android 传递图片,Android编程使用Intent传递图片的方法详解

本文实例讲述了Android编程使用Intent传递图片的方法。分享给大家供大家参考，具体如下：

基本思路是先把bitmap转化为byte数组，用Intent传递数组，在将数组转化为bitmap

bitmap转化为byte数组的方法：

private byte[] Bitmap2Bytes(Bitmap bm){

ByteArrayOutputStream baos = new ByteArrayOutputStream();

bm.compress(Bitmap.CompressFormat.PNG, 100, baos);

return baos.toByteArray();

}

byte数组转化为bitmap方法：

byte buff[]=mIntent.getByteArrayExtra("image");

bitmap = BitmapFactory.decodeByteArray(buff, 0, buff.length);

程序实例：

第一个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();

}

}

第二个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);

}

}

发送图片：

Intent intent = new Intent(ChangePortraitActivity.this , UserProfileActivity.class);

mImageView.setDrawingCacheEnabled(Boolean.TRUE);

intent.putExtra("BITMAP", mImageView.getDrawingCache()); //这里可以放一个bitmap

startActivity(intent);

接收图片：

//接收的activity

Intent intent = getIntent();

if (intent != null && intent.getParcelableExtra("BITMAP") != null) {

Bitmap bitmap = (Bitmap)getIntent().getParcelableExtra("BITMAP");

mImageViewPortrait.setImageBitmap(bitmap);

}

希望本文所述对大家Android程序设计有所帮助。