Java ImageView使我的android应用程序在三星Galaxy S5上崩溃
作为android开发的新手,我在这里问你一个问题。现在我正试图学习一个教程,该教程在Java ImageView使我的android应用程序在三星Galaxy S5上崩溃,java,android,imageview,galaxy,Java,Android,Imageview,Galaxy,作为android开发的新手,我在这里问你一个问题。现在我正试图学习一个教程,该教程在android Studio中教授android开发的基础知识,但我的Samsung Galaxy S5遇到了一个问题 我试图做的是从gallery导入一个图像,并将其放入ImageView中,但当我尝试启动应用程序时,会出现崩溃错误。我知道很多人都有这个问题,我下载了三星SDK,但我不知道用什么和如何解决这个问题。(对不起,这一切都是我昨天开始的,我找不到任何可以帮助我的东西…) 代码如下: 活动\u mai
android Studio
中教授android开发的基础知识,但我的Samsung Galaxy S5
遇到了一个问题
我试图做的是从gallery导入一个图像,并将其放入ImageView
中,但当我尝试启动应用程序时,会出现崩溃错误。我知道很多人都有这个问题,我下载了三星SDK,但我不知道用什么和如何解决这个问题。(对不起,这一切都是我昨天开始的,我找不到任何可以帮助我的东西…)
代码如下:
活动\u main.xml
<RelativeLayout 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"
tools:context="${packageName}.${activityClass}">
<TabHost
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/tabHost"
android:layout_alignParentTop="false">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"></TabWidget>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:id="@+id/tabCreator"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Contatto"
android:id="@+id/textView"
android:layout_gravity="center_horizontal" />
<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:id="@+id/imgContact"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:src="@drawable/no_user_logo"
android:clickable="false" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="@+id/txtName"
android:textAllCaps="false"
android:hint="Nome"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="phone"
android:ems="10"
android:id="@+id/txtNumber"
android:hint="Numero di Telefono"
android:layout_marginTop="10dp"
android:layout_below="@id/txtName"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="false" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:ems="10"
android:id="@+id/txtMail"
android:layout_marginTop="10dp"
android:hint="Email" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Aggiungi Contatto"
android:id="@+id/btnAdd"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:enabled="false"
android:layout_gravity="center_horizontal" />
</LinearLayout>
<LinearLayout
android:id="@+id/tabList"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Contatti"
android:id="@+id/textView2"
android:layout_gravity="center_horizontal" />
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/banana"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp" />
</LinearLayout>
</FrameLayout>
</LinearLayout>
</TabHost>
</RelativeLayout>
MainActivity.java
public class MainActivity extends Activity {
EditText txtName, txtPhone, txtEmail;
List<Contact> lstContacts = new ArrayList<Contact>();
ListView lstViewContact;
ImageView img = (ImageView)findViewById(R.id.imgContact);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtName = (EditText) findViewById(R.id.txtName);
txtPhone = (EditText) findViewById(R.id.txtNumber);
txtEmail = (EditText) findViewById(R.id.txtMail);
lstViewContact = (ListView)findViewById(R.id.banana);
final Button btn = (Button) findViewById(R.id.btnAdd);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
addContact(txtName.getText().toString().trim(), txtPhone.getText().toString(), txtEmail.getText().toString());
Toast.makeText(getApplicationContext(), "Banana", Toast.LENGTH_SHORT).show();
}
});
img.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Contact Image"), 1);
}
});
txtName.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
boolean goName = false, goPhone = false;
if(txtName.length() > 0) goName = txtName.getText().toString().trim().length() > 0;
if(txtPhone.length() > 0) goPhone = txtPhone.getText().toString().trim().length() > 0;
btn.setEnabled(goName && goPhone);
}
@Override
public void afterTextChanged(Editable editable) {
}
});
txtPhone.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
boolean goName = false, goPhone = false;
if(txtName.length() > 0) goName = txtName.getText().toString().trim().length() > 0;
if(txtPhone.length() > 0) goPhone = txtPhone.getText().toString().trim().length() > 0;
btn.setEnabled(goName && goPhone);
}
@Override
public void afterTextChanged(Editable editable) {
}
});
TabHost tabHost = (TabHost)findViewById(R.id.tabHost);
tabHost.setup();
TabHost.TabSpec tabSpec = tabHost.newTabSpec("creator");
tabSpec.setContent(R.id.tabCreator);
tabSpec.setIndicator("Creator");
tabHost.addTab(tabSpec);
tabSpec = tabHost.newTabSpec("list");
tabSpec.setContent(R.id.tabList);
tabSpec.setIndicator("List");
tabHost.addTab(tabSpec);
}
public void onActivityResult(int reqCode, int resCode, Intent data) {
if(resCode == RESULT_OK) {
if(reqCode == 1) img.setImageURI(data.getData());
}
}
private class lstContactsAdapter extends ArrayAdapter<Contact> {
public lstContactsAdapter() {
super(MainActivity.this, R.layout.listview_item, lstContacts);
}
@Override
public View getView(int position, View view, ViewGroup parent) {
//Se la view non esiste io la metto come listview_item all'interno della lista alla fine (non al root)
if(view == null) view = getLayoutInflater().inflate(R.layout.listview_item, parent, false);
Contact currentContact = lstContacts.get(position);
TextView name = (TextView)view.findViewById(R.id.contactName);
TextView phone = (TextView)view.findViewById(R.id.contactPhone);
TextView mail = (TextView)view.findViewById(R.id.contactMail);
name.setText(currentContact.getName());
phone.setText(currentContact.getPhone());
mail.setText(currentContact.getEmail());
return view;
}
}
private void addContact(String name, String phone, String email) {
lstContacts.add(new Contact(name, phone, email));
ArrayAdapter<Contact> adapter = new lstContactsAdapter();
lstViewContact.setAdapter(adapter);
}
}
公共类MainActivity扩展活动{
EditText txtName、txtPhone、txtMail;
List lstContacts=new ArrayList();
ListView-ListViewContact;
ImageView img=(ImageView)findViewById(R.id.imgContact);
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtName=(EditText)findViewById(R.id.txtName);
txtPhone=(EditText)findViewById(R.id.txtNumber);
txtMail=(EditText)findViewById(R.id.txtMail);
lstViewContact=(ListView)findViewById(R.id.banana);
最终按钮btn=(按钮)findViewById(R.id.btnAdd);
btn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
addContact(txtName.getText().toString().trim(),txtPhone.getText().toString(),txtmail.getText().toString());
Toast.makeText(getApplicationContext(),“Banana”,Toast.LENGTH_SHORT.show();
}
});
setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
意图=新意图();
intent.setType(“image/*”);
intent.setAction(intent.ACTION\u GET\u CONTENT);
startActivityForResult(Intent.createChooser(Intent,“选择联系人图像”),1);
}
});
addTextChangedListener(新的TextWatcher(){
@凌驾
更改前的公共无效(CharSequence CharSequence,int i,int i2,int i3){
}
@凌驾
public void onTextChanged(CharSequence CharSequence,int i,int i2,int i3){
布尔goName=false,goPhone=false;
如果(txtName.length()>0)goName=txtName.getText().toString().trim().length()>0;
如果(txtPhone.length()>0)goPhone=txtPhone.getText().toString().trim().length()>0;
btn.setEnabled(goName和goPhone);
}
@凌驾
public void PostTextChanged(可编辑){
}
});
addTextChangedListener(新的TextWatcher(){
@凌驾
更改前的公共无效(CharSequence CharSequence,int i,int i2,int i3){
}
@凌驾
public void onTextChanged(CharSequence CharSequence,int i,int i2,int i3){
布尔goName=false,goPhone=false;
如果(txtName.length()>0)goName=txtName.getText().toString().trim().length()>0;
如果(txtPhone.length()>0)goPhone=txtPhone.getText().toString().trim().length()>0;
btn.setEnabled(goName和goPhone);
}
@凌驾
public void PostTextChanged(可编辑){
}
});
TabHost TabHost=(TabHost)findviewbyd(R.id.TabHost);
tabHost.setup();
TabHost.TabSpec TabSpec=TabHost.newTabSpec(“创建者”);
tabSpec.setContent(R.id.tabCreator);
tabSpec.setIndicator(“创建者”);
tabHost.addTab(tabSpec);
tabSpec=tabHost.newTabSpec(“列表”);
tabSpec.setContent(R.id.tabList);
tabSpec.setIndicator(“列表”);
tabHost.addTab(tabSpec);
}
ActivityResult上的公共无效(输入请求代码、输入重新编码、意图数据){
如果(重新编码==结果_确定){
if(reqCode==1)img.setImageURI(data.getData());
}
}
私有类lstContactsAdapter扩展了ArrayAdapter{
公共联系人dapter(){
超级(MainActivity.this、R.layout.listview_项、lstContacts);
}
@凌驾
公共视图getView(内部位置、视图视图、视图组父视图){
//查看非esiste io la METO come列表查看所有项目的内部列表(非al root)
如果(view==null)view=GetLayoutFlater().inflate(R.layout.listview_项,父项,false);
触点电流触点=lstContacts.get(位置);
TextView name=(TextView)view.findViewById(R.id.contactName);
TextView电话=(TextView)view.findviewbyd(R.id.contactPhone);
TextView邮件=(TextView)view.findViewById(R.id.contactMail);
name.setText(currentContact.getName());
setText(currentContact.getPhone());
mail.setText(currentContact.getEmail());
返回视图;
}
}
私人void addContact(字符串名称、字符串电话、字符串电子邮件){
添加(新联系人(姓名、电话、电子邮件));
ArrayAdapter=new lstContactsAdapter();
lstViewContact.setAdapter(适配器);
}
}
我很抱歉在不知情的情况下问这个问题,但我希望你能理解并帮助我。感谢您的阅读,并为我所犯的任何语法错误表示歉意。在您的课堂上,代替这个
public void onActivityResult(int reqCode, int resCode, Intent data) {
if(resCode == RESULT_OK) {
if(reqCode == 1) img.setImageURI(data.getData());
}
}
把这个,
@Override
public void onActivityResult(int reqCode, int resCode, Intent data) {
if(resCode == RESULT_OK) {
if(reqCode == 1 && data.getData() != null)
img.setImageURI(data.getData());
}
super.onActivityResult(reqCode, resCode, data);
}
您应该始终调用super
class方法来确保您自己的默认行为。另外,@Override
注释确保将onActivityResult
作为回调调用。最后,data.getData()!=空值
确保您不会获得NPE。发布您的st