图记 2016.1.7 获取本地图片、Bitmap转image

              这几天完成的内容有：

              1.“添加图片”按钮

              2.添加图片功能

              遇到的问题：

              我想要将添加图片按钮放在右下角，所以采用了相对布局，但是问题随之二来，因为将导航栏设置成了半透明，所以图片放到右下角之后，半透明的导航栏会把图片挡住，最后采取的办法是把图片高度变大，导航栏挡住多处的部分，也算是勉强实现要求了，但是对于一些没有虚拟导航栏的手机，按钮距离底部的间隔会显得略大，但是目前技术实在想不出更好的办法了

　　

打开图片

　　在Activity Action里面有一个“ACTION_GET_CONTENT”字符串常量，该常量让用户选择特定类型的数据，并返回该数据的URI.我们利用该常量，然后设置类型为“image/*”，就可获得android手机内的所有image。然后再通过startActivityForResult让我们选择的image返回到Activity中去

　　AddPicActivity.java

package cn.lixyz.tuji;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
import cn.lixyz.tuji.Util.GetDate;
import cn.lixyz.tuji.sqlite.MySQLiteOpenHelper;

/**
 * 添加图片类 选择图片之后，先判断用户是否安装SD卡，如果安装，则在SD卡中新建一个cn.lixyz.tuji目录，将选择的图片复制到目录中
 * 
 * @author LGB
 *
 */

public class AddPicActivity extends Activity implements View.OnClickListener {

    private ImageView iv_select_img;
    private EditText et_image_name, et_image_tag, et_image_remark;
    private Button bt_submit;
    private Bitmap bitmap;
    private File sdPath;
    private String fileName = "TUJIE" + new Date().getTime();
    private FileOutputStream fos;
    private MySQLiteOpenHelper msoh;
    private SQLiteDatabase database;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_addpic);

        initView();

    }

    private void initView() {
        iv_select_img = (ImageView) findViewById(R.id.iv_select_img);
        et_image_name = (EditText) findViewById(R.id.et_image_name);
        et_image_tag = (EditText) findViewById(R.id.et_image_tag);
        et_image_remark = (EditText) findViewById(R.id.et_image_remark);
        bt_submit = (Button) findViewById(R.id.bt_submit);
        iv_select_img.setOnClickListener(this);
        bt_submit.setOnClickListener(this);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            Uri uri = data.getData();
            ContentResolver cr = this.getContentResolver();
            try {
                bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
                long i = new Date().getTime();
                copyPicToSDCard(bitmap);
                Log.d("TTTT", "共耗时：" + (new Date().getTime() - i));
                iv_select_img.setImageBitmap(bitmap);
            } catch (FileNotFoundException e) {
                Log.e("Exception", e.getMessage(), e);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.iv_select_img:
            Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(intent, 1);

            break;
        case R.id.bt_submit:
            String picName = et_image_name.getText().toString().trim();
            String picTag = et_image_tag.getText().toString().trim();
            String picRemark = et_image_remark.getText().toString().trim();
            msoh = new MySQLiteOpenHelper(AddPicActivity.this, "TujiData", null, 1);
            database = msoh.getWritableDatabase();
            ContentValues cv = new ContentValues();
            cv.put("picName", picName);
            cv.put("picTag", picTag);
            cv.put("picRemark", picRemark);
            cv.put("fileName", fileName);
            cv.put("date", new GetDate().getDate());
            database.insert("pics", null, cv);
            database.close();

            break;
        }
    }

    private void copyPicToSDCard(Bitmap bm) throws IOException {
        if (Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
            /* 得到SD卡得路径 */
            sdPath = Environment.getExternalStorageDirectory();
            try {
                File dir = new File(sdPath + "/cn.lixyz.TuJi");

                fos = new FileOutputStream(new File(dir + "/" + fileName + ".png"));
                if (!dir.exists()) {
                    dir.mkdir();
                    bm.compress(Bitmap.CompressFormat.PNG, 100, fos);
                } else {
                    bm.compress(Bitmap.CompressFormat.PNG, 100, fos);
                }
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {
                fos.flush();
                fos.close();
            }
        } else {
            Toast.makeText(AddPicActivity.this, "未检测到您的SD卡，长时间使用本软件，会造成系统空间减少", Toast.LENGTH_SHORT).show();
        }
    }
}