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 Android教程網 >> Android技術 >> 關於Android編程 >> Android學習筆記-EditText&TextView&Button&菜單欄

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

編輯:關於Android編程

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界面文件activity_main.xml

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 <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.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

1 2 3 4 5 6 7 8 9 10 11 12 xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 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

1 2 3 4 5 6 7 8 9 10 xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">Activity_03string> <string name="hello_world">Hello world!string> <string name="action_settings">Settingsstring> <string name="symbol">乘以string> <string name="exit">退出string> <string name="about">關於string> resources>

AndroidManifest.xml 中注冊Activity

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

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