0 s A2DP, FM přijímač (87,5 - 108 MHz) s RDS, Micro USB 2.0 (5-pin) port s Mobile High-Definition Link (MHL) pro USB nebo HDMI připojení, Wi-Fi 802.11b/g/n
Zdroj: wikipedia


HTC Sensation 4G photo pic image
HTC Sensation 4G
Zdroj obrázku: wikipedia
110

Create Button and TextView dynamically - Android sample | create-button-dynamically-android-sample



public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        LinearLayout layout = (LinearLayout) findViewById(R.id.layout);
            TextView textView = new TextView(this);
            textView.setText("Text View ");
            LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.FILL_PARENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT
            );
            layout.addView(textView, p);

            Button buttonView = new Button(this);
            buttonView.setText("Button");
            buttonView.setOnClickListener(mThisButtonListener);
            layout.addView(buttonView, p);
        
    }
    private OnClickListener mThisButtonListener = new OnClickListener() {
        public void onClick(View v) {
            Toast.makeText(MainActivity.this, "Hello !",
                    Toast.LENGTH_LONG).show();
        }
    };
}


Editace: 2016-03-14 17:39:25
Počet článků v kategorii: 397
Url:center-view-in-relativelayout-android

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