使用内置的Camera 应用程序捕获图像
探索Android 所提供的内置功能,内置的图像捕获与存储功能为Android 上全部媒体功能提供了一个非常好的切入点,为我们在以后的章节中处理音频和视频奠定了基础。
如今介绍怎样利用内置的Camera(摄像头)应用程序。
package com.example; import java.io.File; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.view.Display; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends Activity { final static int CAMERA_RESULT = 0; ImageView imv; Button but; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_main); findViewById();
but.setOnClickListener(new OnClickListener() { public void onClick(View v) {
/*运行Camera内置摄像头意图*/ Intent i = new Intent( android.provider.MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(i, CAMERA_RESULT); } }); } private void findViewById() { but = (Button) findViewById(R.id.but); imv = (ImageView) findViewById(R.id.img); } /* 当activity运行完后,就显示照片*/
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == RESULT_OK) { Bundle bundle = data.getExtras(); Bitmap bmp = (Bitmap) bundle.get("data"); imv.setImageBitmap(bmp); } } }
<application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" > <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerInParent="true" /> <Button android:id="@+id/but" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/img" android:layout_centerInParent="true" android:text="take_a_picture"/> </RelativeLayout>