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本文實例講述了Android編程使用Intent傳遞圖片的方法。分享給大家供大家參考,具體如下:
基本思路是先把bitmap轉化為byte數組,用Intent傳遞數組,在將數組轉化為bitmap
bitmap轉化為byte數組的方法:
private byte[] Bitmap2Bytes(Bitmap bm){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); }
byte數組轉化為bitmap方法:
byte buff[]=mIntent.getByteArrayExtra("image"); bitmap = BitmapFactory.decodeByteArray(buff, 0, buff.length);
程序實例:
第一個activity:
import java.io.ByteArrayOutputStream; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class SendImageActivity extends Activity implements OnClickListener { /** Called when the activity is first created. */ private Bitmap bitmap; byte buff[] = new byte[125*250]; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ImageView mImageView = (ImageView) findViewById(R.id.image); Button bt1 = (Button) findViewById(R.id.bt1); bitmap =BitmapFactory.decodeResource(getResources(), R.drawable.option24); buff = Bitmap2Bytes(bitmap); BitmapDrawable mBitmapDrawable = new BitmapDrawable(bitmap); mImageView.setBackgroundDrawable(mBitmapDrawable); bt1.setOnClickListener(this); } @Override public void onClick(View arg0) { // TODO Auto-generated method stub Intent mIntent = new Intent(); mIntent.putExtra("image", buff); mIntent.setClass(this, activity2.class); startActivity(mIntent); } private byte[] Bitmap2Bytes(Bitmap bm){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } }
第二個activity:
import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.widget.Button; import android.widget.ImageView; public class activity2 extends Activity { private Bitmap bitmap; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout2); ImageView mImageView = (ImageView) findViewById(R.id.image2); Intent mIntent = getIntent(); byte buff[]=mIntent.getByteArrayExtra("image"); bitmap = BitmapFactory.decodeByteArray(buff, 0, buff.length); BitmapDrawable mBitmapDrawable = new BitmapDrawable(bitmap); mImageView.setBackgroundDrawable(mBitmapDrawable); } }
發送圖片:
Intent intent = new Intent(ChangePortraitActivity.this , UserProfileActivity.class); mImageView.setDrawingCacheEnabled(Boolean.TRUE); intent.putExtra("BITMAP", mImageView.getDrawingCache()); //這里可以放一個bitmap startActivity(intent);
接收圖片:
//接收的activity Intent intent = getIntent(); if (intent != null && intent.getParcelableExtra("BITMAP") != null) { Bitmap bitmap = (Bitmap)getIntent().getParcelableExtra("BITMAP"); mImageViewPortrait.setImageBitmap(bitmap); }
更多關于Android相關內容感興趣的讀者可查看本站專題:《Android圖形與圖像處理技巧總結》、《Android開發入門與進階教程》、《Android調試技巧與常見問題解決方法匯總》、《Android基本組件用法總結》、《Android視圖View技巧總結》、《Android布局layout技巧總結》及《Android控件用法總結》
希望本文所述對大家Android程序設計有所幫助。
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