tv忘记赋值了。。可是,还是不能运行,求解,谢谢
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如下:
package app.example.test12_16;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;public class MainActivity extends Activity {
private TextView tv;
private String str1;
private String str2;
private int flag = 0;
private Button[] temp;
private Button buttonJia, buttonJian, buttonCheng, buttonChu, buttonC,
buttonDengyu;
private int result0, result1, result;
private int button[] = { R.id.Button00, R.id.Button01, R.id.Button02,
R.id.Button03, R.id.Button04, R.id.Button05, R.id.Button06,
R.id.Button07, R.id.Button08, R.id.Button09 }; @Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化控件
temp = new Button[button.length];
buttonC = (Button) findViewById(R.id.ButtonC);
buttonDengyu = (Button) findViewById(R.id.ButtonDengyu);
buttonJia = (Button) findViewById(R.id.jia);
buttonJian = (Button) findViewById(R.id.jian);
buttonCheng = (Button) findViewById(R.id.cheng);
buttonChu = (Button) findViewById(R.id.chu);
tv = (TextView) findViewById(R.id.tv);
for (int i = 0; i < button.length; i++) {
temp[i] = (Button) findViewById(button[i]);
temp[i].setOnClickListener(new OnClickListener() { @Override
public void onClick(View view) {
str1 = tv.getText().toString().trim();
str1 = str1 + String.valueOf(((Button) view).getText());
tv.setText(str1);
} });
}
// 清空按钮的单击事件监听器
buttonC.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
str1 = "";
str2 = "";
tv.setText(str1);
flag = 0;
}
}); buttonListener(buttonJia, 1);
buttonListener(buttonJian, 2);
buttonListener(buttonCheng, 3);
buttonListener(buttonChu, 4);
buttonDengyu.setOnClickListener(new OnClickListener() { @Override
public void onClick(View view) {
result1 = Integer.parseInt(str1);
if (flag == 1) { result = result0 + result1;
System.out.println(result0 + ":" + result1); } else if (flag == 2) { result = result0 - result1; } else if (flag == 3) { result = result0 * result1; } else if (flag == 4) { result = (int) result0 / result1; }
String str = (result + "").trim();
tv.setText(str);
}
});
} public void buttonListener(Button button, final int id) {
button.setOnClickListener(new OnClickListener() { @Override
public void onClick(View view) {
String str = tv.getText().toString().trim();
result0 = Integer.parseInt(str);
tv.setText("");
flag = id;
}
});
}
}