接触android这么久了。还没有真正的浩浩看看android拍照,相册图片剪切到底是怎么回事,每次都是从别人的代码一扣,就过来了。其实,谷歌提供的API已经很强大。只需要用的好,就那么几句就可以搞定神秘的拍照和剪切图片。废话不多少,直接看源码
package com.example.testcamera; import java.io.FileNotFoundException; 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.provider.MediaStore; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends Activity implements OnClickListener { private Button btnc, btnp; private ImageView img; private Intent intent; private final int dataFromCamera = 1; private final int dataFromAlbum = 2; private final int cropFromCamera = 3; private final int cropFromAlbum = 4; private Uri mUri = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { btnc = (Button) findViewById(R.id.btnc); btnp = (Button) findViewById(R.id.btnp); img = (ImageView) findViewById(R.id.img); btnc.setOnClickListener(this); btnp.setOnClickListener(this); } @Override public void onClick(View v) { int id = v.getId(); switch (id) { case R.id.btnc: openCamera(); break; case R.id.btnp: openPhoto(); break; default: break; } } private void openCamera() { intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, dataFromCamera); } private void openPhoto() { intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType("image/*"); startActivityForResult(intent, dataFromAlbum); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == RESULT_OK) { Uri uri = null; if (data.getData() != null) { uri = data.getData(); mUri = uri; } switch (requestCode) { case dataFromCamera: cropImageUri(uri, 800, 600, cropFromCamera); break; case dataFromAlbum: cropImageUri(uri, 800, 600, cropFromAlbum); break; case cropFromCamera: if (mUri != null) { Bitmap bitmap = decodeUriAsBitmap(mUri); img.setImageBitmap(bitmap); } break; case cropFromAlbum: if (mUri != null) { Bitmap bitmap = decodeUriAsBitmap(mUri); img.setImageBitmap(bitmap); } break; default: break; } } } private void cropImageUri(Uri uri, int outputX, int outputY, int requestCode) { Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); intent.putExtra("crop", "true"); intent.putExtra("aspectX", 4); intent.putExtra("aspectY", 3); intent.putExtra("outputX", outputX); intent.putExtra("outputY", outputY); intent.putExtra("scale", true); intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); intent.putExtra("return-data", false); intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString()); intent.putExtra("noFaceDetection", true); // no face detection startActivityForResult(intent, requestCode); } private Bitmap decodeUriAsBitmap(Uri uri) { Bitmap bitmap = null; try { bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri)); } catch (FileNotFoundException e) { e.printStackTrace(); return null; } return bitmap; } }
xml布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/btnc" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@android:color/holo_purple" android:text="拍照" android:textColor="@android:color/white" /> <Button android:id="@+id/btnp" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@android:color/holo_orange_dark" android:text="从相册中选取" android:textColor="@android:color/white" /> <ImageView android:id="@+id/img" android:layout_width="300dp" android:layout_height="300dp" android:layout_gravity="center_horizontal" android:layout_marginTop="50dp" /> </LinearLayout>
mainfest.xml文件
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.testcamera" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="18" /> <uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> <uses-feature android:name="android.hardware.camera.autofocus" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".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> </manifest>
注意要配置权限呀。