做照片相框
步骤就是跟美图秀秀一样，先截图，然后添加相框
在之前Bitmap.createBitmap那个文里，说过使用jpg图片会挡住底层图片，用画这种方法合成图片，没有问题。
public class MainActivity extends Activity implements OnClickListener{
private static final String TAG = "blueweb";
private LinearLayout layout_btnGroup;
private int paintY;// layout_btnGroup高度
private Button selectImageBtn;
private Button cutImageBtn;
private Button btn_ouerlay;
private ImageView imageView;
private Bitmap cutBmp;// 裁剪得到的Bitmap
private Bitmap chooseBmp;// 选择相框的Bitmap
private Canvas canvas;
private Paint paint;
private boolean onePicked = false;
private boolean twoPicked = false;
private static final int IMAGE_SELECT = 1;
private static final int IMAGE_CUT = 2;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
layout_btnGroup = (LinearLayout) findViewById(R.id.layout_btnGroup);
selectImageBtn = (Button) findViewById(R.id.btn_chooseimg);
cutImageBtn = (Button) findViewById(R.id.btn_cutimg);
btn_ouerlay = (Button) findViewById(R.id.btn_addoverlay);
imageView = (ImageView) findViewById(R.id.image);
selectImageBtn.setOnClickListener(this);
cutImageBtn.setOnClickListener(this);
btn_ouerlay.setOnClickListener(this);
paintY = layout_btnGroup.getHeight();
}
public void onClick(View v) {
Intent intent;
switch(v.getId()){
case R.id.btn_chooseimg:
intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, IMAGE_SELECT);
break;
case R.id.btn_cutimg:
intent = getImageClipIntent();
startActivityForResult(intent, IMAGE_CUT);
break;
case R.id.btn_addoverlay:
Toast.makeText(this, "点击了Btn", Toast.LENGTH_SHORT).show();
chooseBmp = BitmapFactory.decodeResource(getResources(), R.drawable.img_overlay);
if (chooseBmp != null){
twoPicked = true;
if (onePicked == true && twoPicked == true){
Bitmap drawingBitmap = Bitmap.createBitmap(cutBmp.getWidth(), cutBmp.getHeight(), cutBmp.getConfig());
canvas = new Canvas(drawingBitmap);
paint = new Paint();
canvas.drawBitmap(cutBmp, 0, paintY, paint);
paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.MULTIPLY));
canvas.drawBitmap(chooseBmp, 0, paintY, paint);
Log.d(TAG, paintY + "");
imageView.setImageBitmap(drawingBitmap);
}
}else {
Toast.makeText(this, "添加相框失败", Toast.LENGTH_SHORT).show();
}
break;
}
}
/**
* 获取剪切后的图片
*/
public static Intent getImageClipIntent() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
intent.setType("image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);//裁剪框比例
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 200);//输出图片大小
intent.putExtra("outputY", 300);
intent.putExtra("return-data", true);
return intent;
}
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
if(resultCode == RESULT_OK){
if(requestCode == IMAGE_SELECT){
Uri imageFileUri = intent.getData();
int dw=getWindowManager().getDefaultDisplay().getWidth();
int dh=getWindowManager().getDefaultDisplay().getHeight()/2;
//已屏幕宽 和一般的高作为图片显示的最大尺寸
try{
BitmapFactory.Options factory = new BitmapFactory.Options();
factory.inJustDecodeBounds = true; //当为true时 允许查询图片不为 图片像素分配内存
cutBmp = BitmapFactory.decodeStream(getContentResolver()
.openInputStream(imageFileUri),null,factory);
int hRatio = (int)Math.ceil(factory.outHeight/(float)dh); //图片是高度的几倍
int wRatio = (int)Math.ceil(factory.outWidth/(float)dw); //图片是宽度的几倍
System.out.println("hRatio:"+hRatio+" wRatio:"+wRatio);
//缩小到 1/ratio的尺寸和 1/ratio^2的像素
if(hRatio>1 || wRatio>1){
if(hRatio > wRatio){
factory.inSampleSize = hRatio;
}
else
factory.inSampleSize = wRatio;
}
factory.inJustDecodeBounds = false;
cutBmp = BitmapFactory.decodeStream(getContentResolver()
.openInputStream(imageFileUri),null,factory);
if (cutBmp != null){
onePicked = true;
imageView.setImageBitmap(cutBmp);
}else {
Toast.makeText(this, "选择图片失败", Toast.LENGTH_SHORT).show();
}
}catch(Exception ex){
}
}
else if(requestCode == IMAGE_CUT){
cutBmp = intent.getParcelableExtra("data");
if (cutBmp != null){
onePicked = true;
imageView.setImageBitmap(cutBmp);
}else {
Toast.makeText(this, "获取裁剪图片失败", Toast.LENGTH_SHORT).show();
}
}
}
}
}
布局文件
xmlns:tools="/tools"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity" >
android:id="@+id/layout_btnGroup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
android:id="@+id/btn_chooseimg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="选择图片" />
android:id="@+id/btn_cutimg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="选择图片裁剪" />
android:id="@+id/btn_addoverlay"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="添加相框" />
android:layout_weight="1"
android:id="@+id/image"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher" />
先点击选择图片裁剪，然后点击添加相框。效果如下，只是做了基本的原理，以后有时间会改一下代码再更新
