Android 实现调用系统拍照相册，剪切功能

1.XML布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.administrator.myapplication.MainActivity">

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="hello" />

    <ImageView
        android:id="@+id/imageID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"
        android:maxHeight="50dip"
        android:maxWidth="50dip" />

    <Button
        android:id="@+id/btn_01"
        android:layout_width="150dip"
        android:layout_height="50dip"
        android:text="相册" />

    <Button
        android:id="@+id/btn_02"
        android:layout_width="150dip"
        android:layout_height="50dip"
        android:text="拍照" />
</LinearLayout>

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