第一章:初入Android大门(不同的Activity之间的数据传递与回调--setActivityForResult) -

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第一章:初入Android大门(不同的Activity之间的数据传递与回调--setActivityForResult)

Android XML OS

从数据Activity传递至Activity2这样的做发可以恢复User输入数据,当然也可以采用Bundle方式再传递一次也可以但是这样感觉很别扭。
效果:

直接看代码
main.xml


<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
 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/heigths"
android:layout_width="129px"
android:layout_height="wrap_content"
android:textSize="18sp"
android:layout_x="122px"
android:layout_y="141px"
>
</EditText>
<RadioGroup android:id="@+id/sexs"
        android:layout_width="wrap_content"
		android:layout_x="122px"
		android:orientation="horizontal"
		android:layout_y="87px"
        android:layout_height="wrap_content">
<RadioButton
android:id="@+id/boy"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="&#30007;"
>
</RadioButton>
<RadioButton
android:id="@+id/gril"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="&#22899;"
>
</RadioButton>
</RadioGroup>
<TextView
android:id="@+id/sexText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="&#24615;&#21035;:"
android:layout_x="51px"
android:layout_y="102px"
>
</TextView>
<TextView
android:id="@+id/heigth"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="&#36523;&#39640;:"
android:layout_x="51px"
android:layout_y="152px"
>
</TextView>
<Button
android:id="@+id/count"
android:layout_width="74px"
android:layout_height="wrap_content"
android:text="&#35745;&#31639;"
android:layout_x="140px"
android:layout_y="203px"
>
</Button>
</AbsoluteLayout>

layout2.xml

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="&#24615;&#21035;:"
android:layout_x="74px"
android:layout_y="106px"
>
</TextView>
<Button
android:id="@+id/back"
android:layout_width="74px"
android:layout_height="wrap_content"
android:text="@string/back"
android:layout_x="140px"
android:layout_y="203px"
>
</Button>

</AbsoluteLayout>

strings.xml


<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, BackTransferData!</string>
      <string name="back">返回</string>
    <string name="app_name">BackTransferData</string>
</resources>

AndroidManifest.xml


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="back.transfer.data"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".BackTransferData"
                  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=".BackTransferData2"></activity>
    </application>
</manifest>

R.java

/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */

package back.transfer.data;

public final class R {
    public static final class attr {
    }
    public static final class drawable {
        public static final int icon=0x7f020000;
    }
    public static final class id {
        public static final int back=0x7f050001;
        public static final int boy=0x7f050004;
        public static final int count=0x7f050008;
        public static final int gril=0x7f050005;
        public static final int heigth=0x7f050007;
        public static final int heigths=0x7f050002;
        public static final int sexText=0x7f050006;
        public static final int sexs=0x7f050003;
        public static final int text=0x7f050000;
    }
    public static final class layout {
        public static final int layout2=0x7f030000;
        public static final int main=0x7f030001;
    }
    public static final class string {
        public static final int app_name=0x7f040002;
        public static final int back=0x7f040001;
        public static final int hello=0x7f040000;
    }
}

BackTransferData.java


package back.transfer.data;

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.RadioButton;

public class BackTransferData extends Activity {
    /** Called when the activity is first created. */
	private Button bt;
	EditText et;
	private RadioButton rb;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /**载入main.xml*/
        setContentView(R.layout.main);
        /**找到文本框*/
        et=(EditText)findViewById(R.id.heigths);
        /**找到计算按钮*/
        bt=(Button)findViewById(R.id.count);
        /**设置按钮的监听事件*/
        bt.setOnClickListener(new Button.OnClickListener(){
        	public void onClick(View v){
        		/**判断是否被选中*/
        		String sex="女";
        		rb=(RadioButton)findViewById(R.id.boy);
        		if(rb.isChecked()){
        			sex="男";
        		}
        		/**把取得的字符串转换成double类型*/
        		double height=Double.parseDouble((et.getText()).toString());
        		/**实例化Bundle对像,把将要传递的数据以键值对的形式添加进去*/
        		Bundle bundle=new Bundle();
        		/**添加的是Double类型的数值*/
        		bundle.putDouble("height", height);
        		/**添加的是String类型的数值*/
        		bundle.putString("sex", sex);
        		/**实例化Intent对像,并指定传递的class*/
        		Intent intent=new Intent();
        		intent.setClass(BackTransferData.this, BackTransferData2.class);
        		/**将设置好值的Bundle对象添加进Intent*/
        		intent.putExtras(bundle);
        		/**调用TransferData2 其中startActivityForResult(intent, 0)的0代表下一个要传递Activity要返回的数据可以自定义*/
        		startActivityForResult(intent, 0);
        	}
        });
    }
    
    /**覆盖onActivityResult方法*/
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		/**取得Bundle对象*/
		Bundle bundle=data.getExtras();
		/**取得对应sex键的值*/
		String sex=bundle.getString("sex");
		/**取得对应height键的值*/
		double height=bundle.getDouble("height");
		/**设置哪个RadioButton按钮被选中*/
		RadioButton rb2=(RadioButton)findViewById(R.id.gril);
		et.setText(""+height);
		if(sex.equals("男")){
			rb.setChecked(true);
		}else{
			rb2.setChecked(true);
		}
	}
    
    
}

BackTransferData2.java


package back.transfer.data;

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

public class BackTransferData2 extends Activity {
    /** Called when the activity is first created. */
	private Button bt;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /**载入layout2.xml*/
        setContentView(R.layout.layout2);
        /**找到TextView*/
        TextView text=(TextView)findViewById(R.id.text);
        /**获取Bundle*/
        Bundle bundle=this.getIntent().getExtras();
        /**对TextView设值*/
        text.setText("性别:"+bundle.getString("sex")+"\n身高:"+bundle.getDouble("height"));
        /**找到Button*/
        bt=(Button)findViewById(R.id.back);
        /**设置bt按钮的监听事件*/
        bt.setOnClickListener(new Button.OnClickListener(){
        	public void onClick(View v){
        		/**返回results回上一个activity*/
        		BackTransferData2.this.setResult(RESULT_OK,BackTransferData2.this.getIntent());
        		/**结束当前activity*/
        		BackTransferData2.this.finish();
        	}
        });
    }
}