在開發app中經常會遇到打開圖庫選取圖片、手機拍照得到圖片作爲用戶的頭像。並不難,直接上代碼;
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.administrator.camerademo.MainActivity">
<ImageView
android:id="@+id/img"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center_horizontal"
android:src="@mipmap/ic_launcher" />
<Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="選取圖片" />
<Button
android:id="@+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="手機拍照" />
</LinearLayout>
package com.example.administrator.camerademo;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button btn;
private Button btn2;
private ImageView img;
public String filePath;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
//保存圖片的路徑
filePath=Environment.getExternalStorageDirectory().
getAbsolutePath()+"/a.png";
btn = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
img = (ImageView) findViewById(R.id.img);
btn.setOnClickListener(this);
btn2.setOnClickListener(this);
//讀取保存的位圖(圖片)
Bitmap bitmap1= readImg();
if(bitmap1!=null){
img.setImageBitmap(bitmap1);
}else{
return;
}
}
@Override
public void onClick(View v) {
Intent intent;
switch (v.getId()) {
case R.id.btn1:
//打開手機的圖庫;
intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, 0x1);
break;
case R.id.btn2:
intent = new Intent();
//MediaStore.ACTION_IMAGE_CAPTURE 調用系統的照相機
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 0x3);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 0x1) {
if (data != null) {
Uri uri = data.getData();
getImg(uri);
} else {
return;
}
}
if (requestCode == 0x2) {
if (data != null) {
Bundle bundle = data.getExtras();
//得到圖片
Bitmap bitmap = bundle.getParcelable("data");
//保存到圖片到本地
saveImg(bitmap);
//設置圖片
img.setImageBitmap(bitmap);
} else {
return;
}
}
if (requestCode == 0x3) {
if (data != null) {
Bundle bundle = data.getExtras();
Bitmap bitmap = bundle.getParcelable("data");
img.setImageBitmap(bitmap);
} else {
return;
}
}
}
//讀取位圖(圖片)
private Bitmap readImg() {
File mfile = new File(filePath);
Bitmap bm = null;
if (mfile.exists()) { //若該文件存在
bm = BitmapFactory.decodeFile(filePath);
}
return bm;
}
//保存圖片到本地,下次直接讀取
private void saveImg(Bitmap mBitmap) {
File f = new File(filePath);
try {
//如果文件不存在,則創建文件
if(!f.exists()){
f.createNewFile();
}
//輸出流
FileOutputStream out = new FileOutputStream(f);
/** mBitmap.compress 壓縮圖片
*
* Bitmap.CompressFormat.PNG 圖片的格式
* 100 圖片的質量(0-100)
* out 文件輸出流
*/
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
Toast.makeText(this,f.getAbsolutePath().toString(),Toast.LENGTH_SHORT).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
private void getImg(Uri uri) {
try {
InputStream inputStream = getContentResolver().openInputStream(uri);
//從輸入流中解碼位圖
// Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
//保存位圖
// img.setImageBitmap(bitmap);
cutImg(uri);
//關閉流
inputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//裁剪圖片
private void cutImg(Uri uri) {
if (uri != null) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
//true:出現裁剪的框
intent.putExtra("crop", "true");
//裁剪寬高時的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
//裁剪後的圖片的大小
intent.putExtra("outputX", 300);
intent.putExtra("outputY", 300);
intent.putExtra("return-data", true); // 返回數據
intent.putExtra("output", uri);
intent.putExtra("scale", true);
startActivityForResult(intent, 0x2);
} else {
return;
}
}
}
在AndroidManifest.xml加入以下三個權限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>