Android學習筆記-EditText&TextView&Button&菜單欄

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界面文件activity_main.xml

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<RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"

xmlns:tools="https://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.example.activity_03.MainActivity" >

<EditText

android:id="@+id/factor_one"

android:layout_width="fill_parent"

android:layout_height="wrap_content" />

<TextView

android:id="@+id/symbol"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/factor_one" />

<EditText

android:id="@+id/factor_two"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/symbol" />

<Button

android:id="@+id/multiply"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/factor_two" />

</RelativeLayout>

界面文件result.xml

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<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<TextView

android:id="@+id/result"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

</LinearLayout>

MainActivity.java

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public class MainActivity extends ActionBarActivity {

private EditText factor_one;

private EditText factor_two;

private TextView symbol;

private Button multiply;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

factor_one = (EditText) findViewById(R.id.factor_one);

factor_two = (EditText) findViewById(R.id.factor_two);

symbol = (TextView) findViewById(R.id.symbol);

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

symbol.setText(R.string.symbol);

multiply.setText("計算");

multiply.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String factor_one_str = factor_one.getText().toString();

String factor_two_str = factor_two.getText().toString();

Intent intent = new Intent();

intent.putExtra("factor_one_str", factor_one_str);

intent.putExtra("factor_two_str", factor_two_str);

intent.setClass(MainActivity.this, ResultActivity.class);

MainActivity.this.startActivity(intent);

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {//設置菜單

//MenuItem android.view.Menu.add(int groupId, int itemId, int order, int titleRes)

menu.add(0, 1, 1, R.string.about);

menu.add(0, 2, 2, R.string.exit);

return super.onCreateOptionsMenu(menu);

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {//選中菜單選項之後進行的操作

if (item.getItemId() == 1) {//關於

}else if (item.getItemId() == 2) {//退出

finish();

}

return super.onOptionsItemSelected(item);

}

}

ResultActivity.java

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public class ResultActivity extends Activity{

private TextView result;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.result);

String factor_one_str = getIntent().getStringExtra("factor_one_str");

String factor_two_str = getIntent().getStringExtra("factor_two_str");

int factor_one = Integer.parseInt(factor_one_str);

int factor_two = Integer.parseInt(factor_two_str);

result = (TextView) findViewById(R.id.result);

result.setText(factor_one * factor_two + "");

}

}

strings.xml

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<?xml version="1.0" encoding="utf-8"?>

<resources>

<string name="app_name">Activity_03</string>

<string name="hello_world">Hello world!</string>

<string name="action_settings">Settings</string>

<string name="symbol">乘以</string>

<string name="exit">退出</string>

<string name="about">關於</string>

</resources>

AndroidManifest.xml 中註冊Activity

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<activity android:name=".ResultActivity" android:label="ResultActivity"/>

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