111 lines
4.1 KiB
Java
111 lines
4.1 KiB
Java
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.widget;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.MotionEvent;
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import android.view.KeyEvent;
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import android.widget.RemoteViews.RemoteView;
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/**
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* Represents a push-button widget. Push-buttons can be
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* pressed, or clicked, by the user to perform an action.
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* <p>A typical use of a push-button in an activity would be the following:
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* </p>
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*
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* <pre>
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* public class MyActivity extends Activity {
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* protected void onCreate(Bundle icicle) {
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* super.onCreate(icicle);
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*
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* setContentView(R.layout.content_layout_id);
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*
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* final Button button = (Button) findViewById(R.id.button_id);
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* button.setOnClickListener(new View.OnClickListener() {
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* public void onClick(View v) {
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* // Perform action on click
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* }
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* });
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* }
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* }</pre>
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*
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* <p>However, instead of applying an {@link android.view.View.OnClickListener OnClickListener} to
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* the button in your activity, you can assign a method to your button in the XML layout,
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* using the {@link android.R.attr#onClick android:onClick} attribute. For example:</p>
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*
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* <pre>
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* <Button
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* android:layout_height="wrap_content"
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* android:layout_width="wrap_content"
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* android:text="@string/self_destruct"
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* android:onClick="selfDestruct" /></pre>
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*
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* <p>Now, when a user clicks the button, the Android system calls the activity's {@code
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* selfDestruct(View)} method. In order for this to work, the method must be public and accept
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* a {@link android.view.View} as its only parameter. For example:</p>
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*
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* <pre>
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* public void selfDestruct(View view) {
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* // Kabloey
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* }</pre>
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*
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* <p>The {@link android.view.View} passed into the method is a reference to the widget
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* that was clicked.</p>
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*
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* <h3>Button style</h3>
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*
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* <p>Every Button is styled using the system's default button background, which is often different
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* from one device to another and from one version of the platform to another. If you're not
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* satisfied with the default button style and want to customize it to match the design of your
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* application, then you can replace the button's background image with a <a
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* href="{@docRoot}guide/topics/resources/drawable-resource.html#StateList">state list drawable</a>.
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* A state list drawable is a drawable resource defined in XML that changes its image based on
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* the current state of the button. Once you've defined a state list drawable in XML, you can apply
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* it to your Button with the {@link android.R.attr#background android:background}
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* attribute. For more information and an example, see <a
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* href="{@docRoot}guide/topics/resources/drawable-resource.html#StateList">State List
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* Drawable</a>.</p>
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*
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* <p>Also see the <a href="{@docRoot}resources/tutorials/views/hello-formstuff.html">Form Stuff
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* tutorial</a> for an example implementation of a button.</p>
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*
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* <p><strong>XML attributes</strong></p>
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* <p>
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* See {@link android.R.styleable#Button Button Attributes},
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* {@link android.R.styleable#TextView TextView Attributes},
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* {@link android.R.styleable#View View Attributes}
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* </p>
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*/
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@RemoteView
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public class Button extends TextView {
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public Button(Context context) {
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this(context, null);
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}
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public Button(Context context, AttributeSet attrs) {
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this(context, attrs, com.android.internal.R.attr.buttonStyle);
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}
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public Button(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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}
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}
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