菜鸟学习日志4.Intent与Activity

作为一个Android端的应用，多个Activity当然是避免不了的，我们该如何在多个Activity中跳转呢，这里就用到了Intent

下面我用一个按钮的响应跳转为例

先新建一个工程，这里我命名为IntentTest

在布局文件main里添加一个Button控件

代码如下

main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >  <Button      android:id="@+id/myButton"     android:layout_width="fill_parent"     android:layout_height="wrap_content"       />  </LinearLayout>

然后在主程序上设置按键的触发

完整代码为

MainActivity.java

package com.example.intenttest;import android.support.v7.app.ActionBarActivity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity {    private Button myButton = null;         @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         myButton = (Button)findViewById(R.id.myButton);         myButton.setText("启动开关");         myButton.setOnClickListener(new MyButtonListener());     }             class MyButtonListener implements OnClickListener{          public void onClick(View v) {             // TODO Auto-generated method stub              //生成一Intent对象              Intent intent = new Intent();             intent.setClass(MainActivity.this,otherActivity.class);             MainActivity.this.startActivity(intent);         }                      }   }

编写另外一个Activity

package com.example.intenttest;import android.app.Activity; import android.os.Bundle; import android.widget.TextView;   public class otherActivity extends Activity{     private TextView myTextView = null;     @Override     protected void onCreate(Bundle savedInstanceState) {         // TODO Auto-generated method stub          super.onCreate(savedInstanceState);         setContentView(R.layout.other);         myTextView = (TextView)findViewById(R.id.myTextView);         myTextView.setText(R.string.other);     }       } 

对otherActivity的布局设计

<?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/myTextView"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     /> </LinearLayout>

当编写一个新的Activity  需在AndroidManifest中进行注册：

位置在</activity>和</application>之间

代码如下

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.intenttest"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="21" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".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>        <activity  android:name=".otherActivity" android:label="@string/other"/>    </application><pre name="code" class="html">

</manifest>

以及在value文件夹下的string.xml添加

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">IntentTest</string>    <string name="hello_world">Hello world!</string>    <string name="action_settings">Settings</string>    <string name="other">otherActivity</string></resources>

结果