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| | + | == Activities == |
| | + | === Android - Neue Activity anlegen und starten === |
| | + | [[Android - Neue Activity]] |
| | Lock Portrait or Lanscape | | Lock Portrait or Lanscape |
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| | Bitmap - ressource und input stream | | Bitmap - ressource und input stream |
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| − | == Neue Activity starten ==
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| − | Z.B. über Button Klick
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| − | Du brauchst:
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| − | * Neue Activity
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| − | **Evtl. neues Layout anlegen
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| − | **Neue Java Klasse für Activity anlegen
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| − | ** Neue Activity im Manifest eintragen
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| − | * Button in der Haupt Activity
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| − | * onClick Event Handler
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| − | * Intent als Verbindung
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| − | * Ressourcen wie Strings etc.
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| − | === Neues Layout für die Activity ===
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| − | Layout Ordner > Rechtsklick > New > Android Layout File > Name in Lowercase(z.b. page_2)
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| − | <pre>
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| − | <?xml version="1.0" encoding="utf-8"?>
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| − | <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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| − | android:layout_width="match_parent"
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| − | android:layout_height="match_parent"
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| − | android:orientation="vertical" >
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| − | <TextView
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| − | android:id="@+id/textView1"
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| − | android:layout_width="wrap_content"
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| − | android:layout_height="wrap_content"
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| − | android:text="@string/page2_title"
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| − | android:textAppearance="?android:attr/textAppearanceLarge" />
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| − | </LinearLayout>
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| − | </pre>
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| − |
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| − | === Neue Activity Klasse erzeugen ===
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| − | Package > Rechtsklick > New > Class > Name mit FirstLetterUppercase (z.B. Page2Activity)
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| − | * extends Activity
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| − | * Activity importieren
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| − | * mind. onCreate(bundle) -> am Besten über Rechtsklick > Source > Override
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| − | * setcontentView(R.layout.id)
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| − | '''page2Activity.class'''
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| − | <pre>
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| − | package com.example.buttonstartsactivity;
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| − | import android.app.Activity;
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| − | import android.os.Bundle;
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| − | public class Page2Activity extends Activity{
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| − | @Override
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| − | protected void onCreate(Bundle savedInstanceState) {
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| − | super.onCreate(savedInstanceState);
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| − | setContentView(R.layout.page2);
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| − | }
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| − | }
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| − | </pre>
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| − |
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| − | === Manifest Eintrag ===
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| − | <pre>
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| − | // ...
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| − | <activity
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| − | android:name="com.example.buttonstartsactivity.Page2Activity"
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| − | android:label="@string/app_name"
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| − | android:exported="false">
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| − | <intent-filter>
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| − | <action android:name="android.intent.action.PAGE2" />
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| − | <category android:name="android.intent.category.DEFAULT" />
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| − | </intent-filter>
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| − | </activity>
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| − | // ...
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| − | </pre>
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| − |
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| − | === Button in Hauptansicht erstellen ===
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| − | z.B.
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| − | '''main_activtiy.xml'''
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| − | <pre>
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| − | <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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| − | xmlns:tools="http://schemas.android.com/tools"
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| − | android:layout_width="match_parent"
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| − | android:layout_height="match_parent"
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| − | tools:context=".MainActivity" >
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| − | <Button
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| − | android:id="@+id/button1"
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| − | android:layout_width="wrap_content"
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| − | android:layout_height="wrap_content"
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| − | android:layout_alignParentTop="true"
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| − | android:layout_centerHorizontal="true"
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| − | android:text="@string/button" />
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| − | </RelativeLayout>
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| − | </pre>
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| − |
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| − | === Button verbinden ===
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| − | '''MainActivity.java'''
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| − | <pre>
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| − | package de.webmynet.buttonstartsactivity;
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| − | import android.app.Activity;
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| − | import android.content.Intent;
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| − | import android.os.Bundle;
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| − | import android.view.Menu;
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| − | import android.view.View;
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| − | import android.widget.Button;
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| − | public class MainActivity extends Activity {
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| − | @Override
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| − | protected void onCreate(Bundle savedInstanceState) {
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| − | super.onCreate(savedInstanceState);
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| − | setContentView(R.layout.activity_main);
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| − | Button button1 = (Button) findViewById(R.id.button1);
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| − | button1.setOnClickListener(new View.OnClickListener() {
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| − | @Override
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| − | public void onClick(View v) {
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| − | //btw v is the view where the button is pressed - you can use it to retrieve data
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| − | startActivity(new Intent("de.webmynet.buttonstartsactivity.PAGE2"));
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| − | }
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| − | });
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| − | }
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| − | @Override
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| − | public boolean onCreateOptionsMenu(Menu menu) {
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| − | // Inflate the menu; this adds items to the action bar if it is present.
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| − | getMenuInflater().inflate(R.menu.activity_main, menu);
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| − | return true;
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| − | }
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| − | }
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| − | </pre>
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| − | === Variante onClick Event im Layout File ===
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| − | Anstatt der onClick Funktion kann man auch eine Funktion im Layout definieren. Dann kann man in der .java Datei einfach die Funktion implementieren.
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| − | activity_main.xml
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| − | <pre>
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| − | ...
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| − | <Button
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| − | android:layout_width="wrap_content"
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| − | android:layout_height="wrap_content"
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| − | android:text="@string/button"
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| − | android:onClick="buttonPressed" />
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| − | ...
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| − | </pre>
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| − | MainActivity.java
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| − | <pre>
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| − | /** Called when the user clicks the send button **/
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| − | public void buttonPressed(View view) {
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| − | Intent intent = new Intent(this, Page2Activity.class);
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| − | EditText editText = (EditText) findViewById(R.id.button);
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| − | startActivity(intent);
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| − | }
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| − | </pre>
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