目前我正在处理应用程序，其中我在按钮点击时翻转图像。但问题在于我正在使用来自xml的ImageView图像，这些图像是矩形格式。我想以圆形格式使用这些图像。
我在互联网上搜索这个问题，我发现大多数解决方案都使用Bitmap图像。
这意味着我需要以位图格式转换图像。我怎样才能转换这些。
注意： - 我正在使用Drawable文件夹中的图像。
我找到了这些解决方案，但不知道如何使用它们：
How to make an ImageView with rounded corners?
第二个：
How to create a circular ImageView in Android?
如何在我的应用中使用这些解决方案？
那么如何转换圆形图像？
这是我的MainActivity.java课程，我用它在按钮点击时翻转图像。
package com.example.image_changer;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Typeface;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.Handler;
import android.os.SystemClock;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.MediaController;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;
public class MainActivity extends Activity {
TextView textView;
ImageView imageView;
ImageView imageView1;
private long startTime = 0L;
private Handler customHandler = new Handler();
long timeInMillisecond = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;
Button button;
Button button2;
Button button3;
Button music;
boolean pause;
int flag=0;;
VideoView videoView;
MediaController mediaController;
MediaPlayer mp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// MainActivity.this.requestWindowFeature(Window.FEATURE_NO_TITLE);
// MainActivity.this.getWindow().setFlags(
// WindowManager.LayoutParams.FLAG_FULLSCREEN,
// WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
mp = new MediaPlayer();
mp= MediaPlayer.create(this, R.raw.instrumental);
textView = (TextView) findViewById(R.id.timerValue);
button = (Button) findViewById(R.id.button1);
button3 = (Button)findViewById(R.id.button2);
button2 = (Button) findViewById(R.id.pause);
music = (Button)findViewById(R.id.button3);
imageView1 = (ImageView) findViewById(R.id.imageView4);
videoView = (VideoView) findViewById(R.id.videoView1);
imageView1.buildDrawingCache();
Bitmap bmap = imageView1.getDrawingCache();
videoView.setVisibility(1);
imageView1.setVisibility(1);
mediaController = new MediaController(MainActivity.this);
// RelativeLayout relativeLayout = (RelativeLayout)
// findViewById(R.id.relativelayout);
// relativeLayout.setBackgroundResource(R.drawable.img);
Typeface typeface = Typeface.createFromAsset(getAssets(),
"font/gothic_0.TTF");
button.setTypeface(typeface);
button2.setTypeface(typeface);
button3.setTypeface(typeface);
music.setTypeface(typeface);
button.setVisibility(1);
button2.setVisibility(1);
button2.setVisibility(View.INVISIBLE);
textView.setVisibility(View.INVISIBLE);
videoView.setVisibility(View.INVISIBLE);
imageView1.setVisibility(View.INVISIBLE);
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#ee7b35")));
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
textView.setVisibility(View.VISIBLE);
button.setVisibility(View.INVISIBLE);
button2.setVisibility(View.VISIBLE);
videoView.setVisibility(View.GONE);
imageView1.setVisibility(View.VISIBLE);
new CountDownTimer(11000, 7000) {
@Override
public void onTick(long millisUntilFinished) {
customHandler.postDelayed(updateTimerThread, 1);
startTime = SystemClock.uptimeMillis();
}
@Override
public void onFinish() {
customHandler.removeCallbacks(updateTimerThread);
}
}.start();
// TODO Auto-generated method stub
}
});
button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
customHandler.removeCallbacks(updateTimerThread);
button.setVisibility(View.VISIBLE);
button2.setVisibility(View.INVISIBLE);
imageView1.setVisibility(View.GONE);
videoView.setVisibility(View.GONE);
}
});
button3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
textView.setVisibility(View.INVISIBLE);
videoView.setVisibility(View.VISIBLE);
imageView1.setVisibility(View.GONE);
button.setVisibility(View.VISIBLE);
button2.setVisibility(View.INVISIBLE);
ArrayList<Integer> songarr= new ArrayList<Integer>();
songarr.add(R.raw.funny);
Uri uri = Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.funny);
mediaController.setAnchorView(videoView);
videoView.setMediaController(mediaController);
videoView.setVideoURI(uri);
videoView.start();
}
});
videoView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// TODO Auto-generated method stub
if (flag == 0){
button.setVisibility(View.INVISIBLE);
button2.setVisibility(View.INVISIBLE);
music.setVisibility(View.INVISIBLE);
button3.setVisibility(View.INVISIBLE);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
android.widget.RelativeLayout.LayoutParams params = (android.widget.RelativeLayout.LayoutParams) videoView.getLayoutParams();
params.width = metrics.widthPixels;
params.height = metrics.heightPixels;
//params.leftMargin = 0;
videoView.setLayoutParams(params);
flag = 1;
}else{
button.setVisibility(View.VISIBLE);
button2.setVisibility(View.VISIBLE);
music.setVisibility(View.VISIBLE);
button3.setVisibility(View.VISIBLE);
DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics);
android.widget.RelativeLayout.LayoutParams params = (android.widget.RelativeLayout.LayoutParams) videoView.getLayoutParams();
params.width = (int) (200*metrics.density);
params.height = (int) (200*metrics.density);
params.leftMargin = 30;
videoView.setLayoutParams(params);
flag = 0;
}
return false;
}
});
music.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(flag == 0){
Toast.makeText(getApplicationContext(), "Playing Music", Toast.LENGTH_LONG).show();
mp.start();
flag = 1;
}
else{
Toast.makeText(getApplicationContext(), "Stop", Toast.LENGTH_LONG).show();
mp.stop();
mp.release();
flag = 0;
}
}
});
}
private Runnable updateTimerThread = new Runnable() {
int secs;
@Override
public void run() {
// TODO Auto-generated method stub
timeInMillisecond = SystemClock.uptimeMillis() - startTime;
updatedTime = timeSwapBuff + timeInMillisecond;
secs = (int) (updatedTime / 1000);
int mins = secs / 60;
secs = secs % 60;
int milliseconds = (int) (updatedTime % 10000);
textView.setText(String.format("%02d", secs));
customHandler.postDelayed(this, 1000);
switch (secs) {
case 1:
imageView1.setBackgroundResource(R.drawable.img1);
break;
case 2:
imageView1.setBackgroundResource(R.drawable.img2);
break;
case 3:
imageView1.setBackgroundResource(R.drawable.img3);
break;
case 4:
imageView1.setBackgroundResource(R.drawable.img4);
break;
case 5:
imageView1.setBackgroundResource(R.drawable.img5);
break;
case 6:
imageView1.setBackgroundResource(R.drawable.img6);
break;
case 7:
imageView1.setBackgroundResource(R.drawable.img7);
break;
case 8:
imageView1.setBackgroundResource(R.drawable.img8);
break;
case 9:
imageView1.setBackgroundResource(R.drawable.img9);
break;
case 10:
imageView1.setBackgroundResource(R.drawable.img66);
button.setVisibility(View.VISIBLE);
button2.setVisibility(View.INVISIBLE);
break;
}
}
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
// return super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
// return super.onOptionsItemSelected(item);
if (item.getItemId() == R.id.menulist)
finish();
// return true;
if (item.getItemId() == R.id.pager1) {
Intent in = new Intent(getApplicationContext(), MainActivity1.class);
startActivity(in);
}
if (item.getItemId() == R.id.image1) {
Intent in = new Intent(getApplicationContext(), Imageswipe.class);
startActivity(in);
}
return true;
}
}
这是我的xml文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/relativelayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FF944D"
tools:context=".MainActivity" >
<TextView
android:id="@+id/timerValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="14dp"
android:textColor="#ffffff"
android:text="00"
android:textSize="40sp" />
<Button
android:id="@+id/pause"
android:layout_width="50dp"
android:layout_height="200dp"
android:layout_alignParentRight="true"
android:layout_alignRight="@+id/button1"
android:layout_centerVertical="true"
android:layout_marginLeft="4dp"
android:layout_marginRight="6dp"
android:background="#ee7b35"
android:padding="20dp"
android:text="Pause"
android:textColor="#ffffff"
/>
<Button
android:id="@+id/button1"
android:layout_width="200dp"
android:layout_height="50dp"
android:layout_below="@+id/pause"
android:layout_centerHorizontal="true"
android:layout_marginBottom="5dp"
android:layout_marginTop="4dp"
android:background="#ee7b35"
android:text="Start slide show"
android:textColor="#ffffff" />
<Button
android:id="@+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_toLeftOf="@+id/timerValue"
android:background="#2B9B2B"
android:textColor="#ffffff"
android:text="Play Video" />
<Button
android:id="@+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_alignRight="@+id/button1"
android:layout_below="@+id/button1"
android:layout_toRightOf="@+id/timerValue"
android:background="#3B38FD"
android:textColor="#ffffff"
android:text="Play Audio" />
<VideoView
android:id="@+id/videoView1"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
<ImageView
android:id="@+id/imageView4"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
/>
</RelativeLayout>
答案 0 :(得分：1)
尝试使用github上的CircularImageView库。
<强> XML：
<com.mikhaellopez.circularimageview.CircularImageView
android:layout_width="250dp"
android:layout_height="250dp"
android:src="@drawable/image"
app:border_color="#EEEEEE"
app:border_width="10"
app:shadow="true" />
<强>爪哇：
CircularImageView circularImageView = (CircularImageView)findViewById(R.id.yourCircularImageView);
circularImageView.setBorderColor(getResources().getColor(R.color.GrayLight));
circularImageView.setBorderWidth(10);
circularImageView.addShadow();
答案 1 :(得分：1)
简单
xml文件中的：
只需拖动imageview并从可绘制文件夹中放入任何图像
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:src="@drawable/image" />
：
获取图像视图的所有控件。通过使用位图，我们可以将图像裁剪成圆形，并在同一图像视图中显示。不仅是圆形，我们可以使用它将它转换成任何形状，如方形或左右。
public class MainActivity extends Activity {
static ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView=(ImageView)findViewById(R.id.imageView1);
Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.image);
imageView.setImageBitmap(getCircleBitmap(bitmap));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public static Bitmap getCircleBitmap(Bitmap bitmap) {
//crop to circle
Bitmap output;
//check if its a rectangular image
if (bitmap.getWidth() > bitmap.getHeight()) {
output = Bitmap.createBitmap(bitmap.getHeight(), bitmap.getHeight(), Config.ARGB_8888);
} else {
output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getWidth(), Config.ARGB_8888);
}
Canvas canvas = new Canvas(output);
float r = 0;
if (bitmap.getWidth() > bitmap.getHeight()) {
r = bitmap.getHeight() / 2;
} else {
r = bitmap.getWidth() / 2;
}
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawCircle(r, r, r, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
}