Activity（三）

2022-11-11 18:56:17

常用控件

EditView、TextView、Button

设置layout，在fragment_main.xml配置控件

配置可编辑文本控件factorOne、factorTwo，显示文本控件symbol，按钮控件calculate

<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.activity01.MainActivity$PlaceholderFragment" >

    <EditText

        android:id="@+id/factorOne"

        android:layout_width="fill_parent"

         android:layout_height="wrap_content"/>

      <EditText

        android:id="@+id/factorTwo"

        android:layout_width="fill_parent"

         android:layout_height="wrap_content"

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

    <TextView

        android:id="@+id/sym"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

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

    <Button

        android:id="@+id/cal"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"

          android:layout_below="@+id/factorTwo"

        />

</RelativeLayout>

在values下string.xml设置symbol、calculate字符串

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

<resources>

    <string name="app_name">Activity01</string>

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

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

    <string name="sym">乘以</string>

    <string name="cal">计算</string>

</resources>

根据控件id取对象，为symbol和calculate设置显示的值

        private EditText factorOne=null;

    private EditText factorTwo=null;

    private TextView sym=null;

    private Button cal=null;

  @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

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

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

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

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

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

        sym.setText(R.string.sym);

        cal.setText(R.string.cal);

        cal.setOnClickListener(new CalListener());//监听器绑定到按钮上

        return true;

    }

监听器

class CalListener implements OnClickListener{

        @Override

        public void onClick(View v) {

            // TODO Auto-generated method stub

            String factorOneStr=factorOne.getText().toString();

            String factorTwoStr=factorTwo.getText().toString();

            Intent intent=new Intent();

            intent.putExtra("one", factorOneStr);

            intent.putExtra("two", factorTwoStr);

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

            MainActivity.this.startActivity(intent);

        }

    }

新建result.xml文件

     <TextView

        android:id="@+id/result"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

       />

新建ResultActivity，获取计算结果

public class ResultActivity extends Activity{

    private TextView resultView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.result);

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

        Intent intent=new Intent();

        String factorOneStr=intent.getStringExtra("one");

        String factorTwoStr=intent.getStringExtra("two");

        int factorOneInt=Integer.parseInt(factorOneStr);

        int factorTwoInt=Integer.parseInt(factorTwoStr);

        int result=factorOneInt * factorTwoInt;

        resultView.setText(result+"");

    }

}

注册ResultActivity

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.activity01"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="18" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.activity01.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity

            android:name="com.example.activity01.ResultActivity"

            android:label="@string/app_name" >

        </activity>

    </application>

</manifest>

设置menu菜单

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

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

        menu.add(0, 2, 3, R.string.about);

        return super.onCreateOptionsMenu(menu);

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // TODO Auto-generated method stub

        if(item.getItemId()==1){

            finish();

        }

        return super.onOptionsItemSelected(item);

    }

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