Android 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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