一、依照向导创建一个project,layout的activity_main.xml文件内容例如以下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="意向传參数測试" /> </RelativeLayout>
1)android:layout_width="match_parent" :谷歌把fill_parent改成了与实际效果更符合的match_parent,表示塞满容器,塞的意思就是有多少空间,占用多少空间
2)android:layout_height="wrap_content" :设置为wrap_content将完整显示其内部的文本和图像。布局元素将依据内容更改大小。
设置一个视图的尺寸为wrap_content大体等同于设置Windows控件的Autosize属性为True。
3)android:text :设置button的显示值
二、在Main函数做意向传參跳转
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button)this.findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub <span style="color:#ff0000;"> Intent intent = new Intent(MainActivity.this,OtherActivity.class); intent.putExtra("name", "Deng"); intent.putExtra("age", 23); startActivity(intent);</span> } }); }
通过startActivity方法启动
三、新建一个other.xml 和 OtherActivity.class
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/msg" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout>
public class OtherActivity extends Activity { private TextView textview; public OtherActivity(){ } protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.other); textview = (TextView)this.findViewById(R.id.msg); <span style="color:#ff0000;">Intent intent = getIntent();</span> <span style="color:#ff0000;">String name = intent.getStringExtra("name"); int age = intent.getIntExtra("age", 0);</span> textview.setText("name"+name+";"+"age"+age); } }
记得重写onCreate方法以及设置setContentView布局
四、最后在文件AndroidManifest.xml加入一个activity标签
<application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.android_intent.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <span style="color:#ff0000;"> <activity android:name = ".OtherActivity" /></span> </application>