调试-优快云博客

本文介绍了Android应用程序中UI布局的实现方式，并通过具体代码展示了如何使用Toast进行简单消息提示，包括默认显示、自定义位置及带图片的Toast示例。

1，布局

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="helloworld.com.inspur.demo7.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/but"
        android:text="anniu"/>
</LinearLayout>

2，逻辑代码

package helloworld.com.inspur.demo7;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private static final String TAG="songyan";
    private Button but;
    private int count=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        but=(Button)findViewById(R.id.but);
        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int num=1;
                int result=Math.max(num,10);
                Log.v(TAG,"详细");
                int rel=init();
            }
        });


    }

    public int init()
    {
        for (int i=0;i<5;i++)
        {
            count+=i;
        }
        return count;
    }
}

（二）Toast

（1）默认

布局

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="helloworld.com.inspur.app2.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/but1"
        android:text="默认"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/but2"
        android:text="自定义位置"/>
</LinearLayout>

逻辑

package helloworld.com.inspur.app2;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Button but1;
    private Button but2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        but1=(Button)findViewById(R.id.but1);
        but2=(Button)findViewById(R.id.but2);
        but1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
              //  Toast.makeText(MainActivity.this,"default",Toast.LENGTH_LONG).show();
                Toast.makeText(getApplicationContext(),R.string.haha,Toast.LENGTH_SHORT).show();
            }
        }
        );



    }
}

（2）自定义位置

逻辑

package helloworld.com.inspur.app2;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Button but1;
    private Button but2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        but1=(Button)findViewById(R.id.but1);
        but2=(Button)findViewById(R.id.but2);
        but1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
              //  Toast.makeText(MainActivity.this,"default",Toast.LENGTH_LONG).show();
                Toast.makeText(getApplicationContext(),R.string.haha,Toast.LENGTH_SHORT).show();
            }
        }
        );
        but2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast toast= Toast.makeText(getApplicationContext(),R.string.haha,Toast.LENGTH_SHORT);
                toast.setGravity(Gravity.CENTER,200,200);
                toast.show();
            }
        });



    }
}

(3)带图片的

（4）布局

<?xml version="1.0" encoding="utf-8"?>
<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" android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="helloworld.com.inspur.app2.MainActivity">
   <Button
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:id="@+id/but"/>




</LinearLayout>

逻辑

package helloworld.com.inspur.app2;
import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity{
    private Button but;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       but=(Button)findViewById(R.id.but);
        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder= new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("hhahh");
                builder.setIcon(R.mipmap.ic_launcher);
                builder.setMessage("hahhhh");
                builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this,"aaaaaaaaaa",Toast.LENGTH_LONG).show();
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this,"bbbbbbb",Toast.LENGTH_LONG).show();
                    }
                });
                builder.create().show();
            }
        });
    }

}