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我有一个按钮 ID 为“more_button”的按钮,单击该按钮后,我想转到“主页 Activity ”。但是当我点击按钮时,应用程序停止并给我一条消息:
应用已停止
这里是有问题的代码:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
FloatingActionButton first_button = (FloatingActionButton) findViewById(R.id.first_button);
FloatingActionButton second_button = (FloatingActionButton) findViewById(R.id.second_button);
FloatingActionButton third_button = (FloatingActionButton) findViewById(R.id.third_button);
Button more_button = (Button) findViewById(R.id.more_button);
second_button.setEnabled(false);
final ArrayList<String> contacts = getIntent().getStringArrayListExtra("CONTACTS");
more_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent gotohome = new Intent(FirstActivity.this, HomeActivity.class);
FirstActivity.this.startActivity(gotohome);
}
});
这是我想去的 HomeActivity...它具有相机和音频的各种功能 - 如果我无法访问 Home Activity 并且我的 onClickListener 似乎没有任何问题,是不是因为 Home Activity 中的代码?
import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.media.Image;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Random;
import static android.Manifest.permission.ACCESS_FINE_LOCATION;
import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
import android.support.v4.app.ActivityCompat;
import android.content.pm.PackageManager;
import android.support.v4.content.ContextCompat;
// this is the one FR
public class HomeActivity extends AppCompatActivity {
private static final int CAMERA_REQUEST = 1888;
private ImageView imageView;
Button buttonStart, buttonStop, buttonPlayLastRecordAudio,
buttonStopPlayingRecording ;
String AudioSavePathInDevice = null;
MediaRecorder mediaRecorder ;
Random random ;
String RandomAudioFileName = "ABCDEFGHIJKLMNOP";
public static final int RequestPermissionCode = 1;
MediaPlayer mediaPlayer ;
String message;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
final ArrayList<String> contacts = getIntent().getStringArrayListExtra("CONTACTSLIST");
Button location_button = (Button) this.findViewById(R.id.button5);
/* location_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendSMS("CONTACTSLIST", message);
}
}); */
location_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (checkPermissionText(Manifest.permission.SEND_SMS)) {
// TODO GET THIS INTENT RECIEVER TO WORK
//String[] contacts = getIntent().getExtras().getStringArray("CONTACTS");
//String[] contacts = new String[] {"3345", "5554", "5556"};
for(int i = 0; i < contacts.size(); i++) {
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(contacts.get(i), null, message, null, null);
}
} else {
Toast.makeText(HomeActivity.this, "Permission denied", Toast.LENGTH_SHORT).show();
}
}
});
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, new LocationListener() {
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
@Override
public void onLocationChanged(final Location location) {
}
});
Location myLocation = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
double longitude = myLocation.getLongitude();
double latitude = myLocation.getLatitude();
message += "This is my location: " + "https://www.google.co.id/maps/@" + latitude + "," + longitude;
this.imageView = (ImageView)this.findViewById(R.id.imageView1);
Button photoButton = (Button) this.findViewById(R.id.button1);
photoButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
buttonStart = (Button) findViewById(R.id.button);
buttonStop = (Button) findViewById(R.id.button2);
buttonPlayLastRecordAudio = (Button) findViewById(R.id.button3);
buttonStopPlayingRecording = (Button)findViewById(R.id.button4);
buttonStop.setEnabled(false);
buttonPlayLastRecordAudio.setEnabled(false);
buttonStopPlayingRecording.setEnabled(false);
random = new Random();
buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(checkPermission()) {
AudioSavePathInDevice =
Environment.getExternalStorageDirectory().getAbsolutePath() + "/" +
CreateRandomAudioFileName(5) + "AudioRecording.3gp";
MediaRecorderReady();
try {
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
buttonStart.setEnabled(false);
buttonStop.setEnabled(true);
Toast.makeText(HomeActivity.this, "Recording started",
Toast.LENGTH_LONG).show();
} else {
requestPermission();
}
}
});
buttonStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mediaRecorder.stop();
buttonStop.setEnabled(false);
buttonPlayLastRecordAudio.setEnabled(true);
buttonStart.setEnabled(true);
buttonStopPlayingRecording.setEnabled(false);
Toast.makeText(HomeActivity.this, "Recording Completed",
Toast.LENGTH_LONG).show();
}
});
buttonPlayLastRecordAudio.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) throws IllegalArgumentException,
SecurityException, IllegalStateException {
buttonStop.setEnabled(false);
buttonStart.setEnabled(false);
buttonStopPlayingRecording.setEnabled(true);
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(AudioSavePathInDevice);
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.start();
Toast.makeText(HomeActivity.this, "Recording Playing",
Toast.LENGTH_LONG).show();
}
});
buttonStopPlayingRecording.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
buttonStop.setEnabled(false);
buttonStart.setEnabled(true);
buttonStopPlayingRecording.setEnabled(false);
buttonPlayLastRecordAudio.setEnabled(true);
if(mediaPlayer != null){
mediaPlayer.stop();
mediaPlayer.release();
MediaRecorderReady();
}
}
});
Button button6= (Button) findViewById(R.id.button6);
button6.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.addCategory(Intent.CATEGORY_BROWSABLE);
intent.setData(Uri.parse("http://www.wix.com"));
startActivity(intent);
}});
}
private void sendSMS(String phoneNumber, String message) {
SmsManager sms = SmsManager.getDefault();
sms.sendTextMessage(phoneNumber, null, message, null, null);
}
public void MediaRecorderReady(){
mediaRecorder=new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
mediaRecorder.setOutputFile(AudioSavePathInDevice);
}
public String CreateRandomAudioFileName(int string){
StringBuilder stringBuilder = new StringBuilder( string );
int i = 0 ;
while(i < string ) {
stringBuilder.append(RandomAudioFileName.
charAt(random.nextInt(RandomAudioFileName.length())));
i++ ;
}
return stringBuilder.toString();
}
private void requestPermission() {
ActivityCompat.requestPermissions(HomeActivity.this, new
String[]{WRITE_EXTERNAL_STORAGE, RECORD_AUDIO,ACCESS_FINE_LOCATION}, RequestPermissionCode);
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case RequestPermissionCode:
if (grantResults.length> 0) {
boolean StoragePermission = grantResults[0] ==
PackageManager.PERMISSION_GRANTED;
boolean RecordPermission = grantResults[1] ==
PackageManager.PERMISSION_GRANTED;
boolean LocationPermission= grantResults[2] ==
PackageManager.PERMISSION_GRANTED;
if (StoragePermission && RecordPermission && LocationPermission) {
Toast.makeText(HomeActivity.this, "Permission Granted",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(HomeActivity.this,"Permission Denied",Toast.LENGTH_LONG).show();
}
}
break;
}
}
public boolean checkPermission() {
int result = ContextCompat.checkSelfPermission(getApplicationContext(),
WRITE_EXTERNAL_STORAGE);
int result1 = ContextCompat.checkSelfPermission(getApplicationContext(),
RECORD_AUDIO);
int result2 = ContextCompat.checkSelfPermission(getApplicationContext(),
ACCESS_FINE_LOCATION);
return result == PackageManager.PERMISSION_GRANTED &&
result1 == PackageManager.PERMISSION_GRANTED &&
result2 == PackageManager.PERMISSION_GRANTED;
}
private boolean checkPermissionText(String permission) {
int checkPermission = ContextCompat.checkSelfPermission(this, permission);
return (checkPermission == PackageManager.PERMISSION_GRANTED);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(photo);
}
}
}
最后,这是主页的 xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:id="@+id/button1"
android:layout_width="100dp"
android:layout_height="90dp"
android:text="Take Photo"
app:srcCompat="@android:drawable/ic_menu_camera"
android:layout_above="@+id/button3"
android:layout_toRightOf="@+id/imageView1"
android:layout_toEndOf="@+id/imageView1"></Button>
<ImageView android:id="@+id/imageView1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"></ImageView>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
/>
<Button
android:id="@+id/button"
android:layout_width="90dp"
android:layout_height="48dp"
android:layout_above="@+id/button3"
android:layout_marginBottom="17dp"
android:layout_toEndOf="@+id/imageView"
android:layout_toRightOf="@+id/imageView"
android:tint="@android:color/holo_red_dark"
android:drawableTop="@android:drawable/ic_btn_speak_now" />
<Button
android:id="@+id/button2"
android:layout_width="90dp"
android:layout_height="48dp"
android:text="STOP"
android:layout_alignTop="@+id/button"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
android:id="@+id/button3"
android:layout_width="90dp"
android:layout_height="48dp"
android:layout_alignLeft="@+id/button"
android:layout_alignParentBottom="true"
android:layout_alignStart="@+id/button"
android:layout_alignTop="@+id/button4"
android:drawableTop="@android:drawable/ic_media_play"
android:stateListAnimator="@null" />
<Button
android:id="@+id/button4"
android:layout_width="90dp"
android:layout_height="48dp"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:drawableTop="@android:drawable/ic_media_pause" />
<Button
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send my Location"
android:layout_alignBaseline="@+id/button6"
android:layout_alignBottom="@+id/button6"
android:layout_toRightOf="@+id/imageView1"
android:layout_toEndOf="@+id/imageView1" />
<Button
android:id="@+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/imageView"
android:layout_marginEnd="27dp"
android:layout_marginRight="27dp"
android:layout_marginTop="19dp"
android:text="resources" />
</RelativeLayout>
和(完整)崩溃日志:
04-10 20:33:31.533 941-941/com.example.android.vigilant E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android.vigilant, PID: 941
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.vigilant/com.example.android.vigilant.HomeActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.android.vigilant.HomeActivity.onCreate(HomeActivity.java:134)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
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