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Android编程使用Intent传递图片的方法详解

2019-12-12 03:34:55
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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bitmapstartActivity(intent);

接收图片:

//接收的activityIntent intent = getIntent();if (intent != null && intent.getParcelableExtra("BITMAP") != null) {  Bitmap bitmap = (Bitmap)getIntent().getParcelableExtra("BITMAP");  mImageViewPortrait.setImageBitmap(bitmap);}

更多关于Android相关内容感兴趣的读者可查看本站专题:《Android图形与图像处理技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结

希望本文所述对大家Android程序设计有所帮助。

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