Question

我最近创建了一个应用程序，当用户点击＆＃34;拍照＆＃34;屏幕上的按钮应用程序将使用Android OS的默认本机应用程序捕获图像。当我在Android Studio中的AVD模拟器上运行应用程序时，该应用程序将启动，但是当我点击该按钮时，应用程序崩溃时出现一个弹出对话框，说明＆＃34;不幸的是，该应用程序已停止工作。＆＃34;

我已经咨询过Android开发者网站文档以及各种网站，但仍然没有任何改进。

请告诉我为什么会这样。以下是该应用的代码：

AndroidManifest.xml代码

<?xml version="1.0" encoding="utf-8"?>
 <manifest
    package="com.example.the_joker.simplephoto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <uses-permission android:name="android.permission.CAMERA"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity.java代码

package com.example.the_joker.simplephoto;

import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {
    private static final int CAMERA_REQUEST=123;
    private ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar=(Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show();
            }
        });

        imageView=(ImageView)findViewById(R.id.imageView1);
        Button photoButton=(Button)findViewById(R.id.button1);

        photoButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view){
                Intent cameraIntent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(cameraIntent, CAMERA_REQUEST);
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
            Bitmap photo=(Bitmap)data.getExtras().get("data");
            imageView.setImageBitmap(photo);
        }
    }
}

content_main.xml的代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.example.the_joker.simplephoto.MainActivity"
    tools:showIn="@layout/activity_main">

    <Button android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Take picture"/>

    <ImageView android:id="@+id/imageView1"
               android:layout_height="wrap_content"
               android:layout_width="wrap_content"
               android:layout_marginTop="200dp"
               android:layout_marginLeft="50dp"/>
</LinearLayout>

点击按钮时的logcat异常

08-01 20:27:37.862 3977-3977/com.example.the_joker.simplephoto 
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.the_joker.simplephoto, PID: 3977
java.lang.SecurityException: Permission Denial: starting Intent { 
act=android.media.action.IMAGE_CAPTURE cmp=com.android.camera/.Camera } 
from ProcessRecord{43c5315 3977:com.example.the_joker.simplephoto/u0a76} 
(pid=3977, uid=10076) with revoked permission android.permission.CAMERA
at android.os.Parcel.readException(Parcel.java:1599)
at android.os.Parcel.readException(Parcel.java:1552)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:2658)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1507)
at android.app.Activity.startActivityForResult(Activity.java:3917)
at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:75)
at android.app.Activity.startActivityForResult(Activity.java:3877)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:871)
at com.example.the_joker.simplephoto.MainActivity$2.onClick(MainActivity.java:43)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

错误的符号或包名中不允许，但这只是猜测。

Answer 2

替换它，
<uses-permission android:name="android.permission.CAMERA"/>
与此，
<uses-feature android:name="android.hardware.camera" android:required="true" />

应用程序在Android模拟器中访问本机相机应用程序时无法正常工

2 个答案: