android，点击"确认"，就崩溃了

[YXTS122]

public class MainActivity extends Activity implements OnClickListener {
    EditText editText;
    Button bt;
    TextView textView,textView1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText=(EditText)findViewById(R.id.edittext);
        bt=(Button)findViewById(R.id.button);
        textView=(TextView)findViewById(R.id.tv1);
        textView1=(TextView)findViewById(R.id.tv2);
        bt.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button:
        	
        	String str=editText.getText().toString();
        	textView.setText(str+"以内的质数有:");
        	textView1.setText("2,3");
            int n=Integer.parseInt(str);
        	int i=5;
        	int j=2;
        	while(i<=n)
        	{
        		while(j<i)
        		{
        			j=2;
        			if(i%j==0)
        				break;
        			if(i-1==j)
        				textView1.append(","+i);
        			j++;
        		}
        		i++;
        	}
        	
        	break;
       default:break;
        }
    }
}        	
  

<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"
    tools:context="com.example.prime.MainActivity"
    android:orientation="vertical" >
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >
        <TextView
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="输入一个数:" />
        <EditText 
            android:id="@+id/edittext"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <Button 
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="确认" />
    </LinearLayout>

    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>
  

[YXTS122]

程序死循环，并不是崩溃，改为:

public class MainActivity extends Activity implements OnClickListener {
    EditText editText;
    Button bt;
    TextView textView,textView1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText=(EditText)findViewById(R.id.edittext);
        bt=(Button)findViewById(R.id.button);
        textView=(TextView)findViewById(R.id.tv1);
        textView1=(TextView)findViewById(R.id.tv2);
        bt.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button:
             
            String str=editText.getText().toString();
            textView.setText(str+"以内的质数有:");
            textView1.setText("2,3");
            try{
            int n=Integer.parseInt(str);
            int i=5;
            int j;
            while(i<=n)
            {
            	j=2;
                while(j<i)
                {
                    if(i%j==0)
                        break;
                    if(i-1==j)
                        textView1.append(","+i);
                    j++;
                }
                i++;
            }
            }
            catch (Exception e)
            {
            	textView1.setText(e.toString());
            }
             
            break;
       default:break;
        }
    }
}