activity_main xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#ffaa88"
    tools:context=".MainActivity">

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/word"/>
        <EditText
            android:id="@+id/uriname"
            android:inputType="text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal" >
        <Button
            adnroid:id="@+id/post"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:text="@string/post" />
        <Button
            android:id="@+id/browser"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:text="@string/browser" />
    </LinearLayout>

    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

mainActivity

package com.capital.connectmysql;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private UploadTask task;
    private TextView textView;
    private EditText editText;

    String url = "http://hpscript/android/pass_check.html";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editText = findViewById(R.id.uriname);

        Button post = findViewById(R.id.post);

        post.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                String param0 = editText.getText().toString();

                if(param0.length() != 0){
                    task = new UploadTask();
                    task.setListener(createListener());
                    task.execute(param0);
                }
            }
        });

        Button browser = findViewById(R.id.browser);
        browser.setOnClickListener(new View.OnClickListenr(){
            @Override
            public void onClick(View v){
                Uri uri = Uri.parse(url);
                Intent intent = new Intent(Intent.ACTION_VIEW,uri);
                startActivity(intent);

                textView.setText("");
            }
        });
        textView = findViewById(R.id.text_view);
    }

    @Override
    protected void onDestroy(){
        task.setListener(null);
        super.onDestory();
    }

    private UploadTask.Listener createListener(){
        return new UploadTask.Listener(){
            @Override
            public void onSuccess(String result){
                textView.setText(result);
            }
        };
    }
}

package com.capital.connectmysql;

import android.net.sip.SipAudioCall;
import android.os.AsyncTask;
import android.util.Log;

import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class UploadTask extends AsyncTask<String, Void, String> {

    private SipAudioCall.Listener listener;

    @Override
    protected String doInBackground(String... params){

        String urlSt = "http://hpscript.com/";

        HttpURLConnection con = null;
        String result = null;
        String word = "word="+params[0];

        try {
            URL url = new URL(urlSt);

            con = (HttpURLConnection) url.openConnection();

            con.setRequestMethod("POST");
            con.setInstanceFollowRedirects(false);
            con.setDoOutput(true);

            con.setReadTimeout(10000);
            con.setConnectTimeout(20000);

            con.connect();

            OutputStream out = null;
            try {
                out = con.getOutputStream();
                out.write( word.getBytes("UTF-8"));
                out.flush();
                Log.d("dubug", "flush");
            } catch (IOException e){
                e.printStackTrack();
                result = "POST送信エラー";
            } finally {
                if (out != null){
                    out.close();
                }
            }
            final int status = con.getResponseCode();
            if (status == HttpURLConnection.HTTP_OK){
                result = "HTTP_OK";
            } else {
                result = "status="+String.valueOf(status);
            }
        } catch(IOException e){
            e.printStackTrace();
        } finally {
            if (con != null){
                con.disconnect();
            }
        }
        return result;
    }

    @Override
    protected void onPostExecute(String result){
        super.onPostExecute(result);

        if(listener != null){
            listener.onSuccess(result);
        }
    }

    void setListener(SipAudioCall.Listener listener){
        this.listener = listener;
    }

    interface Listener {
        void onSuccess(String result);
    }
}

Android Studioでdependencyを追加する。

file -> project structure を押す

dependency -> libraries dependency を選択する

dependenciesが追加される。

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'org.jdom:jdom2:2.0.6'
}

list view

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="50dp"
    android:weightSum="1">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:id="@+id/textView" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Medium Text"
        android:id="@+id/textView2"
        android:layout_weight="0.08" />
</LinearLayout>

rss parse

package com.capital.anew;

import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private Handler handler;
    private final String RSS_URL = "http://m-shige1979.hatenablog.com/rss";
    private TextView text1;
    private String RssText;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        handler = new Handler();
        setContentView(R.layout.activity_main);
        text1 = (TextView)findViewById(R.id.textview1);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu){

        MenuItem item1 = menu.add("UPDATE");
        item1.setIcon(android.R.drawable.ic_menu_upload);

        item1.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener(){
            @Override
            public boolean onMenuItemClick(MenuItem item){

                Thread thread1 = new Thread(){
                    @Override
                    public void run(){
                        try {
                            RssText = RssParse.getRss(MainActivity.this, RSS_URL);

                            handler.post(new Runnable(){
                                @Override
                                public void run(){
                                    text1.setText(RssText);
                                    Toast.makeText(MainActivity.this, "読み込み終了", Toast.LENGTH_SHORT).show();

                                }
                            });
                        } catch (Exception e){
                            Log.d("sample", e.getMessage());
                        }
                    }
                };
                thread1.start();
                return false;
            }
        });

        item1.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);

        getMenuInflater().inflate(R.menu.menu_main, menu);

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item){
        int id = item.getItemId();

        if(id == R.id.action_settings){
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

}

package com.capital.anew;

import android.content.Context;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class parse {
public static String getRss(Context context, String url)
throws IOException {

StringBuilder sb = new StringBuilder();

AndroidHttpClient client = AndroidHttpClient.newInstance(“TEST”);
HttpGet get = new HttpGet(url);

try {
HttpResponse response = client.execute(get);

BufferedReader br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String line = null;
while((line = br.readLine()) != null){
sb.append(line);
}
} finally {
client.close();
}
return sb.toString();
}
}
[/code]

android unresolved dependencies error when creating a new project

エラーログに記載のdependenciesを修正する

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

Gradle Build Runningがやけに時間がかかる。

そもそもandroid sdkとは？
Android SDK【Android Software Development Kit】
Android OSを搭載したスマートフォンやタブレット端末で動作するプログラムを開発するために必要なソフトウェアをひとまとめにしたパッケージで、コンパイラやデバッガ、ライブラリ、デバイスドライバ、ドキュメント、サンプルコード、パソコン上で端末を再現するエミュレータなどで構成される。

constraint-layout:1.1.2を1.1.0にしたらエラーが消えた。1.1.2は新しいversionだから、新しすぎると駄目なのか。Gradle build finished. 謎だ。

implementation 'com.android.support.constraint:constraint-layout:1.1.2'

implementation 'com.android.support.constraint:constraint-layout:1.1.0'

classとidの違い

■class：
「種別名を割り当てる」
→ 同じclass名を、1ページ中に何度でも使える。

■id：
「固有の名前を割り当てる」
→ 同じid名は、1ページ中に1度しか使えない。

<!-- .content#title -->
<!-- /.content#title -->