android學習計劃

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1、首先學習活動與意圖，活動之間的互動。傳遞資料，接受結果。

 

附上一個最簡單的例子

 

在這個簡單到無法更簡單的例子中，最重要的檔案就是UsingIntentActivity.java與SecondActivity.java檔案以及AndroidManifest設定檔。

附上簡單的代碼

package com.example.usingintent;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.content.Intent;public class UsingIntentActivity extends ActionBarActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.using_intent, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }    public void onClick(View view){        startActivity(new Intent("com.example.usingintent.SecondActivity"));    }}

package com.example.usingintent;import android.app.Activity;import android.os.Bundle;public class SecondActivity extends Activity{    @Override    public void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        setContentView(R.layout.secondactivity);    }}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.usingintent"    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=".UsingIntentActivity"            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=".SecondActivity"            android:label="Second Activity" >            <intent-filter>                <action android:name="com.example.usingintent.SecondActivity" />                <category android:name="android.intent.category.DEFAULT" />            </intent-filter>        </activity>    </application></manifest>

注意activity的包的寫法。

android學習計劃