package com.android.camera;import android.content.Context; import android.util.AttributeSet; import android.widget.ImageView;/** * A button designed to be used for the on-screen shutter button. * It's currently an {@code ImageView} that can call a delegate when the * pressed state changes. */ public class ShutterButton extends ImageView { /** * A callback to be invoked when a ShutterButton's pressed state changes. */ public interface OnShutterButtonListener { /** * Called when a ShutterButton has been pressed. * * @param b The ShutterButton that was pressed. */ void onShutterButtonFocus(ShutterButton b, boolean pressed); void onShutterButtonClick(ShutterButton b); } private OnShutterButtonListener mListener; private boolean mOldPressed; public ShutterButton(Context context) { super(context); } public ShutterButton(Context context, AttributeSet attrs) { super(context, attrs); } public ShutterButton(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public void setOnShutterButtonListener(OnShutterButtonListener listener) { mListener = listener; } /** * Hook into the drawable state changing to get changes to isPressed -- the * onPressed listener doesn't always get called when the pressed state * changes. */ @Override protected void drawableStateChanged() { super.drawableStateChanged(); final boolean pressed = isPressed(); if (pressed != mOldPressed) { if (!pressed) { // When pressing the physical camera button the sequence of // events is: // focus pressed, optional camera pressed, focus released. // We want to emulate this sequence of events with the shutter // button. When clicking using a trackball button, the view // system changes the the drawable state before posting click // notification, so the sequence of events is: // pressed(true), optional click, pressed(false) // When clicking using touch events, the view system changes the // drawable state after posting click notification, so the // sequence of events is: // pressed(true), pressed(false), optional click // Since we're emulating the physical camera button, we want to // have the same order of events. So we want the optional click // callback to be delivered before the pressed(false) callback. // // To do this, we delay the posting of the pressed(false) event // slightly by pushing it on the event queue. This moves it // after the optional click notification, so our client always // sees events in this sequence: // pressed(true), optional click, pressed(false) post(new Runnable() { public void run() { callShutterButtonFocus(pressed); } }); } else { callShutterButtonFocus(pressed); } mOldPressed = pressed; } } private void callShutterButtonFocus(boolean pressed) { if (mListener != null) { mListener.onShutterButtonFocus(this, pressed); } } @Override public boolean performClick() { boolean result = super.performClick(); if (mListener != null) { mListener.onShutterButtonClick(this); } return result; } }
我是想打开应用的时候就调用相机,然后拍照保存退出。我刚入门,不太了解takepicture怎么用
我是想打开应用的时候就调用相机,然后拍照保存退出。我刚入门,不太了解takepicture怎么用
我是想打开应用的时候就调用相机,然后拍照保存退出。我刚入门,不太了解takepicture怎么用http://developer.android.com/reference/android/hardware/Camera.html class overview这段有To take pictures with this class, use the following steps:,要多看api啊
package com.android.camera;import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;/**
* A button designed to be used for the on-screen shutter button.
* It's currently an {@code ImageView} that can call a delegate when the
* pressed state changes.
*/
public class ShutterButton extends ImageView {
/**
* A callback to be invoked when a ShutterButton's pressed state changes.
*/
public interface OnShutterButtonListener {
/**
* Called when a ShutterButton has been pressed.
*
* @param b The ShutterButton that was pressed.
*/
void onShutterButtonFocus(ShutterButton b, boolean pressed);
void onShutterButtonClick(ShutterButton b);
} private OnShutterButtonListener mListener;
private boolean mOldPressed; public ShutterButton(Context context) {
super(context);
} public ShutterButton(Context context, AttributeSet attrs) {
super(context, attrs);
} public ShutterButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
} public void setOnShutterButtonListener(OnShutterButtonListener listener) {
mListener = listener;
} /**
* Hook into the drawable state changing to get changes to isPressed -- the
* onPressed listener doesn't always get called when the pressed state
* changes.
*/
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
final boolean pressed = isPressed();
if (pressed != mOldPressed) {
if (!pressed) {
// When pressing the physical camera button the sequence of
// events is:
// focus pressed, optional camera pressed, focus released.
// We want to emulate this sequence of events with the shutter
// button. When clicking using a trackball button, the view
// system changes the the drawable state before posting click
// notification, so the sequence of events is:
// pressed(true), optional click, pressed(false)
// When clicking using touch events, the view system changes the
// drawable state after posting click notification, so the
// sequence of events is:
// pressed(true), pressed(false), optional click
// Since we're emulating the physical camera button, we want to
// have the same order of events. So we want the optional click
// callback to be delivered before the pressed(false) callback.
//
// To do this, we delay the posting of the pressed(false) event
// slightly by pushing it on the event queue. This moves it
// after the optional click notification, so our client always
// sees events in this sequence:
// pressed(true), optional click, pressed(false)
post(new Runnable() {
public void run() {
callShutterButtonFocus(pressed);
}
});
} else {
callShutterButtonFocus(pressed);
}
mOldPressed = pressed;
}
} private void callShutterButtonFocus(boolean pressed) {
if (mListener != null) {
mListener.onShutterButtonFocus(this, pressed);
}
} @Override
public boolean performClick() {
boolean result = super.performClick();
if (mListener != null) {
mListener.onShutterButtonClick(this);
}
return result;
}
}
我是想打开应用的时候就调用相机,然后拍照保存退出。我刚入门,不太了解takepicture怎么用
我是想打开应用的时候就调用相机,然后拍照保存退出。我刚入门,不太了解takepicture怎么用http://developer.android.com/reference/android/hardware/Camera.html
class overview这段有To take pictures with this class, use the following steps:,要多看api啊