學習筆記專區

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.iii.lcpan.activity">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".NextActivity"></activity>
</application>
</manifest>

<resources>
    <string name="app_name">Activity</string>
    <string name="cel_lbl">攝氏：</string>
    <string name="fah_lbl">華氏：</string>
    <string name="btn_lbl">轉換成華式</string>
    <string name="msg">必須輸入值</string>
    <string name="lastpage">回上頁</string>
</resources>

第一頁：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.iii.lcpan.cf2.MainActivity">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="@string/cel_lbl" />
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="numberDecimal"
            android:ems="10"
            android:id="@+id/celsius" />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btn_lbl"
            android:id="@+id/submit" />
    </LinearLayout>
</RelativeLayout>

第二頁：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.iii.lcpan.activity.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/fah_lbl"
        android:id="@+id/fahrenheit" />


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/lastpage"
        android:id="@+id/lastpage"
        android:layout_marginTop="91dp"
        android:layout_below="@+id/fahrenheit"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

package com.iii.lcpan.activity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {//implements View.OnClickListener {
    private EditText cel;
    private Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        cel = (EditText) findViewById(R.id.celsius);
        btn = (Button) findViewById(R.id.submit);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    double f = (Double.parseDouble(cel.getText().toString())) * 9 / 5 + 32;
                    Intent intent = new Intent(MainActivity.this, NextActivity.class); //Intent(意圖)使用Bundle物件來傳送資料(本頁,要傳去的那頁)
                    Bundle bundle = new Bundle();
                    bundle.putDouble("f", f);
                    intent.putExtras(bundle);
                    startActivity(intent);
                } catch (Exception e) {
                    Toast.makeText(MainActivity.this, R.string.msg, Toast.LENGTH_LONG).show();

                }


            }
        });
    }

}

package com.iii.lcpan.activity;

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

public class NextActivity extends AppCompatActivity {//implements View.OnClickListener
    private Button btn;
    private TextView fah;

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

        fah = (TextView) findViewById(R.id.fahrenheit);
        Bundle bundle = getIntent().getExtras();
        double f = bundle.getDouble("f");
        fah.setText(getText(R.string.fah_lbl) + (Double.valueOf(f).toString()));

        btn = (Button) findViewById(R.id.lastpage);
//        btn.setOnClickListener(this);
        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                finish();
            }
        });
    }
}