Android Button

package com.example.testapp;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.TextView;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.Toast;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
//                TextView textView = (TextView) findViewById(android.support.v7.appcompat.R.id.text);//                textView.setText("テスト");                Toast.makeText(view.getContext(), "テスト", Toast.LENGTH_LONG).show();
            }
        });

        Button button = (Button) findViewById(R.id.button_id);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                // TODO: ボタン押下時の処理を追加する                Toast.makeText(view.getContext(), "テストbutton", Toast.LENGTH_LONG).show();
            }
        });

//        layout.addView(button);    }

    @Override    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();

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

        return super.onOptionsItemSelected(item);
    }
}

----------------------------------------------------------------------------------------------

■strings.xml

<string name="button_txt">ボタン</string>

 

----------------------------------------------------------------------------------------------

■content_main.xml

    <Button
        android:id="@+id/button_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_txt"
        />

 

----------------------------------------------------------------------------------------------

■idx.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item type="id" name="button_id" />
</resources>