Intent的基本作用
一个Intent对象包含了一组信息
1，Component name
2，Action
3，Data
4，Category
5，Extras
6，Flags
第一个 Activity: Android02Activity
package com.org;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Android02Activity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//布局
setContentView(R.layout.main);
//取得Button对象
Button btn = (Button)findViewById(R.id.mybtn);
btn.setText("点击");
//btn注册事件
btn.setOnClickListener(new MyBtnListener());
}
class MyBtnListener implements OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//生成一个intent对象
Intent intent = new Intent();
//intent传递数据
intent.putExtra("name", "jingjing");
intent.setClass(Android02Activity.this, OtherActivity.class);
//启动intent
Android02Activity.this.startActivity(intent);
//发送短信
/*Uri uri = Uri.parse("smsto://0800000123");
Intent intent = new Intent(Intent.ACTION_SENDTO,uri);
intent.putExtra("name", "lisi");
startActivity(intent);*/
}
}
}
第二个Activity: OtherActivity
package com.org;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class OtherActivity extends Activity {
private TextView text ;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
// 如果是R.layout.main 提示错误
setContentView(R.layout.other);
Intent intent = getIntent();
String name = intent.getStringExtra("name");
text = (TextView)findViewById(R.id.mytext);
text.setText(name);
}
}
Android02Activity的布局文件 main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
OtherActivity的布局文件 other.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
最后要在AndroidManifest.xml文件中注册 Activity
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:andro
package="com.org"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Android02Activity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- 注册Activity -->
<activity android:name=".OtherActivity"
android:label="@string/other">
</activity>
</application>
</manifest>
不然会报异常