Android控件之-EditTextAndTextView

用TextView和EditText写一个简单的计算器，能实现加减乘除的操作

package com.ko8e;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Activity01 extends Activity {
    /** Called when the activity is first created. */
    private TextView view = null;
	private EditText edit1 = null;
	private EditText edit2 = null;
	private Button button = null;
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        view = (TextView) findViewById(R.id.view);
        view.setText(R.string.view);
        
        edit1 = (EditText) findViewById(R.id.edit1);
        edit2 = (EditText) findViewById(R.id.edit2);

        button = (Button) findViewById(R.id.button);
        button.setText(R.string.caculate);
        button.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				String s1 = edit1.getText().toString();
		        String s2 = edit2.getText().toString();
				Intent intent = new Intent();
				intent.putExtra("s1", s1);
				intent.putExtra("s2", s2);
				intent.setClass(Activity01.this, ResultActivity.class);
				Activity01.this.startActivity(intent);
			}
		});
    }
}

计算得到的值放在跳转的Activity

package com.ko8e;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class ResultActivity extends Activity {
	/** Called when the activity is first created. */
	private TextView view2 = null;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.result);
		view2 = (TextView) findViewById(R.id.resultview);
		Intent intent = getIntent();
		String firstValueStr = intent.getStringExtra("s1");
		String secondValueStr = intent.getStringExtra("s2");
		int n1 = Integer.parseInt(firstValueStr);
		int n2 = Integer.parseInt(secondValueStr);
		int resultValue = (n1 * n2);
		view2.setText(resultValue + "");
	}
}

在layout文件中再添加一个xml（略）。

main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<EditText
	android:id="@+id/edit1"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	/>
<TextView  
	android:id="@+id/view"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
 <EditText
 	android:id="@+id/edit2"
 	android:layout_width="fill_parent"
 	android:layout_height="wrap_content"
	/>
<Button
	android:id="@+id/button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	/>
</LinearLayout>

记得在manifest.xml中把第二个Activity添加进去：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.ko8e"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Activity01"
                  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=".ResultActivity"
					android:label="@string/app_name"
				/>
    </application>
    <uses-sdk android:minSdkVersion="4" />

</manifest>