Android(安卓)Intent初步试用

Intent 的初步使用，用于切换Activity，同时传递一些参数到目的Activity

实现一个类似乘法的功能

MainActivity.java

public class MainActivity extends Activity implements OnClickListener{
/** Called when the activity is first created. */
//第一个乘数框
EditText m1;
//第二个乘数框
EditText m2;
//结果框
EditText result;
//计算按钮
Button calu;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//从main.xml中得到定义的几个EditText
m1=(EditText)this.findViewById(R.id.m1);
m2=(EditText)this.findViewById(R.id.m2);
result=(EditText)this.findViewById(R.id.result);
//从main.xml中得到定义的几个Button
calu=(Button)this.findViewById(R.id.calu);
//给按钮添加Onclick事件注册监听
calu.setOnClickListener(this);
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(arg0==calu){
String m1Text=m1.getText().toString();
String m2Text=m2.getText().toString();
int m1Num=Integer.parseInt(m1Text);
int m2Num=Integer.parseInt(m2Text);
String resultText=String.valueOf(m1Num*m2Num);
result.setText(resultText);

//实现一个传递的Intent
Intent intent =new Intent();
intent.putExtra("m1", m1Text);
intent.putExtra("m2", m2Text);
intent.setClass(this, ResultActivity.class);
this.startActivity(intent);
}
}
}

ResultActivity.java

public class ResultActivity extends Activity{

public TextView result;
public void onCreate(Bundle bundle){
super.onCreate(bundle);
setContentView(R.layout.result);

result=(TextView)this.findViewById(R.id.result);
parseIntent();
}
public void parseIntent(){
//得到传递的Intent
Intent intent=this.getIntent();
//得到传递的Intent的参数
String m1Text=intent.getExtras().getString("m1");
String m2Text=intent.getExtras().getString("m2");
int m1Num=Integer.parseInt(m1Text);
int m2Num=Integer.parseInt(m2Text);
String resultText=String.valueOf(m1Num*m2Num);
//对目标结果的显示
result.setText(resultText);

}

}

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/m1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
></EditText>

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@+string/cul"
/>
<EditText android:id="@+id/m2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
></EditText>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@+string/equlas"
/>
<EditText android:id="@+id/result"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
></EditText>
<Button android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@+string/caluate"
android:id="@+id/calu"
> </Button>
</LinearLayout>

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