废话不多说了，直接给大家贴代码了。

package com.only.android.app; import java.io.File; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.os.SystemClock; import android.provider.MediaStore; import android.view.View; import android.widget.Button; import android.widget.ImageView; import com.only.android.R; public class CopyOfImageScaleActivity extends Activity implements View.OnClickListener { /** Called when the activity is first created. */ private Button selectImageBtn; private ImageView imageView; private File sdcardTempFile; private AlertDialog dialog; private int crop = 180; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.imagescale); selectImageBtn = (Button) findViewById(R.id.selectImageBtn); imageView = (ImageView) findViewById(R.id.imageView); selectImageBtn.setOnClickListener(this); sdcardTempFile = new File("/mnt/sdcard/", "tmp_pic_" + SystemClock.currentThreadTimeMillis() + ".jpg"); } @Override public void onClick(View v) { if (v == selectImageBtn) { if (dialog == null) { dialog = new AlertDialog.Builder(this).setItems(new String[] { "相机", "相册" }, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (which == 0) { Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); intent.putExtra("output", Uri.fromFile(sdcardTempFile)); intent.putExtra("crop", "true"); intent.putExtra("aspectX", 1);// 裁剪框比例 intent.putExtra("aspectY", 1); intent.putExtra("outputX", crop);// 输出图片大小 intent.putExtra("outputY", crop); startActivityForResult(intent, 101); } else { Intent intent = new Intent("android.intent.action.PICK"); intent.setDataAndType(MediaStore.Images.Media.INTERNAL_CONTENT_URI, "image/*"); intent.putExtra("output", Uri.fromFile(sdcardTempFile)); intent.putExtra("crop", "true"); intent.putExtra("aspectX", 1);// 裁剪框比例 intent.putExtra("aspectY", 1); intent.putExtra("outputX", crop);// 输出图片大小 intent.putExtra("outputY", crop); startActivityForResult(intent, 100); } } }).create(); } if (!dialog.isShowing()) { dialog.show(); } } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent intent) { if (resultCode == RESULT_OK) { Bitmap bmp = BitmapFactory.decodeFile(sdcardTempFile.getAbsolutePath()); imageView.setImageBitmap(bmp); } } }

以上代码很简单，相信大家都可以看的懂吧，欲了解更多信息请持续关注本站，谢谢。