Java 新活动上出现意外错误?
我正在练习用Android实现算法,在调试时总是遇到问题。当我按下按钮将我的数组传递给新活动以显示它时,应用程序崩溃,我很难破译错误代码。有人能告诉我如何解决这个问题吗 主要活动Java 新活动上出现意外错误?,java,android,android-activity,Java,Android,Android Activity,我正在练习用Android实现算法,在调试时总是遇到问题。当我按下按钮将我的数组传递给新活动以显示它时,应用程序崩溃,我很难破译错误代码。有人能告诉我如何解决这个问题吗 主要活动 import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
public final static String SORTING = "com.example.junkyardstar.SORTING";
int [] sortedInt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@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);
}
public void insertionSort(View view)
{
Intent intent = new Intent(this, InsertionSort.class);
Bundle mBundle = new Bundle();
EditText unsorted = (EditText) findViewById(R.id.editText);
String unsortedString = unsorted.getText().toString();
sortedInt = new int[unsortedString.length()];
for(int i = 0; i < unsortedString.length(); i++)
{
sortedInt[i] = Integer.parseInt(unsortedString.substring(i, i+1));
}
for(int i = 1; i < sortedInt.length; i++)
{
int key = sortedInt[i];
int temp = i - 1;
while(i > 0 && sortedInt[temp] > key)
{
sortedInt[temp + 1] = sortedInt[temp];
temp = temp - 1;
}
sortedInt[temp + 1] = key;
}
mBundle.putSerializable("sorted", sortedInt);
intent.putExtras(mBundle);
startActivity(intent);
}
}
Android清单
public class InsertionSort extends AppCompatActivity {
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
Bundle bundle = intent.getBundleExtra("sorted");
int [] sortedList = (int []) bundle.getSerializable("sorted");
String sortedListString = String.valueOf(sortedList);
textView.setText(sortedListString);
}
@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_insertion_sort, 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);
}
public void onClick()
{
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.junkyardstar.insertionsort" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".InsertionSort"
android:label="@string/title_activity_insertion_sort" >
</activity>
</application>
您不能通过serializable传递您的
int[]
,int
是基本类型,因此将int数组
转换为字符串数组
并传递,因为字符串
扩展了使用serializable的对象
AndroidManifest.xml的内容是什么?应该是mBundle.putIntArray(“排序”,sorted)?我试过了,但还是有同样的问题
mBundle.putIntgerArray("sorted", sortedInt);
intent.putExtras(mBundle);
startActivity(intent);
Intent intent = getIntent();
Bundle bundle = intent.getExtras("sorted");
int [] sortedList = (int []) bundle.getIntgerArray("sorted");
try{
String sortedListString = String.valueOf(sortedList);
}catch(Throwable e){
}