android基础(Activity)

package ahu.edu; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class Activity03Activity extends Activity { private EditText factorOne; private EditText factorTwo; private TextView symbol; private Button calculate; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); factorOne = (EditText)findViewById(R.id.factorOne); factorTwo = (EditText)findViewById(R.id.factorTwo); symbol = (TextView)findViewById(R.id.symbol); calculate = (Button)findViewById(R.id.calculate); symbol.setText(R.string.symbol); calculate.setText(R.string.calculate); calculate.setOnClickListener(new CalcualteListener()); } class CalcualteListener implements OnClickListener { public void onClick(View v) { String factorOneStr = factorOne.getText().toString(); String factorTwoStr = factorTwo.getText().toString(); Intent intent = new Intent(); intent.putExtra("one", factorOneStr); intent.putExtra("two", factorTwoStr); intent.setClass(Activity03Activity.this,ResualActivity.class); Activity03Activity.this.startActivity(intent); } } public boolean onCreateOptionsMenu(Menu menu) { menu.add(0, 1, 1,R.string.exit); menu.add(0, 2, 2,R.string.about); return super.onCreateOptionsMenu(menu); } public boolean onOptionsItemSelected(MenuItem item) { if(item.getItemId() == 1) { //finish(); //----比较柔和的方式 System.exit(0); //---残酷的方式 } return super.onOptionsItemSelected(item); } }package ahu.edu; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.widget.TextView; public class ResualActivity extends Activity{ private TextView resultView; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.result); resultView = (TextView)findViewById(R.id.result); Intent intent = getIntent(); String factorOneString = intent.getStringExtra("one"); String factorTwoString = intent.getStringExtra("two"); int factorOneInt = Integer.parseInt(factorOneString); int factorTwoInt = Integer.parseInt(factorTwoString); int result = factorOneInt * factorTwoInt; resultView.setText(result + ""); } }
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <EditText android:id="@+id/factorOne" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="@string/message" android:inputType="none"/> <TextView android:id="@+id/symbol" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text=""/> <EditText android:id="@+id/factorTwo" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="@string/message" android:inputType="none"/> <Button android:id="@+id/calculate" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="ahu.edu" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".Activity03Activity" 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=".ResualActivity" android:label="@string/app_name"> </activity> </application> </manifest>