Google Android SDK开发范例大全——示例代码

package irdc.ex03_16; import irdc.ex03_16.R; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class EX03_16 extends Activity { /** Called when the activity is first created. */ public Button mButton2; public Button mButton3; public Button mButton4; public Button mButton5; public EditText mEditText1; public EditText mEditText2; public TextView mTextView2; public TextView mTextView4; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mTextView2 = (TextView) findViewById(R.id.mTextView2); mTextView4 = (TextView) findViewById(R.id.mTextView4); mButton2 = (Button) findViewById(R.id.mButton2); mButton3 = (Button) findViewById(R.id.mButton3); mButton4 = (Button) findViewById(R.id.mButton4); mButton5 = (Button) findViewById(R.id.mButton5); mEditText1 = (EditText) findViewById(R.id.mText1); mEditText2 = (EditText) findViewById(R.id.mText2); mButton2.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { mTextView2.setText("+"); String strRet = Integer.toString( Integer.parseInt(mEditText1. getText().toString())+ Integer.parseInt (mEditText2.getText().toString()) ); mTextView4.setText(strRet); } }); mButton3.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { mTextView2.setText("-"); String strRet = Integer.toString( Integer.parseInt(mEditText1. getText().toString())- Integer.parseInt (mEditText2.getText().toString()) ); mTextView4.setText(strRet); } }); mButton4.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { mTextView2.setText("*"); String strRet = Integer.toString( Integer.parseInt(mEditText1. getText().toString())* Integer.parseInt (mEditText2.getText().toString()) ); mTextView4.setText(strRet); } }); mButton5.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { mTextView2.setText("/"); String strRet = Integer.toString( Integer.parseInt(mEditText1. getText().toString())/ Integer.parseInt (mEditText2.getText().toString()) ); mTextView4.setText(strRet); } }); } }