[读书摘记]不同Activity之间的数据传递--Bundle对像的实现

通过Bundle封装，接收程序接收后解封，直接引用书中例子，不多说了，看代码吧：

 

EX03_10.java

package irdc.ex03_10; import android.app.Activity; import android.os.Bundle; import android.widget.Button; import android.view.View; import android.widget.EditText; import android.widget.RadioButton; import android.content.Intent; public class EX03_10 extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button b1 = (Button) findViewById(R.id.button1); b1.setOnClickListener( new Button.OnClickListener() { public void onClick(View v) { EditText et = (EditText) findViewById(R.id.height); double height = Double.parseDouble(et.getText().toString()); String sex = ""; RadioButton rb1 = (RadioButton) findViewById(R.id.sex1); if(rb1.isChecked()) { sex = "M"; } else { sex = "F"; } //System.out.print(sex); Intent intent = new Intent(); //System.out.print("new Intent"); intent.setClass(EX03_10.this, EX03_10_1.class); //System.out.print("setClass OK"); Bundle bundle = new Bundle(); bundle.putDouble("height", height); //System.out.print("PutDouble Ok"); bundle.putString("sex", sex); //System.out.print("PUtString OK"); intent.putExtras(bundle); //System.out.print("pubExtras OK"); startActivity(intent); //System.out.print("Start OK"); } } ); } } 

 

EX03_10_1.java

package irdc.ex03_10; import android.app.Activity; import android.os.Bundle; import android.content.Intent; import java.text.DecimalFormat; import java.text.NumberFormat; import android.widget.TextView; public class EX03_10_1 extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mylayout); Bundle bundle = this.getIntent().getExtras(); String sex = bundle.getString("sex"); double height = bundle.getDouble("height"); String setText = ""; if(sex.equals("M")) { setText = "男性"; } else { setText = "女性"; } TextView tv1 = (TextView) findViewById(R.id.text1); tv1.setText(setText + format(height)); } private String format(double m) { NumberFormat formatter = new DecimalFormat("0.00"); String s = formatter.format(m); return s; } }  

 

main.xml

<?xml version="1.0" encoding="utf-8"?> <AbsoluteLayout android:id="@+id/widget0" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android" > <TextView android:id="@+id/title" android:layout_width="243px" android:layout_height="29px" android:text="@string/title" android:textSize="24sp" android:layout_x="36px" android:layout_y="32px" > </TextView> <TextView android:id="@+id/text1" android:layout_width="wrap_content" android:layout_height="37px" android:text="@string/text1" android:textSize="18sp" android:layout_x="40px" android:layout_y="156px" > </TextView> <TextView android:id="@+id/text2" android:layout_width="wrap_content" android:layout_height="29px" android:text="@string/text2" android:textSize="18sp" android:layout_x="40px" android:layout_y="102px" > </TextView> <TextView android:id="@+id/text3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="cm" android:textSize="18sp" android:layout_x="231px" android:layout_y="157px" > </TextView> <Button android:id="@+id/button1" android:layout_width="70px" android:layout_height="48px" android:layout_x="130px" android:layout_y="232px" android:text="计算"> </Button> <RadioGroup android:id="@+id/sex" android:layout_width="300px" android:layout_height="100px" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_x="97px" android:layout_y="98px" android:orientation="horizontal" android:checkedButton="@+id/sex1" > <RadioButton android:id="@+id/sex1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="男的" > </RadioButton> <RadioButton android:id="@+id/sex2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="女的" > </RadioButton> </RadioGroup> <EditText android:id="@+id/height" android:layout_width="130px" android:layout_height="wrap_content" android:textSize="18sp" android:layout_x="96px" android:layout_y="142px" android:numeric="decimal" > </EditText> </AbsoluteLayout> 

 

mylayout.xml

<?xml version="1.0" encoding="utf-8"?> <AbsoluteLayout android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android" > <TextView android:id="@+id/text1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:layout_x="50px" android:layout_y="72px" > </TextView> </AbsoluteLayout> 

 

自己动手敲下了所有代码，但在运行时一点“计算”就出错，后来总没找到原因，直到后来重新更新了main.xml才得以解决，具体原因也不得而知，我个人认为应该是在布局上出现了错误，以后在对Raidogroup处理的时候要小心一些了。